aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/posix
diff options
context:
space:
mode:
authorAdhemerval Zanella <adhemerval.zanella@linaro.org>2019-01-16 16:22:29 +0000
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2019-03-22 15:37:43 -0300
commit38cc11daa43b11b12a7774405accee1007de1adf (patch)
tree33c37e3fa103787e2f29a5658a05f0ec59e71baa /sysdeps/posix
parent421749d693c4147017bc55f5ac3227c3a6e4bf31 (diff)
downloadglibc-38cc11daa43b11b12a7774405accee1007de1adf.zip
glibc-38cc11daa43b11b12a7774405accee1007de1adf.tar.gz
glibc-38cc11daa43b11b12a7774405accee1007de1adf.tar.bz2
nptl: Remove pthread_clock_gettime pthread_clock_settime
This patch removes CLOCK_THREAD_CPUTIME_ID and CLOCK_PROCESS_CPUTIME_ID support from clock_gettime and clock_settime generic implementation. For Linux, kernel already provides supports through the syscall and Hurd HTL lacks __pthread_clock_gettime and __pthread_clock_settime internal implementation. As described in clock_gettime man-page [1] on 'Historical note for SMP system', implementing CLOCK_{THREAD,PROCESS}_CPUTIME_ID with timer registers is error-prone and susceptible to timing and accurary issues that the libc can not deal without kernel support. This allows removes unused code which, however, still incur in some runtime overhead in thread creation (the struct pthread cpuclock_offset initialization). If hurd eventually wants to support them it should either either implement as a kernel facility (or something related due its architecture) or in system specific implementation. Checked on aarch64-linux-gnu, x86_64-linux-gnu, and i686-linux-gnu. I also checked on a i686-gnu build. * nptl/Makefile (libpthread-routines): Remove pthread_clock_gettime and pthread_clock_settime. * nptl/pthreadP.h (__find_thread_by_id): Remove prototype. * elf/dl-support.c [!HP_TIMING_NOAVAIL] (_dl_cpuclock_offset): Remove. (_dl_non_dynamic_init): Remove _dl_cpuclock_offset setting. * elf/rtld.c (_dl_start_final): Likewise. * nptl/allocatestack.c (__find_thread_by_id): Remove function. * sysdeps/generic/ldsodefs.h [!HP_TIMING_NOAVAIL] (_dl_cpuclock_offset): Remove. * sysdeps/mach/hurd/dl-sysdep.c [!HP_TIMING_NOAVAIL] (_dl_cpuclock_offset): Remove. * nptl/descr.h (struct pthread): Rename cpuclock_offset to cpuclock_offset_ununsed. * nptl/nptl-init.c (__pthread_initialize_minimal_internal): Remove cpuclock_offset set. * nptl/pthread_create.c (START_THREAD_DEFN): Likewise. * sysdeps/nptl/fork.c (__libc_fork): Likewise. * nptl/pthread_clock_gettime.c: Remove file. * nptl/pthread_clock_settime.c: Likewise. * sysdeps/unix/clock_gettime.c (hp_timing_gettime): Remove function. [HP_TIMING_AVAIL] (realtime_gettime): Remove CLOCK_THREAD_CPUTIME_ID and CLOCK_PROCESS_CPUTIME_ID support. * sysdeps/unix/clock_settime.c (hp_timing_gettime): Likewise. [HP_TIMING_AVAIL] (realtime_gettime): Likewise. * sysdeps/posix/clock_getres.c (hp_timing_getres): Likewise. [HP_TIMING_AVAIL] (__clock_getres): Likewise. * sysdeps/unix/clock_nanosleep.c (CPUCLOCK_P, INVALID_CLOCK_P): Likewise. (__clock_nanosleep): Remove CPUCLOCK_P and INVALID_CLOCK_P usage. [1] http://man7.org/linux/man-pages/man2/clock_gettime.2.html
Diffstat (limited to 'sysdeps/posix')
-rw-r--r--sysdeps/posix/clock_getres.c46
1 files changed, 1 insertions, 45 deletions
diff --git a/sysdeps/posix/clock_getres.c b/sysdeps/posix/clock_getres.c
index dac4761..01024a3 100644
--- a/sysdeps/posix/clock_getres.c
+++ b/sysdeps/posix/clock_getres.c
@@ -24,37 +24,6 @@
#include <libc-internal.h>
-#if HP_TIMING_AVAIL
-static long int nsec; /* Clock frequency of the processor. */
-
-static int
-hp_timing_getres (struct timespec *res)
-{
- if (__glibc_unlikely (nsec == 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 (__glibc_unlikely (freq == 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)
{
@@ -87,21 +56,8 @@ __clock_getres (clockid_t clock_id, struct timespec *res)
break;
default:
-#if HP_TIMING_AVAIL
- if ((clock_id & ((1 << CLOCK_IDFIELD_SIZE) - 1))
- == CLOCK_THREAD_CPUTIME_ID)
- retval = hp_timing_getres (res);
- else
-#endif
- __set_errno (EINVAL);
- break;
-
-#if HP_TIMING_AVAIL
- case CLOCK_PROCESS_CPUTIME_ID:
- case CLOCK_THREAD_CPUTIME_ID:
- retval = hp_timing_getres (res);
+ __set_errno (EINVAL);
break;
-#endif
}
return retval;