1 /* Threads compatibility routines for libgcc2 and libobjc for VxWorks. */ 2 /* Compile this one with gcc. */ 3 /* Copyright (C) 1997, 1999, 2000, 2008, 2009, 2011 4 Free Software Foundation, Inc. 5 Contributed by Mike Stump <mrs@wrs.com>. 6 7 This file is part of GCC. 8 9 GCC is free software; you can redistribute it and/or modify it under 10 the terms of the GNU General Public License as published by the Free 11 Software Foundation; either version 3, or (at your option) any later 12 version. 13 14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 15 WARRANTY; without even the implied warranty of MERCHANTABILITY or 16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 17 for more details. 18 19 Under Section 7 of GPL version 3, you are granted additional 20 permissions described in the GCC Runtime Library Exception, version 21 3.1, as published by the Free Software Foundation. 22 23 You should have received a copy of the GNU General Public License and 24 a copy of the GCC Runtime Library Exception along with this program; 25 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 26 <http://www.gnu.org/licenses/>. */ 27 28 #ifndef GCC_GTHR_VXWORKS_H 29 #define GCC_GTHR_VXWORKS_H 30 31 #ifdef _LIBOBJC 32 33 /* libobjc requires the optional pthreads component. */ 34 #include "gthr-posix.h" 35 36 #else 37 #ifdef __cplusplus 38 #define UNUSED(x) 39 #else 40 #define UNUSED(x) x __attribute__((unused)) 41 #endif 42 43 #ifdef __cplusplus 44 extern "C" { 45 #endif 46 47 #define __GTHREADS 1 48 #define __gthread_active_p() 1 49 50 /* Mutexes are easy, except that they need to be initialized at runtime. */ 51 52 #include <semLib.h> 53 54 typedef SEM_ID __gthread_mutex_t; 55 /* All VxWorks mutexes are recursive. */ 56 typedef SEM_ID __gthread_recursive_mutex_t; 57 #define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function 58 #define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function 59 60 static inline void 61 __gthread_mutex_init_function (__gthread_mutex_t *mutex) 62 { 63 *mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE); 64 } 65 66 static inline int 67 __gthread_mutex_destroy (__gthread_mutex_t * UNUSED(mutex)) 68 { 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 /* pthread_once is complicated enough that it's implemented 115 out-of-line. See config/vxlib.c. */ 116 117 typedef struct 118 { 119 #if !defined(__RTP__) 120 #if defined(__PPC__) 121 __attribute ((aligned (__alignof (unsigned)))) 122 #endif 123 volatile unsigned char busy; 124 #endif 125 volatile unsigned char done; 126 #if !defined(__RTP__) && defined(__PPC__) 127 /* PPC's test-and-set implementation requires a 4 byte aligned 128 object, of which it only sets the first byte. We use padding 129 here, in order to maintain some amount of backwards 130 compatibility. Without this padding, gthread_once objects worked 131 by accident because they happen to be static objects and the ppc 132 port automatically increased their alignment to 4 bytes. */ 133 unsigned char pad1; 134 unsigned char pad2; 135 #endif 136 } 137 __gthread_once_t; 138 139 #if defined (__RTP__) 140 # define __GTHREAD_ONCE_INIT { 0 } 141 #elif defined (__PPC__) 142 # define __GTHREAD_ONCE_INIT { 0, 0, 0, 0 } 143 #else 144 # define __GTHREAD_ONCE_INIT { 0, 0 } 145 #endif 146 147 extern int __gthread_once (__gthread_once_t *__once, void (*__func)(void)); 148 149 /* Thread-specific data requires a great deal of effort, since VxWorks 150 is not really set up for it. See config/vxlib.c for the gory 151 details. All the TSD routines are sufficiently complex that they 152 need to be implemented out of line. */ 153 154 typedef unsigned int __gthread_key_t; 155 156 extern int __gthread_key_create (__gthread_key_t *__keyp, void (*__dtor)(void *)); 157 extern int __gthread_key_delete (__gthread_key_t __key); 158 159 extern void *__gthread_getspecific (__gthread_key_t __key); 160 extern int __gthread_setspecific (__gthread_key_t __key, void *__ptr); 161 162 #undef UNUSED 163 164 #ifdef __cplusplus 165 } 166 #endif 167 168 #endif /* not _LIBOBJC */ 169 170 #endif /* gthr-vxworks.h */ 171