wxMutexError wxMutexInternal::Unlock()
{
if ( UMASystemIsInitialized() )
{
OSErr err;
err = ::ThreadBeginCritical();
wxASSERT( err == noErr ) ;
if (m_locked > 0)
m_locked--;
// this mutex is not owned by anybody anmore
m_owner = kNoThreadID;
// now pass on to the first waiting thread
ThreadID firstWaiting = kNoThreadID;
bool found = false;
while (!m_waiters.IsEmpty() && !found)
{
firstWaiting = m_waiters[0];
err = ::SetThreadState(firstWaiting, kReadyThreadState, kNoThreadID);
// in case this was not successful (dead thread), we just loop on and reset the id
found = (err != threadNotFoundErr);
if ( !found )
firstWaiting = kNoThreadID ;
m_waiters.RemoveAt(0) ;
}
// now we have a valid firstWaiting thread, which has been scheduled to run next, just end the
// critical section and invoke the scheduler
err = ::SetThreadStateEndCritical(kCurrentThreadID, kReadyThreadState, firstWaiting);
}
else
{
if (m_locked > 0)
m_locked--;
}
return wxMUTEX_NO_ERROR;
}
