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author | Roland McGrath <roland@gnu.org> | 2005-04-27 08:01:41 +0000 |
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committer | Roland McGrath <roland@gnu.org> | 2005-04-27 08:01:41 +0000 |
commit | 2f4f3bd4a9ad805383b278e5b975971ca15c7a77 (patch) | |
tree | 86e86b058694d53779f2c2038b42b334bfce401d /sysdeps/posix/clock_getres.c | |
parent | 0f888d8ec6e038895be5d0a562d90be5e930a88a (diff) | |
download | glibc-2f4f3bd4a9ad805383b278e5b975971ca15c7a77.tar.gz glibc-2f4f3bd4a9ad805383b278e5b975971ca15c7a77.tar.xz glibc-2f4f3bd4a9ad805383b278e5b975971ca15c7a77.zip |
2005-04-27 Roland McGrath <roland@redhat.com>
* sysdeps/unix/sysv/linux/kernel-posix-cpu-timers.h: New file. * sysdeps/unix/sysv/linux/clock_getcpuclockid.c: New file. * sysdeps/unix/sysv/linux/ia64/clock_getcpuclockid.c (HAS_CPUCLOCK): New macro. (clock_getcpuclockid): Function removed. #include the new linux file to define it instead. * sysdeps/unix/clock_gettime.c [HP_TIMING_AVAIL] (hp_timing_gettime): New function, broken out of ... (clock_gettime) [HP_TIMING_AVAIL]: ... here. Call it. (realtime_gettime): New function, broken out of ... (clock_gettime) [! HANDLED_REALTIME]: ... here. Call it. (clock_gettime) [SYSDEP_GETTIME_CPU]: Use new macro in default case. * sysdeps/unix/sysv/linux/clock_gettime.c (SYSCALL_GETTIME): New macro. (SYSDEP_GETTIME_CPUTIME): New macro. (SYSDEP_GETTIME): Use both. [! __ASSUME_POSIX_TIMERS] (maybe_syscall_gettime): New function, broken out of ... (SYSDEP_GETTIME): ... here. Use it. [__NR_clock_gettime] (HANDLED_CPUTIME): Define it. (SYSDEP_GETTIME_CPUTIME): New macro. Handle CPU timers by trying kernel support and falling back to hp-timing code. * sysdeps/posix/clock_getres.c [HP_TIMING_AVAIL] (hp_timing_getres): New function, broken out of ... (clock_getres) [HP_TIMING_AVAIL]: ... here. Call it. (realtime_getres): New function, broken out of ... (clock_getres) [! HANDLED_REALTIME]: ... here. Call it. (clock_getres) [SYSDEP_GETRES_CPU]: Use new macro in default case. * sysdeps/unix/sysv/linux/clock_getres.c (SYSCALL_GETRES): New macro. (SYSDEP_GETRES_CPUTIME): New macro. (SYSDEP_GETRES): Use both. [! __ASSUME_POSIX_TIMERS] (maybe_syscall_getres): New function, broken out of ... (SYSDEP_GETRES): ... here. Use it. [__NR_clock_getres] (HANDLED_CPUTIME): Define it. (SYSDEP_GETRES_CPUTIME): New macro. Handle CPU timers by trying kernel support and falling back to hp-timing code. * sysdeps/unix/sysv/linux/clock_nanosleep.c: Handle CLOCK_PROCESS_CPUTIME_ID and CLOCK_PROCESS_THREAD_ID specially, translating to the kernel clockid_t for our own process/thread clock.
Diffstat (limited to 'sysdeps/posix/clock_getres.c')
-rw-r--r-- | sysdeps/posix/clock_getres.c | 111 |
1 files changed, 60 insertions, 51 deletions
diff --git a/sysdeps/posix/clock_getres.c b/sysdeps/posix/clock_getres.c index a2d466607e..f4dc21f8af 100644 --- a/sysdeps/posix/clock_getres.c +++ b/sysdeps/posix/clock_getres.c @@ -1,4 +1,5 @@ -/* Copyright (C) 1999, 2000, 2001, 2003 Free Software Foundation, Inc. +/* clock_getres -- Get the resolution of a POSIX clockid_t. + Copyright (C) 1999, 2000, 2001, 2003, 2004 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 @@ -24,11 +25,55 @@ #include <libc-internal.h> -#if HP_TIMING_AVAIL && !defined HANDLED_CPUTIME -/* Clock frequency of the processor. */ -static long int nsec; +#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; +} #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 @@ -38,69 +83,33 @@ 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: - HANDLE_REALTIME; + retval = realtime_getres (res); 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) + == CLOCK_THREAD_CPUTIME_ID) + retval = hp_timing_getres (res); + else #endif - { - __set_errno (EINVAL); - break; - } + __set_errno (EINVAL); + break; #if HP_TIMING_AVAIL && !defined HANDLED_CPUTIME - /* FALLTHROUGH. */ case CLOCK_PROCESS_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; - } + case CLOCK_THREAD_CPUTIME_ID: + retval = hp_timing_getres (res); break; #endif } |