137 lines
3.7 KiB
C
137 lines
3.7 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 "debug.h"
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#include "winerror.h"
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#include "winbase.h"
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#include "heap.h"
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#include "debug.h"
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#include "thread.h"
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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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crit->LockSemaphore = CreateSemaphoreA( NULL, 0, 1, NULL );
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crit->Reserved = (DWORD)-1;
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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->LockSemaphore)
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{
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if (crit->RecursionCount) /* Should not happen */
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MSG("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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CloseHandle( crit->LockSemaphore );
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crit->LockSemaphore = 0;
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}
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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 (!crit->LockSemaphore)
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{
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FIXME(win32,"entering uninitialized section(%p)?\n",crit);
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InitializeCriticalSection(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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/* FIXME: should set a timeout and raise an exception */
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WaitForSingleObject( crit->LockSemaphore, INFINITE );
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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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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 TRUE;
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}
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/* FIXME: this doesn't work */
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InterlockedDecrement( &crit->LockCount );
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return FALSE;
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}
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crit->OwningThread = GetCurrentThreadId();
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crit->RecursionCount = 1;
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return TRUE;
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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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ReleaseSemaphore( crit->LockSemaphore, 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( crit->LockSemaphore );
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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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DeleteCriticalSection( crit );
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InitializeCriticalSection( crit );
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}
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