* under the terms of the license (GNU LGPL) which comes with this package. */
#include "mmprivate.h"
+#include "xbt/ex.h"
/* Return memory to the heap.
Like `mfree' but don't call a mfree_hook if there is one. */
-void __mmalloc_free(struct mdesc *mdp, void *ptr)
+/* Return memory to the heap. */
+void mfree(struct mdesc *mdp, void *ptr)
{
int type;
- size_t block;
+ size_t block, frag_nb;
register size_t i;
struct list *prev, *next;
+ int it;
+
+ if (ptr == NULL)
+ return;
block = BLOCK(ptr);
if ((char *) ptr < (char *) mdp->heapbase || block > mdp->heapsize) {
- printf("Ouch, this pointer is not mine. I refuse to free it.\n");
- return;
+ fprintf(stderr,"Ouch, this pointer is not mine. I refuse to free it. I refuse it to death!!\n");
+ abort();
}
- type = mdp->heapinfo[block].busy.type;
+ type = mdp->heapinfo[block].type;
+
switch (type) {
+ case -1: /* Already free */
+ THROWF(system_error, 0, "Asked to free a fragment in a block that is already free. I'm puzzled\n");
+ break;
+
case 0:
/* Get as many statistics as early as we can. */
- mdp->heapstats.chunks_used--;
- mdp->heapstats.bytes_used -=
- mdp->heapinfo[block].busy.info.size * BLOCKSIZE;
- mdp->heapstats.bytes_free +=
- mdp->heapinfo[block].busy.info.size * BLOCKSIZE;
+ mdp -> heapstats.chunks_used--;
+ mdp -> heapstats.bytes_used -=
+ mdp -> heapinfo[block].busy_block.size * BLOCKSIZE;
+ mdp -> heapstats.bytes_free +=
+ mdp -> heapinfo[block].busy_block.size * BLOCKSIZE;
/* Find the free cluster previous to this one in the free list.
Start searching at the last block referenced; this may benefit
i = mdp->heapindex;
if (i > block) {
while (i > block) {
- i = mdp->heapinfo[i].free.prev;
+ i = mdp->heapinfo[i].free_block.prev;
}
} else {
do {
- i = mdp->heapinfo[i].free.next;
+ i = mdp->heapinfo[i].free_block.next;
}
while ((i != 0) && (i < block));
- i = mdp->heapinfo[i].free.prev;
+ i = mdp->heapinfo[i].free_block.prev;
}
/* Determine how to link this block into the free list. */
- if (block == i + mdp->heapinfo[i].free.size) {
+ if (block == i + mdp->heapinfo[i].free_block.size) {
+
/* Coalesce this block with its predecessor. */
- mdp->heapinfo[i].free.size += mdp->heapinfo[block].busy.info.size;
+ mdp->heapinfo[i].free_block.size += mdp->heapinfo[block].busy_block.size;
+ /* Mark all my ex-blocks as free */
+ for (it=0; it<mdp->heapinfo[block].busy_block.size; it++) {
+ if (mdp->heapinfo[block+it].type <0) {
+ fprintf(stderr,"Internal Error: Asked to free a block already marked as free (block=%lu it=%d type=%lu). Please report this bug.\n",
+ (unsigned long)block,it,(unsigned long)mdp->heapinfo[block].type);
+ abort();
+ }
+ mdp->heapinfo[block+it].type = -1;
+ }
+
block = i;
} else {
+ //fprintf(stderr,"Free block %d to %d (as a new chunck)\n",block,block+mdp->heapinfo[block].busy_block.size);
/* Really link this block back into the free list. */
- mdp->heapinfo[block].free.size = mdp->heapinfo[block].busy.info.size;
- mdp->heapinfo[block].free.next = mdp->heapinfo[i].free.next;
- mdp->heapinfo[block].free.prev = i;
- mdp->heapinfo[i].free.next = block;
- mdp->heapinfo[mdp->heapinfo[block].free.next].free.prev = block;
- mdp->heapstats.chunks_free++;
+ mdp->heapinfo[block].free_block.size = mdp->heapinfo[block].busy_block.size;
