source: tests/zombies/gc_no_raii/pool-alloc/allocate-malloc.c @ 474d610

arm-ehjacob/cs343-translationnew-ast-unique-expr
Last change on this file since 474d610 was 87b9332, checked in by Andrew Beach <ajbeach@…>, 16 months ago

Moved 'examples/' to 'tests/zombies/'.

  • Property mode set to 100644
File size: 1.8 KB
Line 
1/*
2 * Allocation functions (malloc)
3 *
4 * Copyright (c) 2014, 2015 Gregor Richards
5 *
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
13 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
15 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
16 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19static void *allocPool(int mustSucceed)
20{
21    static ggc_mutex_t poolLock = GGC_MUTEX_INITIALIZER;
22    static unsigned char *space = NULL, *spaceEnd = NULL;
23    void *ret;
24
25    /* do we already have some available space? */
26    ggc_mutex_lock_raw(&poolLock);
27    if (!space || space + GGGGC_POOL_BYTES > spaceEnd) {
28        ggc_size_t i;
29
30        /* since we can't pre-align, align by getting as much as we can manage */
31        for (i = 16; i >= 2; i /= 2) {
32            space = malloc(GGGGC_POOL_BYTES * i);
33            if (space) break;
34        }
35        if (!space) {
36            if (mustSucceed) {
37                perror("malloc");
38                abort();
39            }
40            return NULL;
41        }
42        spaceEnd = space + GGGGC_POOL_BYTES * i;
43
44        /* align it */
45        space = (unsigned char *) GGGGC_POOL_OF(space + GGGGC_POOL_BYTES - 1);
46    }
47
48    ret = (struct GGGGC_Pool *) space;
49    space += GGGGC_POOL_BYTES;
50    ggc_mutex_unlock(&poolLock);
51
52    return ret;
53}
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