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
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
|
/* Copyright (C) 2016 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 3 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "libguile/_scm.h"
#include "libguile/hashtab.h"
#include "libguile/numbers.h"
#include "libguile/fdes-finalizers.h"
/* Table of fdes finalizers and associated lock. */
static scm_i_pthread_mutex_t fdes_finalizers_lock =
SCM_I_PTHREAD_MUTEX_INITIALIZER;
static SCM fdes_finalizers;
SCM_DEFINE (scm_add_fdes_finalizer_x, "add-fdes-finalizer!", 2, 0, 0,
(SCM fd, SCM finalizer),
"Add a finalizer that will be called when @var{fd} is closed.")
#define FUNC_NAME s_scm_add_fdes_finalizer_x
{
SCM h;
/* Check type. */
scm_to_uint (fd);
scm_i_pthread_mutex_lock (&fdes_finalizers_lock);
h = scm_hashv_create_handle_x (fdes_finalizers, fd, SCM_EOL);
scm_set_cdr_x (h, scm_cons (finalizer, scm_cdr (h)));
scm_i_pthread_mutex_unlock (&fdes_finalizers_lock);
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
SCM_DEFINE (scm_remove_fdes_finalizer_x, "remove-fdes-finalizer!", 2, 0, 0,
(SCM fd, SCM finalizer),
"Remove a finalizer that was previously added to the file\n"
"descriptor @var{fd}.")
#define FUNC_NAME s_scm_remove_fdes_finalizer_x
{
SCM h;
/* Check type. */
scm_to_uint (fd);
scm_i_pthread_mutex_lock (&fdes_finalizers_lock);
h = scm_hashv_get_handle (fdes_finalizers, fd);
if (scm_is_true (h))
scm_set_cdr_x (h, scm_delq1_x (finalizer, scm_cdr (h)));
scm_i_pthread_mutex_unlock (&fdes_finalizers_lock);
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
struct fdes_finalizer_data
{
SCM finalizer;
SCM fd;
};
static SCM
do_run_finalizer (void *data)
{
struct fdes_finalizer_data *fdata = data;
return scm_call_1 (fdata->finalizer, fdata->fd);
}
void
scm_run_fdes_finalizers (int fd)
{
SCM finalizers;
struct fdes_finalizer_data data;
data.fd = scm_from_int (fd);
scm_i_pthread_mutex_lock (&fdes_finalizers_lock);
finalizers = scm_hashv_ref (fdes_finalizers, data.fd, SCM_EOL);
if (!scm_is_null (finalizers))
scm_hashv_remove_x (fdes_finalizers, data.fd);
scm_i_pthread_mutex_unlock (&fdes_finalizers_lock);
for (; !scm_is_null (finalizers); finalizers = scm_cdr (finalizers))
{
data.finalizer = scm_car (finalizers);
scm_internal_catch (SCM_BOOL_T, do_run_finalizer, &data,
scm_handle_by_message_noexit, NULL);
}
}
static void
scm_init_fdes_finalizers (void)
{
#include "libguile/fdes-finalizers.x"
}
void
scm_register_fdes_finalizers ()
{
fdes_finalizers = scm_c_make_hash_table (0);
scm_c_register_extension ("libguile-" SCM_EFFECTIVE_VERSION,
"scm_init_fdes_finalizers",
(scm_t_extension_init_func) scm_init_fdes_finalizers,
NULL);
}
|
