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implement event wait timeouts in win32

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This commit is contained in:
Glenn Maynard
2005-01-27 01:54:33 +00:00
parent 903aaadcc5
commit 8bf00eb4e8
1 changed files with 35 additions and 8 deletions
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stepmania/src/arch/Threads/Threads_Win32.cpp
+35 -8
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@@ -2,6 +2,7 @@
#include "Threads_Win32.h"
#include "RageUtil.h"
#include "RageThreads.h"
#include "RageTimer.h"
const int MAX_THREADS=128;
@@ -278,16 +279,16 @@ EventImpl_Win32::~EventImpl_Win32()
* we don't guarantee or depend upon fair events, and SignalObjectAndWait is only
* available in NT. I also can't find a single function to signal an object like
* SignalObjectAndWait, so we need to know if the object is a mutex or an event. */
static void PortableSignalObjectAndWait( HANDLE hObjectToSignal, HANDLE hObjectToWaitOn, bool bFirstParamIsMutex )
static bool PortableSignalObjectAndWait( HANDLE hObjectToSignal, HANDLE hObjectToWaitOn, bool bFirstParamIsMutex, unsigned iMilliseconds = INFINITE )
{
static bool bSignalObjectAndWaitUnavailable = false;
if( !bSignalObjectAndWaitUnavailable )
{
DWORD ret = SignalObjectAndWait( hObjectToSignal, hObjectToWaitOn, INFINITE, false );
DWORD ret = SignalObjectAndWait( hObjectToSignal, hObjectToWaitOn, iMilliseconds, false );
switch( ret )
{
case WAIT_OBJECT_0:
return;
return true;
case WAIT_ABANDONED:
/* The docs aren't particular about what this does, but it should never happen. */
@@ -303,6 +304,9 @@ static void PortableSignalObjectAndWait( HANDLE hObjectToSignal, HANDLE hObjectT
FAIL_M( werr_ssprintf(GetLastError(), "SignalObjectAndWait") );
case WAIT_TIMEOUT:
return false;
default:
FAIL_M( "unknown" );
}
@@ -317,7 +321,22 @@ static void PortableSignalObjectAndWait( HANDLE hObjectToSignal, HANDLE hObjectT
else
SetEvent( hObjectToSignal );
WaitForSingleObject( hObjectToWaitOn, INFINITE );
DWORD ret = WaitForSingleObject( hObjectToWaitOn, iMilliseconds );
switch( ret )
{
case WAIT_OBJECT_0:
return true;
case WAIT_ABANDONED:
/* The docs aren't particular about what this does, but it should never happen. */
FAIL_M( "WAIT_ABANDONED" );
case WAIT_TIMEOUT:
return false;
default:
FAIL_M( "unknown" );
}
}
/* Event logic from http://www.cs.wustl.edu/~schmidt/win32-cv-1.html.
@@ -328,21 +347,29 @@ bool EventImpl_Win32::Wait( RageTimer *pTimeout )
++m_iNumWaiting;
LeaveCriticalSection( &m_iNumWaitingLock );
unsigned iMilliseconds = INFINITE;
if( pTimeout != NULL )
{
float fSecondsInFuture = -pTimeout->Ago();
iMilliseconds = (unsigned) max( 0, int( fSecondsInFuture * 1000 ) );
}
/* Unlock the mutex and wait for a signal. */
PortableSignalObjectAndWait( m_pParent->mutex, m_WakeupSema, true );
bool bSuccess = PortableSignalObjectAndWait( m_pParent->mutex, m_WakeupSema, true, iMilliseconds );
EnterCriticalSection( &m_iNumWaitingLock );
--m_iNumWaiting;
bool bLastWaiting = m_iNumWaiting == 0;
LeaveCriticalSection( &m_iNumWaitingLock );
/* If we're the last waiter to wake up, wake up the signaller. */
if( bLastWaiting )
/* If we're the last waiter to wake up, and we were actually woken by another
* thread (not by timeout), wake up the signaller. */
if( bLastWaiting && bSuccess )
PortableSignalObjectAndWait( m_WaitersDone, m_pParent->mutex, false );
else
WaitForSingleObject( m_pParent->mutex, INFINITE );
return true;
return bSuccess;
}
void EventImpl_Win32::Signal()