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
43int
44__gnat_pthread_condattr_setup(pthread_condattr_t *attr) {
45  return pthread_condattr_setclock (attr, CLOCK_RT_Ada);
46}
47
48#else
49
50int
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
66int
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}
89