scheduler/critsection.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 <errno.h>
#include <stdio.h>
#include <sys/types.h>

#include "winerror.h"
#include "winbase.h"
#include "ntddk.h"
#include "wine/debug.h"
#include "thread.h"

WINE_DEFAULT_DEBUG_CHANNEL(win32);
WINE_DECLARE_DEBUG_CHANNEL(relay);

/***********************************************************************
 *           InitializeCriticalSection   (KERNEL32.@)
 */
void WINAPI InitializeCriticalSection( CRITICAL_SECTION *crit )
{
    NTSTATUS ret = RtlInitializeCriticalSection( crit );
    if (ret) RtlRaiseStatus( ret );
}

/***********************************************************************
 *           InitializeCriticalSectionAndSpinCount   (KERNEL32.@)
 */
BOOL WINAPI InitializeCriticalSectionAndSpinCount( CRITICAL_SECTION *crit, DWORD spincount )
{
    NTSTATUS ret = RtlInitializeCriticalSectionAndSpinCount( crit, spincount );
    if (ret) RtlRaiseStatus( ret );
    return !ret;
}

/***********************************************************************
 *           SetCriticalSectionSpinCount   (KERNEL32.@)
 * This function is available on NT4SP3 or later, but not Win98
 * It is SMP related
 */
DWORD WINAPI SetCriticalSectionSpinCount( CRITICAL_SECTION *crit, DWORD spincount )
{
    ULONG_PTR oldspincount = crit->SpinCount;
    if(spincount) FIXME("critsection=%p: spincount=%ld not supported\n", crit, spincount);
    crit->SpinCount = spincount;
    return oldspincount;
}

/***********************************************************************
 *           MakeCriticalSectionGlobal   (KERNEL32.@)
 */
void WINAPI MakeCriticalSectionGlobal( CRITICAL_SECTION *crit )
{
    /* let's assume that only one thread at a time will try to do this */
    HANDLE sem = crit->LockSemaphore;
    if (!sem) NtCreateSemaphore( &sem, SEMAPHORE_ALL_ACCESS, NULL, 0, 1 );
    crit->LockSemaphore = ConvertToGlobalHandle( sem );
}


/***********************************************************************
 *           ReinitializeCriticalSection   (KERNEL32.@)
 */
void WINAPI ReinitializeCriticalSection( CRITICAL_SECTION *crit )
{
    if ( !crit->LockSemaphore )
        RtlInitializeCriticalSection( crit );
}


/***********************************************************************
 *           UninitializeCriticalSection   (KERNEL32.@)
 */
void WINAPI UninitializeCriticalSection( CRITICAL_SECTION *crit )
{
    RtlDeleteCriticalSection( crit );
}

#ifdef __i386__

/***********************************************************************
 *		InterlockedCompareExchange (KERNEL32.@)
 */
/* LONG WINAPI InterlockedCompareExchange( PLONG dest, LONG xchg, LONG compare ); */
__ASM_GLOBAL_FUNC(InterlockedCompareExchange,
                  "movl 12(%esp),%eax\n\t"
                  "movl 8(%esp),%ecx\n\t"
                  "movl 4(%esp),%edx\n\t"
                  "lock; cmpxchgl %ecx,(%edx)\n\t"
                  "ret $12");

/***********************************************************************
 *		InterlockedExchange (KERNEL32.@)
 */
/* LONG WINAPI InterlockedExchange( PLONG dest, LONG val ); */
__ASM_GLOBAL_FUNC(InterlockedExchange,
                  "movl 8(%esp),%eax\n\t"
                  "movl 4(%esp),%edx\n\t"
                  "lock; xchgl %eax,(%edx)\n\t"
                  "ret $8");

/***********************************************************************
 *		InterlockedExchangeAdd (KERNEL32.@)
 */
/* LONG WINAPI InterlockedExchangeAdd( PLONG dest, LONG incr ); */
__ASM_GLOBAL_FUNC(InterlockedExchangeAdd,
                  "movl 8(%esp),%eax\n\t"
                  "movl 4(%esp),%edx\n\t"
                  "lock; xaddl %eax,(%edx)\n\t"
                  "ret $8");

/***********************************************************************
 *		InterlockedIncrement (KERNEL32.@)
 */
/* LONG WINAPI InterlockedIncrement( PLONG dest ); */
__ASM_GLOBAL_FUNC(InterlockedIncrement,
                  "movl 4(%esp),%edx\n\t"
                  "movl $1,%eax\n\t"
                  "lock; xaddl %eax,(%edx)\n\t"
                  "incl %eax\n\t"
                  "ret $4");

/***********************************************************************
 *		InterlockedDecrement (KERNEL32.@)
 */
__ASM_GLOBAL_FUNC(InterlockedDecrement,
                  "movl 4(%esp),%edx\n\t"
                  "movl $-1,%eax\n\t"
                  "lock; xaddl %eax,(%edx)\n\t"
                  "decl %eax\n\t"
                  "ret $4");

#else  /* __i386__ */

/***********************************************************************
 *		InterlockedCompareExchange (KERNEL32.@)
 */
LONG WINAPI InterlockedCompareExchange( PLONG dest, LONG xchg, LONG compare )
{
    return interlocked_cmpxchg( dest, xchg, compare );
}

/***********************************************************************
 *		InterlockedExchange (KERNEL32.@)
 */
LONG WINAPI InterlockedExchange( PLONG dest, LONG val )
{
    return interlocked_xchg( dest, val );
}

/***********************************************************************
 *		InterlockedExchangeAdd (KERNEL32.@)
 */
LONG WINAPI InterlockedExchangeAdd( PLONG dest, LONG incr )
{
    return interlocked_xchg_add( dest, incr );
}

/***********************************************************************
 *		InterlockedIncrement (KERNEL32.@)
 */
LONG WINAPI InterlockedIncrement( PLONG dest )
{
    return interlocked_xchg_add( dest, 1 ) + 1;
}

/***********************************************************************
 *		InterlockedDecrement (KERNEL32.@)
 */
LONG WINAPI InterlockedDecrement( PLONG dest )
{
    return interlocked_xchg_add( dest, -1 ) - 1;
}

#endif  /* __i386__ */