// Copyright (c) 2000-2011 by Digital Mars
// All Rights Reserved
// written by Walter Bright
// http://www.digitalmars.com
// License for redistribution is by either the Artistic License
// in artistic.txt, or the GNU General Public License in gnu.txt.
// See the included readme.txt for details.


#include <windows.h>

#include "os.h"

/***********************************
 * Map memory.
 */

void *os_mem_map(unsigned nbytes)
{
    return VirtualAlloc(NULL, nbytes, MEM_RESERVE, PAGE_READWRITE);
}

/***********************************
 * Commit memory.
 * Returns:
 *      0       success
 *      !=0     failure
 */

int os_mem_commit(void *base, unsigned offset, unsigned nbytes)
{
    void *p;

    p = VirtualAlloc((char *)base + offset, nbytes, MEM_COMMIT, PAGE_READWRITE);
    return (p == NULL);
}


/***********************************
 * Decommit memory.
 * Returns:
 *      0       success
 *      !=0     failure
 */

int os_mem_decommit(void *base, unsigned offset, unsigned nbytes)
{
    return VirtualFree((char *)base + offset, nbytes, MEM_DECOMMIT) == 0;
}

/***********************************
 * Unmap memory allocated with os_mem_map().
 * Memory must have already been decommitted.
 * Returns:
 *      0       success
 *      !=0     failure
 */

int os_mem_unmap(void *base, unsigned nbytes)
{
    (void)nbytes;
    return VirtualFree(base, 0, MEM_RELEASE) == 0;
}


/********************************************
 */

pthread_t pthread_self()
{
    return (pthread_t) GetCurrentThreadId();
}