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  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.  
  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.