/*
    Copyright 2005-2014 Intel Corporation.  All Rights Reserved.

    This file is part of Threading Building Blocks. Threading Building Blocks is free software;
    you can redistribute it and/or modify it under the terms of the GNU General Public License
    version 2  as  published  by  the  Free Software Foundation.  Threading Building Blocks 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 General Public License for more details.   You should have received a copy of
    the  GNU General Public License along with Threading Building Blocks; if not, write to the
    Free Software Foundation, Inc.,  51 Franklin St,  Fifth Floor,  Boston,  MA 02110-1301 USA

    As a special exception,  you may use this file  as part of a free software library without
    restriction.  Specifically,  if other files instantiate templates  or use macros or inline
    functions from this file, or you compile this file and link it with other files to produce
    an executable,  this file does not by itself cause the resulting executable to be covered
    by the GNU General Public License. This exception does not however invalidate any other
    reasons why the executable file might be covered by the GNU General Public License.
*/

#ifndef _itt_shared_malloc_MapMemory_H
#define _itt_shared_malloc_MapMemory_H

#include <stdlib.h>

void *ErrnoPreservingMalloc(size_t bytes)
{
    int prevErrno = errno;
    void *ret = malloc( bytes );
    if (!ret)
        errno = prevErrno;
    return ret;
}

#if __linux__ || __APPLE__ || __sun || __FreeBSD__

#if __sun && !defined(_XPG4_2)
 // To have void* as mmap's 1st argument
 #define _XPG4_2 1
 #define XPG4_WAS_DEFINED 1
#endif

#include <sys/mman.h>
#if __linux__
/* __TBB_MAP_HUGETLB is MAP_HUGETLB from system header linux/mman.h.
   The header do not included here, as on some Linux flavors inclusion of
   linux/mman.h leads to compilation error,
   while changing of MAP_HUGETLB is highly unexpected.
*/
#define __TBB_MAP_HUGETLB 0x40000
#else
#define __TBB_MAP_HUGETLB 0
#endif

#if XPG4_WAS_DEFINED
 #undef _XPG4_2
 #undef XPG4_WAS_DEFINED
#endif

#define MEMORY_MAPPING_USES_MALLOC 0
void* MapMemory (size_t bytes, bool hugePages)
{
    void* result = 0;
    int prevErrno = errno;
#ifndef MAP_ANONYMOUS
// OS X* defines MAP_ANON, which is deprecated in Linux*.
#define MAP_ANONYMOUS MAP_ANON
#endif /* MAP_ANONYMOUS */
    int addFlags = hugePages? __TBB_MAP_HUGETLB : 0;
    result = mmap(NULL, bytes, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|addFlags, -1, 0);
    if (result==MAP_FAILED)
        errno = prevErrno;
    return result==MAP_FAILED? 0: result;
}

int UnmapMemory(void *area, size_t bytes)
{
    int prevErrno = errno;
    int ret = munmap(area, bytes);
    if (-1 == ret)
        errno = prevErrno;
    return ret;
}

#elif (_WIN32 || _WIN64) && !_XBOX && !__TBB_WIN8UI_SUPPORT
#include <windows.h>

#define MEMORY_MAPPING_USES_MALLOC 0
void* MapMemory (size_t bytes, bool)
{
    /* Is VirtualAlloc thread safe? */
    return VirtualAlloc(NULL, bytes, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
}

int UnmapMemory(void *area, size_t /*bytes*/)
{
    BOOL result = VirtualFree(area, 0, MEM_RELEASE);
    return !result;
}

#else

#define MEMORY_MAPPING_USES_MALLOC 1
void* MapMemory (size_t bytes, bool)
{
    return ErrnoPreservingMalloc( bytes );
}

int UnmapMemory(void *area, size_t /*bytes*/)
{
    free( area );
    return 0;
}

#endif /* OS dependent */

#if MALLOC_CHECK_RECURSION && MEMORY_MAPPING_USES_MALLOC
#error Impossible to protect against malloc recursion when memory mapping uses malloc.
#endif

#endif /* _itt_shared_malloc_MapMemory_H */
