gcc/gthr-solaris.h

   1 /* Threads compatibility routines for libgcc2.  */
   2 /* Compile this one with gcc.  */
   3 /* Copyright (C) 1997 Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 /* As a special exception, if you link this library with other files,
  23    some of which are compiled with GCC, to produce an executable,
  24    this library does not by itself cause the resulting executable
  25    to be covered by the GNU General Public License.
  26    This exception does not however invalidate any other reasons why
  27    the executable file might be covered by the GNU General Public License.  */
  28
  29 #ifndef __gthr_solaris_h
  30 #define __gthr_solaris_h
  31
  32 /* Solaris threads as found in Solaris 2.[456].
  33    Actually these are Unix International (UI) threads, but I don't
  34    know if anyone else implements these. */
  35
  36 #define __GTHREADS 1
  37
  38 #include <thread.h>
  39 #include <errno.h>
  40
  41 typedef thread_key_t __gthread_key_t;
  42 typedef struct
  43 {
  44   mutex_t mutex;
  45   int once;
  46 } __gthread_once_t;
  47 typedef mutex_t __gthread_mutex_t;
  48
  49 #define __GTHREAD_ONCE_INIT { DEFAULTMUTEX, 0 }
  50 #define __GTHREAD_MUTEX_INIT DEFAULTMUTEX
  51
  52 #if SUPPORTS_WEAK && GTHREAD_USE_WEAK
  53
  54 #pragma weak thr_keycreate
  55 #pragma weak thr_getspecific
  56 #pragma weak thr_setspecific
  57 #pragma weak thr_create
  58
  59 #pragma weak mutex_lock
  60 #pragma weak mutex_trylock
  61 #pragma weak mutex_unlock
  62
  63 /* This will not actually work in Solaris 2.5, since libc contains
  64    dummy symbols of all thr_* routines. */
  65
  66 static void *__gthread_active_ptr = &thr_create;
  67
  68 static inline int
  69 __gthread_active_p (void)
  70 {
  71   return __gthread_active_ptr != 0;
  72 }
  73
  74 #else /* not SUPPORTS_WEAK */
  75
  76 static inline int
  77 __gthread_active_p (void)
  78 {
  79   return 1;
  80 }
  81
  82 #endif /* SUPPORTS_WEAK */
  83
  84 static inline int
  85 __gthread_once (__gthread_once_t *once, void (*func) (void))
  86 {
  87   if (! __gthread_active_p ())
  88     return -1;
  89
  90   if (once == 0 || func == 0)
  91     return EINVAL;
  92
  93   if (once->once == 0)
  94     {
  95       int status = mutex_lock (&once->mutex);
  96       if (status != 0)
  97         return status;
  98       if (once->once == 0)
  99         {
 100           (*func) ();
 101           once->once ++;
 102         }
 103       mutex_unlock (&once->mutex);
 104     }
 105   return 0;
 106 }
 107
 108 static inline int
 109 __gthread_key_create (__gthread_key_t *key, void (*dtor) (void *))
 110 {
 111   /* Solaris 2.5 contains thr_* routines no-op in libc, so test if we actually
 112      got a reasonable key value, and if not, fail. */
 113   *key = -1;
 114   if (thr_keycreate (key, dtor) != 0 || *key == -1)
 115     return -1;
 116   else
 117     return 0;
 118 }
 119
 120 static inline int
 121 __gthread_key_dtor (__gthread_key_t key, void *ptr)
 122 {
 123   /* Nothing needed. */
 124   return 0;
 125 }
 126
 127 static inline int
 128 __gthread_key_delete (__gthread_key_t key)
 129 {
 130   /* Not possible. */
 131   return -1;
 132 }
 133
 134 static inline void *
 135 __gthread_getspecific (__gthread_key_t key)
 136 {
 137   void *ptr;
 138   if (thr_getspecific (key, &ptr) == 0)
 139     return ptr;
 140   else
 141     return 0;
 142 }
 143
 144 static inline int
 145 __gthread_setspecific (__gthread_key_t key, const void *ptr)
 146 {
 147   return thr_setspecific (key, (void *) ptr);
 148 }
 149
 150 static inline int
 151 __gthread_mutex_lock (__gthread_mutex_t *mutex)
 152 {
 153   if (__gthread_active_p ())
 154     return mutex_lock (mutex);
 155   else
 156     return 0;
 157 }
 158
 159 static inline int
 160 __gthread_mutex_trylock (__gthread_mutex_t *mutex)
 161 {
 162   if (__gthread_active_p ())
 163     return mutex_trylock (mutex);
 164   else
 165     return 0;
 166 }
 167
 168 static inline int
 169 __gthread_mutex_unlock (__gthread_mutex_t *mutex)
 170 {
 171   if (__gthread_active_p ())
 172     return mutex_unlock (mutex);
 173   else
 174     return 0;
 175 }
 176
 177 #endif /* not __gthr_solaris_h */