mirror of
https://github.com/morgan9e/systemd
synced 2026-04-15 17:06:39 +09:00
b01f31954f
Before we had the following scheme: mempool_enabled() would check mempool_use_allowed, and libsystemd-shared would be linked with a .c file that provides mempool_use_allowed=true, while other things would linked with a different .c file with mempool_use_allowed=false. In the new scheme, mempool_enabled() itself is a weak symbol. If it's not found, we assume false. So it only needs to be provided for libsystemd-shared, where it can return false or true. test-set-disable-mempool is libshared, so it gets the symbol. But then we actually disable the mempool via envvar. mempool_enable() is called to check its return value directly.
84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <stdint.h>
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#include <stdlib.h>
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#include "macro.h"
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#include "memory-util.h"
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#include "mempool.h"
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struct pool {
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struct pool *next;
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size_t n_tiles;
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size_t n_used;
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};
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void* mempool_alloc_tile(struct mempool *mp) {
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size_t i;
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/* When a tile is released we add it to the list and simply
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* place the next pointer at its offset 0. */
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assert(mp->tile_size >= sizeof(void*));
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assert(mp->at_least > 0);
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if (mp->freelist) {
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void *r;
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r = mp->freelist;
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mp->freelist = * (void**) mp->freelist;
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return r;
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}
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if (_unlikely_(!mp->first_pool) ||
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_unlikely_(mp->first_pool->n_used >= mp->first_pool->n_tiles)) {
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size_t size, n;
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struct pool *p;
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n = mp->first_pool ? mp->first_pool->n_tiles : 0;
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n = MAX(mp->at_least, n * 2);
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size = PAGE_ALIGN(ALIGN(sizeof(struct pool)) + n*mp->tile_size);
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n = (size - ALIGN(sizeof(struct pool))) / mp->tile_size;
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p = malloc(size);
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if (!p)
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return NULL;
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p->next = mp->first_pool;
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p->n_tiles = n;
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p->n_used = 0;
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mp->first_pool = p;
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}
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i = mp->first_pool->n_used++;
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return ((uint8_t*) mp->first_pool) + ALIGN(sizeof(struct pool)) + i*mp->tile_size;
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}
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void* mempool_alloc0_tile(struct mempool *mp) {
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void *p;
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p = mempool_alloc_tile(mp);
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if (p)
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memzero(p, mp->tile_size);
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return p;
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}
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void mempool_free_tile(struct mempool *mp, void *p) {
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* (void**) p = mp->freelist;
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mp->freelist = p;
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}
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#if VALGRIND
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void mempool_drop(struct mempool *mp) {
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struct pool *p = mp->first_pool;
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while (p) {
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struct pool *n;
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n = p->next;
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free(p);
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p = n;
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}
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}
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#endif
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