| /* Copyright (C) 2001, 2002, 2003 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, |
| write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include <errno.h> |
| #include <stdlib.h> |
| #include <time.h> |
| #include <libc-internal.h> |
| #include "pthreadP.h" |
| |
| |
| #if HP_TIMING_AVAIL |
| int |
| __pthread_clock_gettime (clockid_t clock_id, hp_timing_t freq, |
| struct timespec *tp) |
| { |
| hp_timing_t tsc; |
| |
| /* Get the current counter. */ |
| HP_TIMING_NOW (tsc); |
| |
| /* 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. */ |
| tsc -= THREAD_GETMEM (THREAD_SELF, cpuclock_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. */ |
| tsc -= thread->cpuclock_offset; |
| } |
| |
| /* Compute the seconds. */ |
| tp->tv_sec = tsc / freq; |
| |
| /* And the nanoseconds. This computation should be stable until |
| we get machines with about 16GHz frequency. */ |
| tp->tv_nsec = ((tsc % freq) * 1000000000ull) / freq; |
| |
| return 0; |
| } |
| #endif |