semobject.cpp

来自「C++封装的视频采集代码」· C++ 代码 · 共 51 行

/*
    Semaphore Object wrapper
*/


#include "SemObject.h"

SemObject::SemObject()
{
	initialized = false;
}

SemObject::~SemObject()
{
	if (initialized)
		sem_destroy(&sem);
}

int SemObject::Init(int shared, unsigned int value)
{
	if (initialized)
		return ERR_SEM_OBJECT_ALREADYINIT;
	sem_init(&sem, shared, value);
	initialized = true;
	return 0;	
}

int SemObject::Wait()
{
	if (!initialized)
		return ERR_SEM_OBJECT_NOTINIT;
		
	return sem_wait(&sem);
}

int SemObject::Post()
{
	if (!initialized)
		return ERR_SEM_OBJECT_NOTINIT;
	
	return sem_post(&sem);
}

int SemObject::Try()
{
	if (!initialized)
		return ERR_SEM_OBJECT_NOTINIT;
	
	return sem_trywait(&sem);
}