1/*
2 * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10/* This must be the first #include file */
11#include "../async_local.h"
12
13#ifdef ASYNC_POSIX
14
15# include <stddef.h>
16# include <unistd.h>
17
18#define STACKSIZE 32768
19
20int ASYNC_is_capable(void)
21{
22 ucontext_t ctx;
23
24 /*
25 * Some platforms provide getcontext() but it does not work (notably
26 * MacOSX PPC64). Check for a working getcontext();
27 */
28 return getcontext(&ctx) == 0;
29}
30
31void async_local_cleanup(void)
32{
33}
34
35int async_fibre_makecontext(async_fibre *fibre)
36{
37 fibre->env_init = 0;
38 if (getcontext(&fibre->fibre) == 0) {
39 fibre->fibre.uc_stack.ss_sp = OPENSSL_malloc(STACKSIZE);
40 if (fibre->fibre.uc_stack.ss_sp != NULL) {
41 fibre->fibre.uc_stack.ss_size = STACKSIZE;
42 fibre->fibre.uc_link = NULL;
43 makecontext(&fibre->fibre, async_start_func, 0);
44 return 1;
45 }
46 } else {
47 fibre->fibre.uc_stack.ss_sp = NULL;
48 }
49 return 0;
50}
51
52void async_fibre_free(async_fibre *fibre)
53{
54 OPENSSL_free(fibre->fibre.uc_stack.ss_sp);
55 fibre->fibre.uc_stack.ss_sp = NULL;
56}
57
58#endif
59