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#include "conditional.h"
namespace AsuraEngine
{
namespace Threading
{
Conditional::Conditional()
: mWaiting(0)
, mSignals(0)
{
}
Conditional::~Conditional()
{
}
void Conditional::Signal()
{
mMutex.Lock();
if (mWaiting > mSignals)
{
++mSignals;
signal(mWaitSem);
mMutex.Unlock();
wait(mDoneSem);
}
else
{
mMutex.Unlock();
}
}
void Conditional::Broadcast()
{
mMutex.Lock();
if (mWaiting> mSignals) {
int i, num_waiting;
num_waiting = (mWaiting - mSignals);
mSignals = mWaiting;
for (i = 0; i < num_waiting; ++i) {
signal(mWaitSem);
}
mMutex.Unlock();
for (i = 0; i < num_waiting; ++i) {
wait(mDoneSem);
}
}
else {
mMutex.Unlock();
}
}
bool Conditional::Wait(Mutex* mutex, int timeout /*= ASURA_MUTEX_MAXWAIT*/)
{
bool retval;
mMutex.Lock();
++mWaiting;
mMutex.Unlock();
mutex->Unlock();
retval = wait(mWaitSem, timeout);
mMutex.Lock();
if (mSignals > 0) {
if (!retval) {
wait(mWaitSem);
}
signal(mDoneSem);
--mSignals;
}
--mWaiting;
mMutex.Unlock();
mMutex.Lock();
return retval;
}
}
}
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