1/* Threads compatibily routines for libgcc2.  */
2/* Compile this one with gcc.  */
3/* Copyright (C) 1997 Free Software Foundation, Inc.
4
5This file is part of GNU CC.
6
7GNU CC is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2, or (at your option)
10any later version.
11
12GNU CC is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with GNU CC; see the file COPYING.  If not, write to
19the Free Software Foundation, 59 Temple Place - Suite 330,
20Boston, MA 02111-1307, USA.  */
21
22/* As a special exception, if you link this library with other files,
23   some of which are compiled with GCC, to produce an executable,
24   this library does not by itself cause the resulting executable
25   to be covered by the GNU General Public License.
26   This exception does not however invalidate any other reasons why
27   the executable file might be covered by the GNU General Public License.  */
28
29#ifndef __gthr_beos_h
30#define __gthr_beos_h
31
32/* Simple spinlocks for mutex handling. We would need C++ for semaphores. */
33
34/*	we do our own thread-safe implementation	*/
35#define __GTHREADS 0
36
37#if defined(MAX)
38#undef MAX
39#endif
40#if defined(MIN)
41#undef MIN
42#endif
43
44#include <OS.h>
45
46typedef int32 __gthread_mutex_t;
47
48#define __GTHREAD_MUTEX_INIT 0
49
50static inline int
51__gthread_active_p ()
52{
53  return 1;
54}
55
56/*	the return value is not documented -- let's assume 0 for "no error"	*/
57/*	the only user I found was in frame.c, which doesn't check...	*/
58static inline int
59__gthread_mutex_lock (__gthread_mutex_t *mutex)
60{
61	while (atomic_or(mutex, 1)) {
62		snooze(3000);
63	}
64	return 0;
65}
66
67#if 0
68//	This appears unused, so I will not implement it.
69//	If it's needed later, we'll do it then.
70static inline int
71__gthread_mutex_trylock (__gthread_mutex_t *mutex __attribute__ ((__unused__)))
72{
73  return 0;
74}
75#endif
76
77/*	the return value is not documented -- let's assume 0 for "no error"	*/
78/*	the only user I found was in frame.c, which doesn't check...	*/
79static inline int
80__gthread_mutex_unlock (__gthread_mutex_t *mutex)
81{
82	/* assert(*mutex != 0); */
83	atomic_and(mutex, 0);
84	return 0;
85}
86
87#endif /* not __gthr_beos_h */
88