linux 线程挂起恢复的简单示例

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 #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;
 }