diff options
Diffstat (limited to 'sysdeps/posix/clock_getres.c')
| -rw-r--r-- | sysdeps/posix/clock_getres.c | 39 |
1 files changed, 36 insertions, 3 deletions
diff --git a/sysdeps/posix/clock_getres.c b/sysdeps/posix/clock_getres.c index 0d8e29b5a8..cf92a35abf 100644 --- a/sysdeps/posix/clock_getres.c +++ b/sysdeps/posix/clock_getres.c @@ -17,14 +17,19 @@ Boston, MA 02111-1307, USA. */ #include <errno.h> +#include <stdint.h> #include <time.h> #include <unistd.h> +#include <sys/param.h> +#include <libc-internal.h> -#ifndef EXTRA_CLOCK_CASES -# define EXTRA_CLOCK_CASES +#if HP_TIMING_AVAIL +/* Clock frequency of the processor. */ +static long int nsec; #endif + /* Get resolution of clock. */ int clock_getres (clockid_t clock_id, struct timespec *res) @@ -50,7 +55,35 @@ clock_getres (clockid_t clock_id, struct timespec *res) } break; - EXTRA_CLOCK_CASES +#if HP_TIMING_AVAIL + case CLOCK_PROCESS_CPUTIME_ID: + case CLOCK_THREAD_CPUTIME_ID: + { + if (__builtin_expect (nsec == 0, 0)) + { + hp_timing_t freq; + + /* 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; + + nsec = MAX (UINT64_C (1000000000) / freq, 1); + } + + /* File in the values. The seconds are always zero (unless we + have a 1Hz machine). */ + res->tv_sec = 0; + res->tv_nsec = nsec; + + retval = 0; + } + break; +#endif default: __set_errno (EINVAL); |