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Linux: set_robust_list syscall number is always available

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Due to the built-in tables, __NR_set_robust_list is always defined
(although it may not be available at run time).

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer 2020-02-09 16:38:33 +01:00
parent 75376039be
commit b03604b1b8
3 changed files with 6 additions and 14 deletions
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4
nptl/nptl-init.c
View File

@ -117,10 +117,8 @@ static
void
__nptl_set_robust (struct pthread *self)
{
#ifdef __NR_set_robust_list
INTERNAL_SYSCALL_CALL (set_robust_list, &self->robust_head,
sizeof (struct robust_list_head));
#endif
}
@ -240,14 +238,12 @@ __pthread_initialize_minimal_internal (void)
pd->robust_prev = &pd->robust_head;
#endif
pd->robust_head.list = &pd->robust_head;
#ifdef __NR_set_robust_list
pd->robust_head.futex_offset = (offsetof (pthread_mutex_t, __data.__lock)
- offsetof (pthread_mutex_t,
__data.__list.__next));
int res = INTERNAL_SYSCALL_CALL (set_robust_list, &pd->robust_head,
sizeof (struct robust_list_head));
if (INTERNAL_SYSCALL_ERROR_P (res))
#endif
set_robust_list_not_avail ();
}

6
nptl/pthread_create.c
View File

@ -389,17 +389,15 @@ START_THREAD_DEFN
if (__glibc_unlikely (atomic_exchange_acq (&pd->setxid_futex, 0) == -2))
futex_wake (&pd->setxid_futex, 1, FUTEX_PRIVATE);
#ifdef __NR_set_robust_list
# ifndef __ASSUME_SET_ROBUST_LIST
#ifndef __ASSUME_SET_ROBUST_LIST
if (__set_robust_list_avail >= 0)
# endif
#endif
{
/* This call should never fail because the initial call in init.c
succeeded. */
INTERNAL_SYSCALL_CALL (set_robust_list, &pd->robust_head,
sizeof (struct robust_list_head));
}
#endif
/* If the parent was running cancellation handlers while creating
the thread the new thread inherited the signal mask. Reset the

10
sysdeps/nptl/fork.c
View File

@ -83,7 +83,6 @@ __libc_fork (void)
if (__fork_generation_pointer != NULL)
*__fork_generation_pointer += __PTHREAD_ONCE_FORK_GEN_INCR;
#ifdef __NR_set_robust_list
/* Initialize the robust mutex list setting in the kernel which has
been reset during the fork. We do not check for errors because if
it fails here, it must have failed at process startup as well and
@ -94,19 +93,18 @@ __libc_fork (void)
inherit the correct value from the parent. We do not need to clear
the pending operation because it must have been zero when fork was
called. */
# if __PTHREAD_MUTEX_HAVE_PREV
#if __PTHREAD_MUTEX_HAVE_PREV
self->robust_prev = &self->robust_head;
# endif
#endif
self->robust_head.list = &self->robust_head;
# ifdef SHARED
#ifdef SHARED
if (__builtin_expect (__libc_pthread_functions_init, 0))
PTHFCT_CALL (ptr_set_robust, (self));
# else
#else
extern __typeof (__nptl_set_robust) __nptl_set_robust
__attribute__((weak));
if (__builtin_expect (__nptl_set_robust != NULL, 0))
__nptl_set_robust (self);
# endif
#endif
/* Reset the lock state in the multi-threaded case. */