gcc/ada/thread.c

   1 /****************************************************************************
   2  *                                                                          *
   3  *                         GNAT COMPILER COMPONENTS                         *
   4  *                                                                          *
   5  *                              P T H R E A D                               *
   6  *                                                                          *
   7  *                          C Implementation File                           *
   8  *                                                                          *
   9  *             Copyright (C) 2011, Free Software Foundation, Inc.           *
  10  *                                                                          *
  11  * GNAT is free software;  you can  redistribute it  and/or modify it under *
  12  * terms of the  GNU General Public License as published  by the Free Soft- *
  13  * ware  Foundation;  either version 3,  or (at your option) any later ver- *
  14  * sion.  GNAT is distributed in the hope that it will be useful, but WITH- *
  15  * OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY *
  16  * or FITNESS FOR A PARTICULAR PURPOSE.                                     *
  17  *                                                                          *
  18  * As a special exception under Section 7 of GPL version 3, you are granted *
  19  * additional permissions described in the GCC Runtime Library Exception,   *
  20  * version 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  * GNAT was originally developed  by the GNAT team at  New York University. *
  28  * Extensive contributions were provided by Ada Core Technologies Inc.      *
  29  *                                                                          *
  30  ****************************************************************************/
  31
  32 /*  This file provides utility functions to access the threads API          */
  33
  34 #include "s-oscons.h"
  35
  36 #ifdef NEED_PTHREAD_CONDATTR_SETCLOCK
  37 # include <pthread.h>
  38 # include <time.h>
  39
  40 #ifndef _AIXVERSION_530
  41 /* We use the same runtime library for AIX 5.2 and 5.3, but pthread_condattr_
  42  * setclock exists only on the latter, so for the former provide a dummy
  43  * implementation (declared below, weak symbol defined in init.c).
  44  *
  45  * Note: this means that under AIX 5.2 we'll be using CLOCK_MONOTONIC
  46  * timestamps from clock_gettime() as arguments to pthread_cond_timedwait,
  47  * which expects a CLOCK_REALTIME value, which is technically wrong, but
  48  * inocuous in practice on that particular platform since both clocks happen
  49  * to use close epochs.
  50  */
  51
  52 extern int pthread_condattr_setclock (pthread_condattr_t *attr, clockid_t cl);
  53 #endif
  54
  55 int
  56 __gnat_pthread_condattr_setup(pthread_condattr_t *attr) {
  57 /*
  58  * If using a clock other than CLOCK_REALTIME for the Ada Monotonic_Clock,
  59  * the corresponding clock id must be set for condition variables.
  60  */
  61   return pthread_condattr_setclock (attr, CLOCK_RT_Ada);
  62 }
  63
  64 #else
  65
  66 int
  67 __gnat_pthread_condattr_setup (void *attr) {
  68   /* Dummy version for other platforms, which may or may not have pthread.h */
  69   return 0;
  70 }
  71
  72 #endif