嵌入式Linux应用程序开发——多线程2(线程的同步——互斥锁)
2019-07-13 05:07发布
生成海报
/*pthread2.c*/
#include
#include
#include
#include
int global;
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;//静态初始化互斥锁
void *thread_function(void *arg)
{
int i,j;
for(i=0;i<10;i++)
{
pthread_mutex_lock(&mutex);//上锁
j = global;
j++;
printf("-");
fflush(stdout);
global = j;
usleep(10000);
pthread_mutex_unlock(&mutex);//解锁
}
return NULL;
}
int main(void)
{
pthread_t th_new;
int i;
setbuf(stdout,NULL);
if(pthread_create(&th_new,NULL,thread_function,NULL))
{
perror("error creating thread.");
abort();
}
for(i=0;i<10;i++)
{
pthread_mutex_lock(&mutex);
global++;
pthread_mutex_unlock(&mutex);
printf("m");
fflush(stdout);
usleep(10000);
}
if(pthread_join(th_new,NULL))
{
perror("error joining thread");
abort();
}
printf("
result is :%d
",global);
exit(0);
}
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