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Sweden-Number/dlls/ntdll/critsection.c

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/*
* 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 <stdio.h>
#include <sys/types.h>
#include "winerror.h"
#include "winternl.h"
#include "wine/debug.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;
}
/***********************************************************************
* 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.@)
*
* Initialise a new RTL_CRITICAL_SECTION.
*
* PARAMS
* crit [O] Critical section to initialise
*
* RETURN
* STATUS_SUCCESS.
*/
NTSTATUS WINAPI RtlInitializeCriticalSection( RTL_CRITICAL_SECTION *crit )
{
crit->DebugInfo = NULL;
crit->LockCount = -1;
crit->RecursionCount = 0;
crit->OwningThread = 0;
crit->LockSemaphore = 0;
return STATUS_SUCCESS;
}
/***********************************************************************
* RtlInitializeCriticalSectionAndSpinCount (NTDLL.@)
*
* Initialise a new RTL_CRITICAL_SECTION with a given spin count.
*
* PARAMS
* crit [O] Critical section to initialise
* spincount [I] Spin count for crit
*
* RETURNS
* STATUS_SUCCESS.
*
* NOTES
* The InitializeCriticalSectionAndSpinCount() (KERNEL32) function is
* available on NT4SP3 or later, and Win98 or later.
* I am assuming that this is the correct definition given the MSDN
* docs for the kernel32 functions.
*/
NTSTATUS WINAPI RtlInitializeCriticalSectionAndSpinCount( RTL_CRITICAL_SECTION *crit, DWORD spincount )
{
if(spincount) TRACE("critsection=%p: spincount=%ld not supported\n", crit, spincount);
crit->SpinCount = spincount;
return RtlInitializeCriticalSection( crit );
}
/***********************************************************************
* RtlDeleteCriticalSection (NTDLL.@)
*
* Free the resources used by an RTL_CRITICAL_SECTION.
*
* PARAMS
* crit [I/O] Critical section to free
*
* RETURNS
* STATUS_SUCCESS.
*/
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;
return STATUS_SUCCESS;
}
/***********************************************************************
* RtlpWaitForCriticalSection (NTDLL.@)
*
* Wait for an RTL_CRITICAL_SECTION to become free.
*
* PARAMS
* crit [I/O] Critical section to wait for
*
* RETURNS
* STATUS_SUCCESS.
*/
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 == WAIT_TIMEOUT )
{
const char *name = (char *)crit->DebugInfo;
if (!name) name = "?";
ERR( "section %p %s wait timed out, retrying (60 sec) tid=%04lx\n",
crit, debugstr_a(name), GetCurrentThreadId() );
time.QuadPart = -60000 * 10000;
status = NtWaitForSingleObject( sem, FALSE, &time );
if ( status == WAIT_TIMEOUT && TRACE_ON(relay) )
{
ERR( "section %p %s wait timed out, retrying (5 min) tid=%04lx\n",
crit, debugstr_a(name), GetCurrentThreadId() );
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) continue;
rec.ExceptionCode = STATUS_POSSIBLE_DEADLOCK;
rec.ExceptionFlags = 0;
rec.ExceptionRecord = NULL;
rec.ExceptionAddress = RtlRaiseException; /* sic */
rec.NumberParameters = 1;
rec.ExceptionInformation[0] = (DWORD)crit;
RtlRaiseException( &rec );
}
}
/***********************************************************************
* RtlpUnWaitCriticalSection (NTDLL.@)
*/
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.@)
*
* Enter an RTL_CRITICAL_SECTION.
*
* PARAMS
* crit [I/O] Critical section to enter
*
* RETURNS
* STATUS_SUCCESS. The critical section is held by the caller.
*
* NOTES
* The caller will wait until the critical section is availale.
*/
NTSTATUS WINAPI RtlEnterCriticalSection( RTL_CRITICAL_SECTION *crit )
{
if (interlocked_inc( &crit->LockCount ))
{
if (crit->OwningThread == (HANDLE)GetCurrentThreadId())
{
crit->RecursionCount++;
return STATUS_SUCCESS;
}
/* Now wait for it */
RtlpWaitForCriticalSection( crit );
}
crit->OwningThread = (HANDLE)GetCurrentThreadId();
crit->RecursionCount = 1;
return STATUS_SUCCESS;
}
/***********************************************************************
* RtlTryEnterCriticalSection (NTDLL.@)
*
* Enter an RTL_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.
*/
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.@)
*
* Leave an RTL_CRITICAL_SECTION.
*
* PARAMS
* crit [I/O] Critical section to enter
*
* RETURNS
* STATUS_SUCCESS.
*/
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;
}
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