1 /* Threads compatibility routines for libgcc2 and libobjc for VxWorks. */
2 /* Compile this one with gcc. */
3 /* Copyright (C) 1997, 1999, 2000, 2008, 2009, 2011
4 Free Software Foundation, Inc.
5 Contributed by Mike Stump <mrs@wrs.com>.
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 3, or (at your option) any later
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 Under Section 7 of GPL version 3, you are granted additional
20 permissions described in the GCC Runtime Library Exception, version
21 3.1, as published by the Free Software Foundation.
23 You should have received a copy of the GNU General Public License and
24 a copy of the GCC Runtime Library Exception along with this program;
25 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
26 <http://www.gnu.org/licenses/>. */
28 #ifndef GCC_GTHR_VXWORKS_H
29 #define GCC_GTHR_VXWORKS_H
33 /* libobjc requires the optional pthreads component. */
34 #include "config/gthr-posix.h"
40 #define UNUSED(x) x __attribute__((unused))
48 #define __gthread_active_p() 1
50 /* Mutexes are easy, except that they need to be initialized at runtime. */
54 typedef SEM_ID __gthread_mutex_t;
55 /* All VxWorks mutexes are recursive. */
56 typedef SEM_ID __gthread_recursive_mutex_t;
57 #define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function
58 #define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
61 __gthread_mutex_init_function (__gthread_mutex_t *mutex)
63 *mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE);
67 __gthread_mutex_destroy (__gthread_mutex_t * UNUSED(mutex))
73 __gthread_mutex_lock (__gthread_mutex_t *mutex)
75 return semTake (*mutex, WAIT_FOREVER);
79 __gthread_mutex_trylock (__gthread_mutex_t *mutex)
81 return semTake (*mutex, NO_WAIT);
85 __gthread_mutex_unlock (__gthread_mutex_t *mutex)
87 return semGive (*mutex);
91 __gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex)
93 __gthread_mutex_init_function (mutex);
97 __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex)
99 return __gthread_mutex_lock (mutex);
103 __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex)
105 return __gthread_mutex_trylock (mutex);
109 __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex)
111 return __gthread_mutex_unlock (mutex);
114 /* pthread_once is complicated enough that it's implemented
115 out-of-line. See config/vxlib.c. */
119 #if !defined(__RTP__)
121 __attribute ((aligned (__alignof (unsigned))))
123 volatile unsigned char busy;
125 volatile unsigned char done;
126 #if !defined(__RTP__) && defined(__PPC__)
127 /* PPC's test-and-set implementation requires a 4 byte aligned
128 object, of which it only sets the first byte. We use padding
129 here, in order to maintain some amount of backwards
130 compatibility. Without this padding, gthread_once objects worked
131 by accident because they happen to be static objects and the ppc
132 port automatically increased their alignment to 4 bytes. */
139 #if defined (__RTP__)
140 # define __GTHREAD_ONCE_INIT { 0 }
141 #elif defined (__PPC__)
142 # define __GTHREAD_ONCE_INIT { 0, 0, 0, 0 }
144 # define __GTHREAD_ONCE_INIT { 0, 0 }
147 extern int __gthread_once (__gthread_once_t *__once, void (*__func)(void));
149 /* Thread-specific data requires a great deal of effort, since VxWorks
150 is not really set up for it. See config/vxlib.c for the gory
151 details. All the TSD routines are sufficiently complex that they
152 need to be implemented out of line. */
154 typedef unsigned int __gthread_key_t;
156 extern int __gthread_key_create (__gthread_key_t *__keyp, void (*__dtor)(void *));
157 extern int __gthread_key_delete (__gthread_key_t __key);
159 extern void *__gthread_getspecific (__gthread_key_t __key);
160 extern int __gthread_setspecific (__gthread_key_t __key, void *__ptr);
168 #endif /* not _LIBOBJC */
170 #endif /* gthr-vxworks.h */