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/***************************************************************************
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section_list.c - description
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-------------------
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Copyright : (C) 2004-2025 by Leaflet
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Email : leaflet@leafok.com
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#define _GNU_SOURCE
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#include "section_list.h"
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#include "log.h"
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#include "trie_dict.h"
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#include <stdio.h>
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#include <string.h>
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#include <signal.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <sys/param.h>
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#include <sys/sem.h>
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#include <sys/shm.h>
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#include <sys/ipc.h>
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#ifdef _SEM_SEMUN_UNDEFINED
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union semun
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{
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int val; /* Value for SETVAL */
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struct semid_ds *buf; /* Buffer for IPC_STAT, IPC_SET */
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unsigned short *array; /* Array for GETALL, SETALL */
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struct seminfo *__buf; /* Buffer for IPC_INFO
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(Linux-specific) */
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};
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#endif // #ifdef _SEM_SEMUN_UNDEFINED
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#define ARTICLE_BLOCK_PER_SHM 400 // sizeof(ARTICLE_BLOCK) * ARTICLE_BLOCK_PER_SHM is the size of each shm segment to allocate
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#define ARTICLE_BLOCK_SHM_COUNT_LIMIT 256 // limited by length (8-bit) of proj_id in ftok(path, proj_id)
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#define ARTICLE_BLOCK_PER_POOL (ARTICLE_BLOCK_PER_SHM * ARTICLE_BLOCK_SHM_COUNT_LIMIT)
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#define CALCULATE_PAGE_THRESHOLD 100 // Adjust to tune performance of move topic
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#define SID_STR_LEN 5 // 32-bit + NULL
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struct article_block_t
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{
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ARTICLE articles[ARTICLE_PER_BLOCK];
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int32_t article_count;
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struct article_block_t *p_next_block;
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};
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typedef struct article_block_t ARTICLE_BLOCK;
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struct article_block_shm_t
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{
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int shmid;
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void *p_shm;
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};
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typedef struct article_block_shm_t ARTICLE_BLOCK_SHM;
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struct article_block_pool_t
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{
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ARTICLE_BLOCK_SHM shm_pool[ARTICLE_BLOCK_SHM_COUNT_LIMIT];
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int shm_count;
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ARTICLE_BLOCK *p_block_free_list;
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ARTICLE_BLOCK *p_block[ARTICLE_BLOCK_PER_POOL];
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int32_t block_count;
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};
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typedef struct article_block_pool_t ARTICLE_BLOCK_POOL;
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static ARTICLE_BLOCK_POOL *p_article_block_pool = NULL;
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static int section_list_pool_shmid;
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static int section_list_pool_semid;
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static SECTION_LIST *p_section_list_pool = NULL;
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static int section_list_count = 0;
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static TRIE_NODE *p_trie_dict_section_by_name = NULL;
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static TRIE_NODE *p_trie_dict_section_by_sid = NULL;
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int article_block_init(const char *filename, int block_count)
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{
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int shmid;
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int proj_id;
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key_t key;
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size_t size;
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void *p_shm;
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int i;
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int block_count_in_shm;
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ARTICLE_BLOCK *p_block_in_shm;
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ARTICLE_BLOCK **pp_block_next;
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if (p_article_block_pool != NULL)
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{
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log_error("article_block_pool already initialized\n");
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return -1;
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}
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if (block_count > ARTICLE_BLOCK_PER_POOL)
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{
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log_error("article_block_count exceed limit %d\n", ARTICLE_BLOCK_PER_POOL);
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return -2;
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}
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p_article_block_pool = calloc(1, sizeof(ARTICLE_BLOCK_POOL));
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if (p_article_block_pool == NULL)
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{
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log_error("calloc(ARTICLE_BLOCK_POOL) OOM\n");
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return -2;
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}
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// Allocate shared memory
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p_article_block_pool->shm_count = 0;
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pp_block_next = &(p_article_block_pool->p_block_free_list);
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while (block_count > 0)
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{
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block_count_in_shm = MIN(block_count, ARTICLE_BLOCK_PER_SHM);
