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hurdmalloc: Run fork handler as late as possible [BZ #19431]

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This is the hurd-specific follow-up for
29d794863c : hurdmalloc also needs the
same fix

	* hurd/hurdmalloc.c (malloc_fork_prepare): Rename to
	_hurd_malloc_fork_prepare.
	(malloc_fork_parent): Rename to _hurd_malloc_fork_parent.
	(malloc_fork_child): Rename to _hurd_malloc_fork_child.
	(_hurd_fork_prepare_hook): Drop malloc_fork_prepare.
	(_hurd_fork_parent_hook): Drop malloc_fork_parent.
	(_hurd_fork_child_hook): Drop malloc_fork_child.
	* hurd/hurdmalloc.h (_hurd_malloc_fork_prepare,
	_hurd_malloc_fork_parent, _hurd_malloc_fork_child): Add declarations.
	* sysdeps/mach/hurd/fork.c (__fork): Call __malloc_fork_lock_parent
	after locking locks (notably hurd_dtable_lock). Call
	_hurd_malloc_fork_prepare after that. Call _hurd_malloc_fork_parent
	before __malloc_fork_unlock_parent and _hurd_malloc_fork_child before
	__malloc_fork_unlock_child.
This commit is contained in:
Samuel Thibault 2016-09-22 01:45:48 +02:00
parent 87ab10d652
commit e67f54ab1a
4 changed files with 36 additions and 15 deletions
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17
ChangeLog
View File

@ -1,3 +1,20 @@
2016-09-22 Samuel Thibault <samuel.thibault@ens-lyon.org>
* hurd/hurdmalloc.c (malloc_fork_prepare): Rename to
_hurd_malloc_fork_prepare.
(malloc_fork_parent): Rename to _hurd_malloc_fork_parent.
(malloc_fork_child): Rename to _hurd_malloc_fork_child.
(_hurd_fork_prepare_hook): Drop malloc_fork_prepare.
(_hurd_fork_parent_hook): Drop malloc_fork_parent.
(_hurd_fork_child_hook): Drop malloc_fork_child.
* hurd/hurdmalloc.h (_hurd_malloc_fork_prepare,
_hurd_malloc_fork_parent, _hurd_malloc_fork_child): Add declarations.
* sysdeps/mach/hurd/fork.c (__fork): Call __malloc_fork_lock_parent
after locking locks (notably hurd_dtable_lock). Call
_hurd_malloc_fork_prepare after that. Call _hurd_malloc_fork_parent
before __malloc_fork_unlock_parent and _hurd_malloc_fork_child before
__malloc_fork_unlock_child.
2016-09-21 James Greenhalgh <james.greenhalgh@arm.com>
* soft-fp/extendhftf2.c: New.

15
hurd/hurdmalloc.c
View File

@ -405,8 +405,8 @@ print_malloc_free_list (void)
}
#endif /* DEBUG */
static void
malloc_fork_prepare(void)
void
_hurd_malloc_fork_prepare(void)
/*
* Prepare the malloc module for a fork by insuring that no thread is in a
* malloc critical section.
@ -419,8 +419,8 @@ malloc_fork_prepare(void)
}
}
static void
malloc_fork_parent(void)
void
_hurd_malloc_fork_parent(void)
/*
* Called in the parent process after a fork() to resume normal operation.
*/
@ -432,8 +432,8 @@ malloc_fork_parent(void)
}
}
static void
malloc_fork_child(void)
void
_hurd_malloc_fork_child(void)
/*
* Called in the child process after a fork() to resume normal operation.
*/
@ -446,7 +446,4 @@ malloc_fork_child(void)
}
text_set_element (_hurd_fork_prepare_hook, malloc_fork_prepare);
text_set_element (_hurd_fork_parent_hook, malloc_fork_parent);
text_set_element (_hurd_fork_child_hook, malloc_fork_child);
text_set_element (_hurd_preinit_hook, malloc_init);

4
hurd/hurdmalloc.h
View File

@ -12,6 +12,10 @@ extern void *_hurd_malloc (size_t);
extern void *_hurd_realloc (void *, size_t);
extern void _hurd_free (void *);
extern void _hurd_malloc_fork_prepare (void);
extern void _hurd_malloc_fork_parent (void);
extern void _hurd_malloc_fork_child (void);
#define malloc _hurd_malloc
#define realloc _hurd_realloc
#define free _hurd_free

15
sysdeps/mach/hurd/fork.c
View File

@ -108,12 +108,6 @@ __fork (void)
/* Run things that prepare for forking before we create the task. */
RUN_HOOK (_hurd_fork_prepare_hook, ());
/* Acquire malloc locks. This needs to come last because fork
handlers may use malloc, and the libio list lock has an
indirect malloc dependency as well (via the getdelim
function). */
call_function_static_weak (__malloc_fork_lock_parent);
/* Lock things that want to be locked before we fork. */
{
void *const *p;
@ -124,6 +118,13 @@ __fork (void)
}
__mutex_lock (&_hurd_siglock);
/* Acquire malloc locks. This needs to come last because fork
handlers may use malloc, and the libio list lock has an
indirect malloc dependency as well (via the getdelim
function). */
call_function_static_weak (__malloc_fork_lock_parent);
_hurd_malloc_fork_prepare ();
newtask = MACH_PORT_NULL;
thread = sigthread = MACH_PORT_NULL;
newproc = MACH_PORT_NULL;
@ -612,6 +613,7 @@ __fork (void)
}
/* Release malloc locks. */
_hurd_malloc_fork_parent ();
call_function_static_weak (__malloc_fork_unlock_parent);
/* Run things that want to run in the parent to restore it to
@ -666,6 +668,7 @@ __fork (void)
__sigemptyset (&_hurdsig_traced);
/* Release malloc locks. */
_hurd_malloc_fork_child ();
call_function_static_weak (__malloc_fork_unlock_child);
/* Run things that want to run in the child task to set up. */