libgcc/config/gthr-vxworks.h

   1 /* Threads compatibility routines for libgcc2 and libobjc for VxWorks.  */
   2 /* Compile this one with gcc.  */
   3 /* Copyright (C) 1997-2018 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 */