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block_count -= block_count_in_shm;
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proj_id = getpid() + p_article_block_pool->shm_count;
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key = ftok(filename, proj_id);
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if (key == -1)
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{
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log_error("ftok(%s, %d) error (%d)\n", filename, proj_id, errno);
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article_block_cleanup();
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return -3;
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}
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size = sizeof(shmid) + sizeof(ARTICLE_BLOCK) * (size_t)block_count_in_shm;
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shmid = shmget(key, size, IPC_CREAT | IPC_EXCL | 0600);
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if (shmid == -1)
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{
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log_error("shmget(shm_index = %d, size = %d) error (%d)\n", p_article_block_pool->shm_count, size, errno);
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article_block_cleanup();
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return -3;
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}
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p_shm = shmat(shmid, NULL, 0);
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if (p_shm == (void *)-1)
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{
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log_error("shmat(shmid = %d) error (%d)\n", shmid, errno);
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article_block_cleanup();
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return -3;
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}
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(p_article_block_pool->shm_pool + p_article_block_pool->shm_count)->shmid = shmid;
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(p_article_block_pool->shm_pool + p_article_block_pool->shm_count)->p_shm = p_shm;
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p_article_block_pool->shm_count++;
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p_block_in_shm = p_shm;
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*pp_block_next = p_block_in_shm;
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for (i = 0; i < block_count_in_shm; i++)
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{
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if (i < block_count_in_shm - 1)
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{
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(p_block_in_shm + i)->p_next_block = (p_block_in_shm + i + 1);
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}
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else
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{
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(p_block_in_shm + i)->p_next_block = NULL;
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pp_block_next = &((p_block_in_shm + i)->p_next_block);
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}
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}
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}
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p_article_block_pool->block_count = 0;
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return 0;
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}
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void article_block_cleanup(void)
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{
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if (p_article_block_pool != NULL)
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{
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for (int i = 0; i < p_article_block_pool->shm_count; i++)
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{
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if (shmdt((p_article_block_pool->shm_pool + i)->p_shm) == -1)
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{
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log_error("shmdt(shmid = %d) error (%d)\n", (p_article_block_pool->shm_pool + i)->shmid, errno);
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}
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if (shmctl((p_article_block_pool->shm_pool + i)->shmid, IPC_RMID, NULL) == -1)
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{
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log_error("shmctl(shmid = %d, IPC_RMID) error (%d)\n", (p_article_block_pool->shm_pool + i)->shmid, errno);
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}
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}
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free(p_article_block_pool);
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p_article_block_pool = NULL;
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}
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}
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inline static ARTICLE_BLOCK *pop_free_article_block(void)
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{
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ARTICLE_BLOCK *p_block = NULL;
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if (p_article_block_pool->p_block_free_list != NULL)
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{
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p_block = p_article_block_pool->p_block_free_list;
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p_article_block_pool->p_block_free_list = p_block->p_next_block;
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p_block->p_next_block = NULL;
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p_block->article_count = 0;
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}
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return p_block;
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}
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inline static void push_free_article_block(ARTICLE_BLOCK *p_block)
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{
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p_block->p_next_block = p_article_block_pool->p_block_free_list;
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p_article_block_pool->p_block_free_list = p_block;
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}
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int article_block_reset(void)
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{
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ARTICLE_BLOCK *p_block;
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if (p_article_block_pool == NULL)
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{
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log_error("article_block_pool not initialized\n");
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return -1;
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}
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while (p_article_block_pool->block_count > 0)
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{
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p_article_block_pool->block_count--;
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p_block = p_article_block_pool->p_block[p_article_block_pool->block_count];
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push_free_article_block(p_block);
