linux 线程挂起恢复的简单示例

#include <unistd.h>
#include <pthread.h>

static pthread_mutex_t mutex;
static pthread_cond_t cond;
static int flag = 0;

void srpthread_init()
{
pthread_mutex_init(&mutex,NULL);
pthread_cond_init(&cond,NULL);
}

void srpthread_suspend()
{
pthread_mutex_lock(&mutex);
flag--;
pthread_mutex_unlock(&mutex);
}

void srpthread_resume()
{
pthread_mutex_lock(&mutex);
flag++;
pthread_cond_signal(&cond);
pthread_mutex_unlock(&mutex);
}

void *thread_run()
{
while(1)
{
pthread_mutex_lock(&mutex);
while(flag<=0)
{
pthread_cond_wait(&cond,&mutex);
}

pthread_mutex_unlock(&mutex);

//actual work
printf("i am running!\n");
}

}

int main(int argc,char *argv[])
{
char ch;
pthread_t p1;
srpthread_init();
pthread_create(&p1,NULL,(void *)thread_run,NULL);

while(1)
{
scanf("%c",&ch);
switch(ch)
{
case 's':
srpthread_suspend();
break;
case 'r':
srpthread_resume();
break;
default:
break;
}
}
#if 0
printf("1111\n");
srpthread_resume();
printf("2222\n");
sleep(3);
printf("3333\n");
srpthread_suspend();
printf("4444\n");
#endif
return 1;
}