mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 05:20:06 +00:00
71 lines
2.4 KiB
C
71 lines
2.4 KiB
C
|
/* Timed waiting for thread death. Generic futex-using version.
|
||
|
|
Copyright (C) 2003-2015 Free Software Foundation, Inc.
|
||
|
|
This file is part of the GNU C Library.
|
||
|
|
Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
|
||
|
|
|
||
|
|
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
|
||
|
|
<http://www.gnu.org/licenses/>. */
|
||
|
|
|
||
|
|
#include <atomic.h>
|
||
|
|
#include <errno.h>
|
||
|
|
#include <lowlevellock.h>
|
||
|
|
#include <sys/time.h>
|
||
|
|
|
||
|
|
|
||
|
|
/* The kernel notifies a process which uses CLONE_CHILD_CLEARTID via futex
|
||
|
|
wake-up when the clone terminates. The memory location contains the
|
||
|
|
thread ID while the clone is running and is reset to zero by the kernel
|
||
|
|
afterwards. The kernel up to version 3.16.3 does not use the private futex
|
||
|
|
operations for futex wake-up when the clone terminates. */
|
||
|
|
int
|
||
|
|
__lll_timedwait_tid (int *tidp, const struct timespec *abstime)
|
||
|
|
{
|
||
|
|
int tid;
|
||
|
|
|
||
|
|
if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)
|
||
|
|
return EINVAL;
|
||
|
|
|
||
|
|
/* Repeat until thread terminated. */
|
||
|
|
while ((tid = *tidp) != 0)
|
||
|
|
{
|
||
|
|
struct timeval tv;
|
||
|
|
struct timespec rt;
|
||
|
|
|
||
|
|
/* Get the current time. */
|
||
|
|
(void) __gettimeofday (&tv, NULL);
|
||
|
|
|
||
|
|
/* Compute relative timeout. */
|
||
|
|
rt.tv_sec = abstime->tv_sec - tv.tv_sec;
|
||
|
|
rt.tv_nsec = abstime->tv_nsec - tv.tv_usec * 1000;
|
||
|
|
if (rt.tv_nsec < 0)
|
||
|
|
{
|
||
|
|
rt.tv_nsec += 1000000000;
|
||
|
|
--rt.tv_sec;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Already timed out? */
|
||
|
|
if (rt.tv_sec < 0)
|
||
|
|
return ETIMEDOUT;
|
||
|
|
|
||
|
|
/* If *tidp == tid, wait until thread terminates or the wait times out.
|
||
|
|
The kernel up to version 3.16.3 does not use the private futex
|
||
|
|
operations for futex wake-up when the clone terminates.
|
||
|
|
*/
|
||
|
|
if (lll_futex_timed_wait (tidp, tid, &rt, LLL_SHARED) == -ETIMEDOUT)
|
||
|
|
return ETIMEDOUT;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|