Sweden-Number/scheduler/critsection.c

199 lines
5.7 KiB
C

/*
* Win32 critical sections
*
* Copyright 1998 Alexandre Julliard
*/
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include "winerror.h"
#include "winbase.h"
#include "ntddk.h"
#include "heap.h"
#include "debugtools.h"
#include "thread.h"
DEFAULT_DEBUG_CHANNEL(win32)
DECLARE_DEBUG_CHANNEL(relay)
/***********************************************************************
* InitializeCriticalSection (KERNEL32.472) (NTDLL.406)
*/
void WINAPI InitializeCriticalSection( CRITICAL_SECTION *crit )
{
crit->LockCount = -1;
crit->RecursionCount = 0;
crit->OwningThread = 0;
crit->LockSemaphore = CreateSemaphoreA( NULL, 0, 1, NULL );
crit->Reserved = GetCurrentProcessId();
}
/***********************************************************************
* DeleteCriticalSection (KERNEL32.185) (NTDLL.327)
*/
void WINAPI DeleteCriticalSection( CRITICAL_SECTION *crit )
{
if (crit->LockSemaphore)
{
if (crit->RecursionCount) /* Should not happen */
ERR("Deleting owned critical section (%p)\n", crit );
crit->LockCount = -1;
crit->RecursionCount = 0;
crit->OwningThread = 0;
CloseHandle( crit->LockSemaphore );
crit->LockSemaphore = 0;
crit->Reserved = (DWORD)-1;
}
}
/***********************************************************************
* EnterCriticalSection (KERNEL32.195) (NTDLL.344)
*/
void WINAPI EnterCriticalSection( CRITICAL_SECTION *crit )
{
DWORD res;
if (!crit->LockSemaphore)
{
FIXME("entering uninitialized section(%p)?\n",crit);
InitializeCriticalSection(crit);
}
if ( crit->Reserved && crit->Reserved != GetCurrentProcessId() )
{
FIXME("Crst %p belongs to process %ld, current is %ld!\n",
crit, crit->Reserved, GetCurrentProcessId() );
return;
}
if (InterlockedIncrement( &crit->LockCount ))
{
if (crit->OwningThread == GetCurrentThreadId())
{
crit->RecursionCount++;
return;
}
/* Now wait for it */
for (;;)
{
EXCEPTION_RECORD rec;
res = WaitForSingleObject( crit->LockSemaphore, 5000L );
if ( res == WAIT_TIMEOUT )
{
ERR("Critical section %p wait timed out, retrying (60 sec)\n", crit );
res = WaitForSingleObject( crit->LockSemaphore, 60000L );
if ( res == WAIT_TIMEOUT && TRACE_ON(relay) )
{
ERR("Critical section %p wait timed out, retrying (5 min)\n", crit );
res = WaitForSingleObject( crit->LockSemaphore, 300000L );
}
}
if (res == STATUS_WAIT_0) break;
rec.ExceptionCode = EXCEPTION_CRITICAL_SECTION_WAIT;
rec.ExceptionFlags = 0;
rec.ExceptionRecord = NULL;
rec.ExceptionAddress = RtlRaiseException; /* sic */
rec.NumberParameters = 1;
rec.ExceptionInformation[0] = (DWORD)crit;
RtlRaiseException( &rec );
}
}
crit->OwningThread = GetCurrentThreadId();
crit->RecursionCount = 1;
}
/***********************************************************************
* TryEnterCriticalSection (KERNEL32.898) (NTDLL.969)
*/
BOOL WINAPI TryEnterCriticalSection( CRITICAL_SECTION *crit )
{
if (InterlockedIncrement( &crit->LockCount ))
{
if (crit->OwningThread == GetCurrentThreadId())
{
crit->RecursionCount++;
return TRUE;
}
/* FIXME: this doesn't work */
InterlockedDecrement( &crit->LockCount );
return FALSE;
}
crit->OwningThread = GetCurrentThreadId();
crit->RecursionCount = 1;
return TRUE;
}
/***********************************************************************
* LeaveCriticalSection (KERNEL32.494) (NTDLL.426)
*/
void WINAPI LeaveCriticalSection( CRITICAL_SECTION *crit )
{
if (crit->OwningThread != GetCurrentThreadId()) return;
if (--crit->RecursionCount)
{
InterlockedDecrement( &crit->LockCount );
return;
}
crit->OwningThread = 0;
if (InterlockedDecrement( &crit->LockCount ) >= 0)
{
/* Someone is waiting */
ReleaseSemaphore( crit->LockSemaphore, 1, NULL );
}
}
/***********************************************************************
* MakeCriticalSectionGlobal (KERNEL32.515)
*/
void WINAPI MakeCriticalSectionGlobal( CRITICAL_SECTION *crit )
{
crit->LockSemaphore = ConvertToGlobalHandle( crit->LockSemaphore );
crit->Reserved = 0L;
}
/***********************************************************************
* ReinitializeCriticalSection (KERNEL32.581)
*/
void WINAPI ReinitializeCriticalSection( CRITICAL_SECTION *crit )
{
if ( !crit->LockSemaphore )
InitializeCriticalSection( crit );
else if ( crit->Reserved && crit->Reserved != GetCurrentProcessId() )
{
FIXME("(%p) called for %08lx first, %08lx now: making global\n",
crit, crit->Reserved, GetCurrentProcessId() );
MakeCriticalSectionGlobal( crit );
}
}
/***********************************************************************
* UninitializeCriticalSection (KERNEL32.703)
*/
void WINAPI UninitializeCriticalSection( CRITICAL_SECTION *crit )
{
if ( crit->LockSemaphore )
{
if ( crit->Reserved ) /* not global */
DeleteCriticalSection( crit );
else
FIXME("(%p) for %08lx: Crst is global, don't know whether to delete\n",
crit, GetCurrentProcessId() );
}
}