aboutsummaryrefslogtreecommitdiff
path: root/gcc/gthr-vxworks.h
blob: dee15731f0ac0a951712b8a2fcc9099b1c54e716 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
/* Threads compatibility routines for libgcc2 and libobjc for VxWorks.  */
/* Compile this one with gcc.  */
/* Copyright (C) 1997, 1999, 2000, 2008, 2009 Free Software Foundation, Inc.
   Contributed by Mike Stump <mrs@wrs.com>.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
<http://www.gnu.org/licenses/>.  */

#ifndef GCC_GTHR_VXWORKS_H
#define GCC_GTHR_VXWORKS_H

#ifdef _LIBOBJC

/* libobjc requires the optional pthreads component.  */
#include "gthr-posix.h"

#else
#ifdef __cplusplus
#define UNUSED(x)
#else
#define UNUSED(x) x __attribute__((unused))
#endif

#ifdef __cplusplus
extern "C" {
#endif

#define __GTHREADS 1
#define __gthread_active_p() 1

/* Mutexes are easy, except that they need to be initialized at runtime.  */

#include <semLib.h>

typedef SEM_ID __gthread_mutex_t;
/* All VxWorks mutexes are recursive.  */
typedef SEM_ID __gthread_recursive_mutex_t;
#define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function
#define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function

static inline void
__gthread_mutex_init_function (__gthread_mutex_t *mutex)
{
  *mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE);
}

static inline int
__gthread_mutex_destroy (__gthread_mutex_t * UNUSED(mutex))
{
  return 0;
}

static inline int
__gthread_mutex_lock (__gthread_mutex_t *mutex)
{
  return semTake (*mutex, WAIT_FOREVER);
}

static inline int
__gthread_mutex_trylock (__gthread_mutex_t *mutex)
{
  return semTake (*mutex, NO_WAIT);
}

static inline int
__gthread_mutex_unlock (__gthread_mutex_t *mutex)
{
  return semGive (*mutex);
}

static inline void
__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex)
{
  __gthread_mutex_init_function (mutex);
}

static inline int
__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex)
{
  return __gthread_mutex_lock (mutex);
}

static inline int
__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex)
{
  return __gthread_mutex_trylock (mutex);
}

static inline int
__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex)
{
  return __gthread_mutex_unlock (mutex);
}

/* pthread_once is complicated enough that it's implemented
   out-of-line.  See config/vxlib.c.  */

typedef struct
{
#if !defined(__RTP__)
#if defined(__PPC__)
  __attribute ((aligned (__alignof (unsigned))))
#endif
  volatile unsigned char busy;
#endif
  volatile unsigned char done;
#if !defined(__RTP__) && defined(__PPC__)
  /* PPC's test-and-set implementation requires a 4 byte aligned
     object, of which it only sets the first byte.  We use padding
     here, in order to maintain some amount of backwards
     compatibility.  Without this padding, gthread_once objects worked
     by accident because they happen to be static objects and the ppc
     port automatically increased their alignment to 4 bytes.  */
  unsigned char pad1;
  unsigned char pad2;
#endif
}
__gthread_once_t;

#if defined (__RTP__)
# define __GTHREAD_ONCE_INIT { 0 }
#elif defined (__PPC__) 
# define __GTHREAD_ONCE_INIT { 0, 0, 0, 0 }
#else
# define __GTHREAD_ONCE_INIT { 0, 0 }
#endif

extern int __gthread_once (__gthread_once_t *__once, void (*__func)(void));

/* Thread-specific data requires a great deal of effort, since VxWorks
   is not really set up for it.  See config/vxlib.c for the gory
   details.  All the TSD routines are sufficiently complex that they
   need to be implemented out of line.  */

typedef unsigned int __gthread_key_t;

extern int __gthread_key_create (__gthread_key_t *__keyp, void (*__dtor)(void *));
extern int __gthread_key_delete (__gthread_key_t __key);

extern void *__gthread_getspecific (__gthread_key_t __key);
extern int __gthread_setspecific (__gthread_key_t __key, void *__ptr);

#undef UNUSED

#ifdef __cplusplus
}
#endif

#endif /* not _LIBOBJC */

#endif /* gthr-vxworks.h */