57 lines
1.9 KiB
C
57 lines
1.9 KiB
C
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#include "libc/mem/mem.h"
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#include "third_party/dlmalloc/dlmalloc.h"
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/**
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* Frees and clears (sets to NULL) each non-null pointer in the given
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* array. This is likely to be faster than freeing them one-by-one. If
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* footers are used, pointers that have been allocated in different
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* mspaces are not freed or cleared, and the count of all such pointers
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* is returned. For large arrays of pointers with poor locality, it may
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* be worthwhile to sort this array before calling bulk_free.
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*/
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size_t bulk_free(void *array[], size_t nelem) {
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/*
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* Try to free all pointers in the given array. Note: this could be
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* made faster, by delaying consolidation, at the price of disabling
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* some user integrity checks, We still optimize some consolidations
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* by combining adjacent chunks before freeing, which will occur often
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* if allocated with ialloc or the array is sorted.
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*/
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size_t unfreed = 0;
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if (!PREACTION(gm)) {
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void **a;
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void **fence = &(array[nelem]);
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for (a = array; a != fence; ++a) {
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void *mem = *a;
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if (mem != 0) {
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mchunkptr p = mem2chunk(ADDRESS_DEATH_ACTION(mem));
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size_t psize = chunksize(p);
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#if FOOTERS
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if (get_mstate_for(p) != gm) {
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++unfreed;
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continue;
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}
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#endif
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check_inuse_chunk(gm, p);
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*a = 0;
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if (RTCHECK(ok_address(gm, p) && ok_inuse(p))) {
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void **b = a + 1; /* try to merge with next chunk */
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mchunkptr next = next_chunk(p);
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if (b != fence && *b == chunk2mem(next)) {
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size_t newsize = chunksize(next) + psize;
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set_inuse(gm, p, newsize);
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*b = chunk2mem(p);
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} else
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dlmalloc_dispose_chunk(gm, p, psize);
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} else {
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CORRUPTION_ERROR_ACTION(gm);
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break;
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}
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}
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}
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if (should_trim(gm, gm->topsize)) dlmalloc_sys_trim(gm, 0);
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POSTACTION(gm);
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}
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return unfreed;
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}
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