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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [clock_settime.c] - Rev 301
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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 <time.h> #include <sys/time.h> #include <libc-internal.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 void __pthread_clock_settime (hp_timing_t offset) __attribute__ ((__weak__)); #endif /* Set CLOCK to value TP. */ int clock_settime (clockid_t clock_id, const struct timespec *tp) { struct timeval tv; int retval; /* Make sure the time cvalue is OK. */ if (tp->tv_nsec < 0 || tp->tv_nsec >= 1000000000) { __set_errno (EINVAL); return -1; } switch (clock_id) { case CLOCK_REALTIME: TIMESPEC_TO_TIMEVAL (&tv, tp); retval = settimeofday (&tv, NULL); break; #if HP_TIMING_AVAIL case CLOCK_PROCESS_CPUTIME_ID: case CLOCK_THREAD_CPUTIME_ID: { hp_timing_t tsc; hp_timing_t usertime; /* First thing is to get the current time. */ HP_TIMING_NOW (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. */ retval = -1; break; } } /* Convert the user-provided time into CPU ticks. */ usertime = tp->tv_sec * freq + (tp->tv_nsec * freq) / 1000000000ull; /* Determine the offset and use it as the new base value. */ if (clock_id != CLOCK_THREAD_CPUTIME_ID || __pthread_clock_settime == NULL) _dl_cpuclock_offset = tsc - usertime; else __pthread_clock_settime (tsc - usertime); retval = 0; } break; #endif default: __set_errno (EINVAL); retval = -1; break; } return retval; }
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