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}
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return 0;
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}
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ARTICLE *article_block_find_by_aid(int32_t aid)
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{
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ARTICLE_BLOCK *p_block;
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int left;
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int right;
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int mid;
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if (p_article_block_pool == NULL)
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{
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log_error("article_block_pool not initialized\n");
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return NULL;
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}
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if (p_article_block_pool->block_count == 0) // empty
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{
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return NULL;
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}
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left = 0;
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right = p_article_block_pool->block_count;
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// aid in the range [ head aid of blocks[left], tail aid of blocks[right - 1] ]
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while (left < right - 1)
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{
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// get block offset no less than mid value of left and right block offsets
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mid = (left + right) / 2 + (right - left) % 2;
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if (mid >= p_article_block_pool->block_count)
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{
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log_error("block(mid = %d) is out of boundary\n", mid);
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return NULL;
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}
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if (aid < p_article_block_pool->p_block[mid]->articles[0].aid)
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{
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right = mid;
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}
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else
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{
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left = mid;
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}
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}
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p_block = p_article_block_pool->p_block[left];
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left = 0;
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right = p_block->article_count - 1;
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// aid in the range [ aid of articles[left], aid of articles[right] ]
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while (left < right)
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{
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mid = (left + right) / 2;
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if (aid <= p_block->articles[mid].aid)
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{
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right = mid;
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}
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else
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{
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left = mid + 1;
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}
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}
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return (p_block->articles + left);
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}
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ARTICLE *article_block_find_by_index(int index)
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{
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ARTICLE_BLOCK *p_block;
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if (p_article_block_pool == NULL)
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{
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log_error("article_block_pool not initialized\n");
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return NULL;
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}
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if (index < 0 || index / ARTICLE_PER_BLOCK >= p_article_block_pool->block_count)
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{
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log_error("article_block_find_by_index(%d) is out of boundary of block [0, %d)\n", index, p_article_block_pool->block_count);
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return NULL;
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}
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p_block = p_article_block_pool->p_block[index / ARTICLE_PER_BLOCK];
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if (index % ARTICLE_PER_BLOCK >= p_block->article_count)
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{
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log_error("article_block_find_by_index(%d) is out of boundary of article [0, %d)\n", index, p_block->article_count);
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return NULL;
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}
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return (p_block->articles + (index % ARTICLE_PER_BLOCK));
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}
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extern int section_list_pool_init(const char *filename)
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{
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int semid;
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int shmid;
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int proj_id;
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key_t key;
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size_t size;
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void *p_shm;
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union semun arg;
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int i;
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if (p_section_list_pool == NULL || p_trie_dict_section_by_name == NULL || p_trie_dict_section_by_sid == NULL)
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{
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section_list_pool_cleanup();
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}
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p_section_list_pool = calloc(BBS_max_section, sizeof(SECTION_LIST));
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if (p_section_list_pool == NULL)
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{
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log_error("calloc(%d SECTION_LIST) OOM\n", BBS_max_section);
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return -1;
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}
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proj_id = (int)(time(NULL) % getpid());
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key = ftok(filename, proj_id);
