跨平台的EVENT事件 windows linux

Posted 2020-09-28 DoubleLi

#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 0;
    }
    return -1;
#else
    if (pthread_mutex_lock(&hevent->mutex))   
    {      
        return -1;   
    }   
    while (!hevent->state)    
    {      
        if (pthread_cond_wait(&hevent->cond, &hevent->mutex))   
        {   
            pthread_mutex_unlock(&hevent->mutex); 
            return -1;   
        }   
    }   
    if (!hevent->manual_reset) 
    {
        hevent->state = false;
    }
    if (pthread_mutex_unlock(&hevent->mutex))   
    {     
        return -1;   
    }  
    return 0;
#endif
}
int event_timedwait(event_handle hevent, long milliseconds)
{
#ifdef _MSC_VER
    DWORD ret = WaitForSingleObject(hevent, milliseconds);
    if (ret == WAIT_OBJECT_0)
    {
        return 0;
    }
    if (ret == WAIT_TIMEOUT)
    {
        return 1;
    }
    return -1;
#else

    int rc = 0;   
    struct timespec abstime;   
    struct timeval tv;   
    gettimeofday(&tv, NULL);   
    abstime.tv_sec  = tv.tv_sec + milliseconds / 1000;   
    abstime.tv_nsec = tv.tv_usec*1000 + (milliseconds % 1000)*1000000;   
    if (abstime.tv_nsec >= 1000000000)   
    {   
        abstime.tv_nsec -= 1000000000;   
        abstime.tv_sec++;   
    }   

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

    hevent->state = true;

    if (hevent->manual_reset)
    {
        if(pthread_cond_broadcast(&hevent->cond))
        {
            return -1;
        }
    }
    else
    {
        if(pthread_cond_signal(&hevent->cond))
        {
            return -1;
        }
    }

    if (pthread_mutex_unlock(&hevent->mutex) != 0)
    {
        return -1;
    }

    return 0;
#endif
}
int event_reset(event_handle hevent) 
{
#ifdef _MSC_VER
    //ResetEvent 返回非零表示成功
    if (ResetEvent(hevent))
    {
        return 0;
    } 
    return -1;
#else
    if (pthread_mutex_lock(&hevent->mutex) != 0)
    {
        return -1;
    }

    hevent->state = false;

    if (pthread_mutex_unlock(&hevent->mutex) != 0)
    {      
        return -1;
    }
    return 0;
#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
}