关于递归锁

递归锁在同一线程内起作用。

//线程属性#include <stdio.h>#include <stdlib.h>#include <pthread.h>pthread_mutex_t g_mutex;void test_fun(void);static void thread_init(void){//初始化锁的属性pthread_mutexattr_t attr;pthread_mutexattr_init(&attr);pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE_NP);//设置锁的属性为可递归//设置锁的属性pthread_mutex_init(&g_mutex, &attr);//销毁pthread_mutexattr_destroy(&attr);}//线程执行函数void* thr_fun(void* arg){int ret;ret=pthread_mutex_lock(&g_mutex);if( ret!=0 ){perror("thread pthread_mutex_lock");exit(1);}printf("this is a thread !/n");test_fun();ret=pthread_mutex_unlock(&g_mutex);if( ret!=0 ){perror("thread pthread_mutex_unlock");exit(1);}return NULL;}//测试函数void test_fun(void){int ret;ret=pthread_mutex_lock(&g_mutex);if( ret!=0 ){perror("test pthread_mutex_lock");exit(1);}printf("this is a test!/n");ret=pthread_mutex_unlock(&g_mutex);if( ret!=0 ){perror("test pthread_mutex_unlock");exit(1);}}int main(int argc, char *argv[]){int ret;thread_init();pthread_t tid;ret=pthread_create(&tid, NULL, thr_fun, NULL);if( ret!=0 ){perror("thread create");exit(1);}pthread_join(tid, NULL);return 0;}

执行结果为：

this is a thread !
this is a test!