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if (key == -1)
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{
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log_error("ftok(%s, %d) error (%d)\n", filename, proj_id, errno);
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return -3;
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}
|
| 363 |
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size = 2 * (BBS_max_section + 1); // r_sem and w_sem per section, the last pair for all sections
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semid = semget(key, (int)size, IPC_CREAT | IPC_EXCL | 0600);
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| 366 |
if (semid == -1)
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{
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log_error("semget(section_list_pool_sem, size = %d) error (%d)\n", size, errno);
|
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return -3;
|
| 370 |
}
|
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| 372 |
// Initialize sem value to 0
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| 373 |
arg.val = 0;
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for (i = 0; i < size; i++)
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{
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| 376 |
if (semctl(semid, i, SETVAL, arg) == -1)
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{
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log_error("semctl(section_list_pool_sem, SETVAL) error (%d)\n", errno);
|
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return -3;
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| 380 |
}
|
| 381 |
}
|
| 382 |
|
| 383 |
section_list_pool_semid = semid;
|
| 384 |
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size = sizeof(shmid) + sizeof(SECTION_LIST) * BBS_max_section;
|
| 386 |
shmid = shmget(key, size, IPC_CREAT | IPC_EXCL | 0600);
|
| 387 |
if (shmid == -1)
|
| 388 |
{
|
| 389 |
log_error("shmget(section_list_pool_shm, size = %d) error (%d)\n", size, errno);
|
| 390 |
return -3;
|
| 391 |
}
|
| 392 |
p_shm = shmat(shmid, NULL, 0);
|
| 393 |
if (p_shm == (void *)-1)
|
| 394 |
{
|
| 395 |
log_error("shmat(shmid = %d) error (%d)\n", shmid, errno);
|
| 396 |
return -3;
|
| 397 |
}
|
| 398 |
|
| 399 |
section_list_pool_shmid = shmid;
|
| 400 |
p_section_list_pool = p_shm;
|
| 401 |
section_list_count = 0;
|
| 402 |
|
| 403 |
p_trie_dict_section_by_name = trie_dict_create();
|
| 404 |
if (p_trie_dict_section_by_name == NULL)
|
| 405 |
{
|
| 406 |
log_error("trie_dict_create() OOM\n", BBS_max_section);
|
| 407 |
return -2;
|
| 408 |
}
|
| 409 |
|
| 410 |
p_trie_dict_section_by_sid = trie_dict_create();
|
| 411 |
if (p_trie_dict_section_by_sid == NULL)
|
| 412 |
{
|
| 413 |
log_error("trie_dict_create() OOM\n", BBS_max_section);
|
| 414 |
return -2;
|
| 415 |
}
|
| 416 |
|
| 417 |
return 0;
|
| 418 |
}
|
| 419 |
|
| 420 |
inline static void sid_to_str(int32_t sid, char *p_sid_str)
|
| 421 |
{
|
| 422 |
uint32_t u_sid;
|
| 423 |
int i;
|
| 424 |
|
| 425 |
u_sid = (uint32_t)sid;
|
| 426 |
for (i = 0; i < SID_STR_LEN - 1; i++)
|
| 427 |
{
|
| 428 |
p_sid_str[i] = (char)(u_sid % 255 + 1);
|
| 429 |
u_sid /= 255;
|
| 430 |
}
|
| 431 |
p_sid_str[i] = '\0';
|
| 432 |
}
|
| 433 |
|
| 434 |
SECTION_LIST *section_list_create(int32_t sid, const char *sname, const char *stitle, const char *master_name)
|
| 435 |
{
|
| 436 |
SECTION_LIST *p_section;
|
| 437 |
char sid_str[SID_STR_LEN];
|
| 438 |
|
| 439 |
if (p_section_list_pool == NULL || p_trie_dict_section_by_name == NULL || p_trie_dict_section_by_sid == NULL)
|
| 440 |
{
|
| 441 |
log_error("session_list_pool not initialized\n");
|
| 442 |
return NULL;
|
| 443 |
}
|
| 444 |
|
| 445 |
if (section_list_count >= BBS_max_section)
|
| 446 |
{
|
| 447 |
log_error("section_list_count exceed limit %d >= %d\n", section_list_count, BBS_max_section);
|
| 448 |
return NULL;
|
| 449 |
}
|
| 450 |
|
| 451 |
sid_to_str(sid, sid_str);
|
| 452 |
|
| 453 |
p_section = p_section_list_pool + section_list_count;
|
| 454 |
|
| 455 |
p_section->sid = sid;
|
| 456 |
|
| 457 |
strncpy(p_section->sname, sname, sizeof(p_section->sname - 1));
|
| 458 |
p_section->sname[sizeof(p_section->sname - 1)] = '\0';
|
| 459 |
|
| 460 |
strncpy(p_section->stitle, stitle, sizeof(p_section->stitle - 1));
|
| 461 |
p_section->stitle[sizeof(p_section->stitle - 1)] = '\0';
|
| 462 |
|
| 463 |
strncpy(p_section->master_name, master_name, sizeof(p_section->master_name - 1));
|
| 464 |
p_section->master_name[sizeof(p_section->master_name - 1)] = '\0';
|
| 465 |
|
| 466 |
if (trie_dict_set(p_trie_dict_section_by_name, sname, section_list_count) != 1)
|
| 467 |
{
|
| 468 |
log_error("trie_dict_set(section, %s, %d) error\n", sname, section_list_count);
|
| 469 |
return NULL;
|
| 470 |
}
|
| 471 |
|
| 472 |
if (trie_dict_set(p_trie_dict_section_by_sid, sid_str, section_list_count) != 1)
|
| 473 |
{
|
| 474 |
log_error("trie_dict_set(section, %d, %d) error\n", sid, section_list_count);
|
| 475 |
log_std("Debug %x %x %x %x\n", sid_str[0], sid_str[1], sid_str[2], sid_str[3]);
|
| 476 |
return NULL;
|
| 477 |
}
|
| 478 |
|
| 479 |
section_list_reset_articles(p_section);
|
| 480 |
|
| 481 |
section_list_count++;
|
| 482 |
|
| 483 |
return p_section;
|
| 484 |
}
|
| 485 |
|
| 486 |
void section_list_reset_articles(SECTION_LIST *p_section)
|
| 487 |
{
|
| 488 |
p_section->article_count = 0;
|
| 489 |
p_section->topic_count = 0;
|
| 490 |
p_section->visible_article_count = 0;
|
| 491 |
p_section->visible_topic_count = 0;
|
| 492 |
p_section->p_article_head = NULL;
|
| 493 |
p_section->p_article_tail = NULL;
|
| 494 |
|
| 495 |
p_section->page_count = 0;
|
| 496 |
p_section->last_page_visible_article_count = 0;
|
| 497 |
}
|
| 498 |
|
| 499 |
void section_list_pool_cleanup(void)
|
| 500 |
{
|
| 501 |
if (p_trie_dict_section_by_name != NULL)
|
| 502 |
{
|
| 503 |
trie_dict_destroy(p_trie_dict_section_by_name);
|
| 504 |
p_trie_dict_section_by_name = NULL;
|
| 505 |
}
|
| 506 |
|
| 507 |
if (p_trie_dict_section_by_sid != NULL)
|
| 508 |
{
|
| 509 |
trie_dict_destroy(p_trie_dict_section_by_sid);
|
| 510 |
p_trie_dict_section_by_sid = NULL;
|
| 511 |
}
|
| 512 |
|
| 513 |
if (p_section_list_pool != NULL)
|
| 514 |
{
|
| 515 |
if (shmdt(p_section_list_pool) == -1)
|
| 516 |
{
|
| 517 |
log_error("shmdt(shmid = %d) error (%d)\n", section_list_pool_shmid, errno);
|
| 518 |
}
|
| 519 |
p_section_list_pool = NULL;
|
| 520 |
|
| 521 |
if (shmctl(section_list_pool_shmid, IPC_RMID, NULL) == -1)
|
| 522 |
{
|
| 523 |
log_error("shmctl(shmid = %d, IPC_RMID) error (%d)\n", section_list_pool_shmid, errno);
|
| 524 |
}
|
| 525 |
|
| 526 |
if (semctl(section_list_pool_semid, 0, IPC_RMID) == -1)
|
| 527 |
{
|
| 528 |
log_error("semctl(semid = %d, IPC_RMID) error (%d)\n", section_list_pool_semid, errno);
|
| 529 |
}
|
| 530 |
}
|
| 531 |
|
| 532 |
section_list_count = 0;
|
| 533 |
}
|
| 534 |
|
| 535 |
SECTION_LIST *section_list_find_by_name(const char *sname)
|
| 536 |
{
|
| 537 |
int64_t index;
|
| 538 |
|
| 539 |
if (p_section_list_pool == NULL || p_trie_dict_section_by_name == NULL)
|
| 540 |
{
|
| 541 |
log_error("section_list not initialized\n");
|
| 542 |
return NULL;
|
| 543 |
}
|
| 544 |
|
| 545 |
if (trie_dict_get(p_trie_dict_section_by_name, sname, &index) != 1)
|
| 546 |
{
|
| 547 |
log_error("trie_dict_get(section, %s) error\n", sname);
|
| 548 |
return NULL;
|
| 549 |
}
|
| 550 |
|
| 551 |
return (p_section_list_pool + index);
|
| 552 |
}
|
| 553 |
|
| 554 |
SECTION_LIST *section_list_find_by_sid(int32_t sid)
|
| 555 |
{
|
| 556 |
int64_t index;
|
| 557 |
char sid_str[SID_STR_LEN];
|
| 558 |
|
| 559 |
