release/src/router/glib/gthread/gthread-posix.c

   1 /* GLIB - Library of useful routines for C programming
   2  * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * gthread.c: posix thread system implementation
   5  * Copyright 1998 Sebastian Wilhelmi; University of Karlsruhe
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Library General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library 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 GNU
  15  * Library General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Library General Public
  18  * License along with this library; if not, write to the
  19  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20  * Boston, MA 02111-1307, USA.
  21  */
  22
  23 /*
  24  * Modified by the GLib Team and others 1997-1999.  See the AUTHORS
  25  * file for a list of people on the GLib Team.  See the ChangeLog
  26  * files for a list of changes.  These files are distributed with
  27  * GLib at ftp://ftp.gtk.org/pub/gtk/.
  28  */
  29
  30 /*
  31  * MT safe
  32  */
  33
  34 #include <pthread.h>
  35 #include <errno.h>
  36 #include <stdlib.h>
  37 #ifdef HAVE_SYS_TIME_H
  38 #include <sys/time.h>
  39 #endif
  40
  41 #define posix_print_error( name, num )                          \
  42   g_error( "file %s: line %d (%s): error %s during %s",         \
  43            __FILE__, __LINE__, G_GNUC_PRETTY_FUNCTION,          \
  44            g_strerror((num)), #name )
  45
  46 #define posix_check_for_error( what ) G_STMT_START{             \
  47   int error = (what);                                           \
  48   if( error ) { posix_print_error( what, error ); }             \
  49   }G_STMT_END
  50
  51 static GMutex *
  52 g_mutex_new_posix_impl (void)
  53 {
  54   GMutex *result = (GMutex *) g_new (pthread_mutex_t, 1);
  55   posix_check_for_error (pthread_mutex_init ((pthread_mutex_t *) result, NULL));
  56   return result;
  57 }
  58
  59 static void
  60 g_mutex_free_posix_impl (GMutex * mutex)
  61 {
  62   posix_check_for_error (pthread_mutex_destroy ((pthread_mutex_t *) mutex));
  63   g_free (mutex);
  64 }
  65
  66 /* NOTE: the functions g_mutex_lock and g_mutex_unlock may not use
  67    functions from gmem.c and gmessages.c; */
  68
  69 /* pthread_mutex_lock, pthread_mutex_unlock can be taken directly, as
  70    signature and semantic are right, but without error check then!!!!,
  71    we might want to change this therefore. */
  72
  73 static gboolean
  74 g_mutex_trylock_posix_impl (GMutex * mutex)
  75 {
  76   int result;
  77
  78   result = pthread_mutex_trylock ((pthread_mutex_t *) mutex);
  79 #ifdef HAVE_PTHREAD_MUTEX_TRYLOCK_POSIX
  80   if (result == EBUSY)
  81     return FALSE;
  82   posix_check_for_error (result);
  83 #else
  84   if (result == 0)
  85     return FALSE;
  86 #endif
  87   return TRUE;
  88 }
  89
  90 static GCond *
  91 g_cond_new_posix_impl (void)
  92 {
  93   GCond *result = (GCond *) g_new (pthread_cond_t, 1);
  94   posix_check_for_error (pthread_cond_init ((pthread_cond_t *) result, NULL));
  95   return result;
  96 }
  97
  98 /* pthread_cond_signal, pthread_cond_broadcast and pthread_cond_wait
  99    can be taken directly, as signature and semantic are right, but
 100    without error check then!!!!, we might want to change this
 101    therfore. */
 102
 103 #define G_MICROSEC 1000000
 104 #define G_NANOSEC 1000000000
 105
 106 static gboolean
 107 g_cond_timed_wait_posix_impl (GCond * cond,
 108                               GMutex * entered_mutex,
 109                               GTimeVal * abs_time)
 110 {
 111   int result;
 112   struct timespec end_time;
 113   gboolean timed_out;
 114
 115   g_return_val_if_fail (cond != NULL, FALSE);
 116   g_return_val_if_fail (entered_mutex != NULL, FALSE);
 117
 118   if (!abs_time)
 119     {
 120       g_cond_wait (cond, entered_mutex);
 121       return TRUE;
 122     }
 123
 124   end_time.tv_sec = abs_time->tv_sec;
 125   end_time.tv_nsec = abs_time->tv_usec * (G_NANOSEC / G_MICROSEC);
 126   g_assert (end_time.tv_nsec < G_NANOSEC);
 127   result = pthread_cond_timedwait ((pthread_cond_t *) cond,
 128                                    (pthread_mutex_t *) entered_mutex,
 129                                    &end_time);
 130 #ifdef HAVE_PTHREAD_COND_TIMEDWAIT_POSIX
 131   timed_out = (result == ETIMEDOUT);
 132 #else
 133   timed_out = (result == -1 && errno == EAGAIN);
 134 #endif
 135   if (!timed_out)
 136     posix_check_for_error (result);
 137   return !timed_out;
 138 }
 139
 140 static void
 141 g_cond_free_posix_impl (GCond * cond)
 142 {
 143   posix_check_for_error (pthread_cond_destroy ((pthread_cond_t *) cond));
 144   g_free (cond);
 145 }
 146
 147 static GPrivate *
 148 g_private_new_posix_impl (GDestroyNotify destructor)
 149 {
 150   GPrivate *result = (GPrivate *) g_new (pthread_key_t, 1);
 151   posix_check_for_error (pthread_key_create ((pthread_key_t *) result,
 152                                              destructor));
 153   return result;
 154 }
 155
 156 /* NOTE: the functions g_private_get and g_private_set may not use
 157    functions from gmem.c and gmessages.c */
 158
 159 static void
 160 g_private_set_posix_impl (GPrivate * private_key, gpointer value)
 161 {
 162   if (!private_key)
 163     return;
 164
 165   pthread_setspecific (*(pthread_key_t *) private_key, value);
 166 }
 167
 168 static gpointer
 169 g_private_get_posix_impl (GPrivate * private_key)
 170 {
 171   if (!private_key)
 172     return NULL;
 173 #ifdef HAVE_PTHREAD_GETSPECIFIC_POSIX
 174   return pthread_getspecific (*(pthread_key_t *) private_key);
 175 #else /* HAVE_PTHREAD_GETSPECIFIC_POSIX */
 176   {
 177     void* data;
 178     pthread_getspecific (*(pthread_key_t *) private_key, &data);
 179     return data;
 180   }
 181 #endif /* HAVE_PTHREAD_GETSPECIFIC_POSIX */
 182 }
 183
 184 static GThreadFunctions g_thread_functions_for_glib_use_default =
 185 {
 186   g_mutex_new_posix_impl,
 187   (void (*)(GMutex *)) pthread_mutex_lock,
 188   g_mutex_trylock_posix_impl,
 189   (void (*)(GMutex *)) pthread_mutex_unlock,
 190   g_mutex_free_posix_impl,
 191   g_cond_new_posix_impl,
 192   (void (*)(GCond *)) pthread_cond_signal,
 193   (void (*)(GCond *)) pthread_cond_broadcast,
 194   (void (*)(GCond *, GMutex *)) pthread_cond_wait,
 195   g_cond_timed_wait_posix_impl,
 196   g_cond_free_posix_impl,
 197   g_private_new_posix_impl,
 198   g_private_get_posix_impl,
 199   g_private_set_posix_impl
 200 };