mirror of
git://source.winehq.org/git/wine.git
synced 2024-11-05 18:01:34 +00:00
415 lines
13 KiB
C
415 lines
13 KiB
C
/*
|
|
* Win32 critical sections
|
|
*
|
|
* Copyright 1998 Alexandre Julliard
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include "config.h"
|
|
#include "wine/port.h"
|
|
|
|
#include <assert.h>
|
|
#include <stdarg.h>
|
|
#include <stdio.h>
|
|
#include <sys/types.h>
|
|
#include "windef.h"
|
|
#include "winternl.h"
|
|
#include "wine/debug.h"
|
|
#include "ntdll_misc.h"
|
|
|
|
WINE_DEFAULT_DEBUG_CHANNEL(ntdll);
|
|
WINE_DECLARE_DEBUG_CHANNEL(relay);
|
|
|
|
inline static LONG interlocked_inc( PLONG dest )
|
|
{
|
|
return interlocked_xchg_add( dest, 1 ) + 1;
|
|
}
|
|
|
|
inline static LONG interlocked_dec( PLONG dest )
|
|
{
|
|
return interlocked_xchg_add( dest, -1 ) - 1;
|
|
}
|
|
|
|
inline static void small_pause(void)
|
|
{
|
|
#ifdef __i386__
|
|
__asm__ __volatile__( "rep;nop" : : : "memory" );
|
|
#else
|
|
__asm__ __volatile__( "" : : : "memory" );
|
|
#endif
|
|
}
|
|
|
|
/***********************************************************************
|
|
* get_semaphore
|
|
*/
|
|
static inline HANDLE get_semaphore( RTL_CRITICAL_SECTION *crit )
|
|
{
|
|
HANDLE ret = crit->LockSemaphore;
|
|
if (!ret)
|
|
{
|
|
HANDLE sem;
|
|
if (NtCreateSemaphore( &sem, SEMAPHORE_ALL_ACCESS, NULL, 0, 1 )) return 0;
|
|
if (!(ret = (HANDLE)interlocked_cmpxchg_ptr( (PVOID *)&crit->LockSemaphore,
|
|
(PVOID)sem, 0 )))
|
|
ret = sem;
|
|
else
|
|
NtClose(sem); /* somebody beat us to it */
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* RtlInitializeCriticalSection (NTDLL.@)
|
|
*
|
|
* Initialises a new critical section.
|
|
*
|
|
* PARAMS
|
|
* crit [O] Critical section to initialise
|
|
*
|
|
* RETURNS
|
|
* STATUS_SUCCESS.
|
|
*
|
|
* SEE
|
|
* RtlInitializeCriticalSectionAndSpinCount(), RtlDeleteCriticalSection(),
|
|
* RtlEnterCriticalSection(), RtlLeaveCriticalSection(),
|
|
* RtlTryEnterCriticalSection(), RtlSetCriticalSectionSpinCount()
|
|
*/
|
|
NTSTATUS WINAPI RtlInitializeCriticalSection( RTL_CRITICAL_SECTION *crit )
|
|
{
|
|
return RtlInitializeCriticalSectionAndSpinCount( crit, 0 );
|
|
}
|
|
|
|
/***********************************************************************
|
|
* RtlInitializeCriticalSectionAndSpinCount (NTDLL.@)
|
|
*
|
|
* Initialises a new critical section with a given spin count.
|
|
*
|
|
* PARAMS
|
|
* crit [O] Critical section to initialise
|
|
* spincount [I] Spin count for crit
|
|
*
|
|
* RETURNS
|
|
* STATUS_SUCCESS.
|
|
*
|
|
* NOTES
|
|
* Available on NT4 SP3 or later.
