1 /* Threads compatibility routines for libgcc2 and libobjc. */ 2 /* Compile this one with gcc. */ 3 /* Copyright (C) 2019-2020 Free Software Foundation, Inc. 4 5 This file is part of GCC. 6 7 GCC is free software; you can redistribute it and/or modify it under 8 the terms of the GNU General Public License as published by the Free 9 Software Foundation; either version 3, or (at your option) any later 10 version. 11 12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 13 WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15 for more details. 16 17 Under Section 7 of GPL version 3, you are granted additional 18 permissions described in the GCC Runtime Library Exception, version 19 3.1, as published by the Free Software Foundation. 20 21 You should have received a copy of the GNU General Public License and 22 a copy of the GCC Runtime Library Exception along with this program; 23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 <http://www.gnu.org/licenses/>. */ 25 26 /* AMD GCN does not support dynamic creation of threads. There may be many 27 hardware threads, but they're all created simultaneously at launch time. 28 29 This implementation is intended to provide mutexes for libgfortran, etc. 30 It is not intended to provide a TLS implementation at this time, 31 although that may be added later if needed. 32 33 __gthread_active_p returns "1" to ensure that mutexes are used, and that 34 programs attempting to use emutls will fail with the appropriate abort. 35 It is expected that the TLS tests will fail. */ 36 37 #ifndef GCC_GTHR_GCN_H 38 #define GCC_GTHR_GCN_H 39 40 #define __GTHREADS 1 41 42 #ifdef __cplusplus 43 extern "C" { 44 #endif 45 46 #ifdef _LIBOBJC 47 #error "Objective C is not supported on AMD GCN" 48 #else 49 50 static inline int 51 __gthread_active_p (void) 52 { 53 return 1; 54 } 55 56 typedef int __gthread_key_t; 57 typedef int __gthread_once_t; 58 typedef int __gthread_mutex_t; 59 typedef int __gthread_recursive_mutex_t; 60 61 #define __GTHREAD_ONCE_INIT 0 62 #define __GTHREAD_MUTEX_INIT 0 63 #define __GTHREAD_RECURSIVE_MUTEX_INIT 0 64 65 static inline int 66 __gthread_once (__gthread_once_t *__once __attribute__((unused)), 67 void (*__func) (void) __attribute__((unused))) 68 { 69 return 0; 70 } 71 72 static inline int 73 __gthread_key_create (__gthread_key_t *__key __attribute__((unused)), 74 void (*__dtor) (void *) __attribute__((unused))) 75 { 76 /* Operation is not supported. */ 77 return -1; 78 } 79 80 static inline int 81 __gthread_key_delete (__gthread_key_t __key __attribute__ ((__unused__))) 82 { 83 /* Operation is not supported. */ 84 return -1; 85 } 86 87 static inline void * 88 __gthread_getspecific (__gthread_key_t __key __attribute__((unused))) 89 { 90 return NULL; 91 } 92 93 static inline int 94 __gthread_setspecific (__gthread_key_t __key __attribute__((unused)), 95 const void *__ptr __attribute__((unused))) 96 { 97 /* Operation is not supported. */ 98 return -1; 99 } 100 101 static inline int 102 __gthread_mutex_destroy (__gthread_mutex_t *__mutex __attribute__((unused))) 103 { 104 return 0; 105 } 106 107 static inline int 108 __gthread_recursive_mutex_destroy (__gthread_recursive_mutex_t *__mutex __attribute__((unused))) 109 { 110 return 0; 111 } 112 113 114 static inline int 115 __gthread_mutex_lock (__gthread_mutex_t *__mutex) 116 { 117 while (__sync_lock_test_and_set (__mutex, 1)) 118 asm volatile ("s_sleep\t1" ::: "memory"); 119 120 return 0; 121 } 122 123 static inline int 124 __gthread_mutex_trylock (__gthread_mutex_t *__mutex) 125 { 126 return __sync_lock_test_and_set (__mutex, 1); 127 } 128 129 static inline int 130 __gthread_mutex_unlock (__gthread_mutex_t *__mutex) 131 { 132 __sync_lock_release (__mutex); 133 134 return 0; 135 } 136 137 static inline int 138 __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex __attribute__((unused))) 139 { 140 /* Operation is not supported. */ 141 return -1; 142 } 143 144 static inline int 145 __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex __attribute__((unused))) 146 { 147 /* Operation is not supported. */ 148 return -1; 149 } 150 151 static inline int 152 __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex __attribute__((unused))) 153 { 154 /* Operation is not supported. */ 155 return -1; 156 } 157 #endif /* _LIBOBJC */ 158 159 #ifdef __cplusplus 160 } 161 #endif 162 163 #endif /* ! GCC_GTHR_GCN_H */ 164