1
2/*--------------------------------------------------------------------*/
3/*--- Private scheduler header.                        priv_sema.h ---*/
4/*--------------------------------------------------------------------*/
5
6/*
7   This file is part of Valgrind, a dynamic binary instrumentation
8   framework.
9
10   Copyright (C) 2000-2013 Julian Seward
11      jseward@acm.org
12
13   This program is free software; you can redistribute it and/or
14   modify it under the terms of the GNU General Public License as
15   published by the Free Software Foundation; either version 2 of the
16   License, or (at your option) any later version.
17
18   This program is distributed in the hope that it will be useful, but
19   WITHOUT ANY WARRANTY; without even the implied warranty of
20   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
21   General Public License for more details.
22
23   You should have received a copy of the GNU General Public License
24   along with this program; if not, write to the Free Software
25   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
26   02111-1307, USA.
27
28   The GNU General Public License is contained in the file COPYING.
29*/
30
31#ifndef __PRIV_SEMA_H
32#define __PRIV_SEMA_H
33
34#include "pub_core_basics.h"   // Bool
35
36/* Not really a semaphore, but use a pipe for a token-passing scheme */
37typedef struct {
38   Int  pipe[2];
39   Int  owner_lwpid;  /* who currently has it */
40   Bool held_as_LL;   /* if held, True == held by a _LL call */
41} vg_sema_t;
42
43// Nb: this may be OS-specific, but let's not factor it out until we
44// implement an OS port for which this isn't ok.
45void ML_(sema_init)   ( vg_sema_t *sema );
46void ML_(sema_deinit) ( vg_sema_t *sema );
47void ML_(sema_down)   ( vg_sema_t *sema, Bool as_LL );
48void ML_(sema_up)     ( vg_sema_t *sema, Bool as_LL );
49
50#endif   // __PRIV_SEMA_H
51
52/*--------------------------------------------------------------------*/
53/*--- end                                                          ---*/
54/*--------------------------------------------------------------------*/
55
56