gthr-vxworks.h revision 50397 
1/* Threads compatibily routines for libgcc2 for VxWorks.  */
2/* Compile this one with gcc.  */
3/* Copyright (C) 1997 Free Software Foundation, Inc.
4   Contributed by Mike Stump <mrs@wrs.com>.
5
6This file is part of GNU CC.
7
8GNU CC is free software; you can redistribute it and/or modify
9it under the terms of the GNU General Public License as published by
10the Free Software Foundation; either version 2, or (at your option)
11any later version.
12
13GNU CC is distributed in the hope that it will be useful,
14but WITHOUT ANY WARRANTY; without even the implied warranty of
15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16GNU General Public License for more details.
17
18You should have received a copy of the GNU General Public License
19along with GNU CC; see the file COPYING.  If not, write to
20the Free Software Foundation, 59 Temple Place - Suite 330,
21Boston, MA 02111-1307, USA.  */
22
23/* As a special exception, if you link this library with other files,
24   some of which are compiled with GCC, to produce an executable,
25   this library does not by itself cause the resulting executable
26   to be covered by the GNU General Public License.
27   This exception does not however invalidate any other reasons why
28   the executable file might be covered by the GNU General Public License.  */
29
30#ifndef __gthr_vxworks_h
31#define __gthr_vxworks_h
32
33/* POSIX threads specific definitions.
34   Easy, since the interface is just one-to-one mapping. */
35
36#define __GTHREADS 1
37
38#include <vxWorks.h>
39#include <semLib.h>
40/* typedef void *SEM_ID; */
41
42typedef int __gthread_key_t;
43typedef char __gthread_once_t;
44typedef SEM_ID __gthread_mutex_t;
45
46#define __GTHREAD_MUTEX_INIT 0
47#define __GTHREAD_ONCE_INIT 0
48
49#ifndef REG_SAVED_REG
50static inline int
51__gthread_once (__gthread_once_t *once, void (*func) ())
52{
53  (*func)();
54  return 0;
55}
56
57extern __gthread_key_t eh_context_key;
58
59/* This is not the right way to do it, but the semantic of pthreads
60   don't map well enough onto VxWorks.  */
61
62static void
63__ehdtor ()
64{
65  if (eh_context_key)
66    free ((void*)eh_context_key);
67  eh_context_key = 0;
68}
69
70/* This only works for the code in libgcc2.c.  */
71
72static inline int
73__gthread_key_create (__gthread_key_t *key, void (*dtor) (void *))
74{
75  *key = 0;
76
77  /* We don't have a way to track dtor here, so instead, we
78     register a generic routine that can cleanup any task.  */
79
80  taskDeleteHookAdd (__ehdtor);
81
82  return 0;
83}
84
85#define __gthread_setspecific(key, ptr) \
86  (key = (int) ptr, 0)
87
88static inline int
89__gthread_key_dtor (__gthread_key_t key, void *ptr)
90{
91  /* Just reset the key value to zero. */
92  if (ptr)
93    return __gthread_setspecific (key, 0);
94  else
95    return 0;
96}
97
98#define __gthread_key_delete(key) \
99  taskVarDelete (taskIdSelf (), &key)
100
101#define __gthread_getspecific(key)			\
102     ((key == 0)					\
103      ? ((taskVarAdd (taskIdSelf (), &key) != OK)	\
104	 ? (__terminate (), (void*)0)			\
105	 : (void*)0)					\
106      : (void*)key)
107#endif
108
109static inline int
110__gthread_mutex_lock (__gthread_mutex_t *mutex)
111{
112  if (*mutex == 0)
113    *mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE);
114  return semTake (*mutex, WAIT_FOREVER);
115}
116
117static inline int
118__gthread_mutex_trylock (__gthread_mutex_t *mutex)
119{
120  if (*mutex == 0)
121    *mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE);
122  return semTake (*mutex, NO_WAIT);
123}
124
125static inline int
126__gthread_mutex_unlock (__gthread_mutex_t *mutex)
127{
128  /* We could return the */
129  return semGive (*mutex);
130}
131
132#endif /* not __gthr_vxworks_h */
133