|
|
*
|
|
* SEE
|
|
* RtlInitializeCriticalSection(), RtlDeleteCriticalSection(),
|
|
* RtlEnterCriticalSection(), RtlLeaveCriticalSection(),
|
|
* RtlTryEnterCriticalSection(), RtlSetCriticalSectionSpinCount()
|
|
*/
|
|
NTSTATUS WINAPI RtlInitializeCriticalSectionAndSpinCount( RTL_CRITICAL_SECTION *crit, ULONG spincount )
|
|
{
|
|
crit->DebugInfo = RtlAllocateHeap(GetProcessHeap(), 0, sizeof(RTL_CRITICAL_SECTION_DEBUG));
|
|
if (crit->DebugInfo)
|
|
{
|
|
crit->DebugInfo->Type = 0;
|
|
crit->DebugInfo->CreatorBackTraceIndex = 0;
|
|
crit->DebugInfo->CriticalSection = crit;
|
|
crit->DebugInfo->ProcessLocksList.Blink = &(crit->DebugInfo->ProcessLocksList);
|
|
crit->DebugInfo->ProcessLocksList.Flink = &(crit->DebugInfo->ProcessLocksList);
|
|
crit->DebugInfo->EntryCount = 0;
|
|
crit->DebugInfo->ContentionCount = 0;
|
|
crit->DebugInfo->Spare[0] = 0;
|
|
crit->DebugInfo->Spare[1] = 0;
|
|
}
|
|
crit->LockCount = -1;
|
|
crit->RecursionCount = 0;
|
|
crit->OwningThread = 0;
|
|
crit->LockSemaphore = 0;
|
|
if (NtCurrentTeb()->Peb->NumberOfProcessors <= 1) spincount = 0;
|
|
crit->SpinCount = spincount & ~0x80000000;
|
|
return STATUS_SUCCESS;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* RtlSetCriticalSectionSpinCount (NTDLL.@)
|
|
*
|
|
* Sets the spin count of a critical section.
|
|
*
|
|
* PARAMS
|
|
* crit [I/O] Critical section
|
|
* spincount [I] Spin count for crit
|
|
*
|
|
* RETURNS
|
|
* The previous spin count.
|
|
*
|
|
* NOTES
|
|
* If the system is not SMP, spincount is ignored and set to 0.
|
|
*
|
|
* SEE
|
|
* RtlInitializeCriticalSection(), RtlInitializeCriticalSectionAndSpinCount(),
|
|
* RtlDeleteCriticalSection(), RtlEnterCriticalSection(),
|
|
* RtlLeaveCriticalSection(), RtlTryEnterCriticalSection()
|
|
*/
|
|
ULONG WINAPI RtlSetCriticalSectionSpinCount( RTL_CRITICAL_SECTION *crit, ULONG spincount )
|
|
{
|
|
ULONG oldspincount = crit->SpinCount;
|
|
if (NtCurrentTeb()->Peb->NumberOfProcessors <= 1) spincount = 0;
|
|
crit->SpinCount = spincount;
|
|
return oldspincount;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* RtlDeleteCriticalSection (NTDLL.@)
|
|
*
|
|
* Frees the resources used by a critical section.
|
|
*
|
|
* PARAMS
|
|
* crit [I/O] Critical section to free
|
|
*
|
|
* RETURNS
|
|
* STATUS_SUCCESS.
|
|
*
|
|
* SEE
|
|
* RtlInitializeCriticalSection(), RtlInitializeCriticalSectionAndSpinCount(),
|
|
* RtlDeleteCriticalSection(), RtlEnterCriticalSection(),
|
|
* RtlLeaveCriticalSection(), RtlTryEnterCriticalSection()
|
|
*/
|
|
NTSTATUS WINAPI RtlDeleteCriticalSection( RTL_CRITICAL_SECTION *crit )
|
|
{
|
|
crit->LockCount = -1;
|
|
crit->RecursionCount = 0;
|
|
crit->OwningThread = 0;
|
|
if (crit->LockSemaphore) NtClose( crit->LockSemaphore );
|
|
crit->LockSemaphore = 0;
|
|
if (crit->DebugInfo)
|
|
{
|
|
/* only free the ones we made in here */
|
|
if (!crit->DebugInfo->Spare[1])
|
|
{
|
|
RtlFreeHeap( GetProcessHeap(), 0, crit->DebugInfo );
|
|
crit->DebugInfo = NULL;
|
|
}
|
|
}
|
|
return STATUS_SUCCESS;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* RtlpWaitForCriticalSection (NTDLL.@)
|
|
*
|
|
* Waits for a busy critical section to become free.
|
|
*
|
|
* PARAMS
|
|
* crit [I/O] Critical section to wait for
|
|
*
|
|
* RETURNS
|
|
* STATUS_SUCCESS.
|
|
*
|
|
* NOTES
|
|
* Use RtlEnterCriticalSection() instead of this function as it is often much
|
|
* faster.
