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Add fork hooks for pthread_atfork

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pthread_atfork needs application callbacks to be called outside any locking.
This commit is contained in:
Samuel Thibault 2013-09-24 23:08:15 +02:00
parent d39baad11e
commit 7b7bab1391
2 changed files with 22 additions and 0 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2013-10-04 Samuel Thibault <samuel.thibault@ens-lyon.org>
* sysdeps/mach/hurd/fork.c (_hurd_atfork_prepare_hook,
_hurd_atfork_child_hook, _hurd_atfork_parent_hook): New hooks.
(__fork): Call _hurd_atfork_prepare_hook hooks before all locking, call
_hurd_atfork_parent_hook or _hurd_atfork_child_hook after all unlocking.
2013-10-04 Ryan S. Arnold <ryan.arnold@linaro.org> 2013-10-04 Ryan S. Arnold <ryan.arnold@linaro.org>
* misc/swapon.c (swapon): Update definition, adding FLAGS parameter to * misc/swapon.c (swapon): Update definition, adding FLAGS parameter to

15
sysdeps/mach/hurd/fork.c
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@ -34,6 +34,11 @@
symbol_set_declare (_hurd_fork_locks) symbol_set_declare (_hurd_fork_locks)
/* Application callbacks registered through pthread_atfork. */
DEFINE_HOOK (_hurd_atfork_prepare_hook, (void));
DEFINE_HOOK (_hurd_atfork_child_hook, (void));
DEFINE_HOOK (_hurd_atfork_parent_hook, (void));
/* Things that want to be called before we fork, to prepare the parent for /* Things that want to be called before we fork, to prepare the parent for
task_create, when the new child task will inherit our address space. */ task_create, when the new child task will inherit our address space. */
DEFINE_HOOK (_hurd_fork_prepare_hook, (void)); DEFINE_HOOK (_hurd_fork_prepare_hook, (void));
@ -62,6 +67,8 @@ __fork (void)
error_t err; error_t err;
struct hurd_sigstate *volatile ss; struct hurd_sigstate *volatile ss;
RUN_HOOK (_hurd_atfork_prepare_hook, ());
ss = _hurd_self_sigstate (); ss = _hurd_self_sigstate ();
__spin_lock (&ss->critical_section_lock); __spin_lock (&ss->critical_section_lock);
@ -695,6 +702,14 @@ __fork (void)
_hurd_critical_section_unlock (ss); _hurd_critical_section_unlock (ss);
if (!err)
{
if (pid != 0)
RUN_HOOK (_hurd_atfork_parent_hook, ());
else
RUN_HOOK (_hurd_atfork_child_hook, ());
}
return err ? __hurd_fail (err) : pid; return err ? __hurd_fail (err) : pid;
} }
libc_hidden_def (__fork) libc_hidden_def (__fork)