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
206
207
208
209
210
211
212
213
214
215
216
|
/* Copyright (c) 2011-2012 Denis Bilenko. See LICENSE for details. */
#include <stddef.h>
#include "Python.h"
#include "ev.h"
#include "corecext.h"
#include "callbacks.h"
#ifdef Py_PYTHON_H
#if PY_MAJOR_VERSION >= 3
#define PyInt_FromLong PyLong_FromLong
#endif
#ifndef CYTHON_INLINE
#if defined(__clang__)
#define CYTHON_INLINE __inline__ __attribute__ ((__unused__))
#elif defined(__GNUC__)
#define CYTHON_INLINE __inline__
#elif defined(_MSC_VER)
#define CYTHON_INLINE __inline
#elif defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
#define CYTHON_INLINE inline
#else
#define CYTHON_INLINE
#endif
#endif
static CYTHON_INLINE void gevent_check_signals(struct PyGeventLoopObject* loop) {
if (!ev_is_default_loop(loop->_ptr)) {
/* only reporting signals on the default loop */
return;
}
PyErr_CheckSignals();
if (PyErr_Occurred()) gevent_handle_error(loop, Py_None);
}
#define GET_OBJECT(PY_TYPE, EV_PTR, MEMBER) \
((struct PY_TYPE *)(((char *)EV_PTR) - offsetof(struct PY_TYPE, MEMBER)))
#ifdef WITH_THREAD
#define GIL_DECLARE PyGILState_STATE ___save
#define GIL_ENSURE ___save = PyGILState_Ensure();
#define GIL_RELEASE PyGILState_Release(___save);
#else
#define GIL_DECLARE
#define GIL_ENSURE
#define GIL_RELEASE
#endif
static void gevent_stop(PyObject* watcher, struct PyGeventLoopObject* loop) {
PyObject *result, *method;
int error;
error = 1;
method = PyObject_GetAttrString(watcher, "stop");
if (method) {
result = PyObject_Call(method, _empty_tuple, NULL);
if (result) {
Py_DECREF(result);
error = 0;
}
Py_DECREF(method);
}
if (error) {
gevent_handle_error(loop, watcher);
}
}
static void gevent_callback(struct PyGeventLoopObject* loop, PyObject* callback, PyObject* args, PyObject* watcher, void *c_watcher, int revents) {
GIL_DECLARE;
PyObject *result, *py_events;
long length;
py_events = 0;
GIL_ENSURE;
Py_INCREF(loop);
Py_INCREF(callback);
Py_INCREF(args);
Py_INCREF(watcher);
gevent_check_signals(loop);
if (args == Py_None) {
args = _empty_tuple;
}
length = PyTuple_Size(args);
if (length < 0) {
gevent_handle_error(loop, watcher);
goto end;
}
if (length > 0 && PyTuple_GET_ITEM(args, 0) == GEVENT_CORE_EVENTS) {
py_events = PyInt_FromLong(revents);
if (!py_events) {
gevent_handle_error(loop, watcher);
goto end;
}
PyTuple_SET_ITEM(args, 0, py_events);
}
else {
py_events = NULL;
}
result = PyObject_Call(callback, args, NULL);
if (result) {
Py_DECREF(result);
}
else {
gevent_handle_error(loop, watcher);
if (revents & (EV_READ|EV_WRITE)) {
/* io watcher: not stopping it may cause the failing callback to be called repeatedly */
gevent_stop(watcher, loop);
goto end;
}
}
if (!ev_is_active(c_watcher)) {
/* Watcher was stopped, maybe by libev. Let's call stop() to clean up
* 'callback' and 'args' properties, do Py_DECREF() and ev_ref() if necessary.
* BTW, we don't need to check for EV_ERROR, because libev stops the watcher in that case. */
gevent_stop(watcher, loop);
}
end:
if (py_events) {
Py_DECREF(py_events);
PyTuple_SET_ITEM(args, 0, GEVENT_CORE_EVENTS);
}
Py_DECREF(watcher);
Py_DECREF(args);
Py_DECREF(callback);
Py_DECREF(loop);
GIL_RELEASE;
}
void gevent_call(struct PyGeventLoopObject* loop, struct PyGeventCallbackObject* cb) {
/* no need for GIL here because it is only called from run_callbacks which already has GIL */
PyObject *result, *callback, *args;
if (!loop || !cb)
return;
callback = cb->callback;
args = cb->args;
if (!callback || !args)
return;
if (callback == Py_None || args == Py_None)
return;
Py_INCREF(loop);
Py_INCREF(callback);
Py_INCREF(args);
Py_INCREF(Py_None);
Py_DECREF(cb->callback);
cb->callback = Py_None;
result = PyObject_Call(callback, args, NULL);
if (result) {
Py_DECREF(result);
}
else {
gevent_handle_error(loop, (PyObject*)cb);
}
Py_INCREF(Py_None);
Py_DECREF(cb->args);
cb->args = Py_None;
Py_DECREF(callback);
Py_DECREF(args);
Py_DECREF(loop);
}
/*
* PyGeventWatcherObject is the first member of all the structs, so
* it is the same in all of them and they can all safely be cast to
* it. We could also use the *data member of the libev watcher objects.
*/
#undef DEFINE_CALLBACK
#define DEFINE_CALLBACK(WATCHER_LC, WATCHER_TYPE) \
void gevent_callback_##WATCHER_LC(struct ev_loop *_loop, void *c_watcher, int revents) { \
struct PyGeventWatcherObject* watcher = (struct PyGeventWatcherObject*)GET_OBJECT(PyGevent##WATCHER_TYPE##Object, c_watcher, _watcher); \
gevent_callback(watcher->loop, watcher->_callback, watcher->args, (PyObject*)watcher, c_watcher, revents); \
}
DEFINE_CALLBACKS
void gevent_run_callbacks(struct ev_loop *_loop, void *watcher, int revents) {
struct PyGeventLoopObject* loop;
PyObject *result;
GIL_DECLARE;
GIL_ENSURE;
loop = GET_OBJECT(PyGeventLoopObject, watcher, _prepare);
Py_INCREF(loop);
gevent_check_signals(loop);
result = gevent_loop_run_callbacks(loop);
if (result) {
Py_DECREF(result);
}
else {
PyErr_Print();
PyErr_Clear();
}
Py_DECREF(loop);
GIL_RELEASE;
}
/* This is only used on Win32 */
void gevent_periodic_signal_check(struct ev_loop *_loop, void *watcher, int revents) {
GIL_DECLARE;
GIL_ENSURE;
gevent_check_signals(GET_OBJECT(PyGeventLoopObject, watcher, _periodic_signal_checker));
GIL_RELEASE;
}
#endif /* Py_PYTHON_H */
|
