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glibc/nptl/pthread_getcpuclockid.c
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/* Copyright (C) 2000-2016 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 <pthreadP.h> | |
#include <sys/time.h> | |
#include <tls.h> | |
int | |
pthread_getcpuclockid (pthread_t threadid, clockid_t *clockid) | |
{ | |
struct pthread *pd = (struct pthread *) threadid; | |
/* Make sure the descriptor is valid. */ | |
if (INVALID_TD_P (pd)) | |
/* Not a valid thread handle. */ | |
return ESRCH; | |
#ifdef CLOCK_THREAD_CPUTIME_ID | |
/* We need to store the thread ID in the CLOCKID variable together | |
with a number identifying the clock. We reserve the low 3 bits | |
for the clock ID and the rest for the thread ID. This is | |
problematic if the thread ID is too large. But 29 bits should be | |
fine. | |
If some day more clock IDs are needed the ID part can be | |
enlarged. The IDs are entirely internal. */ | |
if (pd->tid >= 1 << (8 * sizeof (*clockid) - CLOCK_IDFIELD_SIZE)) | |
return ERANGE; | |
/* Store the number. */ | |
*clockid = CLOCK_THREAD_CPUTIME_ID | (pd->tid << CLOCK_IDFIELD_SIZE); | |
return 0; | |
#else | |
/* We don't have a timer for that. */ | |
return ENOENT; | |
#endif | |
} |