32 lines
1.2 KiB
C
32 lines
1.2 KiB
C
#include "libc/mem/mem.h"
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#include "third_party/dlmalloc/dlmalloc.internal.h"
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/**
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* If possible, gives memory back to the system (via negative arguments
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* to sbrk) if there is unused memory at the `high` end of the malloc
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* pool or in unused MMAP segments. You can call this after freeing
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* large blocks of memory to potentially reduce the system-level memory
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* requirements of a program. However, it cannot guarantee to reduce
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* memory. Under some allocation patterns, some large free blocks of
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* memory will be locked between two used chunks, so they cannot be
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* given back to the system.
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*
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* The `pad` argument to malloc_trim represents the amount of free
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* trailing space to leave untrimmed. If this argument is zero, only the
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* minimum amount of memory to maintain internal data structures will be
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* left. Non-zero arguments can be supplied to maintain enough trailing
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* space to service future expected allocations without having to
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* re-obtain memory from the system.
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*
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* @return 1 if it actually released any memory, else 0
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*/
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int dlmalloc_trim(size_t pad) {
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int result = 0;
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ensure_initialization();
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if (!PREACTION(g_dlmalloc)) {
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result = dlmalloc_sys_trim(g_dlmalloc, pad);
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POSTACTION(g_dlmalloc);
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}
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return result;
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}
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