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331 lines
9.4 KiB
C
331 lines
9.4 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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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include "winerror.h"
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#include "winbase.h"
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#include "ntddk.h"
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#include "heap.h"
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#include "debugtools.h"
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#include "thread.h"
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DEFAULT_DEBUG_CHANNEL(win32);
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DECLARE_DEBUG_CHANNEL(relay);
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/***********************************************************************
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* get_semaphore
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*/
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static inline HANDLE get_semaphore( 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 = CreateSemaphoreA( NULL, 0, 1, NULL );
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if (!(ret = (HANDLE)InterlockedCompareExchange( (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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CloseHandle(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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* InitializeCriticalSection (KERNEL32.472) (NTDLL.406)
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*/
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void WINAPI InitializeCriticalSection( 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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crit->LockSemaphore = 0;
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}
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/***********************************************************************
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* DeleteCriticalSection (KERNEL32.185) (NTDLL.327)
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*/
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void WINAPI DeleteCriticalSection( CRITICAL_SECTION *crit )
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{
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if (crit->RecursionCount && crit->OwningThread != GetCurrentThreadId())
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ERR("Deleting owned critical section (%p)\n", crit );
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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) CloseHandle( crit->LockSemaphore );
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crit->LockSemaphore = 0;
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}
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/***********************************************************************
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* EnterCriticalSection (KERNEL32.195) (NTDLL.344)
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*/
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void WINAPI EnterCriticalSection( CRITICAL_SECTION *crit )
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{
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if (InterlockedIncrement( &crit->LockCount ))
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{
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if (crit->OwningThread == GetCurrentThreadId())
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{
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crit->RecursionCount++;
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return;
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}
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/* Now wait for it */
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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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DWORD res = WaitForSingleObject( sem, 5000L );
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if ( res == WAIT_TIMEOUT )
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{
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ERR("Critical section %p wait timed out, retrying (60 sec)\n", crit );
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res = WaitForSingleObject( sem, 60000L );
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if ( res == WAIT_TIMEOUT && TRACE_ON(relay) )
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{
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ERR("Critical section %p wait timed out, retrying (5 min)\n", crit );
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res = WaitForSingleObject( sem, 300000L );
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}
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}
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if (res == STATUS_WAIT_0) break;
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rec.ExceptionCode = EXCEPTION_CRITICAL_SECTION_WAIT;
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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] = (DWORD)crit;
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RtlRaiseException( &rec );
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}
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}
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crit->OwningThread = GetCurrentThreadId();
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crit->RecursionCount = 1;
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}
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/***********************************************************************
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* TryEnterCriticalSection (KERNEL32.898) (NTDLL.969)
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*/
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BOOL WINAPI TryEnterCriticalSection( CRITICAL_SECTION *crit )
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{
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BOOL ret = FALSE;
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if (InterlockedCompareExchange( (PVOID *)&crit->LockCount,
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(PVOID)0L, (PVOID)-1L ) == (PVOID)-1L)
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{
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crit->OwningThread = 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 == GetCurrentThreadId())
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{
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InterlockedIncrement( &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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* LeaveCriticalSection (KERNEL32.494) (NTDLL.426)
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*/
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void WINAPI LeaveCriticalSection( CRITICAL_SECTION *crit )
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{
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if (crit->OwningThread != GetCurrentThreadId()) return;
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if (--crit->RecursionCount)
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{
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InterlockedDecrement( &crit->LockCount );
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return;
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}
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crit->OwningThread = 0;
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if (InterlockedDecrement( &crit->LockCount ) >= 0)
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{
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/* Someone is waiting */
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HANDLE sem = get_semaphore( crit );
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ReleaseSemaphore( sem, 1, NULL );
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}
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}
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/***********************************************************************
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* MakeCriticalSectionGlobal (KERNEL32.515)
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*/
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void WINAPI MakeCriticalSectionGlobal( CRITICAL_SECTION *crit )
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{
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crit->LockSemaphore = ConvertToGlobalHandle( get_semaphore( crit ) );
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}
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/***********************************************************************
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* ReinitializeCriticalSection (KERNEL32.581)
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*/
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void WINAPI ReinitializeCriticalSection( CRITICAL_SECTION *crit )
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{
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if ( !crit->LockSemaphore )
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InitializeCriticalSection( crit );
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}
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/***********************************************************************
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* UninitializeCriticalSection (KERNEL32.703)
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*/
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void WINAPI UninitializeCriticalSection( CRITICAL_SECTION *crit )
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{
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DeleteCriticalSection( crit );
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}
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#ifdef __i386__
