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