43 lines
1.4 KiB
C
43 lines
1.4 KiB
C
#include "libc/limits.h"
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#include "libc/mem/mem.h"
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#include "third_party/dlmalloc/dlmalloc.internal.h"
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/**
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* Sets memory allocation parameter.
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*
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* The format is to provide a (parameter-number, parameter-value) pair.
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* mallopt then sets the corresponding parameter to the argument value
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* if it can (i.e., so long as the value is meaningful), and returns 1
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* if successful else 0. SVID/XPG/ANSI defines four standard param
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* numbers for mallopt, normally defined in malloc.h. None of these are
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* use in this malloc, so setting them has no effect. But this malloc
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* also supports other options in mallopt:
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*
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* Symbol param # default allowed param values
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* M_TRIM_THRESHOLD -1 2*1024*1024 any (-1U disables trimming)
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* M_GRANULARITY -2 page size any power of 2 >= page size
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* M_MMAP_THRESHOLD -3 256*1024 any (or 0 if no MMAP support)
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*/
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bool32 mallopt(int param_number, int value) {
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size_t val;
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ensure_initialization();
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val = (value == -1) ? SIZE_MAX : (size_t)value;
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switch (param_number) {
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case M_TRIM_THRESHOLD:
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g_mparams.trim_threshold = val;
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return true;
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case M_GRANULARITY:
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if (val >= g_mparams.page_size && ((val & (val - 1)) == 0)) {
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g_mparams.granularity = val;
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return true;
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} else {
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return false;
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}
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case M_MMAP_THRESHOLD:
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g_mparams.mmap_threshold = val;
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return true;
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default:
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return false;
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}
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}
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