1 /* Threads compatibility routines for libgcc2 and libobjc for VxWorks. */ 2 /* Compile this one with gcc. */ 3 /* Copyright (C) 1997-2019 Free Software Foundation, Inc. 4 Contributed by Mike Stump <mrs@wrs.com>. 5 6 This file is part of GCC. 7 8 GCC is free software; you can redistribute it and/or modify it under 9 the terms of the GNU General Public License as published by the Free 10 Software Foundation; either version 3, or (at your option) any later 11 version. 12 13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 14 WARRANTY; without even the implied warranty of MERCHANTABILITY or 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 16 for more details. 17 18 Under Section 7 of GPL version 3, you are granted additional 19 permissions described in the GCC Runtime Library Exception, version 20 3.1, as published by the Free Software Foundation. 21 22 You should have received a copy of the GNU General Public License and 23 a copy of the GCC Runtime Library Exception along with this program; 24 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 25 <http://www.gnu.org/licenses/>. */ 26 27 #ifndef GCC_GTHR_VXWORKS_H 28 #define GCC_GTHR_VXWORKS_H 29 30 #ifdef _LIBOBJC 31 32 /* libobjc requires the optional pthreads component. */ 33 #include "gthr-posix.h" 34 35 #else 36 #ifdef __cplusplus 37 #define UNUSED(x) 38 #else 39 #define UNUSED(x) x __attribute__((__unused__)) 40 #endif 41 42 #ifdef __cplusplus 43 extern "C" { 44 #endif 45 46 #define __GTHREADS 1 47 #define __gthread_active_p() 1 48 49 /* Mutexes are easy, except that they need to be initialized at runtime. */ 50 51 #include <semLib.h> 52 53 typedef SEM_ID __gthread_mutex_t; 54 /* All VxWorks mutexes are recursive. */ 55 typedef SEM_ID __gthread_recursive_mutex_t; 56 #define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function 57 #define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function 58 59 static inline void 60 __gthread_mutex_init_function (__gthread_mutex_t *mutex) 61 { 62 *mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE); 63 } 64 65 static inline int 66 __gthread_mutex_destroy (__gthread_mutex_t *mutex) 67 { 68 semDelete(*mutex); 69 return 0; 70 } 71 72 static inline int 73 __gthread_mutex_lock (__gthread_mutex_t *mutex) 74 { 75 return semTake (*mutex, WAIT_FOREVER); 76 } 77 78 static inline int 79 __gthread_mutex_trylock (__gthread_mutex_t *mutex) 80 { 81 return semTake (*mutex, NO_WAIT); 82 } 83 84 static inline int 85 __gthread_mutex_unlock (__gthread_mutex_t *mutex) 86 { 87 return semGive (*mutex); 88 } 89 90 static inline void 91 __gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex) 92 { 93 __gthread_mutex_init_function (mutex); 94 } 95 96 static inline int 97 __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex) 98 { 99 return __gthread_mutex_lock (mutex); 100 } 101 102 static inline int 103 __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex) 104 { 105 return __gthread_mutex_trylock (mutex); 106 } 107 108 static inline int 109 __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex) 110 { 111 return __gthread_mutex_unlock (mutex); 112 } 113 114 static inline int 115 __gthread_recursive_mutex_destroy (__gthread_recursive_mutex_t *__mutex) 116 { 117 return __gthread_mutex_destroy (__mutex); 118 } 119 120 /* pthread_once is complicated enough that it's implemented 121 out-of-line. See config/vxlib.c. */ 122 123 typedef struct 124 { 125 #if !defined(__RTP__) 126 #if defined(__PPC__) 127 __attribute ((aligned (__alignof (unsigned)))) 128 #endif 129 volatile unsigned char busy; 130 #endif 131 volatile unsigned char done; 132 #if !defined(__RTP__) && defined(__PPC__) 133 /* PPC's test-and-set implementation requires a 4 byte aligned 134 object, of which it only sets the first byte. We use padding 135 here, in order to maintain some amount of backwards 136 compatibility. Without this padding, gthread_once objects worked 137 by accident because they happen to be static objects and the ppc 138 port automatically increased their alignment to 4 bytes. */ 139 unsigned char pad1; 140 unsigned char pad2; 141 #endif 142 } 143 __gthread_once_t; 144 145 #if defined (__RTP__) 146 # define __GTHREAD_ONCE_INIT { 0 } 147 #elif defined (__PPC__) 148 # define __GTHREAD_ONCE_INIT { 0, 0, 0, 0 } 149 #else 150 # define __GTHREAD_ONCE_INIT { 0, 0 } 151 #endif 152 153 extern int __gthread_once (__gthread_once_t *__once, void (*__func)(void)); 154 155 /* Thread-specific data requires a great deal of effort, since VxWorks 156 is not really set up for it. See config/vxlib.c for the gory 157 details. All the TSD routines are sufficiently complex that they 158 need to be implemented out of line. */ 159 160 typedef unsigned int __gthread_key_t; 161 162 extern int __gthread_key_create (__gthread_key_t *__keyp, void (*__dtor)(void *)); 163 extern int __gthread_key_delete (__gthread_key_t __key); 164 165 extern void *__gthread_getspecific (__gthread_key_t __key); 166 extern int __gthread_setspecific (__gthread_key_t __key, void *__ptr); 167 168 #undef UNUSED 169 170 #ifdef __cplusplus 171 } 172 #endif 173 174 #endif /* not _LIBOBJC */ 175 176 #endif /* gthr-vxworks.h */ 177