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glibc/nptl/pthread_clock_settime.c
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/* Copyright (C) 2001-2016 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; see the file COPYING.LIB. If | |
not, see <http://www.gnu.org/licenses/>. */ | |
#include <errno.h> | |
#include <stdlib.h> | |
#include <time.h> | |
#include <libc-internal.h> | |
#include "pthreadP.h" | |
#if HP_TIMING_AVAIL | |
int | |
__pthread_clock_settime (clockid_t clock_id, hp_timing_t offset) | |
{ | |
/* This is the ID of the thread we are looking for. */ | |
pid_t tid = ((unsigned int) clock_id) >> CLOCK_IDFIELD_SIZE; | |
/* Compute the offset since the start time of the process. */ | |
if (tid == 0 || tid == THREAD_GETMEM (THREAD_SELF, tid)) | |
/* Our own clock. */ | |
THREAD_SETMEM (THREAD_SELF, cpuclock_offset, offset); | |
else | |
{ | |
/* This is more complicated. We have to locate the thread based | |
on the ID. This means walking the list of existing | |
threads. */ | |
struct pthread *thread = __find_thread_by_id (tid); | |
if (thread == NULL) | |
{ | |
__set_errno (EINVAL); | |
return -1; | |
} | |
/* There is a race here. The thread might terminate and the stack | |
become unusable. But this is the user's problem. */ | |
thread->cpuclock_offset = offset; | |
} | |
return 0; | |
} | |
#endif |