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#include "Semaphore.h"
namespace TNet {
Semaphore::
Semaphore(int initValue)
{
mSemValue = initValue;
pthread_mutex_init(&mMutex, NULL);
pthread_cond_init(&mCond, NULL);
}
Semaphore::
~Semaphore()
{
pthread_mutex_destroy(&mMutex);
pthread_cond_destroy(&mCond);
}
int
Semaphore::
TryWait()
{
pthread_mutex_lock(&mMutex);
if(mSemValue > 0) {
mSemValue--;
pthread_mutex_unlock(&mMutex);
return 0;
}
pthread_mutex_unlock(&mMutex);
return -1;
}
void
Semaphore::
Wait()
{
pthread_mutex_lock(&mMutex);
while(mSemValue <= 0) {
pthread_cond_wait(&mCond, &mMutex);
}
mSemValue--;
pthread_mutex_unlock(&mMutex);
}
void
Semaphore::
Post()
{
pthread_mutex_lock(&mMutex);
mSemValue++;
pthread_cond_signal(&mCond);
pthread_mutex_unlock(&mMutex);
}
int
Semaphore::
GetValue()
{ return mSemValue; }
} //namespace
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