diff options
Diffstat (limited to 'sysdeps/unix/clock_settime.c')
| -rw-r--r-- | sysdeps/unix/clock_settime.c | 58 |
1 files changed, 55 insertions, 3 deletions
diff --git a/sysdeps/unix/clock_settime.c b/sysdeps/unix/clock_settime.c index 9155d4607d..69d6802b38 100644 --- a/sysdeps/unix/clock_settime.c +++ b/sysdeps/unix/clock_settime.c @@ -19,12 +19,26 @@ #include <errno.h> #include <time.h> #include <sys/time.h> +#include <libc-internal.h> -#ifndef EXTRA_CLOCK_CASES -# define EXTRA_CLOCK_CASES +#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) @@ -47,7 +61,45 @@ clock_settime (clockid_t clock_id, const struct timespec *tp) retval = settimeofday (&tv, NULL); break; - EXTRA_CLOCK_CASES +#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); |