+ mdp->heapinfo[block].free_block.next = mdp->heapinfo[i].free_block.next;
+ mdp->heapinfo[block].free_block.prev = i;
+ mdp->heapinfo[i].free_block.next = block;
+ mdp->heapinfo[mdp->heapinfo[block].free_block.next].free_block.prev = block;
+ mdp -> heapstats.chunks_free++;
+ /* Mark all my ex-blocks as free */
+ for (it=0; it<mdp->heapinfo[block].free_block.size; it++) {
+ if (mdp->heapinfo[block+it].type <0) {
+ fprintf(stderr,"Internal error: Asked to free a block already marked as free (block=%lu it=%d/%lu type=%lu). Please report this bug.\n",
+ (unsigned long)block,it,(unsigned long)mdp->heapinfo[block].free_block.size,(unsigned long)mdp->heapinfo[block].type);
+ abort();
+ }
+ mdp->heapinfo[block+it].type = -1;
+ }
}
/* Now that the block is linked in, see if we can coalesce it
with its successor (by deleting its successor from the list
and adding in its size). */
- if (block + mdp->heapinfo[block].free.size ==
- mdp->heapinfo[block].free.next) {
- mdp->heapinfo[block].free.size
- += mdp->heapinfo[mdp->heapinfo[block].free.next].free.size;
- mdp->heapinfo[block].free.next
- = mdp->heapinfo[mdp->heapinfo[block].free.next].free.next;
- mdp->heapinfo[mdp->heapinfo[block].free.next].free.prev = block;
- mdp->heapstats.chunks_free--;
+ if (block + mdp->heapinfo[block].free_block.size ==
+ mdp->heapinfo[block].free_block.next) {
+ mdp->heapinfo[block].free_block.size
+ += mdp->heapinfo[mdp->heapinfo[block].free_block.next].free_block.size;
+ mdp->heapinfo[block].free_block.next
+ = mdp->heapinfo[mdp->heapinfo[block].free_block.next].free_block.next;
+ mdp->heapinfo[mdp->heapinfo[block].free_block.next].free_block.prev = block;
+ mdp -> heapstats.chunks_free--;
}
/* Now see if we can return stuff to the system. */
/* blocks = mdp -> heapinfo[block].free.size;
- if (blocks >= FINAL_FREE_BLOCKS && block + blocks == mdp -> heaplimit
- && mdp -> morecore (mdp, 0) == ADDRESS (block + blocks))
- {
- register size_t bytes = blocks * BLOCKSIZE;
- mdp -> heaplimit -= blocks;
- mdp -> morecore (mdp, -bytes);
- mdp -> heapinfo[mdp -> heapinfo[block].free.prev].free.next
- = mdp -> heapinfo[block].free.next;
- mdp -> heapinfo[mdp -> heapinfo[block].free.next].free.prev
- = mdp -> heapinfo[block].free.prev;
- block = mdp -> heapinfo[block].free.prev;
- mdp -> heapstats.chunks_free--;
- mdp -> heapstats.bytes_free -= bytes;
- } */
+ if (blocks >= FINAL_FREE_BLOCKS && block + blocks == mdp -> heaplimit
+ && mdp -> morecore (mdp, 0) == ADDRESS (block + blocks))
+ {
+ register size_t bytes = blocks * BLOCKSIZE;
+ mdp -> heaplimit -= blocks;
+ mdp -> morecore (mdp, -bytes);
+ mdp -> heapinfo[mdp -> heapinfo[block].free.prev].free.next
+ = mdp -> heapinfo[block].free.next;
+ mdp -> heapinfo[mdp -> heapinfo[block].free.next].free.prev
+ = mdp -> heapinfo[block].free.prev;
+ block = mdp -> heapinfo[block].free.prev;
+ mdp -> heapstats.chunks_free--;
+ mdp -> heapstats.bytes_free -= bytes;
+ } */
/* Set the next search to begin at this block. */
mdp->heapindex = block;
default:
/* Do some of the statistics. */
- mdp->heapstats.chunks_used--;
- mdp->heapstats.bytes_used -= 1 << type;
- mdp->heapstats.chunks_free++;
- mdp->heapstats.bytes_free += 1 << type;
+ mdp -> heapstats.chunks_used--;
+ mdp -> heapstats.bytes_used -= 1 << type;