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/***********************************************************************
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* InterlockCompareExchange (KERNEL32.@)
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*/
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PVOID WINAPI InterlockedCompareExchange( PVOID *dest, PVOID xchg, PVOID compare );
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__ASM_GLOBAL_FUNC(InterlockedCompareExchange,
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"movl 12(%esp),%eax\n\t"
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"movl 8(%esp),%ecx\n\t"
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"movl 4(%esp),%edx\n\t"
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"lock; cmpxchgl %ecx,(%edx)\n\t"
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"ret $12");
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/***********************************************************************
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* InterlockedExchange (KERNEL32.@)
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*/
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LONG WINAPI InterlockedExchange( PLONG dest, LONG val );
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__ASM_GLOBAL_FUNC(InterlockedExchange,
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"movl 8(%esp),%eax\n\t"
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"movl 4(%esp),%edx\n\t"
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"lock; xchgl %eax,(%edx)\n\t"
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"ret $8");
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/***********************************************************************
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* InterlockedExchangeAdd (KERNEL32.@)
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*/
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LONG WINAPI InterlockedExchangeAdd( PLONG dest, LONG incr );
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__ASM_GLOBAL_FUNC(InterlockedExchangeAdd,
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"movl 8(%esp),%eax\n\t"
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"movl 4(%esp),%edx\n\t"
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"lock; xaddl %eax,(%edx)\n\t"
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"ret $8");
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/***********************************************************************
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* InterlockedIncrement (KERNEL32.@)
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*/
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LONG WINAPI InterlockedIncrement( PLONG dest );
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__ASM_GLOBAL_FUNC(InterlockedIncrement,
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"movl 4(%esp),%edx\n\t"
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"movl $1,%eax\n\t"
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"lock; xaddl %eax,(%edx)\n\t"
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"incl %eax\n\t"
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"ret $4");
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/***********************************************************************
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* InterlockDecrement (KERNEL32.@)
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*/
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LONG WINAPI InterlockedDecrement( PLONG dest );
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__ASM_GLOBAL_FUNC(InterlockedDecrement,
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"movl 4(%esp),%edx\n\t"
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"movl $-1,%eax\n\t"
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"lock; xaddl %eax,(%edx)\n\t"
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"decl %eax\n\t"
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"ret $4");
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#elif defined(__sparc__) && defined(__sun__)
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/*
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* As the earlier Sparc processors lack necessary atomic instructions,
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* I'm simply falling back to the library-provided _lwp_mutex routines
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* to ensure mutual exclusion in a way appropriate for the current
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* architecture.
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*
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* FIXME: If we have the compare-and-swap instruction (Sparc v9 and above)
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* we could use this to speed up the Interlocked operations ...
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*/
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#include <synch.h>
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static lwp_mutex_t interlocked_mutex = DEFAULTMUTEX;
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/***********************************************************************
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* InterlockedCompareExchange (KERNEL32.@)
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*/
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PVOID WINAPI InterlockedCompareExchange( PVOID *dest, PVOID xchg, PVOID compare )
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{
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_lwp_mutex_lock( &interlocked_mutex );
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if ( *dest == compare )
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*dest = xchg;
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else
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compare = *dest;
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_lwp_mutex_unlock( &interlocked_mutex );
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return compare;
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}
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/***********************************************************************
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* InterlockedExchange (KERNEL32.@)
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*/
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LONG WINAPI InterlockedExchange( PLONG dest, LONG val )
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{
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LONG retv;
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_lwp_mutex_lock( &interlocked_mutex );
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retv = *dest;
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*dest = val;
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_lwp_mutex_unlock( &interlocked_mutex );
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return retv;
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}
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/***********************************************************************
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* InterlockedExchangeAdd (KERNEL32.@)
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*/
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LONG WINAPI InterlockedExchangeAdd( PLONG dest, LONG incr )
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{
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LONG retv;
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_lwp_mutex_lock( &interlocked_mutex );
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retv = *dest;
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*dest += incr;
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_lwp_mutex_unlock( &interlocked_mutex );
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return retv;
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}
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/***********************************************************************
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* InterlockedIncrement (KERNEL32.@)
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*/
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LONG WINAPI InterlockedIncrement( PLONG dest )
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{
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LONG retv;
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_lwp_mutex_lock( &interlocked_mutex );
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retv = ++*dest;
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_lwp_mutex_unlock( &interlocked_mutex );
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return retv;
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}
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/***********************************************************************
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* InterlockedDecrement (KERNEL32.@)
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*/
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LONG WINAPI InterlockedDecrement( PLONG dest )
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{
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LONG retv;
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_lwp_mutex_lock( &interlocked_mutex );
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retv = --*dest;
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_lwp_mutex_unlock( &interlocked_mutex );
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return retv;
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}
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#else
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#error You must implement the Interlocked* functions for your CPU
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#endif
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