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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [clock_gettime.c] - Rev 298
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/* Copyright (C) 1999, 2000, 2001 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; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <errno.h> #include <stdint.h> #include <time.h> #include <sys/time.h> #include <libc-internal.h> #include <hp-timing.h> #if HP_TIMING_AVAIL /* Clock frequency of the processor. We make it a 64-bit variable because some jokers are already playing with processors with more than 4GHz. */ static hp_timing_t freq; /* We need the starting time for the process. */ extern hp_timing_t _dl_cpuclock_offset; /* This function is defined in the thread library. */ extern int __pthread_clock_gettime (hp_timing_t freq, struct timespec *tp) __attribute__ ((__weak__)); #endif /* Get current value of CLOCK and store it in TP. */ int clock_gettime (clockid_t clock_id, struct timespec *tp) { struct timeval tv; int retval = -1; switch (clock_id) { case CLOCK_REALTIME: retval = gettimeofday (&tv, NULL); if (retval == 0) /* Convert into `timespec'. */ TIMEVAL_TO_TIMESPEC (&tv, tp); break; #if HP_TIMING_AVAIL case CLOCK_PROCESS_CPUTIME_ID: case CLOCK_THREAD_CPUTIME_ID: { hp_timing_t tsc; if (__builtin_expect (freq == 0, 0)) { /* This can only happen if we haven't initialized the `freq' variable yet. Do this now. We don't have to protect this code against multiple execution since all of them should lead to the same result. */ freq = __get_clockfreq (); if (__builtin_expect (freq == 0, 0)) /* Something went wrong. */ break; } if (clock_id == CLOCK_THREAD_CPUTIME_ID && __pthread_clock_gettime != NULL) { retval = __pthread_clock_gettime (freq, tp); break; } /* Get the current counter. */ HP_TIMING_NOW (tsc); /* Compute the offset since the start time of the process. */ tsc -= _dl_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) * UINT64_C (1000000000)) / freq; retval = 0; } break; #endif default: __set_errno (EINVAL); break; } return retval; }
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