mirror of
https://github.com/crosstool-ng/crosstool-ng.git
synced 2024-12-25 07:21:05 +00:00
ca9b06fbe6
Commit in upstream buildroot: http://git.buildroot.org/buildroot/commit/?id=43ffd946ad569f3a1d0662de221cd4cb65bdc8e6 Everything on the 0_9_30 branch since the release (0.9.30.3 to be)
90 lines
3.4 KiB
Diff
90 lines
3.4 KiB
Diff
From fa476d01f1c1990a92ee49d1f1c557b83805d0e9 Mon Sep 17 00:00:00 2001
|
|
From: Freeman Wang <xwang@ubicom.com>
|
|
Date: Sat, 19 Dec 2009 13:43:00 -0800
|
|
Subject: [PATCH 09/15] malloc: fix race condition and other bugs in the no-mmu malloc
|
|
|
|
Fixes multiple race conditions on mmb list. This was done by
|
|
making the mmb_heap_lock into a recursive lock and making the
|
|
regular heap_lock extend to cover the mmb heap handling.
|
|
|
|
Also move the new_mmb allocation up to before the mmb list is
|
|
iterated through to find the insertion point. When the mmb_heap
|
|
also runs out and needs to be extended when the regular heap is
|
|
just extended, the mmb list could be messed up.
|
|
|
|
Signed-off-by: Freeman Wang <xwang@ubicom.com>
|
|
Signed-off-by: Austin Foxley <austinf@cetoncorp.com>
|
|
---
|
|
libc/stdlib/malloc/free.c | 6 +++---
|
|
libc/stdlib/malloc/malloc.c | 7 ++++---
|
|
2 files changed, 7 insertions(+), 6 deletions(-)
|
|
|
|
diff --git a/libc/stdlib/malloc/free.c b/libc/stdlib/malloc/free.c
|
|
index 90e18f4..741248a 100644
|
|
--- a/libc/stdlib/malloc/free.c
|
|
+++ b/libc/stdlib/malloc/free.c
|
|
@@ -179,14 +179,14 @@ __free_to_heap (void *mem, struct heap_free_area **heap
|
|
/* Start searching again from the end of this block. */
|
|
start = mmb_end;
|
|
|
|
+ /* Release the descriptor block we used. */
|
|
+ free_to_heap (mmb, &__malloc_mmb_heap, &__malloc_mmb_heap_lock);
|
|
+
|
|
/* We have to unlock the heap before we recurse to free the mmb
|
|
descriptor, because we might be unmapping from the mmb
|
|
heap. */
|
|
__heap_unlock (heap_lock);
|
|
|
|
- /* Release the descriptor block we used. */
|
|
- free_to_heap (mmb, &__malloc_mmb_heap, &__malloc_mmb_heap_lock);
|
|
-
|
|
/* Do the actual munmap. */
|
|
munmap ((void *)mmb_start, mmb_end - mmb_start);
|
|
|
|
diff --git a/libc/stdlib/malloc/malloc.c b/libc/stdlib/malloc/malloc.c
|
|
index 71f9e58..84a6acd 100644
|
|
--- a/libc/stdlib/malloc/malloc.c
|
|
+++ b/libc/stdlib/malloc/malloc.c
|
|
@@ -48,7 +48,7 @@ struct malloc_mmb *__malloc_mmapped_blocks = 0;
|
|
HEAP_DECLARE_STATIC_FREE_AREA (initial_mmb_fa, 48); /* enough for 3 mmbs */
|
|
struct heap_free_area *__malloc_mmb_heap = HEAP_INIT_WITH_FA (initial_mmb_fa);
|
|
#ifdef HEAP_USE_LOCKING
|
|
-pthread_mutex_t __malloc_mmb_heap_lock = PTHREAD_MUTEX_INITIALIZER;
|
|
+pthread_mutex_t __malloc_mmb_heap_lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
|
|
#endif
|
|
#endif /* __UCLIBC_UCLINUX_BROKEN_MUNMAP__ */
|
|
|
|
@@ -151,19 +151,19 @@ __malloc_from_heap (size_t size, struct heap_free_area **heap
|
|
/* Try again to allocate. */
|
|
mem = __heap_alloc (heap, &size);
|
|
|
|
- __heap_unlock (heap_lock);
|
|
|
|
#if !defined(MALLOC_USE_SBRK) && defined(__UCLIBC_UCLINUX_BROKEN_MUNMAP__)
|
|
/* Insert a record of BLOCK in sorted order into the
|
|
__malloc_mmapped_blocks list. */
|
|
|
|
+ new_mmb = malloc_from_heap (sizeof *new_mmb, &__malloc_mmb_heap, &__malloc_mmb_heap_lock);
|
|
+
|
|
for (prev_mmb = 0, mmb = __malloc_mmapped_blocks;
|
|
mmb;
|
|
prev_mmb = mmb, mmb = mmb->next)
|
|
if (block < mmb->mem)
|
|
break;
|
|
|
|
- new_mmb = malloc_from_heap (sizeof *new_mmb, &__malloc_mmb_heap, &__malloc_mmb_heap_lock);
|
|
new_mmb->next = mmb;
|
|
new_mmb->mem = block;
|
|
new_mmb->size = block_size;
|
|
@@ -177,6 +177,7 @@ __malloc_from_heap (size_t size, struct heap_free_area **heap
|
|
(unsigned)new_mmb,
|
|
(unsigned)new_mmb->mem, block_size);
|
|
#endif /* !MALLOC_USE_SBRK && __UCLIBC_UCLINUX_BROKEN_MUNMAP__ */
|
|
+ __heap_unlock (heap_lock);
|
|
}
|
|
}
|
|
|
|
--
|
|
1.6.6.1
|
|
|