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