UNIX環境高級編程學習之第十二章線程控制-以分離狀態創建線程

UNIX環境高級編程學習之第十二章線程控制-以分離狀態創建線程

/* FileName: CreateDetachThread.c Date: 20100624 Desc: gcc CreateDetachThread.c -lpthread -o demo 以分離狀態創建線程 */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <pthread.h> #include <signal.h> pthread_mutex_t g_mutex = PTHREAD_MUTEX_INITIALIZER; // 互斥鎖定義並初始化 pthread_cond_t g_cond = PTHREAD_COND_INITIALIZER; // 條件變量定義並初始化 struct msg { // 鏈表 struct msg *m_next; char data[100]; // 處理數據 }; struct msg * msgHead = NULL; void* thread_fun(void * arg) { struct msg *msgCur; // 當前數據 while (1) { pthread_mutex_lock(&g_mutex); while(msgHead == NULL) pthread_cond_wait(&g_cond, &g_mutex); msgCur = msgHead; msgHead = msgHead->m_next; /* 處理數據 msgCur */ printf("Data:%s/n", msgCur->data); free(msgCur); msgCur = NULL; pthread_mutex_unlock(&g_mutex); } return (void*)1; } int main(int argc, char* argv[]) { int ret; pthread_t t; pthread_attr_t attr; // 線程屬性 ret = pthread_attr_init(&attr); // 初始化線程屬性 if (ret != 0) { printf(" pthread_attr_init() is Error t1 /n"); exit(-1); } ret = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); // 設置線程屬性爲分離狀態 if (ret != 0) { printf(" pthread_attr_setdetachstate() is Error t1 /n"); exit(-1); } ret = pthread_create(&t, &attr, thread_fun, NULL); // 創建線程加入線程屬性 if (ret != 0) { printf("pthread_create() is Error t1 /n"); exit(-1); } ret = pthread_attr_destroy(&attr); // 銷燬線程屬性內的空間 /* 每隔兩秒添加一次數據 */ struct msg *msgCur; while (1) { pthread_mutex_lock(&g_mutex); msgCur = malloc(sizeof(struct msg)); if (msgCur == NULL) { printf("malloc() is Failed! /n"); exit(-1); } memset(msgCur, 0x00, sizeof(struct msg)); msgCur->m_next = msgHead; strcpy(msgCur->data, "Hello"); msgHead = msgCur; pthread_mutex_unlock(&g_mutex); pthread_cond_signal(&g_cond); sleep(2); } pthread_mutex_destroy(&g_mutex); // 銷燬互斥鎖 pthread_cond_destroy(&g_cond); // 銷燬條件 return 0; }