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NPTL: Conditionalize direct futex syscall uses.

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This commit is contained in:
Roland McGrath
2014-10-17 14:30:16 -07:00
parent 327ae25707
commit 184ee94010
7 changed files with 62 additions and 22 deletions
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8
nptl/nptl-init.c
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@ -329,7 +329,8 @@ __pthread_initialize_minimal_internal (void)
#endif
set_robust_list_not_avail ();
#ifndef __ASSUME_PRIVATE_FUTEX
#ifdef __NR_futex
# ifndef __ASSUME_PRIVATE_FUTEX
/* Private futexes are always used (at least internally) so that
doing the test once this early is beneficial. */
{
@ -345,8 +346,8 @@ __pthread_initialize_minimal_internal (void)
know the former are not supported. This also means we know the
kernel will return ENOSYS for unknown operations. */
if (THREAD_GETMEM (pd, header.private_futex) != 0)
#endif
#ifndef __ASSUME_FUTEX_CLOCK_REALTIME
# endif
# ifndef __ASSUME_FUTEX_CLOCK_REALTIME
{
int word = 0;
/* NB: the syscall actually takes six parameters. The last is the
@ -361,6 +362,7 @@ __pthread_initialize_minimal_internal (void)
if (INTERNAL_SYSCALL_ERRNO (word, err) != ENOSYS)
__set_futex_clock_realtime ();
}
# endif
#endif
/* Set initial thread's stack block from 0 up to __libc_stack_end.