Sweden-Number/dlls/ntdll/actctx.c

/*
 * Activation contexts
 *
 * Copyright 2004 Jon Griffiths
 * Copyright 2007 Eric Pouech
 * Copyright 2007 Jacek Caban for CodeWeavers
 * Copyright 2007 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include "config.h"
#include "wine/port.h"

#include <stdarg.h>
#include <stdio.h>

#define NONAMELESSUNION
#define NONAMELESSSTRUCT
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "winternl.h"
#include "ntdll_misc.h"
#include "wine/debug.h"
#include "wine/unicode.h"

WINE_DEFAULT_DEBUG_CHANNEL(actctx);

#define ACTCTX_FLAGS_ALL (\
 ACTCTX_FLAG_PROCESSOR_ARCHITECTURE_VALID |\
 ACTCTX_FLAG_LANGID_VALID |\
 ACTCTX_FLAG_ASSEMBLY_DIRECTORY_VALID |\
 ACTCTX_FLAG_RESOURCE_NAME_VALID |\
 ACTCTX_FLAG_SET_PROCESS_DEFAULT |\
 ACTCTX_FLAG_APPLICATION_NAME_VALID |\
 ACTCTX_FLAG_SOURCE_IS_ASSEMBLYREF |\
 ACTCTX_FLAG_HMODULE_VALID )

#define ACTCTX_MAGIC       0xC07E3E11

typedef struct _ACTIVATION_CONTEXT
{
    ULONG               magic;
    int                 ref_count;
} ACTIVATION_CONTEXT;


static ACTIVATION_CONTEXT *check_actctx( HANDLE h )
{
    ACTIVATION_CONTEXT *actctx = h;

    if (!h || h == INVALID_HANDLE_VALUE) return NULL;
    switch (actctx->magic)
    {
    case ACTCTX_MAGIC:
        return actctx;
    default:
        return NULL;
    }
}

static inline void actctx_addref( ACTIVATION_CONTEXT *actctx )
{
    interlocked_xchg_add( &actctx->ref_count, 1 );
}

static void actctx_release( ACTIVATION_CONTEXT *actctx )
{
    if (interlocked_xchg_add( &actctx->ref_count, -1 ) == 1)
    {
        actctx->magic = 0;
        RtlFreeHeap( GetProcessHeap(), 0, actctx );
    }
}


/***********************************************************************
 * RtlCreateActivationContext (NTDLL.@)
 *
 * Create an activation context.
 *
 * FIXME: function signature/prototype is wrong
 */
NTSTATUS WINAPI RtlCreateActivationContext( HANDLE *handle, const void *ptr )
{
    const ACTCTXW *pActCtx = ptr;  /* FIXME: not the right structure */
    ACTIVATION_CONTEXT *actctx;

    TRACE("%p %08x\n", pActCtx, pActCtx ? pActCtx->dwFlags : 0);

    if (!pActCtx || pActCtx->cbSize != sizeof(*pActCtx) ||
        (pActCtx->dwFlags & ~ACTCTX_FLAGS_ALL))
        return STATUS_INVALID_PARAMETER;

    if (!(actctx = RtlAllocateHeap( GetProcessHeap(), 0, sizeof(*actctx) )))
        return STATUS_NO_MEMORY;

    actctx->magic = ACTCTX_MAGIC;
    actctx->ref_count = 1;

    *handle = actctx;
    return STATUS_SUCCESS;
}


/***********************************************************************
 *		RtlAddRefActivationContext (NTDLL.@)
 */
void WINAPI RtlAddRefActivationContext( HANDLE handle )
{
    ACTIVATION_CONTEXT *actctx;

    if ((actctx = check_actctx( handle ))) actctx_addref( actctx );
}


/******************************************************************
 *		RtlReleaseActivationContext (NTDLL.@)
 */
void WINAPI RtlReleaseActivationContext( HANDLE handle )
{
    ACTIVATION_CONTEXT *actctx;

    if ((actctx = check_actctx( handle ))) actctx_release( actctx );
}