1 /* Threads compatibility routines for libgcc2 and libobjc for VxWorks. */ 2 /* Compile this one with gcc. */ 3 /* Copyright (C) 1997-2013 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 * UNUSED(mutex)) 67 { 68 return 0; 69 } 70 71 static inline int 72 __gthread_mutex_lock (__gthread_mutex_t *mutex) 73 { 74 return semTake (*mutex, WAIT_FOREVER); 75 } 76 77 static inline int 78 __gthread_mutex_trylock (__gthread_mutex_t *mutex) 79 { 80 return semTake (*mutex, NO_WAIT); 81 } 82 83 static inline int 84 __gthread_mutex_unlock (__gthread_mutex_t *mutex) 85 { 86 return semGive (*mutex); 87 } 88 89 static inline void 90 __gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex) 91 { 92 __gthread_mutex_init_function (mutex); 93 } 94 95 static inline int 96 __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex) 97 { 98 return __gthread_mutex_lock (mutex); 99 } 100 101 static inline int 102 __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex) 103 { 104 return __gthread_mutex_trylock (mutex); 105 } 106 107 static inline int 108 __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex) 109 { 110 return __gthread_mutex_unlock (mutex); 111 } 112 113 static inline int 114 __gthread_recursive_mutex_destroy (__gthread_recursive_mutex_t *__mutex) 115 { 116 return __gthread_mutex_destroy (__mutex); 117 } 118 119 /* pthread_once is complicated enough that it's implemented 120 out-of-line. See config/vxlib.c. */ 121 122 typedef struct 123 { 124 #if !defined(__RTP__) 125 #if defined(__PPC__) 126 __attribute ((aligned (__alignof (unsigned)))) 127 #endif 128 volatile unsigned char busy; 129 #endif 130 volatile unsigned char done; 131 #if !defined(__RTP__) && defined(__PPC__) 132 /* PPC's test-and-set implementation requires a 4 byte aligned 133 object, of which it only sets the first byte. We use padding 134 here, in order to maintain some amount of backwards 135 compatibility. Without this padding, gthread_once objects worked 136 by accident because they happen to be static objects and the ppc 137 port automatically increased their alignment to 4 bytes. */ 138 unsigned char pad1; 139 unsigned char pad2; 140 #endif 141 } 142 __gthread_once_t; 143 144 #if defined (__RTP__) 145 # define __GTHREAD_ONCE_INIT { 0 } 146 #elif defined (__PPC__) 147 # define __GTHREAD_ONCE_INIT { 0, 0, 0, 0 } 148 #else 149 # define __GTHREAD_ONCE_INIT { 0, 0 } 150 #endif 151 152 extern int __gthread_once (__gthread_once_t *__once, void (*__func)(void)); 153 154 /* Thread-specific data requires a great deal of effort, since VxWorks 155 is not really set up for it. See config/vxlib.c for the gory 156 details. All the TSD routines are sufficiently complex that they 157 need to be implemented out of line. */ 158 159 typedef unsigned int __gthread_key_t; 160 161 extern int __gthread_key_create (__gthread_key_t *__keyp, void (*__dtor)(void *)); 162 extern int __gthread_key_delete (__gthread_key_t __key); 163 164 extern void *__gthread_getspecific (__gthread_key_t __key); 165 extern int __gthread_setspecific (__gthread_key_t __key, void *__ptr); 166 167 #undef UNUSED 168 169 #ifdef __cplusplus 170 } 171 #endif 172 173 #endif /* not _LIBOBJC */ 174 175 #endif /* gthr-vxworks.h */ 176