if (p_section_list_pool == NULL || p_trie_dict_section_by_sid == NULL)
|
| 560 |
{
|
| 561 |
log_error("section_list not initialized\n");
|
| 562 |
return NULL;
|
| 563 |
}
|
| 564 |
|
| 565 |
sid_to_str(sid, sid_str);
|
| 566 |
|
| 567 |
if (trie_dict_get(p_trie_dict_section_by_sid, sid_str, &index) != 1)
|
| 568 |
{
|
| 569 |
log_error("trie_dict_get(section, %d) error\n", sid);
|
| 570 |
return NULL;
|
| 571 |
}
|
| 572 |
|
| 573 |
return (p_section_list_pool + index);
|
| 574 |
}
|
| 575 |
|
| 576 |
int section_list_append_article(SECTION_LIST *p_section, const ARTICLE *p_article_src)
|
| 577 |
{
|
| 578 |
ARTICLE_BLOCK *p_block;
|
| 579 |
int32_t last_aid = 0;
|
| 580 |
ARTICLE *p_article;
|
| 581 |
ARTICLE *p_topic_head;
|
| 582 |
ARTICLE *p_topic_tail;
|
| 583 |
|
| 584 |
if (p_section == NULL || p_article_src == NULL)
|
| 585 |
{
|
| 586 |
log_error("section_list_append_article() NULL pointer error\n");
|
| 587 |
return -1;
|
| 588 |
}
|
| 589 |
|
| 590 |
if (p_article_block_pool == NULL)
|
| 591 |
{
|
| 592 |
log_error("article_block_pool not initialized\n");
|
| 593 |
return -1;
|
| 594 |
}
|
| 595 |
|
| 596 |
if (p_section->sid != p_article_src->sid)
|
| 597 |
{
|
| 598 |
log_error("section_list_append_article() error: section sid %d != article sid %d\n", p_section->sid, p_article_src->sid);
|
| 599 |
return -2;
|
| 600 |
}
|
| 601 |
|
| 602 |
if (p_section->article_count >= BBS_article_limit_per_section)
|
| 603 |
{
|
| 604 |
log_error("section_list_append_article() error: article_count reach limit in section %d\n", p_section->sid);
|
| 605 |
return -2;
|
| 606 |
}
|
| 607 |
|
| 608 |
if (p_article_block_pool->block_count == 0 ||
|
| 609 |
p_article_block_pool->p_block[p_article_block_pool->block_count - 1]->article_count >= ARTICLE_PER_BLOCK)
|
| 610 |
{
|
| 611 |
if ((p_block = pop_free_article_block()) == NULL)
|
| 612 |
{
|
| 613 |
log_error("pop_free_article_block() error\n");
|
| 614 |
return -2;
|
| 615 |
}
|
| 616 |
|
| 617 |
if (p_article_block_pool->block_count > 0)
|
| 618 |
{
|
| 619 |
last_aid = p_article_block_pool->p_block[p_article_block_pool->block_count - 1]->articles[ARTICLE_PER_BLOCK - 1].aid;
|
| 620 |
}
|
| 621 |
|
| 622 |
p_article_block_pool->p_block[p_article_block_pool->block_count] = p_block;
|
| 623 |
p_article_block_pool->block_count++;
|
| 624 |
}
|
| 625 |
else
|
| 626 |
{
|
| 627 |
p_block = p_article_block_pool->p_block[p_article_block_pool->block_count - 1];
|
| 628 |
last_aid = p_block->articles[p_block->article_count - 1].aid;
|
| 629 |
}
|
| 630 |
|
| 631 |
// AID of articles should be strictly ascending
|
| 632 |
if (p_article_src->aid <= last_aid)
|
| 633 |
{
|
| 634 |
log_error("section_list_append_article(aid=%d) error: last_aid=%d\n", p_article_src->aid, last_aid);
|
| 635 |
return -3;
|
| 636 |
}
|
| 637 |
|
| 638 |
p_article = (p_block->articles + p_block->article_count);
|
| 639 |
p_block->article_count++;
|
| 640 |
p_section->article_count++;
|
| 641 |
|
| 642 |
// Copy article data
|
| 643 |
*p_article = *p_article_src;
|
| 644 |
|
| 645 |
if (p_article->visible)
|
| 646 |
{
|
| 647 |
p_section->visible_article_count++;
|
| 648 |
}
|
| 649 |
|
| 650 |
// Link appended article as tail node of topic bi-directional list
|
| 651 |
if (p_article->tid != 0)
|
| 652 |
{
|
| 653 |
p_topic_head = article_block_find_by_aid(p_article->tid);
|
| 654 |
if (p_topic_head == NULL)
|
| 655 |
{
|
| 656 |
log_error("search head of topic (aid=%d) error\n", p_article->tid);
|
| 657 |
return -4;
|
| 658 |
}
|
| 659 |
|
| 660 |
p_topic_tail = p_topic_head->p_topic_prior;
|
| 661 |
if (p_topic_tail == NULL)
|
| 662 |
{
|
| 663 |
log_error("tail of topic (aid=%d) is NULL\n", p_article->tid);
|
| 664 |
return -4;
|
| 665 |
}
|
| 666 |
}
|
| 667 |
else
|
| 668 |
{
|
| 669 |
p_section->topic_count++;
|
| 670 |
|
| 671 |
if (p_article->visible)
|
| 672 |
{
|
| 673 |
p_section->visible_topic_count++;
|
| 674 |
}
|
| 675 |
|
| 676 |
p_topic_head = p_article;
|
| 677 |
p_topic_tail = p_article;
|
| 678 |
}
|
| 679 |
|
| 680 |
p_article->p_topic_prior = p_topic_tail;
|
| 681 |
p_article->p_topic_next = p_topic_head;
|
| 682 |
p_topic_head->p_topic_prior = p_article;
|
| 683 |
p_topic_tail->p_topic_next = p_article;
|
| 684 |
|
| 685 |
// Link appended article as tail node of article bi-directional list
|
| 686 |
if (p_section->p_article_head == NULL)
|
| 687 |
{
|
| 688 |
p_section->p_article_head = p_article;
|
| 689 |
p_section->p_article_tail = p_article;
|
| 690 |
}
|
| 691 |
p_article->p_prior = p_section->p_article_tail;
|
| 692 |
p_article->p_next = p_section->p_article_head;
|
| 693 |
p_section->p_article_head->p_prior = p_article;
|
| 694 |
p_section->p_article_tail->p_next = p_article;
|
| 695 |
p_section->p_article_tail = p_article;
|
| 696 |
|
| 697 |
// Update page
|
| 698 |
if ((p_article->visible && p_section->last_page_visible_article_count % BBS_article_limit_per_page == 0) ||
|
| 699 |
p_section->article_count == 1)
|
| 700 |
{
|
| 701 |
p_section->p_page_first_article[p_section->page_count] = p_article;
|
| 702 |
p_section->page_count++;
|
| 703 |
p_section->last_page_visible_article_count = 0;
|
| 704 |
}
|
| 705 |
|
| 706 |
if (p_article->visible)
|
| 707 |
{
|
| 708 |
p_section->last_page_visible_article_count++;
|
| 709 |
}
|
| 710 |
|
| 711 |
return 0;
|
| 712 |
}
|
| 713 |
|
| 714 |
int section_list_set_article_visible(SECTION_LIST *p_section, int32_t aid, int8_t visible)
|
| 715 |
{
|
| 716 |
ARTICLE *p_article;
|
| 717 |
ARTICLE *p_reply;
|
| 718 |
int affected_count = 0;
|
| 719 |
|
| 720 |
if (p_section == NULL)
|
| 721 |
{
|
| 722 |
log_error("section_list_set_article_visible() NULL pointer error\n");
|
| 723 |
return -2;
|
| 724 |
}
|
| 725 |
|
| 726 |
p_article = article_block_find_by_aid(aid);
|
| 727 |
if (p_article == NULL)
|
| 728 |
{
|
| 729 |
return -1; // Not found
|
| 730 |
}
|
| 731 |
|
| 732 |
if (p_section->sid != p_article->sid)
|
| 733 |
{
|
| 734 |
log_error("section_list_set_article_visible() error: section sid %d != article sid %d\n", p_section->sid, p_article->sid);
|
| 735 |
return -2;
|
| 736 |
}
|
| 737 |
|
| 738 |
if (p_article->visible == visible)
|
| 739 |
{
|
| 740 |
return 0; // Already set
|
| 741 |
}
|
| 742 |
|
| 743 |
if (visible == 0) // 1 -> 0
|
| 744 |
{
|
| 745 |
p_section->visible_article_count--;
|
| 746 |
|
| 747 |
if (p_article->tid == 0)
|
| 748 |
{
|
| 749 |
p_section->visible_topic_count--;
|
| 750 |
|
| 751 |
// Set related visible replies to invisible
|
| 752 |
for (p_reply = p_article->p_topic_next; p_reply->tid != 0; p_reply = p_reply->p_topic_next)
|
| 753 |
{
|
| 754 |
if (p_reply->tid != aid)
|
| 755 |
{
|
| 756 |
log_error("Inconsistent tid = %d found in reply %d of topic %d\n", p_reply->tid, p_reply->aid, aid);
|
| 757 |
continue;
|
| 758 |
}
|
| 759 |
|
| 760 |
if (p_reply->visible == 1)
|
| 761 |
{
|
| 762 |
p_reply->visible = 0;
|
| 763 |
p_section->visible_article_count--;
|
| 764 |
affected_count++;
|
| 765 |
}
|
| 766 |
}
|
| 767 |
}
|
| 768 |
}
|
| 769 |
else // 0 -> 1
|
| 770 |
{
|
| 771 |
p_section->visible_article_count++;
|
| 772 |
|
| 773 |
if (p_article->tid == 0)
|
| 774 |
{
|
| 775 |
p_section->visible_topic_count++;
|
| 776 |
}
|
| 777 |
}
|
| 778 |
|
| 779 |
p_article->visible = visible;
|
| 780 |
affected_count++;
|
| 781 |
|
| 782 |
return affected_count;
|
| 783 |
}
|
| 784 |
|
| 785 |
ARTICLE *section_list_find_article_with_offset(SECTION_LIST *p_section, int32_t aid, int32_t *p_page, int32_t *p_offset, ARTICLE **pp_next)
|
| 786 |
{
|
| 787 |
ARTICLE *p_article;
|
| 788 |
int left;
|
| 789 |
int right;
|
| 790 |
int mid;
|
| 791 |
|
| 792 |
*p_page = -1;
|
| 793 |
*p_offset = -1;
|
| 794 |
*pp_next = NULL;
|
| 795 |
|
| 796 |
if (p_section == NULL)
|
| 797 |
{
|
| 798 |
