1 /****************************************************************************
2  *                                                                          *
3  *                         GNAT COMPILER COMPONENTS                         *
4  *                                                                          *
5  *                              P T H R E A D                               *
6  *                                                                          *
7  *                          C Implementation File                           *
8  *                                                                          *
9  *          Copyright (C) 2011-2019, 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
__gnat_pthread_condattr_setup(pthread_condattr_t * attr)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
__gnat_pthread_condattr_setup(void * attr)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
__gnat_clock_get_res(void)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