linux中线程的挂起与恢复（进程暂停）

今天在网上查了一下linux中对进程的挂起与恢复的实现，相关资料少的可怜，大部分都是粘贴复制。也没有完整详细的代码。故自己整理了一下

程序流程为：主线程创建子线程（当前子线程状态为stop停止状态），5秒后主线程唤醒子线程，10秒后主线程挂起子线程，15秒后主线程再次唤醒子线程，20秒后主线程执行完毕等待子线程退出。

代码如下：

#include

#include

#include

#include

#include

#define RUN 1

#define STOP 0

pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER;

pthread_cond_t cond = PTHREAD_COND_INITIALIZER;

int status = STOP;

void * thread_function(void)

{

    static int i = 0;

    while (1) 

    {   

        pthread_mutex_lock(&mut);

        while (!status)

        {

            pthread_cond_wait(&cond, &mut);

        }

        pthread_mutex_unlock(&mut);

    

        printf("child pthread %d\n", i++);

        if (i == 20) 

            break;

        sleep(1);

    }   

}

void thread_resume()

{

    if (status == STOP)

    {   

        pthread_mutex_lock(&mut);

        status = RUN;

        pthread_cond_signal(&cond);

        printf("pthread run!\n");

        pthread_mutex_unlock(&mut);

    }   

    else

    {   

        printf("pthread run already\n");

    }   

}

void thread_pause()

{

    if (status == RUN)

    {   

        pthread_mutex_lock(&mut);

        status = STOP;

        printf("thread stop!\n");

        pthread_mutex_unlock(&mut);

    }   

    else

    {   

        printf("pthread pause already\n");

    }

}

int main()

{

    int err;

    static int i = 0;

    pthread_t child_thread;

#if 0

    if (pthread_mutex_init(&mut, NULL) != 0)

        printf("mutex init error\n");

    if (pthread_cond_init(&cond, NULL) != 0)

        printf("cond init error\n");

#endif

    err = pthread_create(&child_thread, NULL, (void *)thread_function, NULL);

    if (err != 0 )

        printf("can't create thread: %s\n", strerror(err));

    while(1)

    {

        printf("father pthread %d\n", i++);

        sleep(1);

        if (i == 5)

            thread_resume();

        if (i == 10)

            thread_pause();

        if (i == 15)

            thread_resume();

        if (i == 20)

            break;

    }

    if (0 == pthread_join(child_thread, NULL))

        printf("child thread is over\n");

    return 0;

}