source: tests/zombies/gc_no_raii/pool-alloc/allocate-mmap.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: 1.5 KB
Line 
1/*
2 * Allocation functions (mmap)
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    unsigned char *space, *aspace;
22    struct GGGGC_Pool *ret;
23
24    /* allocate enough space that we can align it later */
25    space = mmap(NULL, GGGGC_POOL_BYTES*2, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0);
26    if (space == NULL) {
27        if (mustSucceed) {
28            perror("mmap");
29            abort();
30        }
31        return NULL;
32    }
33
34    /* align it */
35    ret = GGGGC_POOL_OF(space + GGGGC_POOL_BYTES - 1);
36    aspace = (unsigned char *) ret;
37
38    /* free unused space */
39    if (aspace > space)
40        munmap(space, aspace - space);
41    munmap(aspace + GGGGC_POOL_BYTES, space + GGGGC_POOL_BYTES - aspace);
42
43    return ret;
44}
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