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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/mach/hurd/dl-sysdep.c
parent421749d693c4147017bc55f5ac3227c3a6e4bf31 (diff)
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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/mach/hurd/dl-sysdep.c')
-rw-r--r--sysdeps/mach/hurd/dl-sysdep.c8
1 files changed, 0 insertions, 8 deletions
diff --git a/sysdeps/mach/hurd/dl-sysdep.c b/sysdeps/mach/hurd/dl-sysdep.c
index 07d64d8122..5cb347f5d1 100644
--- a/sysdeps/mach/hurd/dl-sysdep.c
+++ b/sysdeps/mach/hurd/dl-sysdep.c
@@ -62,10 +62,6 @@ int __libc_multiple_libcs = 0;	/* Defining this here avoids the inclusion
 void *__libc_stack_end = NULL;
 rtld_hidden_data_def(__libc_stack_end)
 
-#if HP_TIMING_AVAIL
-hp_timing_t _dl_cpuclock_offset;
-#endif
-
 /* TODO: Initialize.  */
 void *_dl_random attribute_relro = NULL;
 
@@ -246,10 +242,6 @@ unfmh();			/* XXX */
   /* Initialize frequently used global variable.  */
   GLRO(dl_pagesize) = __getpagesize ();
 
-#if HP_TIMING_AVAIL
-  HP_TIMING_NOW (_dl_cpuclock_offset);
-#endif
-
 fmh();				/* XXX */
 
   /* See hurd/hurdstartup.c; this deals with getting information