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
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
/* -*- Mode: C; c-basic-offset: 4 -*-
* vim: tabstop=4 shiftwidth=4 expandtab
*
* pygi-closure.c: PyGI C Closure functions
*
* 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 2.1 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
*/
#include "pygi-private.h"
/* This maintains a list of closures which can be free'd whenever
as they have been called. We will free them on the next
library function call.
*/
static GSList* async_free_list;
void
_pygi_closure_handle (ffi_cif *cif,
void *result,
void **args,
void *data)
{
PyGILState_STATE state;
PyGICClosure *closure = data;
gint n_args, i;
GIArgInfo *arg_info;
GIDirection arg_direction;
GITypeInfo *arg_type;
GITransfer arg_transfer;
GITypeTag arg_tag;
GITypeTag return_tag;
GITransfer return_transfer;
GITypeInfo *return_type;
PyObject *retval;
PyObject *py_args;
PyObject *pyarg;
gint n_in_args, n_out_args;
/* Lock the GIL as we are coming into this code without the lock and we
may be executing python code */
state = PyGILState_Ensure();
return_type = g_callable_info_get_return_type(closure->info);
return_tag = g_type_info_get_tag(return_type);
return_transfer = g_callable_info_get_caller_owns(closure->info);
n_args = g_callable_info_get_n_args (closure->info);
py_args = PyTuple_New(n_args);
if (py_args == NULL) {
PyErr_Clear();
goto end;
}
n_in_args = 0;
for (i = 0; i < n_args; i++) {
arg_info = g_callable_info_get_arg (closure->info, i);
arg_type = g_arg_info_get_type (arg_info);
arg_transfer = g_arg_info_get_ownership_transfer(arg_info);
arg_tag = g_type_info_get_tag(arg_type);
arg_direction = g_arg_info_get_direction(arg_info);
switch (arg_tag){
case GI_TYPE_TAG_VOID:
{
if (g_type_info_is_pointer(arg_type)) {
if (PyTuple_SetItem(py_args, n_in_args, closure->user_data) != 0) {
PyErr_Clear();
goto end;
}
n_in_args++;
continue;
}
}
case GI_TYPE_TAG_ERROR:
{
continue;
}
default:
{
pyarg = _pygi_argument_to_object (args[i],
arg_type,
arg_transfer);
if(PyTuple_SetItem(py_args, n_in_args, pyarg) != 0) {
PyErr_Clear();
goto end;
}
n_in_args++;
g_base_info_unref((GIBaseInfo*)arg_info);
g_base_info_unref((GIBaseInfo*)arg_type);
}
}
}
if(_PyTuple_Resize (&py_args, n_in_args) != 0) {
PyErr_Clear();
goto end;
}
retval = PyObject_CallObject((PyObject *)closure->function, py_args);
Py_DECREF(py_args);
if (retval == NULL) {
goto end;
}
*(GArgument*)result = _pygi_argument_from_object(retval, return_type, return_transfer);
end:
g_base_info_unref((GIBaseInfo*)return_type);
PyGILState_Release(state);
if (closure->user_data)
Py_XDECREF(closure->user_data);
/* Now that the closure has finished we can make a decision about how
to free it. Scope call gets free'd now, scope notified will be freed
when the notify is called and we can free async anytime we want
once we return from this function */
switch (closure->scope) {
case GI_SCOPE_TYPE_CALL:
_pygi_invoke_closure_free(closure);
break;
case GI_SCOPE_TYPE_NOTIFIED:
break;
case GI_SCOPE_TYPE_ASYNC:
/* Append this PyGICClosure to a list of closure that we will free
after we're done with this function invokation */
async_free_list = g_slist_prepend(async_free_list, closure);
break;
default:
g_assert_not_reached();
}
}
void _pygi_invoke_closure_free(gpointer data)
{
PyGICClosure* invoke_closure = (PyGICClosure *)data;
Py_DECREF(invoke_closure->function);
g_callable_info_free_closure(invoke_closure->info,
invoke_closure->closure);
if (invoke_closure->info)
g_base_info_unref((GIBaseInfo*)invoke_closure->info);
g_slice_free(PyGICClosure, invoke_closure);
}
PyGICClosure*
_pygi_make_native_closure (GICallableInfo* info,
GIScopeType scope,
PyObject *py_function,
gpointer py_user_data)
{
PyGICClosure *closure;
ffi_closure *fficlosure;
/* Begin by cleaning up old async functions */
g_slist_foreach(async_free_list, (GFunc)_pygi_invoke_closure_free, NULL);
g_slist_free(async_free_list);
async_free_list = NULL;
/* Build the closure itself */
closure = g_slice_new0(PyGICClosure);
closure->info = (GICallableInfo *) g_base_info_ref ((GIBaseInfo *) info);
closure->function = py_function;
closure->user_data = py_user_data;
Py_INCREF(py_function);
if (closure->user_data)
Py_INCREF(closure->user_data);
fficlosure =
g_callable_info_prepare_closure (info, &closure->cif, _pygi_closure_handle,
closure);
closure->closure = fficlosure;
/* Give the closure the information it needs to determine when
to free itself later */
closure->scope = scope;
return closure;
}
|