+ mdp -> heapstats.chunks_free++;
+ mdp -> heapstats.bytes_free += 1 << type;
/* Get the address of the first free fragment in this block. */
prev = (struct list *)
- ((char *) ADDRESS(block) +
- (mdp->heapinfo[block].busy.info.frag.first << type));
+ ((char *) ADDRESS(block) +
+ (mdp->heapinfo[block].busy_frag.first << type));
+
+ /* Set size used in the fragment to 0 */
+ frag_nb = RESIDUAL(ptr, BLOCKSIZE) >> type;
+
+ if( mdp->heapinfo[block].busy_frag.frag_size[frag_nb] == 0)
+ THROWF(system_error, 0, "Asked to free a fragment that is already free. I'm puzzled\n");
+
+ mdp->heapinfo[block].busy_frag.frag_size[frag_nb] = 0;
- if (mdp->heapinfo[block].busy.info.frag.nfree ==
+ if (mdp->heapinfo[block].busy_frag.nfree ==
(BLOCKSIZE >> type) - 1) {
/* If all fragments of this block are free, remove them
from the fragment list and free the whole block. */
if (next != NULL) {
next->prev = prev->prev;
}
- mdp->heapinfo[block].busy.type = 0;
- mdp->heapinfo[block].busy.info.size = 1;
-
+ /* pretend that this block is used and free it so that it gets properly coalesced with adjacent free blocks */
+ mdp->heapinfo[block].type = 0;
+ mdp->heapinfo[block].busy_block.size = 1;
+ mdp->heapinfo[block].busy_block.busy_size = 0;
+
/* Keep the statistics accurate. */
- mdp->heapstats.chunks_used++;
- mdp->heapstats.bytes_used += BLOCKSIZE;
- mdp->heapstats.chunks_free -= BLOCKSIZE >> type;
- mdp->heapstats.bytes_free -= BLOCKSIZE;
-
+ mdp -> heapstats.chunks_used++;
+ mdp -> heapstats.bytes_used += BLOCKSIZE;
+ mdp -> heapstats.chunks_free -= BLOCKSIZE >> type;
+ mdp -> heapstats.bytes_free -= BLOCKSIZE;
+
mfree((void *) mdp, (void *) ADDRESS(block));
- } else if (mdp->heapinfo[block].busy.info.frag.nfree != 0) {
+ } else if (mdp->heapinfo[block].busy_frag.nfree != 0) {
/* If some fragments of this block are free, link this
fragment into the fragment list after the first free
fragment of this block. */
if (next->next != NULL) {
next->next->prev = next;
}
- ++mdp->heapinfo[block].busy.info.frag.nfree;
+ ++mdp->heapinfo[block].busy_frag.nfree;
} else {
- /* No fragments of this block are free, so link this
- fragment into the fragment list and announce that
- it is the first free fragment of this block. */
+ /* No fragments of this block were free before the one we just released,
+ * so link this fragment into the fragment list and announce that
+ it is the first free fragment of this block. */
prev = (struct list *) ptr;
- mdp->heapinfo[block].busy.info.frag.nfree = 1;
- mdp->heapinfo[block].busy.info.frag.first =
- RESIDUAL(ptr, BLOCKSIZE) >> type;
+ mdp->heapinfo[block].busy_frag.nfree = 1;
+ mdp->heapinfo[block].busy_frag.first = frag_nb;
prev->next = mdp->fraghead[type].next;
prev->prev = &mdp->fraghead[type];
prev->prev->next = prev;
break;
}
}
-
-/* Return memory to the heap. */
-
-void mfree(void *md, void *ptr)
-{
- struct mdesc *mdp;
- register struct alignlist *l;
-
- if (ptr != NULL) {
- mdp = MD_TO_MDP(md);
- for (l = mdp->aligned_blocks; l != NULL; l = l->next) {
- if (l->aligned == ptr) {
- l->aligned = NULL; /* Mark the slot in the list as free. */
- ptr = l->exact;
- break;
- }
- }
- if (mdp->mfree_hook != NULL) {
- mdp->mfree_hook(mdp, ptr);
- } else {
- __mmalloc_free(mdp, ptr);
- }
- }
-}
