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authorJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
committerJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
commit0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (patch)
tree2ea1f8305970753e4a657acb2ccc15ca3eec8e2c /sysdeps/unix/clock_gettime.c
parent7d58530341304d403a6626d7f7a1913165fe2f32 (diff)
downloadglibc-0ecb606cb6cf65de1d9fc8a919bceb4be476c602.tar.gz
2.5-18.1
Diffstat (limited to 'sysdeps/unix/clock_gettime.c')
-rw-r--r--sysdeps/unix/clock_gettime.c123
1 files changed, 67 insertions, 56 deletions
diff --git a/sysdeps/unix/clock_gettime.c b/sysdeps/unix/clock_gettime.c
index 7a3db29744..f698f0151b 100644
--- a/sysdeps/unix/clock_gettime.c
+++ b/sysdeps/unix/clock_gettime.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
+/* clock_gettime -- Get the current time from a POSIX clockid_t. Unix version.
+ Copyright (C) 1999-2004, 2005 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
@@ -35,89 +36,99 @@ static hp_timing_t freq;
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 (__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. */
+ 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;
+ struct timeval tv;
switch (clock_id)
{
-#define HANDLE_REALTIME \
- do { \
- struct timeval tv; \
- retval = gettimeofday (&tv, NULL); \
- if (retval == 0) \
- /* Convert into `timespec'. */ \
- TIMEVAL_TO_TIMESPEC (&tv, tp); \
- } while (0)
-
#ifdef SYSDEP_GETTIME
SYSDEP_GETTIME;
#endif
#ifndef HANDLED_REALTIME
case CLOCK_REALTIME:
- HANDLE_REALTIME;
+ retval = gettimeofday (&tv, NULL);
+ if (retval == 0)
+ TIMEVAL_TO_TIMESPEC (&tv, tp);
break;
#endif
default:
+#ifdef SYSDEP_GETTIME_CPU
+ SYSDEP_GETTIME_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_gettime (clock_id, tp);
+ else
#endif
- {
- __set_errno (EINVAL);
- break;
- }
+ __set_errno (EINVAL);
+ break;
-#if HP_TIMING_AVAIL
- /* FALLTHROUGH. */
+#if HP_TIMING_AVAIL && !defined HANDLED_CPUTIME
case CLOCK_PROCESS_CPUTIME_ID:
- {
- hp_timing_t 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. */
- break;
- }
-
- if (clock_id != CLOCK_PROCESS_CPUTIME_ID
- && __pthread_clock_gettime != NULL)
- {
- retval = __pthread_clock_gettime (clock_id, freq, tp);
- break;
- }
-
- /* 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;
-
- retval = 0;
- }
- break;
+ retval = hp_timing_gettime (clock_id, tp);
+ break;
#endif
}
return retval;
}
+librt_hidden_def (clock_gettime)