一段簡單的Linux線程池代碼

實現web server時，通過創建一個線程池來併發處理客戶端的http請求，代碼如下：

 

for(i = 0; i < THREAD_POOL_SIZE; i++) { pthread_create(&thread_pool[i], NULL, (void*)&worker, (void*)i); pthread_detach(thread_pool[i]); }

 

線程併發處理如下：

void* worker(int n) { struct server_struct *request; DebugMSG("Worker %d started!", n); while(loop) // Global variable of "loop" indicates that server is running, if not set, quit { pthread_mutex_lock(&pool_mutex); // You should lock mutex before pthread_cond_wait call.. request = pop_request(); if (request == NULL) { // No more jobs, go to sleep now pthread_cond_wait(&new_request, &pool_mutex); // On pthread_cond_signal event pthread_cond_wait lock's mutex via pthread_mutex_lock request = pop_request(); } pthread_mutex_unlock(&pool_mutex); // so, you must unlock it. if(request != NULL) server(request); pthread_cond_signal(&thread_free); } pthread_exit(NULL); return NULL; } int push_request(struct server_struct* request) { int i, added = 0; pthread_mutex_lock(&pool_mutex); for(i = 0; (i < THREAD_POOL_SIZE)&&(!added); i++) { if(pool[i] == NULL) { pool[i] = request; added = 1; } } pthread_mutex_unlock(&pool_mutex); if (added) pthread_cond_signal(&new_request); return added; } struct server_struct* pop_request() { int i; struct server_struct *request = NULL; for(i = 0; (i < THREAD_POOL_SIZE)&&(request == NULL); i++) { if(pool[i] != NULL) { request = pool[i]; pool[i] = NULL; } } return request; }