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/* Copyright (C) 2001, 2004 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 <time.h> #include "internals.h" #include "spinlock.h" #if HP_TIMING_AVAIL int __pthread_clock_gettime (clockid_t clock_id, hp_timing_t freq, struct timespec *tp) { hp_timing_t tsc, cpuclock_offset; pthread_descr self = thread_self (); pthread_t thread = ((unsigned int) clock_id) >> CLOCK_IDFIELD_SIZE; const unsigned int mask = ~0U >> CLOCK_IDFIELD_SIZE; if (thread == 0 || (THREAD_GETMEM (self, p_tid) & mask) == thread) cpuclock_offset = THREAD_GETMEM (self, p_cpuclock_offset); else { pthread_descr th; pthread_handle handle = thread_handle (thread); __pthread_lock (&handle->h_lock, NULL); th = handle->h_descr; if (th == NULL || (th->p_tid & mask) != thread || th->p_terminated) { __pthread_unlock (&handle->h_lock); __set_errno (EINVAL); return -1; } cpuclock_offset = th->p_cpuclock_offset; __pthread_unlock (&handle->h_lock); } /* Get the current counter. */ HP_TIMING_NOW (tsc); /* Compute the offset since the start time of the process. */ tsc -= 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 |