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* allocatestack.c (queue_stack): Move freeing of surplus stacks to...

Browse Source 
(free_stacks): ...here.
	(__free_stack_cache): New function.
	* pthreadP.h: Declare __free_stack_cache.
	* sysdeps/pthread/pthread-functions.h (pthread_functions): Add
	ptr_freeres.
	* init.c (pthread_functions): Initialize ptr_freeres.
	* sysdeps/unix/sysv/linux/libc_pthread_init.c (freeres_libptread):
	New freeres function.
This commit is contained in:
Ulrich Drepper 2006-08-23 17:47:19 +00:00
parent 9a464a6eff
commit ba408f8465
6 changed files with 72 additions and 35 deletions
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12
nptl/ChangeLog
View File

@ -1,3 +1,15 @@
2006-08-23 Ulrich Drepper <drepper@redhat.com>
* allocatestack.c (queue_stack): Move freeing of surplus stacks to...
(free_stacks): ...here.
(__free_stack_cache): New function.
* pthreadP.h: Declare __free_stack_cache.
* sysdeps/pthread/pthread-functions.h (pthread_functions): Add
ptr_freeres.
* init.c (pthread_functions): Initialize ptr_freeres.
* sysdeps/unix/sysv/linux/libc_pthread_init.c (freeres_libptread):
New freeres function.
2006-07-30 Joseph S. Myers <joseph@codesourcery.com>
[BZ #3018]

78
nptl/allocatestack.c
View File

@ -211,6 +211,45 @@ get_cached_stack (size_t *sizep, void **memp)
}
/* Free stacks until cache size is lower than LIMIT. */
static void
free_stacks (size_t limit)
{
/* We reduce the size of the cache. Remove the last entries until
the size is below the limit. */
list_t *entry;
list_t *prev;
/* Search from the end of the list. */
list_for_each_prev_safe (entry, prev, &stack_cache)
{
struct pthread *curr;
curr = list_entry (entry, struct pthread, list);
if (FREE_P (curr))
{
/* Unlink the block. */
list_del (entry);
/* Account for the freed memory. */
stack_cache_actsize -= curr->stackblock_size;
/* Free the memory associated with the ELF TLS. */
_dl_deallocate_tls (TLS_TPADJ (curr), false);
/* Remove this block. This should never fail. If it does
something is really wrong. */
if (munmap (curr->stackblock, curr->stackblock_size) != 0)
abort ();
/* Maybe we have freed enough. */
if (stack_cache_actsize <= limit)
break;
}
}
}
/* Add a stack frame which is not used anymore to the stack. Must be
called with the cache lock held. */
static inline void
@ -224,40 +263,15 @@ queue_stack (struct pthread *stack)
stack_cache_actsize += stack->stackblock_size;
if (__builtin_expect (stack_cache_actsize > stack_cache_maxsize, 0))
{
/* We reduce the size of the cache. Remove the last entries
until the size is below the limit. */
list_t *entry;
list_t *prev;
free_stacks (stack_cache_maxsize);
}
/* Search from the end of the list. */
list_for_each_prev_safe (entry, prev, &stack_cache)
{
struct pthread *curr;
curr = list_entry (entry, struct pthread, list);
if (FREE_P (curr))
{
/* Unlink the block. */
list_del (entry);
/* Account for the freed memory. */
stack_cache_actsize -= curr->stackblock_size;
/* Free the memory associated with the ELF TLS. */
_dl_deallocate_tls (TLS_TPADJ (curr), false);
/* Remove this block. This should never fail. If it
does something is really wrong. */
if (munmap (curr->stackblock, curr->stackblock_size) != 0)
abort ();
/* Maybe we have freed enough. */
if (stack_cache_actsize <= stack_cache_maxsize)
break;
}
}
}
/* This function is called indirectly from the freeres code in libc. */
void
__free_stack_cache (void)
{
free_stacks (0);
}

4
nptl/init.c
View File

@ -136,7 +136,9 @@ static const struct pthread_functions pthread_functions =
.ptr_nthreads = &__nptl_nthreads,
.ptr___pthread_unwind = &__pthread_unwind,
.ptr__nptl_deallocate_tsd = __nptl_deallocate_tsd,
.ptr__nptl_setxid = __nptl_setxid
.ptr__nptl_setxid = __nptl_setxid,
/* For now only the stack cache needs to be freed. */
.ptr_freeres = __free_stack_cache
};
# define ptr_pthread_functions &pthread_functions
#else

2
nptl/pthreadP.h
View File

@ -543,6 +543,8 @@ extern void __nptl_deallocate_tsd (void) attribute_hidden;
extern int __nptl_setxid (struct xid_command *cmdp) attribute_hidden;
extern void __free_stack_cache (void) attribute_hidden;
#ifdef SHARED
# define PTHREAD_STATIC_FN_REQUIRE(name)
#else

3
nptl/sysdeps/pthread/pthread-functions.h
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@ -1,4 +1,4 @@
/* Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
/* Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
@ -95,6 +95,7 @@ struct pthread_functions
__attribute ((noreturn)) __cleanup_fct_attribute;
void (*ptr__nptl_deallocate_tsd) (void);
int (*ptr__nptl_setxid) (struct xid_command *);
void (*ptr_freeres) (void);
};
/* Variable in libc.so. */

8
nptl/sysdeps/unix/sysv/linux/libc_pthread_init.c
View File

@ -1,4 +1,4 @@
/* Copyright (C) 2002, 2003, 2005 Free Software Foundation, Inc.
/* Copyright (C) 2002, 2003, 2005, 2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
@ -57,3 +57,9 @@ __libc_pthread_init (ptr, reclaim, functions)
return &__libc_multiple_threads;
#endif
}
libc_freeres_fn (freeres_libptread)
{
__libc_pthread_functions.ptr_freeres ();
}