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Make sure we commit enough memory in a new subheap.

This commit is contained in:
Andreas Mohr 2000-09-29 21:05:33 +00:00 committed by Alexandre Julliard
parent 5cfe17702e
commit bf69803ce3
1 changed files with 13 additions and 5 deletions
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18
memory/heap.c
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@ -33,16 +33,16 @@ DEFAULT_DEBUG_CHANNEL(heap);
typedef struct tagARENA_INUSE
{
DWORD size; /* Block size; must be the first field */
WORD threadId; /* Allocating thread id */
WORD magic; /* Magic number */
WORD threadId; /* Allocating thread id */
void *callerEIP; /* EIP of caller upon allocation */
} ARENA_INUSE;
typedef struct tagARENA_FREE
{
DWORD size; /* Block size; must be the first field */
WORD threadId; /* Freeing thread id */
WORD magic; /* Magic number */
WORD threadId; /* Freeing thread id */
struct tagARENA_FREE *next; /* Next free arena */
struct tagARENA_FREE *prev; /* Prev free arena */
} ARENA_FREE;
@ -446,7 +446,8 @@ static void HEAP_ShrinkBlock(SUBHEAP *subheap, ARENA_INUSE *pArena, DWORD size)
{
HEAP_CreateFreeBlock( subheap, (char *)(pArena + 1) + size,
(pArena->size & ARENA_SIZE_MASK) - size );
pArena->size = (pArena->size & ~ARENA_SIZE_MASK) | size;
/* assign size plus previous arena flags */
pArena->size = size | (pArena->size & ~ARENA_SIZE_MASK);
}
else
{
@ -636,7 +637,12 @@ static ARENA_FREE *HEAP_FindFreeBlock( HEAP *heap, DWORD size,
(DWORD)heap, size );
return NULL;
}
size += sizeof(SUBHEAP) + sizeof(ARENA_FREE);
/* make sure that we have a big enough size *committed* to fit another
* last free arena in !
* So just one heap struct, one first free arena which will eventually
* get inuse, and HEAP_MIN_BLOCK_SIZE for the second free arena that
* might get assigned all remaining free space in HEAP_ShrinkBlock() */
size += sizeof(SUBHEAP) + sizeof(ARENA_FREE) + HEAP_MIN_BLOCK_SIZE;
if (!(subheap = HEAP_CreateSubHeap( heap, heap->flags, size,
max( HEAP_DEF_SIZE, size ) )))
return NULL;
@ -721,6 +727,8 @@ static BOOL HEAP_ValidateFreeArena( SUBHEAP *subheap, ARENA_FREE *pArena )
if (!(pArena->prev->size & ARENA_FLAG_FREE) ||
(pArena->prev->magic != ARENA_FREE_MAGIC))
{
/* this often means that the prev arena got overwritten
* by a memory write before that prev arena */
ERR("Heap %08lx: prev arena %08lx invalid for %08lx\n",
(DWORD)subheap->heap, (DWORD)pArena->prev, (DWORD)pArena );
return FALSE;
@ -1102,10 +1110,10 @@ LPVOID WINAPI HeapAlloc(
if (!heapPtr) return NULL;
flags &= HEAP_GENERATE_EXCEPTIONS | HEAP_NO_SERIALIZE | HEAP_ZERO_MEMORY;
flags |= heapPtr->flags;
if (!(flags & HEAP_NO_SERIALIZE)) EnterCriticalSection( &heapPtr->critSection );
size = (size + 3) & ~3;
if (size < HEAP_MIN_BLOCK_SIZE) size = HEAP_MIN_BLOCK_SIZE;
if (!(flags & HEAP_NO_SERIALIZE)) EnterCriticalSection( &heapPtr->critSection );
/* Locate a suitable free block */
if (!(pArena = HEAP_FindFreeBlock( heapPtr, size, &subheap )))