log_error("section_list_find_article_with_offset() NULL pointer error\n");
|
| 799 |
return NULL;
|
| 800 |
}
|
| 801 |
|
| 802 |
if (p_section->article_count == 0) // empty
|
| 803 |
{
|
| 804 |
*p_page = 0;
|
| 805 |
*p_offset = 0;
|
| 806 |
return NULL;
|
| 807 |
}
|
| 808 |
|
| 809 |
left = 0;
|
| 810 |
right = p_section->page_count;
|
| 811 |
|
| 812 |
// aid in the range [ head aid of pages[left], tail aid of pages[right - 1] ]
|
| 813 |
while (left < right - 1)
|
| 814 |
{
|
| 815 |
// get page id no less than mid value of left page id and right page id
|
| 816 |
mid = (left + right) / 2 + (right - left) % 2;
|
| 817 |
|
| 818 |
if (mid >= p_section->page_count)
|
| 819 |
{
|
| 820 |
log_error("page id (mid = %d) is out of boundary\n", mid);
|
| 821 |
return NULL;
|
| 822 |
}
|
| 823 |
|
| 824 |
if (aid < p_section->p_page_first_article[mid]->aid)
|
| 825 |
{
|
| 826 |
right = mid;
|
| 827 |
}
|
| 828 |
else
|
| 829 |
{
|
| 830 |
left = mid;
|
| 831 |
}
|
| 832 |
}
|
| 833 |
|
| 834 |
*p_page = left;
|
| 835 |
|
| 836 |
p_article = p_section->p_page_first_article[*p_page];
|
| 837 |
|
| 838 |
// p_section->p_page_first_article[*p_page]->aid <= aid < p_section->p_page_first_article[*p_page + 1]->aid
|
| 839 |
right = (*p_page == MAX(0, p_section->page_count - 1) ? INT32_MAX : p_section->p_page_first_article[*p_page + 1]->aid);
|
| 840 |
|
| 841 |
// left will be the offset of article found or offset to insert
|
| 842 |
left = 0;
|
| 843 |
|
| 844 |
while (aid > p_article->aid)
|
| 845 |
{
|
| 846 |
p_article = p_article->p_next;
|
| 847 |
left++;
|
| 848 |
|
| 849 |
if (aid == p_article->aid)
|
| 850 |
{
|
| 851 |
*pp_next = p_article->p_next;
|
| 852 |
break;
|
| 853 |
}
|
| 854 |
|
| 855 |
// over last article in the page
|
| 856 |
if (p_article == p_section->p_article_head || p_article->aid >= right)
|
| 857 |
{
|
| 858 |
*pp_next = (p_article == p_section->p_article_head ? p_section->p_article_head : p_section->p_page_first_article[*p_page + 1]);
|
| 859 |
*p_offset = left;
|
| 860 |
return NULL; // not found
|
| 861 |
}
|
| 862 |
}
|
| 863 |
|
| 864 |
if (aid < p_article->aid)
|
| 865 |
{
|
| 866 |
*pp_next = p_article;
|
| 867 |
p_article = NULL; // not found
|
| 868 |
}
|
| 869 |
else // aid == p_article->aid
|
| 870 |
{
|
| 871 |
*pp_next = p_article->p_next;
|
| 872 |
}
|
| 873 |
|
| 874 |
*p_offset = left;
|
| 875 |
|
| 876 |
return p_article;
|
| 877 |
}
|
| 878 |
|
| 879 |
int section_list_calculate_page(SECTION_LIST *p_section, int32_t start_aid)
|
| 880 |
{
|
| 881 |
ARTICLE *p_article;
|
| 882 |
ARTICLE *p_next;
|
| 883 |
int32_t page;
|
| 884 |
int32_t offset;
|
| 885 |
int visible_article_count;
|
| 886 |
int page_head_set;
|
| 887 |
|
| 888 |
if (p_section == NULL)
|
| 889 |
{
|
| 890 |
log_error("section_list_calculate_page() NULL pointer error\n");
|
| 891 |
return -1;
|
| 892 |
}
|
| 893 |
|
| 894 |
if (p_section->article_count == 0) // empty
|
| 895 |
{
|
| 896 |
p_section->page_count = 0;
|
| 897 |
p_section->last_page_visible_article_count = 0;
|
| 898 |
|
| 899 |
return 0;
|
| 900 |
}
|
| 901 |
|
| 902 |
if (start_aid > 0)
|
| 903 |
{
|
| 904 |
p_article = article_block_find_by_aid(start_aid);
|
| 905 |
if (p_article == NULL)
|
| 906 |
{
|
| 907 |
return -1; // Not found
|
| 908 |
}
|
| 909 |
|
| 910 |
if (p_section->sid != p_article->sid)
|
| 911 |
{
|
| 912 |
log_error("section_list_calculate_page() error: section sid %d != start article sid %d\n", p_section->sid, p_article->sid);
|
| 913 |
return -2;
|
| 914 |
}
|
| 915 |
|
| 916 |
p_article = section_list_find_article_with_offset(p_section, start_aid, &page, &offset, &p_next);
|
| 917 |
if (p_article == NULL)
|
| 918 |
{
|
| 919 |
if (page < 0)
|
| 920 |
{
|
| 921 |
return -1;
|
| 922 |
}
|
| 923 |
log_error("section_list_calculate_page() aid = %d not found in section sid = %d\n",
|
| 924 |
start_aid, p_section->sid);
|
| 925 |
return -2;
|
| 926 |
}
|
| 927 |
|
| 928 |
if (offset > 0)
|
| 929 |
{
|
| 930 |
p_article = p_section->p_page_first_article[page];
|
| 931 |
}
|
| 932 |
}
|
| 933 |
else
|
| 934 |
{
|
| 935 |
p_article = p_section->p_article_head;
|
| 936 |
page = 0;
|
| 937 |
offset = 0;
|
| 938 |
}
|
| 939 |
|
| 940 |
visible_article_count = 0;
|
| 941 |
page_head_set = 0;
|
| 942 |
|
| 943 |
do
|
| 944 |
{
|
| 945 |
if (!page_head_set && visible_article_count == 0)
|
| 946 |
{
|
| 947 |
p_section->p_page_first_article[page] = p_article;
|
| 948 |
page_head_set = 1;
|
| 949 |
}
|
| 950 |
|
| 951 |
if (p_article->visible)
|
| 952 |
{
|
| 953 |
visible_article_count++;
|
| 954 |
}
|
| 955 |
|
| 956 |
p_article = p_article->p_next;
|
| 957 |
|
| 958 |
// skip remaining invisible articles
|
| 959 |
while (p_article->visible == 0 && p_article != p_section->p_article_head)
|
| 960 |
{
|
| 961 |
p_article = p_article->p_next;
|
| 962 |
}
|
| 963 |
|
| 964 |
if (visible_article_count >= BBS_article_limit_per_page && p_article != p_section->p_article_head)
|
| 965 |
{
|
| 966 |
page++;
|
| 967 |
visible_article_count = 0;
|
| 968 |
page_head_set = 0;
|
| 969 |
|
| 970 |
if (page >= BBS_article_limit_per_section / BBS_article_limit_per_page && p_article != p_section->p_article_head)
|
| 971 |
{
|
| 972 |
log_error("Count of page exceed limit in section %d\n", p_section->sid);
|
| 973 |
break;
|
| 974 |
}
|
| 975 |
}
|
| 976 |
} while (p_article != p_section->p_article_head);
|
| 977 |
|
| 978 |
p_section->page_count = page + (visible_article_count > 0 ? 1 : 0);
|
| 979 |
p_section->last_page_visible_article_count = visible_article_count;
|
| 980 |
|
| 981 |
return 0;
|
| 982 |
}
|
| 983 |
|
| 984 |
int article_count_of_topic(int32_t aid)
|
| 985 |
{
|
| 986 |
ARTICLE *p_article;
|
| 987 |
int article_count;
|
| 988 |
|
| 989 |
p_article = article_block_find_by_aid(aid);
|
| 990 |
if (p_article == NULL)
|
| 991 |
{
|
| 992 |
return 0; // Not found
|
| 993 |
}
|
| 994 |
|
| 995 |
article_count = 0;
|
| 996 |
|
| 997 |
do
|
| 998 |
{
|
| 999 |
if (p_article->tid != 0 && p_article->tid != aid)
|
| 1000 |
{
|
| 1001 |
log_error("article_count_of_topic(%d) error: article %d not linked to the topic\n", aid, p_article->aid);
|
| 1002 |
break;
|
| 1003 |
}
|
| 1004 |
|
| 1005 |
article_count++;
|
| 1006 |
p_article = p_article->p_topic_next;
|
| 1007 |
} while (p_article->aid != aid);
|
| 1008 |
|
| 1009 |
return article_count;
|
| 1010 |
}
|
| 1011 |
|
| 1012 |
int section_list_move_topic(SECTION_LIST *p_section_src, SECTION_LIST *p_section_dest, int32_t aid)
|
| 1013 |
{
|
| 1014 |
ARTICLE *p_article;
|
| 1015 |
ARTICLE *p_next;
|
| 1016 |
int32_t page;
|
| 1017 |
int32_t offset;
|
| 1018 |
int32_t move_article_count;
|
| 1019 |
int32_t dest_article_count_old;
|
| 1020 |
int32_t last_unaffected_aid_src;
|
| 1021 |
int32_t first_inserted_aid_dest;
|
| 1022 |
int move_counter;
|
| 1023 |
|
| 1024 |
if (p_section_dest == NULL)
|
| 1025 |
{
|
| 1026 |
log_error("section_list_move_topic() NULL pointer error\n");
|
| 1027 |
return -1;
|
| 1028 |
}
|
| 1029 |
|
| 1030 |
if ((p_article = article_block_find_by_aid(aid)) == NULL)
|
| 1031 |
{
|
| 1032 |
log_error("section_list_move_topic() error: article %d not found in block\n", aid);
|
| 1033 |
return -2;
|
| 1034 |
}
|
| 1035 |
|
| 1036 |
if (p_section_src->sid != p_article->sid)
|
| 1037 |
{
|
| 1038 |
log_error("section_list_move_topic() error: src section sid %d != article %d sid %d\n",
|
| 1039 |
p_section_src->sid, p_article->aid, p_article->sid);
|
| 1040 |
return -2;
|
| 1041 |
}
|
| 1042 |
|
| 1043 |
if (p_article->tid != 0)
|
| 1044 |
{
|
| 1045 |
log_error("section_list_move_topic(aid = %d) error: article is not head of topic, tid = %d\n", aid, p_article->tid);
|
| 1046 |
return -2;
|
| 1047 |
}
|
| 1048 |
|
| 1049 |
