将Windows手动重置事件移植到Linux吗? [英] Porting windows manual-reset event to Linux?

问题描述

将Windows手动重置事件移植到pthread是否有更简单的解决方案， 比一个pthread条件变量+ pthread互斥锁+一个标志(如果设置或未设置事件)?

Is there any easier solution in porting a windows manual-reset event to pthread, than a pthread conditional-variable + pthread mutex + a flag if event is set or unset?

推荐答案

Pthread是低级构造.不，没有更简单的机制. pthread_cond__*在概念上类似于自动重置事件.请注意，pthread_cond_wait可能会有虚假的唤醒，因此无论情况如何，都不要在没有某种外部标志的情况下使用它.

Pthreads are low level constructs. No, there isn't a simpler mechanism; pthread_cond__* is conceptually similar to an auto-reset event. Be careful, pthread_cond_wait may have spurious wakeups, so it should never be used without some sort of external flag regardless of the situation.

但是，构建自己的东西并不难.

Building your own wouldn't be too hard, though.

#include <pthread.h>
#include <stdbool.h>

struct mrevent {
    pthread_mutex_t mutex;
    pthread_cond_t cond;
    bool triggered;
};

void mrevent_init(struct mrevent *ev) {
    pthread_mutex_init(&ev->mutex, 0);
    pthread_cond_init(&ev->cond, 0);
    ev->triggered = false;
}

void mrevent_trigger(struct mrevent *ev) {
    pthread_mutex_lock(&ev->mutex);
    ev->triggered = true;
    pthread_cond_signal(&ev->cond);
    pthread_mutex_unlock(&ev->mutex);
}

void mrevent_reset(struct mrevent *ev) {
    pthread_mutex_lock(&ev->mutex);
    ev->triggered = false;
    pthread_mutex_unlock(&ev->mutex);
}

void mrevent_wait(struct mrevent *ev) {
     pthread_mutex_lock(&ev->mutex);
     while (!ev->triggered)
         pthread_cond_wait(&ev->cond, &ev->mutex);
     pthread_mutex_unlock(&ev->mutex);
}

这可能不适合您的用法，因为您通常会想使用其他锁来代替ev->mutex，但这是通常使用它的要旨.

This may not fit your usage, as you will often have a different lock that you'd want to use in place of ev->mutex, but this is the gist of how it's typically used.

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