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glibc/nptl/lll_timedwait_tid.c
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/* Timed waiting for thread death. Generic futex-using version. | |
Copyright (C) 2003-2016 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; | |
} |