thr_msync.c revision 174112 
1/*
2 * David Leonard <d@openbsd.org>, 1999. Public Domain.
3 *
4 * $OpenBSD: uthread_msync.c,v 1.2 1999/06/09 07:16:17 d Exp $
5 *
6 * $FreeBSD: head/lib/libkse/thread/thr_msync.c 174112 2007-11-30 17:20:29Z deischen $
7 */
8
9#include "namespace.h"
10#include <sys/types.h>
11#include <sys/mman.h>
12#include <pthread.h>
13#include "un-namespace.h"
14#include "thr_private.h"
15
16LT10_COMPAT_PRIVATE(__msync);
17LT10_COMPAT_DEFAULT(msync);
18
19int __msync(void *addr, size_t len, int flags);
20
21__weak_reference(__msync, msync);
22
23int
24__msync(void *addr, size_t len, int flags)
25{
26	struct pthread *curthread = _get_curthread();
27	int	ret;
28
29	/*
30	 * XXX This is quite pointless unless we know how to get the
31	 * file descriptor associated with the memory, and lock it for
32	 * write. The only real use of this wrapper is to guarantee
33	 * a cancellation point, as per the standard. sigh.
34	 */
35	_thr_cancel_enter(curthread);
36	ret = __sys_msync(addr, len, flags);
37	_thr_cancel_leave(curthread, 1);
38
39	return (ret);
40}
41