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1 /* Threads compatibility routines for libgcc2 and libobjc for VxWorks. */
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2 /* Compile this one with gcc. */
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3 /* Copyright (C) 1997, 1999, 2000, 2008, 2009 Free Software Foundation, Inc.
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4 Contributed by Mike Stump <mrs@wrs.com>.
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5
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6 This file is part of GCC.
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7
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8 GCC is free software; you can redistribute it and/or modify it under
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9 the terms of the GNU General Public License as published by the Free
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10 Software Foundation; either version 3, or (at your option) any later
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11 version.
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12
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13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 Under Section 7 of GPL version 3, you are granted additional
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19 permissions described in the GCC Runtime Library Exception, version
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20 3.1, as published by the Free Software Foundation.
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21
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22 You should have received a copy of the GNU General Public License and
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23 a copy of the GCC Runtime Library Exception along with this program;
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24 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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25 <http://www.gnu.org/licenses/>. */
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26
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27 #ifndef GCC_GTHR_VXWORKS_H
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28 #define GCC_GTHR_VXWORKS_H
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29
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30 #ifdef _LIBOBJC
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31
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32 /* libobjc requires the optional pthreads component. */
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33 #include "gthr-posix.h"
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34
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35 #else
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36 #ifdef __cplusplus
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37 #define UNUSED(x)
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38 #else
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39 #define UNUSED(x) x __attribute__((unused))
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40 #endif
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41
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42 #ifdef __cplusplus
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43 extern "C" {
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44 #endif
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45
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46 #define __GTHREADS 1
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47 #define __gthread_active_p() 1
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48
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49 /* Mutexes are easy, except that they need to be initialized at runtime. */
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50
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51 #include <semLib.h>
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52
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53 typedef SEM_ID __gthread_mutex_t;
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54 /* All VxWorks mutexes are recursive. */
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55 typedef SEM_ID __gthread_recursive_mutex_t;
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56 #define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function
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57 #define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
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58
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59 static inline void
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60 __gthread_mutex_init_function (__gthread_mutex_t *mutex)
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61 {
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62 *mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE);
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63 }
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64
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65 static inline int
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66 __gthread_mutex_destroy (__gthread_mutex_t * UNUSED(mutex))
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67 {
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68 return 0;
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69 }
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70
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71 static inline int
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72 __gthread_mutex_lock (__gthread_mutex_t *mutex)
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73 {
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74 return semTake (*mutex, WAIT_FOREVER);
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75 }
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76
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77 static inline int
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78 __gthread_mutex_trylock (__gthread_mutex_t *mutex)
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79 {
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80 return semTake (*mutex, NO_WAIT);
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81 }
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82
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83 static inline int
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84 __gthread_mutex_unlock (__gthread_mutex_t *mutex)
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85 {
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86 return semGive (*mutex);
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87 }
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88
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89 static inline void
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90 __gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex)
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91 {
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92 __gthread_mutex_init_function (mutex);
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93 }
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94
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95 static inline int
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96 __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex)
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97 {
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98 return __gthread_mutex_lock (mutex);
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99 }
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100
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101 static inline int
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102 __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex)
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103 {
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104 return __gthread_mutex_trylock (mutex);
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105 }
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106
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107 static inline int
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108 __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex)
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109 {
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110 return __gthread_mutex_unlock (mutex);
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111 }
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112
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113 /* pthread_once is complicated enough that it's implemented
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114 out-of-line. See config/vxlib.c. */
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115
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116 typedef struct
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117 {
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118 #ifndef __RTP__
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119 volatile unsigned char busy;
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120 #endif
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121 volatile unsigned char done;
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122 }
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123 __gthread_once_t;
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124
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125 #ifndef __RTP__
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126 # define __GTHREAD_ONCE_INIT { 0, 0 }
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127 #else
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128 # define __GTHREAD_ONCE_INIT { 0 }
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129 #endif
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130
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131 extern int __gthread_once (__gthread_once_t *__once, void (*__func)(void));
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132
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133 /* Thread-specific data requires a great deal of effort, since VxWorks
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134 is not really set up for it. See config/vxlib.c for the gory
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135 details. All the TSD routines are sufficiently complex that they
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136 need to be implemented out of line. */
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137
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138 typedef unsigned int __gthread_key_t;
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139
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140 extern int __gthread_key_create (__gthread_key_t *__keyp, void (*__dtor)(void *));
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141 extern int __gthread_key_delete (__gthread_key_t __key);
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142
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143 extern void *__gthread_getspecific (__gthread_key_t __key);
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144 extern int __gthread_setspecific (__gthread_key_t __key, void *__ptr);
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145
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146 #undef UNUSED
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147
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148 #ifdef __cplusplus
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149 }
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150 #endif
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151
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152 #endif /* not _LIBOBJC */
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153
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154 #endif /* gthr-vxworks.h */
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