diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/clock_gettime.c')
| -rw-r--r-- | REORG.TODO/sysdeps/unix/clock_gettime.c | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/clock_gettime.c b/REORG.TODO/sysdeps/unix/clock_gettime.c new file mode 100644 index 0000000000..5262066f51 --- /dev/null +++ b/REORG.TODO/sysdeps/unix/clock_gettime.c @@ -0,0 +1,136 @@ +/* clock_gettime -- Get the current time from a POSIX clockid_t. Unix version. + Copyright (C) 1999-2017 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, see + <http://www.gnu.org/licenses/>. */ + +#include <errno.h> +#include <stdint.h> +#include <time.h> +#include <sys/time.h> +#include <libc-internal.h> +#include <ldsodefs.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; + + +/* This function is defined in the thread library. */ +extern int __pthread_clock_gettime (clockid_t clock_id, hp_timing_t freq, + struct timespec *tp) + __attribute__ ((__weak__)); + +static int +hp_timing_gettime (clockid_t clock_id, struct timespec *tp) +{ + hp_timing_t tsc; + + if (__glibc_unlikely (freq == 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 (__glibc_unlikely (freq == 0)) + /* Something went wrong. */ + return -1; + } + + if (clock_id != CLOCK_PROCESS_CPUTIME_ID + && __pthread_clock_gettime != NULL) + return __pthread_clock_gettime (clock_id, freq, tp); + + /* Get the current counter. */ + HP_TIMING_NOW (tsc); + + /* Compute the offset since the start time of the process. */ + tsc -= GL(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; + + return 0; +} +#endif + + +static inline int +realtime_gettime (struct timespec *tp) +{ + struct timeval tv; + int retval = gettimeofday (&tv, NULL); + if (retval == 0) + /* Convert into `timespec'. */ + TIMEVAL_TO_TIMESPEC (&tv, tp); + return retval; +} + + +/* Get current value of CLOCK and store it in TP. */ +int +__clock_gettime (clockid_t clock_id, struct timespec *tp) +{ + int retval = -1; + + switch (clock_id) + { +#ifdef SYSDEP_GETTIME + SYSDEP_GETTIME; +#endif + +#ifndef HANDLED_REALTIME + case CLOCK_REALTIME: + { + struct timeval tv; + retval = gettimeofday (&tv, NULL); + if (retval == 0) + TIMEVAL_TO_TIMESPEC (&tv, tp); + } + break; +#endif + + default: +#ifdef SYSDEP_GETTIME_CPU + SYSDEP_GETTIME_CPU (clock_id, tp); +#endif +#if HP_TIMING_AVAIL + if ((clock_id & ((1 << CLOCK_IDFIELD_SIZE) - 1)) + == CLOCK_THREAD_CPUTIME_ID) + retval = hp_timing_gettime (clock_id, tp); + else +#endif + __set_errno (EINVAL); + break; + +#if HP_TIMING_AVAIL && !defined HANDLED_CPUTIME + case CLOCK_PROCESS_CPUTIME_ID: + retval = hp_timing_gettime (clock_id, tp); + break; +#endif + } + + return retval; +} +weak_alias (__clock_gettime, clock_gettime) +libc_hidden_def (__clock_gettime) |