Sweden-Number/scheduler/critsection.c

243 lines
7.2 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 )
{
BOOL ret = FALSE;
if (InterlockedCompareExchange( (PVOID *)&crit->LockCount,
(PVOID)0L, (PVOID)-1L ) == (PVOID)-1L)
{
crit->OwningThread = GetCurrentThreadId();
crit->RecursionCount = 1;
ret = TRUE;
}
else if (crit->OwningThread == GetCurrentThreadId())
{
InterlockedIncrement( &crit->LockCount );
crit->RecursionCount++;
ret = TRUE;
}
return ret;
}
/***********************************************************************
* 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() );
}
}
#ifdef __i386__
PVOID WINAPI InterlockedCompareExchange( PVOID *dest, PVOID xchg, PVOID compare );
__ASM_GLOBAL_FUNC(InterlockedCompareExchange,
"movl 12(%esp),%eax\n\t"
"movl 8(%esp),%ecx\n\t"
"movl 4(%esp),%edx\n\t"
"lock; cmpxchgl %ecx,(%edx)\n\t"
"ret $12");
LONG WINAPI InterlockedExchange( PLONG dest, LONG val );
__ASM_GLOBAL_FUNC(InterlockedExchange,
"movl 8(%esp),%eax\n\t"
"movl 4(%esp),%edx\n\t"
"lock; xchgl %eax,(%edx)\n\t"
"ret $8");
LONG WINAPI InterlockedExchangeAdd( PLONG dest, LONG incr );
__ASM_GLOBAL_FUNC(InterlockedExchangeAdd,
"movl 8(%esp),%eax\n\t"
"movl 4(%esp),%edx\n\t"
"lock; xaddl %eax,(%edx)\n\t"
"ret $8");
LONG WINAPI InterlockedIncrement( PLONG dest );
__ASM_GLOBAL_FUNC(InterlockedIncrement,
"movl 4(%esp),%edx\n\t"
"movl $1,%eax\n\t"
"lock; xaddl %eax,(%edx)\n\t"
"incl %eax\n\t"
"ret $4");
LONG WINAPI InterlockedDecrement( PLONG dest );
__ASM_GLOBAL_FUNC(InterlockedDecrement,
"movl 4(%esp),%edx\n\t"
"movl $-1,%eax\n\t"
"lock; xaddl %eax,(%edx)\n\t"
"decl %eax\n\t"
"ret $4");
#else /* __i386__ */
#error You must implement the Interlocked* functions for your CPU
#endif /* __i386__ */