Sweden-Number/scheduler/critsection.c

137 lines
3.7 KiB
C

/*
* Win32 critical sections
*
* Copyright 1998 Alexandre Julliard
*/
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include "debug.h"
#include "winerror.h"
#include "winbase.h"
#include "heap.h"
#include "debug.h"
#include "thread.h"
/***********************************************************************
* InitializeCriticalSection (KERNEL32.472) (NTDLL.406)
*/
void WINAPI InitializeCriticalSection( CRITICAL_SECTION *crit )
{
crit->LockCount = -1;
crit->RecursionCount = 0;
crit->OwningThread = 0;
crit->LockSemaphore = 0;
crit->LockSemaphore = CreateSemaphoreA( NULL, 0, 1, NULL );
crit->Reserved = (DWORD)-1;
}
/***********************************************************************
* DeleteCriticalSection (KERNEL32.185) (NTDLL.327)
*/
void WINAPI DeleteCriticalSection( CRITICAL_SECTION *crit )
{
if (crit->LockSemaphore)
{
if (crit->RecursionCount) /* Should not happen */
MSG("Deleting owned critical section (%p)\n", crit );
crit->LockCount = -1;
crit->RecursionCount = 0;
crit->OwningThread = 0;
CloseHandle( crit->LockSemaphore );
crit->LockSemaphore = 0;
}
}
/***********************************************************************
* EnterCriticalSection (KERNEL32.195) (NTDLL.344)
*/
void WINAPI EnterCriticalSection( CRITICAL_SECTION *crit )
{
if (!crit->LockSemaphore)
{
FIXME(win32,"entering uninitialized section(%p)?\n",crit);
InitializeCriticalSection(crit);
}
if (InterlockedIncrement( &crit->LockCount ))
{
if (crit->OwningThread == GetCurrentThreadId())
{
crit->RecursionCount++;
return;
}
/* Now wait for it */
/* FIXME: should set a timeout and raise an exception */
WaitForSingleObject( crit->LockSemaphore, INFINITE );
}
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 );
}
/***********************************************************************
* ReinitializeCriticalSection (KERNEL32.581)
*/
void WINAPI ReinitializeCriticalSection( CRITICAL_SECTION *crit )
{
DeleteCriticalSection( crit );
InitializeCriticalSection( crit );
}