freebsd-dev/lib/libpthread/thread/thr_msync.c
David Xu 71679e629d Rename _thr_enter_cancellation_point to _thr_cancel_enter, rename
_thr_leave_cancellation_point to _thr_cancel_leave, add a parameter
to _thr_cancel_leave to indicate whether cancellation point should be
checked, this gives us an option to not check cancallation point if
a syscall successfully returns to avoid any leaks, current I have
creat(), open() and fcntl(F_DUPFD) to not check cancellation point
after they sucessfully returned.

Replace some members in structure kse with bit flags to same some
memory.

Conditionally compile THR_ASSERT to nothing if _PTHREAD_INVARIANTS is
not defined.

Inline some small functions in thr_cancel.c.

Use __predict_false in thr_kern.c for some executed only once code.

Reviewd by: deischen
2003-12-09 02:20:56 +00:00

34 lines
747 B
C

/*
* David Leonard <d@openbsd.org>, 1999. Public Domain.
*
* $OpenBSD: uthread_msync.c,v 1.2 1999/06/09 07:16:17 d Exp $
*
* $FreeBSD$
*/
#include <sys/types.h>
#include <sys/mman.h>
#include <pthread.h>
#include "thr_private.h"
__weak_reference(__msync, msync);
int
__msync(void *addr, size_t len, int flags)
{
struct pthread *curthread = _get_curthread();
int ret;
/*
* XXX This is quite pointless unless we know how to get the
* file descriptor associated with the memory, and lock it for
* write. The only real use of this wrapper is to guarantee
* a cancellation point, as per the standard. sigh.
*/
_thr_cancel_enter(curthread);
ret = __sys_msync(addr, len, flags);
_thr_cancel_leave(curthread, 1);
return ret;
}