跨平台的EVENT事件 windows linux（转）

#ifndef _HIK_EVENT_H_
#define _HIK_EVENT_H_  

#ifdef _MSC_VER
#include <Windows.h>
#define hik_event_handle HANDLE
#else
#include <pthread.h>
typedef struct
{
    bool state;
    bool manual_reset;
    pthread_mutex_t mutex;
    pthread_cond_t cond;
}event_t;
#define event_handle event_t*
#endif  

//返回值：NULL 出错
event_handle event_create(bool manual_reset, bool init_state);  

//返回值：0 等到事件，-1出错
int event_wait(event_handle hevent);  

//返回值：0 等到事件，1 超时，-1出错
int event_timedwait(event_handle hevent, long milliseconds);  

//返回值：0 成功，-1出错
int event_set(event_handle hevent);  

//返回值：0 成功，-1出错
int event_reset(event_handle hevent);  

//返回值：无
void event_destroy(event_handle hevent);  

#endif  

////////////
<pre class="cpp" name="code">#include "event.h"
#ifdef __linux
#include <sys/time.h>
#include <errno.h>
#endif
#include <iostream>
event_handle event_create(bool manual_reset, bool init_state)
{
#ifdef _MSC_VER
    HANDLE hevent = CreateEvent(NULL, manual_reset, init_state, NULL);
#else
    event_handle hevent = new(std::nothrow) event_t;
    if (hevent == NULL)
    {
        return NULL;
    }
    hevent->state = init_state;
    hevent->manual_reset = manual_reset;
    if (pthread_mutex_init(&hevent->mutex, NULL))
    {
        delete hevent;
        return NULL;
    }
    if (pthread_cond_init(&hevent->cond, NULL))
    {
        pthread_mutex_destroy(&hevent->mutex);
        delete hevent;
        return NULL;
    }
#endif
    return hevent;
}
int event_wait(event_handle hevent)
{
#ifdef _MSC_VER
    DWORD ret = WaitForSingleObject(hevent, INFINITE);
    if (ret == WAIT_OBJECT_0)
    {
        return ;
    }
    return -;
#else
    if (pthread_mutex_lock(&hevent->mutex))
    {
        return -;
    }
    while (!hevent->state)
    {
        if (pthread_cond_wait(&hevent->cond, &hevent->mutex))
        {
            pthread_mutex_unlock(&hevent->mutex);
            return -;
        }
    }
    if (!hevent->manual_reset)
    {
        hevent->state = false;
    }
    if (pthread_mutex_unlock(&hevent->mutex))
    {
        return -;
    }
    return ;
#endif
}
int event_timedwait(event_handle hevent, long milliseconds)
{
#ifdef _MSC_VER
    DWORD ret = WaitForSingleObject(hevent, milliseconds);
    if (ret == WAIT_OBJECT_0)
    {
        return ;
    }
    if (ret == WAIT_TIMEOUT)
    {
        return ;
    }
    return -;
#else  

    int rc = ;
    struct timespec abstime;
    struct timeval tv;
    gettimeofday(&tv, NULL);
    abstime.tv_sec  = tv.tv_sec + milliseconds / ;
    abstime.tv_nsec = tv.tv_usec* + (milliseconds % )*;
    if (abstime.tv_nsec >= )
    {
        abstime.tv_nsec -= ;
        abstime.tv_sec++;
    }     

    if (pthread_mutex_lock(&hevent->mutex) != )
    {
        return -;
    }
    while (!hevent->state)
    {
        if (rc = pthread_cond_timedwait(&hevent->cond, &hevent->mutex, &abstime))
        {
            if (rc == ETIMEDOUT) break;
            pthread_mutex_unlock(&hevent->mutex);
            return -;
        }
    }
    if (rc ==  && !hevent->manual_reset)
    {
        hevent->state = false;
    }
    if (pthread_mutex_unlock(&hevent->mutex) != )
    {
        return -;
    }
    if (rc == ETIMEDOUT)
    {
        //timeout return 1
        return ;
    }
    //wait event success return 0
    return ;
#endif
}
int event_set(event_handle hevent)
{
#ifdef _MSC_VER
    return !SetEvent(hevent);
#else
    if (pthread_mutex_lock(&hevent->mutex) != )
    {
        return -;
    }  

    hevent->state = true;  

    if (hevent->manual_reset)
    {
        if(pthread_cond_broadcast(&hevent->cond))
        {
            return -;
        }
    }
    else
    {
        if(pthread_cond_signal(&hevent->cond))
        {
            return -;
        }
    }  

    if (pthread_mutex_unlock(&hevent->mutex) != )
    {
        return -;
    }  

    return ;
#endif
}
int event_reset(event_handle hevent)
{
#ifdef _MSC_VER
    //ResetEvent 返回非零表示成功
    if (ResetEvent(hevent))
    {
        return ;
    }
    return -;
#else
    if (pthread_mutex_lock(&hevent->mutex) != )
    {
        return -;
    }  

    hevent->state = false;  

    if (pthread_mutex_unlock(&hevent->mutex) != )
    {
        return -;
    }
    return ;
#endif
}
void event_destroy(event_handle hevent)
{
#ifdef _MSC_VER
    CloseHandle(hevent);
#else
    pthread_cond_destroy(&hevent->cond);
    pthread_mutex_destroy(&hevent->mutex);
    delete hevent;
#endif
}