1/* Threads compatibility routines for libgcc2 and libobjc for VxWorks. */ 2/* Compile this one with gcc. */ 3/* Copyright (C) 1997-2015 Free Software Foundation, Inc. 4 Contributed by Mike Stump <mrs@wrs.com>. 5 6This file is part of GCC. 7 8GCC is free software; you can redistribute it and/or modify it under 9the terms of the GNU General Public License as published by the Free 10Software Foundation; either version 3, or (at your option) any later 11version. 12 13GCC is distributed in the hope that it will be useful, but WITHOUT ANY 14WARRANTY; without even the implied warranty of MERCHANTABILITY or 15FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 16for more details. 17 18Under Section 7 of GPL version 3, you are granted additional 19permissions described in the GCC Runtime Library Exception, version 203.1, as published by the Free Software Foundation. 21 22You should have received a copy of the GNU General Public License and 23a copy of the GCC Runtime Library Exception along with this program; 24see 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 43extern "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 53typedef SEM_ID __gthread_mutex_t; 54/* All VxWorks mutexes are recursive. */ 55typedef 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 59static 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 65static inline int 66__gthread_mutex_destroy (__gthread_mutex_t * UNUSED(mutex)) 67{ 68 return 0; 69} 70 71static inline int 72__gthread_mutex_lock (__gthread_mutex_t *mutex) 73{ 74 return semTake (*mutex, WAIT_FOREVER); 75} 76 77static inline int 78__gthread_mutex_trylock (__gthread_mutex_t *mutex) 79{ 80 return semTake (*mutex, NO_WAIT); 81} 82 83static inline int 84__gthread_mutex_unlock (__gthread_mutex_t *mutex) 85{ 86 return semGive (*mutex); 87} 88 89static inline void 90__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex) 91{ 92 __gthread_mutex_init_function (mutex); 93} 94 95static inline int 96__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex) 97{ 98 return __gthread_mutex_lock (mutex); 99} 100 101static inline int 102__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex) 103{ 104 return __gthread_mutex_trylock (mutex); 105} 106 107static inline int 108__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex) 109{ 110 return __gthread_mutex_unlock (mutex); 111} 112 113static 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 122typedef 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 152extern 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 159typedef unsigned int __gthread_key_t; 160 161extern int __gthread_key_create (__gthread_key_t *__keyp, void (*__dtor)(void *)); 162extern int __gthread_key_delete (__gthread_key_t __key); 163 164extern void *__gthread_getspecific (__gthread_key_t __key); 165extern 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