last_unaffected_aid_src = (p_article == p_section_src->p_article_head ? 0 : p_article->p_prior->aid);
|
| 1050 |
|
| 1051 |
move_article_count = article_count_of_topic(aid);
|
| 1052 |
if (move_article_count <= 0)
|
| 1053 |
{
|
| 1054 |
log_error("section_list_count_of_topic_articles(aid = %d) <= 0\n", aid);
|
| 1055 |
return -2;
|
| 1056 |
}
|
| 1057 |
|
| 1058 |
if (p_section_dest->article_count + move_article_count > BBS_article_limit_per_section)
|
| 1059 |
{
|
| 1060 |
log_error("section_list_move_topic() error: article_count %d reach limit in section %d\n",
|
| 1061 |
p_section_dest->article_count + move_article_count, p_section_dest->sid);
|
| 1062 |
return -3;
|
| 1063 |
}
|
| 1064 |
|
| 1065 |
dest_article_count_old = p_section_dest->article_count;
|
| 1066 |
move_counter = 0;
|
| 1067 |
first_inserted_aid_dest = p_article->aid;
|
| 1068 |
|
| 1069 |
do
|
| 1070 |
{
|
| 1071 |
if (p_section_src->sid != p_article->sid)
|
| 1072 |
{
|
| 1073 |
log_error("section_list_move_topic() error: src section sid %d != article %d sid %d\n",
|
| 1074 |
p_section_src->sid, p_article->aid, p_article->sid);
|
| 1075 |
return -2;
|
| 1076 |
}
|
| 1077 |
|
| 1078 |
// Remove from bi-directional article list of src section
|
| 1079 |
if (p_section_src->p_article_head == p_article)
|
| 1080 |
{
|
| 1081 |
p_section_src->p_article_head = p_article->p_next;
|
| 1082 |
}
|
| 1083 |
if (p_section_src->p_article_tail == p_article)
|
| 1084 |
{
|
| 1085 |
p_section_src->p_article_tail = p_article->p_prior;
|
| 1086 |
}
|
| 1087 |
if (p_section_src->p_article_head == p_article) // || p_section_src->p_article_tail == p_article
|
| 1088 |
{
|
| 1089 |
p_section_src->p_article_head = NULL;
|
| 1090 |
p_section_src->p_article_tail = NULL;
|
| 1091 |
}
|
| 1092 |
|
| 1093 |
p_article->p_prior->p_next = p_article->p_next;
|
| 1094 |
p_article->p_next->p_prior = p_article->p_prior;
|
| 1095 |
|
| 1096 |
// Update sid of article
|
| 1097 |
p_article->sid = p_section_dest->sid;
|
| 1098 |
|
| 1099 |
if (section_list_find_article_with_offset(p_section_dest, p_article->aid, &page, &offset, &p_next) != NULL)
|
| 1100 |
{
|
| 1101 |
log_error("section_list_move_topic() error: article %d already in section %d\n", p_article->aid, p_section_dest->sid);
|
| 1102 |
return -4;
|
| 1103 |
}
|
| 1104 |
|
| 1105 |
// Insert into bi-directional article list of dest section
|
| 1106 |
if (p_next == NULL) // empty section
|
| 1107 |
{
|
| 1108 |
p_section_dest->p_article_head = p_article;
|
| 1109 |
p_section_dest->p_article_tail = p_article;
|
| 1110 |
p_article->p_prior = p_article;
|
| 1111 |
p_article->p_next = p_article;
|
| 1112 |
}
|
| 1113 |
else
|
| 1114 |
{
|
| 1115 |
if (p_section_dest->p_article_head == p_next)
|
| 1116 |
{
|
| 1117 |
if (p_article->aid < p_next->aid)
|
| 1118 |
{
|
| 1119 |
p_section_dest->p_article_head = p_article;
|
| 1120 |
}
|
| 1121 |
else // p_article->aid > p_next->aid
|
| 1122 |
{
|
| 1123 |
p_section_dest->p_article_tail = p_article;
|
| 1124 |
}
|
| 1125 |
}
|
| 1126 |
|
| 1127 |
p_article->p_prior = p_next->p_prior;
|
| 1128 |
p_article->p_next = p_next;
|
| 1129 |
p_next->p_prior->p_next = p_article;
|
| 1130 |
p_next->p_prior = p_article;
|
| 1131 |
}
|
| 1132 |
|
| 1133 |
// Update article / topic counter of src / desc section
|
| 1134 |
p_section_src->article_count--;
|
| 1135 |
p_section_dest->article_count++;
|
| 1136 |
if (p_article->tid == 0)
|
| 1137 |
{
|
| 1138 |
p_section_src->topic_count--;
|
| 1139 |
p_section_dest->topic_count++;
|
| 1140 |
}
|
| 1141 |
|
| 1142 |
// Update visible article / topic counter of src / desc section
|
| 1143 |
if (p_article->visible)
|
| 1144 |
{
|
| 1145 |
p_section_src->visible_article_count--;
|
| 1146 |
p_section_dest->visible_article_count++;
|
| 1147 |
if (p_article->tid == 0)
|
| 1148 |
{
|
| 1149 |
p_section_src->visible_topic_count--;
|
| 1150 |
p_section_dest->visible_topic_count++;
|
| 1151 |
}
|
| 1152 |
}
|
| 1153 |
|
| 1154 |
// Update page for empty dest section
|
| 1155 |
if (p_section_dest->article_count == 1)
|
| 1156 |
{
|
| 1157 |
p_section_dest->p_page_first_article[0] = p_article;
|
| 1158 |
p_section_dest->page_count = 1;
|
| 1159 |
p_section_dest->last_page_visible_article_count = (p_article->visible ? 1 : 0);
|
| 1160 |
}
|
| 1161 |
|
| 1162 |
p_article = p_article->p_topic_next;
|
| 1163 |
|
| 1164 |
move_counter++;
|
| 1165 |
if (move_counter % CALCULATE_PAGE_THRESHOLD == 0)
|
| 1166 |
{
|
| 1167 |
// Re-calculate pages of desc section
|
| 1168 |
if (section_list_calculate_page(p_section_dest, first_inserted_aid_dest) < 0)
|
| 1169 |
{
|
| 1170 |
log_error("section_list_calculate_page(dest section = %d, aid = %d) error\n",
|
| 1171 |
p_section_dest->sid, first_inserted_aid_dest);
|
| 1172 |
}
|
| 1173 |
|
| 1174 |
first_inserted_aid_dest = p_article->aid;
|
| 1175 |
}
|
| 1176 |
} while (p_article->aid != aid);
|
| 1177 |
|
| 1178 |
if (p_section_dest->article_count - dest_article_count_old != move_article_count)
|
| 1179 |
{
|
| 1180 |
log_error("section_list_move_topic() error: count of moved articles %d != %d\n",
|
| 1181 |
p_section_dest->article_count - dest_article_count_old, move_article_count);
|
| 1182 |
}
|
| 1183 |
|
| 1184 |
// Re-calculate pages of src section
|
| 1185 |
if (section_list_calculate_page(p_section_src, last_unaffected_aid_src) < 0)
|
| 1186 |
{
|
| 1187 |
log_error("section_list_calculate_page(src section = %d, aid = %d) error at aid = %d\n",
|
| 1188 |
p_section_src->sid, last_unaffected_aid_src, aid);
|
| 1189 |
}
|
| 1190 |
|
| 1191 |
if (move_counter % CALCULATE_PAGE_THRESHOLD != 0)
|
| 1192 |
{
|
| 1193 |
// Re-calculate pages of desc section
|
| 1194 |
if (section_list_calculate_page(p_section_dest, first_inserted_aid_dest) < 0)
|
| 1195 |
{
|
| 1196 |
log_error("section_list_calculate_page(dest section = %d, aid = %d) error\n",
|
| 1197 |
p_section_dest->sid, first_inserted_aid_dest);
|
| 1198 |
}
|
| 1199 |
}
|
| 1200 |
|
| 1201 |
return move_article_count;
|
| 1202 |
}
|
| 1203 |
|
| 1204 |
int get_section_index(SECTION_LIST *p_section)
|
| 1205 |
{
|
| 1206 |
int index;
|
| 1207 |
|
| 1208 |
if (p_section_list_pool == NULL)
|
| 1209 |
{
|
| 1210 |
log_error("get_section_index() error: uninitialized\n");
|
| 1211 |
return -1;
|
| 1212 |
}
|
| 1213 |
|
| 1214 |
if (p_section == NULL)
|
| 1215 |
{
|
| 1216 |
index = BBS_max_section;
|
| 1217 |
}
|
| 1218 |
else
|
| 1219 |
{
|
| 1220 |
index = (int)(p_section - p_section_list_pool);
|
| 1221 |
if (index < 0 || index >= BBS_max_section)
|
| 1222 |
{
|
| 1223 |
log_error("get_section_index(%d) error: index out of range\n", index);
|
| 1224 |
return -2;
|
| 1225 |
}
|
| 1226 |
}
|
| 1227 |
|
| 1228 |
return index;
|
| 1229 |
}
|
| 1230 |
|
| 1231 |
int section_list_try_rd_lock(SECTION_LIST *p_section, int wait_sec)
|
| 1232 |
{
|
| 1233 |
int index;
|
| 1234 |
struct sembuf sops[4];
|
| 1235 |
struct timespec timeout;
|
| 1236 |
int ret;
|
| 1237 |
|
| 1238 |
index = get_section_index(p_section);
|
| 1239 |
if (index < 0)
|
| 1240 |
{
|
| 1241 |
return -2;
|
| 1242 |
}
|
| 1243 |
|
| 1244 |
sops[0].sem_num = (unsigned short)(index * 2 + 1); // w_sem of section index
|
| 1245 |
sops[0].sem_op = 0; // wait until unlocked
|
| 1246 |
sops[0].sem_flg = 0;
|
| 1247 |
|
| 1248 |
sops[1].sem_num = (unsigned short)(index * 2); // r_sem of section index
|
| 1249 |
sops[1].sem_op = 1; // lock
|
| 1250 |
sops[1].sem_flg = SEM_UNDO; // undo on terminate
|
| 1251 |
|
| 1252 |
// Read lock on any specific section will also acquire single read lock on "all section"
|
| 1253 |
// so that write lock on all section only need to acquire single write on on "all section"
|
| 1254 |
// rather than to acquire multiple write locks on all the available sections.
