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/* Block a thread with a timeout. Mach version.
Copyright (C) 2000-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <assert.h>
#include <errno.h>
#include <time.h>
#include <sys/time.h>
#include <mach.h>
#include <mach/message.h>
#include <pt-internal.h>
/* Block THREAD. */
error_t
__pthread_timedblock (struct __pthread *thread,
const struct timespec *abstime, clockid_t clock_id)
{
error_t err;
mach_msg_header_t msg;
mach_msg_timeout_t timeout;
struct timespec now;
/* We have an absolute time and now we have to convert it to a
relative time. Arg. */
err = clock_gettime (clock_id, &now);
assert (!err);
if (now.tv_sec > abstime->tv_sec
|| (now.tv_sec == abstime->tv_sec && now.tv_nsec > abstime->tv_nsec))
return ETIMEDOUT;
timeout = (abstime->tv_sec - now.tv_sec) * 1000;
if (abstime->tv_nsec >= now.tv_nsec)
timeout += (abstime->tv_nsec - now.tv_nsec + 999999) / 1000000;
else
/* Need to do a carry. */
timeout -= (now.tv_nsec - abstime->tv_nsec + 999999) / 1000000;
err = __mach_msg (&msg, MACH_RCV_MSG | MACH_RCV_TIMEOUT, 0,
sizeof msg, thread->wakeupmsg.msgh_remote_port,
timeout, MACH_PORT_NULL);
if (err == EMACH_RCV_TIMED_OUT)
return ETIMEDOUT;
assert_perror (err);
return 0;
}
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