1/* Threads compatibily routines for libgcc2 for VxWorks. */ 2/* Compile this one with gcc. */ 3/* Copyright (C) 1997 Free Software Foundation, Inc. 4 Contributed by Mike Stump <mrs@wrs.com>. 5 6This file is part of GNU CC. 7 8GNU CC is free software; you can redistribute it and/or modify 9it under the terms of the GNU General Public License as published by 10the Free Software Foundation; either version 2, or (at your option) 11any later version. 12 13GNU CC is distributed in the hope that it will be useful, 14but WITHOUT ANY WARRANTY; without even the implied warranty of 15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16GNU General Public License for more details. 17 18You should have received a copy of the GNU General Public License 19along with GNU CC; see the file COPYING. If not, write to 20the Free Software Foundation, 59 Temple Place - Suite 330, 21Boston, MA 02111-1307, USA. */ 22 23/* As a special exception, if you link this library with other files, 24 some of which are compiled with GCC, to produce an executable, 25 this library does not by itself cause the resulting executable 26 to be covered by the GNU General Public License. 27 This exception does not however invalidate any other reasons why 28 the executable file might be covered by the GNU General Public License. */ 29 30#ifndef __gthr_vxworks_h 31#define __gthr_vxworks_h 32 33/* POSIX threads specific definitions. 34 Easy, since the interface is just one-to-one mapping. */ 35 36#define __GTHREADS 1 37 38#include <vxWorks.h> 39#include <semLib.h> 40/* typedef void *SEM_ID; */ 41 42typedef int __gthread_key_t; 43typedef char __gthread_once_t; 44typedef SEM_ID __gthread_mutex_t; 45 46#define __GTHREAD_MUTEX_INIT 0 47#define __GTHREAD_ONCE_INIT 0 48 49#ifndef REG_SAVED_REG 50static inline int 51__gthread_once (__gthread_once_t *once, void (*func) ()) 52{ 53 (*func)(); 54 return 0; 55} 56 57extern __gthread_key_t eh_context_key; 58 59/* This is not the right way to do it, but the semantic of pthreads 60 don't map well enough onto VxWorks. */ 61 62static void 63__ehdtor (void *pTcb) 64{ 65 int tid = (int) pTcb; 66 void *p = (void*)taskVarGet(tid, &eh_context_key); 67 if (p != (void*)-1) 68 { 69 if (p) 70 free (p); 71 taskVarSet(tid, &eh_context_key, 0); 72 } 73} 74 75/* This only works for the code in libgcc2.c. */ 76 77static inline int 78__gthread_key_create (__gthread_key_t *key, void (*dtor) (void *)) 79{ 80 *key = 0; 81 82 /* Do this first so that the task variables are visible during the 83 running of the delete hook. */ 84 85 taskVarInit(); 86 87 /* We don't have a way to track dtor here, so instead, we 88 register a generic routine that can cleanup any task. */ 89 90 taskDeleteHookAdd (__ehdtor); 91 92 return 0; 93} 94 95#define __gthread_setspecific(key, ptr) \ 96 (key = (int) ptr, 0) 97 98static inline int 99__gthread_key_dtor (__gthread_key_t key, void *ptr) 100{ 101 /* Just reset the key value to zero. */ 102 if (ptr) 103 return __gthread_setspecific (key, 0); 104 else 105 return 0; 106} 107 108#define __gthread_key_delete(key) \ 109 taskVarDelete (taskIdSelf (), &key) 110 111#define __gthread_getspecific(key) \ 112 ((key == 0) \ 113 ? ((taskVarAdd (taskIdSelf (), &key) != OK) \ 114 ? (__terminate (), (void*)0) \ 115 : (void*)0) \ 116 : (void*)key) 117#endif 118 119static inline int 120__gthread_mutex_lock (__gthread_mutex_t *mutex) 121{ 122 if (*mutex == 0) 123 *mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE); 124 return semTake (*mutex, WAIT_FOREVER); 125} 126 127static inline int 128__gthread_mutex_trylock (__gthread_mutex_t *mutex) 129{ 130 if (*mutex == 0) 131 *mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE); 132 return semTake (*mutex, NO_WAIT); 133} 134 135static inline int 136__gthread_mutex_unlock (__gthread_mutex_t *mutex) 137{ 138 /* We could return the */ 139 return semGive (*mutex); 140} 141 142#endif /* not __gthr_vxworks_h */ 143