|
|
*
|
|
* SEE
|
|
* RtlInitializeCriticalSection(), RtlInitializeCriticalSectionAndSpinCount(),
|
|
* RtlDeleteCriticalSection(), RtlEnterCriticalSection(),
|
|
* RtlLeaveCriticalSection(), RtlTryEnterCriticalSection()
|
|
*/
|
|
NTSTATUS WINAPI RtlpWaitForCriticalSection( RTL_CRITICAL_SECTION *crit )
|
|
{
|
|
for (;;)
|
|
{
|
|
EXCEPTION_RECORD rec;
|
|
HANDLE sem = get_semaphore( crit );
|
|
LARGE_INTEGER time;
|
|
DWORD status;
|
|
|
|
time.QuadPart = -5000 * 10000; /* 5 seconds */
|
|
status = NtWaitForSingleObject( sem, FALSE, &time );
|
|
if ( status == STATUS_TIMEOUT )
|
|
{
|
|
const char *name = NULL;
|
|
if (crit->DebugInfo) name = (char *)crit->DebugInfo->Spare[1];
|
|
if (!name) name = "?";
|
|
ERR( "section %p %s wait timed out in thread %04lx, blocked by %04lx, retrying (60 sec)\n",
|
|
crit, debugstr_a(name), GetCurrentThreadId(), (DWORD)crit->OwningThread );
|
|
time.QuadPart = -60000 * 10000;
|
|
status = NtWaitForSingleObject( sem, FALSE, &time );
|
|
if ( status == STATUS_TIMEOUT && TRACE_ON(relay) )
|
|
{
|
|
ERR( "section %p %s wait timed out in thread %04lx, blocked by %04lx, retrying (5 min)\n",
|
|
crit, debugstr_a(name), GetCurrentThreadId(), (DWORD) crit->OwningThread );
|
|
time.QuadPart = -300000 * (ULONGLONG)10000;
|
|
status = NtWaitForSingleObject( sem, FALSE, &time );
|
|
}
|
|
}
|
|
if (status == STATUS_WAIT_0) return STATUS_SUCCESS;
|
|
|
|
/* Throw exception only for Wine internal locks */
|
|
if ((!crit->DebugInfo) || (!crit->DebugInfo->Spare[1])) continue;
|
|
|
|
rec.ExceptionCode = STATUS_POSSIBLE_DEADLOCK;
|
|
rec.ExceptionFlags = 0;
|
|
rec.ExceptionRecord = NULL;
|
|
rec.ExceptionAddress = RtlRaiseException; /* sic */
|
|
rec.NumberParameters = 1;
|
|
rec.ExceptionInformation[0] = (ULONG_PTR)crit;
|
|
RtlRaiseException( &rec );
|
|
}
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* RtlpUnWaitCriticalSection (NTDLL.@)
|
|
*
|
|
* Notifies other threads waiting on the busy critical section that it has
|
|
* become free.
|
|
*
|
|
* PARAMS
|
|
* crit [I/O] Critical section
|
|
*
|
|
* RETURNS
|
|
* Success: STATUS_SUCCESS.
|
|
* Failure: Any error returned by NtReleaseSemaphore()
|
|
*
|
|
* NOTES
|
|
* Use RtlLeaveCriticalSection() instead of this function as it is often much
|
|
* faster.
|
|
*
|
|
* SEE
|
|
* RtlInitializeCriticalSection(), RtlInitializeCriticalSectionAndSpinCount(),
|
|
* RtlDeleteCriticalSection(), RtlEnterCriticalSection(),
|
|
* RtlLeaveCriticalSection(), RtlTryEnterCriticalSection()
|
|
*/
|
|
NTSTATUS WINAPI RtlpUnWaitCriticalSection( RTL_CRITICAL_SECTION *crit )
|
|
{
|
|
HANDLE sem = get_semaphore( crit );
|
|
NTSTATUS res = NtReleaseSemaphore( sem, 1, NULL );
|
|
if (res) RtlRaiseStatus( res );
|
|
return res;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* RtlEnterCriticalSection (NTDLL.@)
|
|
*
|
|
* Enters a critical section, waiting for it to become available if necessary.
|
|
*
|
|
* PARAMS
|
|
* crit [I/O] Critical section to enter
|
|
*
|
|
* RETURNS
|
|
* STATUS_SUCCESS. The critical section is held by the caller.
