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/*
This file is part of the KDE libraries
Copyright (C) 2004 Jaroslaw Staniek <[email protected]>
These sources are based on ftp://g.oswego.edu/pub/misc/malloc.c
file by Doug Lea, released to the public domain.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License version 2 as published by the Free Software Foundation.
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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include <sys/mman.h>
#include <assert.h>
//#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#define MORECORE_FAILURE ((void*)(-1))
#define MUNMAP_FAILURE (-1)
#define USE_MALLOC_LOCK 1
/* Wait for spin lock */
static int slwait (int *sl) {
#ifdef KDEWIN32_9x
/* TODO */
#else
while (InterlockedCompareExchange ((LONG volatile*) sl, (LONG) 1, (LONG) 0) != 0)
Sleep (0);
#endif
return 0;
}
/* Release spin lock */
static int slrelease (int *sl) {
InterlockedExchange (sl, 0);
return 0;
}
/* getpagesize for windows */
static long getpagesize (void)
{
static long g_pagesize = 0;
if (! g_pagesize) {
SYSTEM_INFO system_info;
GetSystemInfo (&system_info);
g_pagesize = system_info.dwPageSize;
}
return g_pagesize;
}
/* Spin lock for emulation code */
static int g_sl;
static long getregionsize (void)
{
static long g_regionsize = 0;
if (! g_regionsize) {
SYSTEM_INFO system_info;
GetSystemInfo (&system_info);
g_regionsize = system_info.dwAllocationGranularity;
}
return g_regionsize;
}
//static void *mmap (void *ptr, long size, long prot, long type, long handle, long arg) {
KDEWIN32_EXPORT void * mmap(void *start, size_t length, int prot , int flags, int fd, off_t offset)
{
static long g_pagesize;
static long g_regionsize;
#ifdef TRACE
printf ("mmap %d\n", length);
#endif
#if defined (USE_MALLOC_LOCK)
/* Wait for spin lock */
slwait (&g_sl);
#endif
/* First time initialization */
if (! g_pagesize)
g_pagesize = getpagesize ();
if (! g_regionsize)
g_regionsize = getregionsize ();
/* Assert preconditions */
assert ((unsigned) start % g_regionsize == 0);
assert (length % g_pagesize == 0);
/* Allocate this */
start = VirtualAlloc (start, length,
MEM_RESERVE | MEM_COMMIT | MEM_TOP_DOWN, PAGE_READWRITE);
if (! start) {
start = (void *) MORECORE_FAILURE;
goto mmap_exit;
}
/* Assert postconditions */
assert ((unsigned) start % g_regionsize == 0);
#ifdef TRACE
printf ("Commit %p %d\n", start, length);
#endif
mmap_exit:
#if defined (USE_MALLOC_LOCK)
/* Release spin lock */
slrelease (&g_sl);
#endif
return start;
}
//static long munmap (void *ptr, long size) {
KDEWIN32_EXPORT int munmap(void *start, size_t length)
{
static long g_pagesize;
static long g_regionsize;
int rc = MUNMAP_FAILURE;
#ifdef TRACE
printf ("munmap %p %d\n", start, length);
#endif
#if defined (USE_MALLOC_LOCK)
/* Wait for spin lock */
slwait (&g_sl);
#endif
/* First time initialization */
if (! g_pagesize)
g_pagesize = getpagesize ();
if (! g_regionsize)
g_regionsize = getregionsize ();
/* Assert preconditions */
assert ((unsigned) start % g_regionsize == 0);
assert (length % g_pagesize == 0);
/* Free this */
if (! VirtualFree (start, 0,
MEM_RELEASE))
goto munmap_exit;
rc = 0;
#ifdef TRACE
printf ("Release %p %d\n", start, length);
#endif
munmap_exit:
#if defined (USE_MALLOC_LOCK)
/* Release spin lock */
slrelease (&g_sl);
#endif
return rc;
}
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