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111
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1 /* Threads compatibility routines for libgcc2. */
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2 /* Compile this one with gcc. */
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145
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3 /* Copyright (C) 1997-2020 Free Software Foundation, Inc.
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111
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify it under
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8 the terms of the GNU General Public License as published by the Free
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9 Software Foundation; either version 3, or (at your option) any later
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10 version.
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11
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12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 Under Section 7 of GPL version 3, you are granted additional
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18 permissions described in the GCC Runtime Library Exception, version
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19 3.1, as published by the Free Software Foundation.
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20
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21 You should have received a copy of the GNU General Public License and
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22 a copy of the GCC Runtime Library Exception along with this program;
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23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 <http://www.gnu.org/licenses/>. */
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25
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26 #ifndef GCC_GTHR_H
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27 #define GCC_GTHR_H
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28
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29 #ifndef HIDE_EXPORTS
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30 #pragma GCC visibility push(default)
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31 #endif
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32
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33 /* If this file is compiled with threads support, it must
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34 #define __GTHREADS 1
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35 to indicate that threads support is present. Also it has define
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36 function
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37 int __gthread_active_p ()
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38 that returns 1 if thread system is active, 0 if not.
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39
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40 The threads interface must define the following types:
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41 __gthread_key_t
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42 __gthread_once_t
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43 __gthread_mutex_t
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44 __gthread_recursive_mutex_t
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45
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46 The threads interface must define the following macros:
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47
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48 __GTHREAD_ONCE_INIT
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49 to initialize __gthread_once_t
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50 __GTHREAD_MUTEX_INIT
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51 to initialize __gthread_mutex_t to get a fast
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52 non-recursive mutex.
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53 __GTHREAD_MUTEX_INIT_FUNCTION
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54 to initialize __gthread_mutex_t to get a fast
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55 non-recursive mutex.
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56 Define this to a function which looks like this:
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57 void __GTHREAD_MUTEX_INIT_FUNCTION (__gthread_mutex_t *)
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58 Some systems can't initialize a mutex without a
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59 function call. Don't define __GTHREAD_MUTEX_INIT in this case.
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60 __GTHREAD_RECURSIVE_MUTEX_INIT
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61 __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION
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62 as above, but for a recursive mutex.
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63
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64 The threads interface must define the following static functions:
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65
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66 int __gthread_once (__gthread_once_t *once, void (*func) ())
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67
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68 int __gthread_key_create (__gthread_key_t *keyp, void (*dtor) (void *))
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69 int __gthread_key_delete (__gthread_key_t key)
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70
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71 void *__gthread_getspecific (__gthread_key_t key)
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72 int __gthread_setspecific (__gthread_key_t key, const void *ptr)
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73
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74 int __gthread_mutex_destroy (__gthread_mutex_t *mutex);
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75 int __gthread_recursive_mutex_destroy (__gthread_recursive_mutex_t *mutex);
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76
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77 int __gthread_mutex_lock (__gthread_mutex_t *mutex);
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78 int __gthread_mutex_trylock (__gthread_mutex_t *mutex);
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79 int __gthread_mutex_unlock (__gthread_mutex_t *mutex);
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80
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81 int __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex);
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82 int __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex);
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83 int __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex);
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84
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85 The following are supported in POSIX threads only. They are required to
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86 fix a deadlock in static initialization inside libsupc++. The header file
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87 gthr-posix.h defines a symbol __GTHREAD_HAS_COND to signify that these extra
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88 features are supported.
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89
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90 Types:
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91 __gthread_cond_t
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92
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93 Macros:
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94 __GTHREAD_COND_INIT
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95 __GTHREAD_COND_INIT_FUNCTION
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96
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97 Interface:
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98 int __gthread_cond_broadcast (__gthread_cond_t *cond);
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99 int __gthread_cond_wait (__gthread_cond_t *cond, __gthread_mutex_t *mutex);
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100 int __gthread_cond_wait_recursive (__gthread_cond_t *cond,
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101 __gthread_recursive_mutex_t *mutex);
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102
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103 All functions returning int should return zero on success or the error
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104 number. If the operation is not supported, -1 is returned.
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105
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106 If the following are also defined, you should
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107 #define __GTHREADS_CXX0X 1
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108 to enable the c++0x thread library.
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109
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110 Types:
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111 __gthread_t
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112 __gthread_time_t
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113
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114 Interface:
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115 int __gthread_create (__gthread_t *thread, void *(*func) (void*),
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116 void *args);
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117 int __gthread_join (__gthread_t thread, void **value_ptr);
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118 int __gthread_detach (__gthread_t thread);
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119 int __gthread_equal (__gthread_t t1, __gthread_t t2);
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120 __gthread_t __gthread_self (void);
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121 int __gthread_yield (void);
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122
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123 int __gthread_mutex_timedlock (__gthread_mutex_t *m,
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124 const __gthread_time_t *abs_timeout);
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125 int __gthread_recursive_mutex_timedlock (__gthread_recursive_mutex_t *m,
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126 const __gthread_time_t *abs_time);
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127
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128 int __gthread_cond_signal (__gthread_cond_t *cond);
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129 int __gthread_cond_timedwait (__gthread_cond_t *cond,
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130 __gthread_mutex_t *mutex,
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131 const __gthread_time_t *abs_timeout);
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132
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133 */
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134
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135 #if SUPPORTS_WEAK
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136 /* The pe-coff weak support isn't fully compatible to ELF's weak.
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137 For static libraries it might would work, but as we need to deal
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138 with shared versions too, we disable it for mingw-targets. */
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139 #ifdef __MINGW32__
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140 #undef GTHREAD_USE_WEAK
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141 #define GTHREAD_USE_WEAK 0
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142 #endif
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143
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144 #ifndef GTHREAD_USE_WEAK
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145 #define GTHREAD_USE_WEAK 1
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146 #endif
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147 #endif
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148 #include "gthr-default.h"
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149
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150 #ifndef HIDE_EXPORTS
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151 #pragma GCC visibility pop
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152 #endif
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153
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154 #endif /* ! GCC_GTHR_H */
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