4-11mutexattr.c

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <string.h>

int main(int argc, const char *argv[])
{
/*定义互斥锁*/
	pthread_mutex_t mutex; 
	if(argc < 2){
		printf("input mutex type\n");
		return -1;
	}
/*定义互斥锁属性*/
	pthread_mutexattr_t mutexattr;
/*初始化互斥锁属性*/
	pthread_mutexattr_init(&mutexattr);
/*设置互斥锁类型，error:检错互斥锁，normal:标准互斥锁，recursive:递归互斥锁*/
	if(!strcmp(argv[1] , "error")){
		pthread_mutexattr_settype(&mutexattr, 
				PTHREAD_MUTEX_ERRORCHECK);
		printf("set error succes\n");
	}else if(!strcmp(argv[1],"normal")){
		pthread_mutexattr_settype(&mutexattr, 
				PTHREAD_MUTEX_NORMAL);
		printf("set normal succes\n");
	}else if(!strcmp(argv[1], "recursive")){
		pthread_mutexattr_settype(&mutexattr, 
				PTHREAD_MUTEX_RECURSIVE);
		printf("set recursive\n");
	}

/*初始化互斥锁*/
	pthread_mutex_init(&mutex ,&mutexattr);
/*第一次上锁*/
	if(pthread_mutex_lock(&mutex) != 0){
		printf("lock failed\n");
	}else{
		printf("lock succes\n");
	}
/*第二次上锁*/
	if(pthread_mutex_lock(&mutex) != 0){
		printf("lock failed\n");
	}else{
		printf("lock succes\n");
	}
/*加锁几次，同样也要释放几次*/
	pthread_mutex_unlock(&mutex);
	pthread_mutex_unlock(&mutex);
/*销毁互斥锁属性和互斥锁*/
	pthread_mutexattr_destroy(&mutexattr);
	pthread_mutex_destroy(&mutex);
	return 0;
}