source: examples/gc_no_raii/pool-alloc/allocate-win-valloc.c@ bcb14b5

ADT aaron-thesis arm-eh ast-experimental cleanup-dtors deferred_resn enum forall-pointer-decay jacob/cs343-translation jenkins-sandbox new-ast new-ast-unique-expr no_list persistent-indexer pthread-emulation qualifiedEnum
Last change on this file since bcb14b5 was bf71cfd, checked in by Thierry Delisle <tdelisle@…>, 7 years ago

Moved up many directories in source

  • 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 = (unsigned char *)
26 VirtualAlloc(NULL, GGGGC_POOL_BYTES*2, MEM_COMMIT|MEM_RESERVE, PAGE_READWRITE);
27 if (space == NULL) {
28 if (mustSucceed) {
29 perror("mmap");
30 abort();
31 }
32 return NULL;
33 }
34
35 /* align it */
36 ret = GGGGC_POOL_OF(space + GGGGC_POOL_BYTES - 1);
37 aspace = (unsigned char *) ret;
38
39 /* free unused space */
40 if (aspace > space)
41 VirtualFree(space, aspace - space, MEM_RELEASE);
42 VirtualFree(aspace + GGGGC_POOL_BYTES, space + GGGGC_POOL_BYTES - aspace, MEM_RELEASE);
43
44 return ret;
45}
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