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) 2011-2014, 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 /* If the clock we used for tasking (CLOCK_RT_Ada) is not the default
  37  * CLOCK_REALTIME, we need to set cond var attributes accordingly.
  38  */
  39 #if CLOCK_RT_Ada != CLOCK_REALTIME
  40 # include <pthread.h>
  41 # include <time.h>
  42
  43 int
  44 __gnat_pthread_condattr_setup(pthread_condattr_t *attr) {
  45   return pthread_condattr_setclock (attr, CLOCK_RT_Ada);
  46 }
  47
  48 #else
  49
  50 int
  51 __gnat_pthread_condattr_setup (void *attr) {
  52   /* Dummy version for other platforms, which may or may not have pthread.h */
  53   return 0;
  54 }
  55
  56 #endif
  57
  58 #if defined (__APPLE__)
  59 #include <mach/mach.h>
  60 #include <mach/clock.h>
  61 #endif
  62
  63 /* Return the clock ticks per nanosecond for Posix systems lacking the
  64    Posix extension function clock_getres, or else 0 nsecs on error.  */
  65
  66 int
  67 __gnat_clock_get_res (void)
  68 {
  69 #if defined (__APPLE__)
  70   clock_serv_t clock_port;
  71   mach_msg_type_number_t count;
  72   int nsecs;
  73   int result;
  74
  75   count = 1;
  76   result = host_get_clock_service
  77     (mach_host_self (), SYSTEM_CLOCK, &clock_port);
  78
  79   if (result == KERN_SUCCESS)
  80     result = clock_get_attributes (clock_port, CLOCK_GET_TIME_RES,
  81       (clock_attr_t) &nsecs, &count);
  82
  83   if (result == KERN_SUCCESS)
  84     return nsecs;
  85 #endif
  86
  87   return 0;
  88 }