blob: 0a1ffbf8d06ba913d4caec27b174302b89d62c99 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
/*
* Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/* This must be the first #include file */
#include "../async_local.h"
#ifdef ASYNC_POSIX
# include <stddef.h>
# include <unistd.h>
# include <openssl/err.h>
#define STACKSIZE 32768
static void *async_stack_alloc(size_t *num);
static void async_stack_free(void *addr);
static int allow_customize = 1;
static ASYNC_stack_alloc_fn stack_alloc_impl = async_stack_alloc;
static ASYNC_stack_free_fn stack_free_impl = async_stack_free;
int ASYNC_is_capable(void)
{
ucontext_t ctx;
/*
* Some platforms provide getcontext() but it does not work (notably
* MacOSX PPC64). Check for a working getcontext();
*/
return getcontext(&ctx) == 0;
}
int ASYNC_set_mem_functions(ASYNC_stack_alloc_fn alloc_fn,
ASYNC_stack_free_fn free_fn)
{
if (!allow_customize)
return 0;
if (alloc_fn != NULL)
stack_alloc_impl = alloc_fn;
if (free_fn != NULL)
stack_free_impl = free_fn;
return 1;
}
void ASYNC_get_mem_functions(ASYNC_stack_alloc_fn *alloc_fn,
ASYNC_stack_free_fn *free_fn)
{
if (alloc_fn != NULL)
*alloc_fn = stack_alloc_impl;
if (free_fn != NULL)
*free_fn = stack_free_impl;
}
static void *async_stack_alloc(size_t *num)
{
return OPENSSL_malloc(*num);
}
static void async_stack_free(void *addr)
{
OPENSSL_free(addr);
}
void async_local_cleanup(void)
{
}
int async_fibre_makecontext(async_fibre *fibre)
{
#ifndef USE_SWAPCONTEXT
fibre->env_init = 0;
#endif
if (getcontext(&fibre->fibre) == 0) {
size_t num = STACKSIZE;
/*
* Disallow customisation after the first
* stack is allocated.
*/
if (allow_customize)
allow_customize = 0;
fibre->fibre.uc_stack.ss_sp = stack_alloc_impl(&num);
if (fibre->fibre.uc_stack.ss_sp != NULL) {
fibre->fibre.uc_stack.ss_size = num;
fibre->fibre.uc_link = NULL;
makecontext(&fibre->fibre, async_start_func, 0);
return 1;
}
ERR_raise(ERR_LIB_ASYNC, ERR_R_MALLOC_FAILURE);
} else {
fibre->fibre.uc_stack.ss_sp = NULL;
}
return 0;
}
void async_fibre_free(async_fibre *fibre)
{
stack_free_impl(fibre->fibre.uc_stack.ss_sp);
fibre->fibre.uc_stack.ss_sp = NULL;
}
#endif
|