1/* Block a thread with a timeout. Mach version.
2 Copyright (C) 2000-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <assert.h>
20#include <errno.h>
21#include <time.h>
22#include <sys/time.h>
23
24#include <mach.h>
25#include <mach/message.h>
26
27#include <pt-internal.h>
28
29#ifndef MSG_OPTIONS
30# define MSG_OPTIONS 0
31#endif
32
33/* Block THREAD. */
34error_t
35__pthread_timedblock (struct __pthread *thread,
36 const struct timespec *abstime, clockid_t clock_id)
37{
38 error_t err;
39 mach_msg_header_t msg;
40 mach_msg_timeout_t timeout;
41 struct timespec now;
42
43 /* We have an absolute time and now we have to convert it to a
44 relative time. Arg. */
45
46 err = __clock_gettime (clock_id, &now);
47 assert (!err);
48
49 if (now.tv_sec > abstime->tv_sec
50 || (now.tv_sec == abstime->tv_sec && now.tv_nsec > abstime->tv_nsec))
51 return ETIMEDOUT;
52
53 timeout = (abstime->tv_sec - now.tv_sec) * 1000;
54
55 if (abstime->tv_nsec >= now.tv_nsec)
56 timeout += (abstime->tv_nsec - now.tv_nsec + 999999) / 1000000;
57 else
58 /* Need to do a carry. */
59 timeout -= (now.tv_nsec - abstime->tv_nsec + 999999) / 1000000;
60
61 err = __mach_msg (&msg, MACH_RCV_MSG | MACH_RCV_TIMEOUT | MSG_OPTIONS, 0,
62 sizeof msg, thread->wakeupmsg.msgh_remote_port,
63 timeout, MACH_PORT_NULL);
64 if (err == EMACH_RCV_TIMED_OUT)
65 return ETIMEDOUT;
66 if ((MSG_OPTIONS & MACH_RCV_INTERRUPT) && err == MACH_RCV_INTERRUPTED)
67 return EINTR;
68
69 assert_perror (err);
70 return 0;
71}
72

source code of glibc/sysdeps/mach/htl/pt-timedblock.c