diff options
Diffstat (limited to 'sysdeps/posix/clock_getres.c')
| -rw-r--r-- | sysdeps/posix/clock_getres.c | 111 |
1 files changed, 51 insertions, 60 deletions
diff --git a/sysdeps/posix/clock_getres.c b/sysdeps/posix/clock_getres.c index f4dc21f8af..a2d466607e 100644 --- a/sysdeps/posix/clock_getres.c +++ b/sysdeps/posix/clock_getres.c @@ -1,5 +1,4 @@ -/* clock_getres -- Get the resolution of a POSIX clockid_t. - Copyright (C) 1999, 2000, 2001, 2003, 2004 Free Software Foundation, Inc. +/* Copyright (C) 1999, 2000, 2001, 2003 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 @@ -25,55 +24,11 @@ #include <libc-internal.h> -#if HP_TIMING_AVAIL -static long int nsec; /* Clock frequency of the processor. */ - -static inline int -hp_timing_getres (struct timespec *res) -{ - if (__builtin_expect (nsec == 0, 0)) - { - hp_timing_t freq; - - /* This can only happen if we haven't initialized the `nsec' - 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. */ - return -1; - - nsec = MAX (UINT64_C (1000000000) / freq, 1); - } - - /* Fill in the values. - The seconds are always zero (unless we have a 1Hz machine). */ - res->tv_sec = 0; - res->tv_nsec = nsec; - - return 0; -} +#if HP_TIMING_AVAIL && !defined HANDLED_CPUTIME +/* Clock frequency of the processor. */ +static long int nsec; #endif -static inline int -realtime_getres (struct timespec *res) -{ - long int clk_tck = sysconf (_SC_CLK_TCK); - - if (__builtin_expect (clk_tck != -1, 1)) - { - /* This implementation assumes that the realtime clock has a - resolution higher than 1 second. This is the case for any - reasonable implementation. */ - res->tv_sec = 0; - res->tv_nsec = 1000000000 / clk_tck; - return 0; - } - - return -1; -} - /* Get resolution of clock. */ int @@ -83,33 +38,69 @@ clock_getres (clockid_t clock_id, struct timespec *res) switch (clock_id) { +#define HANDLE_REALTIME \ + do { \ + long int clk_tck = sysconf (_SC_CLK_TCK); \ + \ + if (__builtin_expect (clk_tck != -1, 1)) \ + { \ + /* This implementation assumes that the realtime clock has a \ + resolution higher than 1 second. This is the case for any \ + reasonable implementation. */ \ + res->tv_sec = 0; \ + res->tv_nsec = 1000000000 / clk_tck; \ + \ + retval = 0; \ + } \ + } while (0) + #ifdef SYSDEP_GETRES SYSDEP_GETRES; #endif #ifndef HANDLED_REALTIME case CLOCK_REALTIME: - retval = realtime_getres (res); + HANDLE_REALTIME; break; #endif /* handled REALTIME */ default: -#ifdef SYSDEP_GETRES_CPU - SYSDEP_GETRES_CPU; -#endif #if HP_TIMING_AVAIL if ((clock_id & ((1 << CLOCK_IDFIELD_SIZE) - 1)) - == CLOCK_THREAD_CPUTIME_ID) - retval = hp_timing_getres (res); - else + != CLOCK_THREAD_CPUTIME_ID) #endif - __set_errno (EINVAL); - break; + { + __set_errno (EINVAL); + break; + } #if HP_TIMING_AVAIL && !defined HANDLED_CPUTIME + /* FALLTHROUGH. */ case CLOCK_PROCESS_CPUTIME_ID: - case CLOCK_THREAD_CPUTIME_ID: - retval = hp_timing_getres (res); + { + 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 } |