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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
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#include "libimagequant.h"
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#include "mempool.h"
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#include <stdlib.h>
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#include <stdint.h>
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#include <assert.h>
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#define ALIGN_MASK 15UL
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#define MEMPOOL_RESERVED ((sizeof(struct mempool)+ALIGN_MASK) & ~ALIGN_MASK)
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struct mempool
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{
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unsigned int used, size;
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void *(*malloc) (size_t);
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void (*free) (void *);
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struct mempool *next;
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};
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LIQ_PRIVATE void *
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mempool_create (mempool * mptr, const unsigned int size, unsigned int max_size,
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void *(*malloc) (size_t), void (*free) (void *))
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{
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mempool old;
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uintptr_t mptr_used_start;
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if (*mptr && ((*mptr)->used + size) <= (*mptr)->size) {
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unsigned int prevused = (*mptr)->used;
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(*mptr)->used += (size + 15UL) & ~0xFUL;
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return ((char *) (*mptr)) + prevused;
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}
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old = *mptr;
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if (!max_size)
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max_size = (1 << 17);
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max_size = size + ALIGN_MASK > max_size ? size + ALIGN_MASK : max_size;
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*mptr = malloc (MEMPOOL_RESERVED + max_size);
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if (!*mptr)
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return NULL;
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**mptr = (struct mempool) {
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.malloc = malloc,.free = free,.size = MEMPOOL_RESERVED + max_size,.used =
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sizeof (struct mempool),.next = old,};
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mptr_used_start = (uintptr_t) (*mptr) + (*mptr)->used;
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(*mptr)->used += (ALIGN_MASK + 1 - (mptr_used_start & ALIGN_MASK)) & ALIGN_MASK; // reserve bytes required to make subsequent allocations aligned
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assert (!(((uintptr_t) (*mptr) + (*mptr)->used) & ALIGN_MASK));
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return mempool_alloc (mptr, size, size);
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}
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LIQ_PRIVATE void *
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mempool_alloc (mempool * mptr, unsigned int size, unsigned int max_size)
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{
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if (((*mptr)->used + size) <= (*mptr)->size) {
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unsigned int prevused = (*mptr)->used;
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(*mptr)->used += (size + ALIGN_MASK) & ~ALIGN_MASK;
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return ((char *) (*mptr)) + prevused;
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}
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return mempool_create (mptr, size, max_size, (*mptr)->malloc, (*mptr)->free);
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}
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LIQ_PRIVATE void
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mempool_destroy (mempool m)
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{
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while (m) {
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mempool next = m->next;
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m->free (m);
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m = next;
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}
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}
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