|
|
*
|
|
* SEE
|
|
* RtlInitializeCriticalSection(), RtlInitializeCriticalSectionAndSpinCount(),
|
|
* RtlDeleteCriticalSection(), RtlSetCriticalSectionSpinCount(),
|
|
* RtlLeaveCriticalSection(), RtlTryEnterCriticalSection()
|
|
*/
|
|
NTSTATUS WINAPI RtlEnterCriticalSection( RTL_CRITICAL_SECTION *crit )
|
|
{
|
|
if (crit->SpinCount)
|
|
{
|
|
ULONG count;
|
|
|
|
if (RtlTryEnterCriticalSection( crit )) return STATUS_SUCCESS;
|
|
for (count = crit->SpinCount; count > 0; count--)
|
|
{
|
|
if (crit->LockCount > 0) break; /* more than one waiter, don't bother spinning */
|
|
if (crit->LockCount == -1) /* try again */
|
|
{
|
|
if (interlocked_cmpxchg( &crit->LockCount, 0, -1 ) == -1) goto done;
|
|
}
|
|
small_pause();
|
|
}
|
|
}
|
|
|
|
if (interlocked_inc( &crit->LockCount ))
|
|
{
|
|
if (crit->OwningThread == (HANDLE)GetCurrentThreadId())
|
|
{
|
|
crit->RecursionCount++;
|
|
return STATUS_SUCCESS;
|
|
}
|
|
|
|
/* Now wait for it */
|
|
RtlpWaitForCriticalSection( crit );
|
|
}
|
|
done:
|
|
crit->OwningThread = (HANDLE)GetCurrentThreadId();
|
|
crit->RecursionCount = 1;
|
|
return STATUS_SUCCESS;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* RtlTryEnterCriticalSection (NTDLL.@)
|
|
*
|
|
* Tries to enter a critical section without waiting.
|
|
*
|
|
* PARAMS
|
|
* crit [I/O] Critical section to enter
|
|
*
|
|
* RETURNS
|
|
* Success: TRUE. The critical section is held by the caller.
|
|
* Failure: FALSE. The critical section is currently held by another thread.
|
|
*
|
|
* SEE
|
|
* RtlInitializeCriticalSection(), RtlInitializeCriticalSectionAndSpinCount(),
|
|
* RtlDeleteCriticalSection(), RtlEnterCriticalSection(),
|
|
* RtlLeaveCriticalSection(), RtlSetCriticalSectionSpinCount()
|
|
*/
|
|
BOOL WINAPI RtlTryEnterCriticalSection( RTL_CRITICAL_SECTION *crit )
|
|
{
|
|
BOOL ret = FALSE;
|
|
if (interlocked_cmpxchg( &crit->LockCount, 0L, -1 ) == -1)
|
|
{
|
|
crit->OwningThread = (HANDLE)GetCurrentThreadId();
|
|
crit->RecursionCount = 1;
|
|
ret = TRUE;
|
|
}
|
|
else if (crit->OwningThread == (HANDLE)GetCurrentThreadId())
|
|
{
|
|
interlocked_inc( &crit->LockCount );
|
|
crit->RecursionCount++;
|
|
ret = TRUE;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* RtlLeaveCriticalSection (NTDLL.@)
|
|
*
|
|
* Leaves a critical section.
|
|
*
|
|
* PARAMS
|
|
* crit [I/O] Critical section to leave.
|
|
*
|
|
* RETURNS
|
|
* STATUS_SUCCESS.
|
|
*
|
|
* SEE
|
|
* RtlInitializeCriticalSection(), RtlInitializeCriticalSectionAndSpinCount(),
|
|
* RtlDeleteCriticalSection(), RtlEnterCriticalSection(),
|
|
* RtlSetCriticalSectionSpinCount(), RtlTryEnterCriticalSection()
|
|
*/
|
|
NTSTATUS WINAPI RtlLeaveCriticalSection( RTL_CRITICAL_SECTION *crit )
|
|
{
|
|
if (--crit->RecursionCount) interlocked_dec( &crit->LockCount );
|
|
else
|
|
{
|
|
crit->OwningThread = 0;
|
|
if (interlocked_dec( &crit->LockCount ) >= 0)
|
|
{
|
|
/* someone is waiting */
|
|
RtlpUnWaitCriticalSection( crit );
|
|
}
|
|
}
|
|
return STATUS_SUCCESS;
|
|
}
|