|
| 1255 |
if (index == BBS_max_section)
|
| 1256 |
{
|
| 1257 |
sops[2].sem_num = BBS_max_section * 2 + 1; // w_sem of all section
|
| 1258 |
sops[2].sem_op = 0; // wait until unlocked
|
| 1259 |
sops[2].sem_flg = 0;
|
| 1260 |
|
| 1261 |
sops[3].sem_num = BBS_max_section * 2; // r_sem of all section
|
| 1262 |
sops[3].sem_op = 1; // lock
|
| 1263 |
sops[3].sem_flg = SEM_UNDO; // undo on terminate
|
| 1264 |
}
|
| 1265 |
|
| 1266 |
timeout.tv_sec = wait_sec;
|
| 1267 |
timeout.tv_nsec = 0;
|
| 1268 |
|
| 1269 |
ret = semtimedop(section_list_pool_semid, sops, (index == BBS_max_section ? 4 : 2), &timeout);
|
| 1270 |
if (ret == -1 && errno != EAGAIN && errno != EINTR)
|
| 1271 |
{
|
| 1272 |
log_error("semtimedop(index = %d, lock read) error %d\n", index, errno);
|
| 1273 |
}
|
| 1274 |
|
| 1275 |
return ret;
|
| 1276 |
}
|
| 1277 |
|
| 1278 |
int section_list_try_rw_lock(SECTION_LIST *p_section, int wait_sec)
|
| 1279 |
{
|
| 1280 |
int index;
|
| 1281 |
struct sembuf sops[3];
|
| 1282 |
struct timespec timeout;
|
| 1283 |
int ret;
|
| 1284 |
|
| 1285 |
index = get_section_index(p_section);
|
| 1286 |
if (index < 0)
|
| 1287 |
{
|
| 1288 |
return -2;
|
| 1289 |
}
|
| 1290 |
|
| 1291 |
sops[0].sem_num = (unsigned short)(index * 2 + 1); // w_sem of section index
|
| 1292 |
sops[0].sem_op = 0; // wait until unlocked
|
| 1293 |
sops[0].sem_flg = 0;
|
| 1294 |
|
| 1295 |
sops[1].sem_num = (unsigned short)(index * 2 + 1); // w_sem of section index
|
| 1296 |
sops[1].sem_op = 1; // lock
|
| 1297 |
sops[1].sem_flg = SEM_UNDO; // undo on terminate
|
| 1298 |
|
| 1299 |
sops[2].sem_num = (unsigned short)(index * 2); // r_sem of section index
|
| 1300 |
sops[2].sem_op = 0; // wait until unlocked
|
| 1301 |
sops[2].sem_flg = 0;
|
| 1302 |
|
| 1303 |
timeout.tv_sec = wait_sec;
|
| 1304 |
timeout.tv_nsec = 0;
|
| 1305 |
|
| 1306 |
ret = semtimedop(section_list_pool_semid, sops, 3, &timeout);
|
| 1307 |
if (ret == -1 && errno != EAGAIN && errno != EINTR)
|
| 1308 |
{
|
| 1309 |
log_error("semtimedop(index = %d, lock write) error %d\n", index, errno);
|
| 1310 |
}
|
| 1311 |
|
| 1312 |
return ret;
|
| 1313 |
}
|
| 1314 |
|
| 1315 |
int section_list_rd_unlock(SECTION_LIST *p_section)
|
| 1316 |
{
|
| 1317 |
int index;
|
| 1318 |
struct sembuf sops[2];
|
| 1319 |
int ret;
|
| 1320 |
|
| 1321 |
index = get_section_index(p_section);
|
| 1322 |
if (index < 0)
|
| 1323 |
{
|
| 1324 |
return -2;
|
| 1325 |
}
|
| 1326 |
|
| 1327 |
sops[0].sem_num = (unsigned short)(index * 2); // r_sem of section index
|
| 1328 |
sops[0].sem_op = -1; // unlock
|
| 1329 |
sops[0].sem_flg = IPC_NOWAIT | SEM_UNDO; // no wait
|
| 1330 |
|
| 1331 |
// The same reason as section_list_try_rd_lock()
|
| 1332 |
if (index == BBS_max_section)
|
| 1333 |
{
|
| 1334 |
sops[1].sem_num = BBS_max_section * 2; // r_sem of all section
|
| 1335 |
sops[1].sem_op = -1; // unlock
|
| 1336 |
sops[1].sem_flg = IPC_NOWAIT | SEM_UNDO; // no wait
|
| 1337 |
}
|
| 1338 |
|
| 1339 |
ret = semop(section_list_pool_semid, sops, (index == BBS_max_section ? 2 : 1));
|
| 1340 |
if (ret == -1 && errno != EAGAIN && errno != EINTR)
|
| 1341 |
{
|
| 1342 |
log_error("semop(index = %d, unlock read) error %d\n", index, errno);
|
| 1343 |
}
|
| 1344 |
|
| 1345 |
return ret;
|
| 1346 |
}
|
| 1347 |
|
| 1348 |
int section_list_rw_unlock(SECTION_LIST *p_section)
|
| 1349 |
{
|
| 1350 |
int index;
|
| 1351 |
struct sembuf sops[1];
|
| 1352 |
int ret;
|
| 1353 |
|
| 1354 |
index = get_section_index(p_section);
|
| 1355 |
if (index < 0)
|
| 1356 |
{
|
| 1357 |
return -2;
|
| 1358 |
}
|
| 1359 |
|
| 1360 |
sops[0].sem_num = (unsigned short)(index * 2 + 1); // w_sem of section index
|
| 1361 |
sops[0].sem_op = -1; // unlock
|
| 1362 |
sops[0].sem_flg = IPC_NOWAIT | SEM_UNDO; // no wait
|
| 1363 |
|
| 1364 |
ret = semop(section_list_pool_semid, sops, 1);
|
| 1365 |
if (ret == -1 && errno != EAGAIN && errno != EINTR)
|
| 1366 |
{
|
| 1367 |
log_error("semop(index = %d, unlock write) error %d\n", index, errno);
|
| 1368 |
}
|
| 1369 |
|
| 1370 |
return ret;
|
| 1371 |
}
|
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