1 /* Copyright The libuv project and contributors. All rights reserved.
2 *
3 * Permission is hereby granted, free of charge, to any person obtaining a copy
4 * of this software and associated documentation files (the "Software"), to
5 * deal in the Software without restriction, including without limitation the
6 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
7 * sell copies of the Software, and to permit persons to whom the Software is
8 * furnished to do so, subject to the following conditions:
9 *
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
12 *
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
18 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
19 * IN THE SOFTWARE.
20 */
21
22 #include "uv.h"
23 #include "task.h"
24
25 #include <string.h>
26
27
28 /*
29 * The idea behind the test is as follows.
30 * Certain handle types are stored in a queue internally.
31 * Extra care should be taken for removal of a handle from the queue while iterating over the queue.
32 * (i.e., QUEUE_REMOVE() called within QUEUE_FOREACH())
33 * This usually happens when someone closes or stops a handle from within its callback.
34 * So we need to check that we haven't screwed the queue on close/stop.
35 * To do so we do the following (for each handle type):
36 * 1. Create and start 3 handles (#0, #1, and #2).
37 *
38 * The queue after the start() calls:
39 * ..=> [queue head] <=> [handle] <=> [handle #1] <=> [handle] <=..
40 *
41 * 2. Trigger handles to fire (for uv_idle_t, uv_prepare_t, and uv_check_t there is nothing to do).
42 *
43 * 3. In the callback for the first-executed handle (#0 or #2 depending on handle type)
44 * stop the handle and the next one (#1).
45 * (for uv_idle_t, uv_prepare_t, and uv_check_t callbacks are executed in the reverse order as they are start()'ed,
46 * so callback for handle #2 will be called first)
47 *
48 * The queue after the stop() calls:
49 * correct foreach "next" |
50 * \/
51 * ..=> [queue head] <==============================> [handle] <=..
52 * [ ] <- [handle] <=> [handle #1] -> [ ]
53 * /\
54 * wrong foreach "next" |
55 *
56 * 4. The callback for handle #1 shouldn't be called because the handle #1 is stopped in the previous step.
57 * However, if QUEUE_REMOVE() is not handled properly within QUEUE_FOREACH(), the callback _will_ be called.
58 */
59
60 static const unsigned first_handle_number_idle = 2;
61 static const unsigned first_handle_number_prepare = 2;
62 static const unsigned first_handle_number_check = 2;
63 #ifdef __linux__
64 static const unsigned first_handle_number_fs_event = 0;
65 #endif
66
67
68 #define DEFINE_GLOBALS_AND_CBS(name, ...) \
69 static uv_##name##_t (name)[3]; \
70 static unsigned name##_cb_calls[3]; \
71 \
72 static void name##2_cb(__VA_ARGS__) { \
73 ASSERT(handle == &(name)[2]); \
74 if (first_handle_number_##name == 2) { \
75 uv_close((uv_handle_t*)&(name)[2], NULL); \
76 uv_close((uv_handle_t*)&(name)[1], NULL); \
77 } \
78 name##_cb_calls[2]++; \
79 } \
80 \
81 static void name##1_cb(__VA_ARGS__) { \
82 ASSERT(handle == &(name)[1]); \
83 ASSERT(0 && "Shouldn't be called" && (&name[0])); \
84 } \
85 \
86 static void name##0_cb(__VA_ARGS__) { \
87 ASSERT(handle == &(name)[0]); \
88 if (first_handle_number_##name == 0) { \
89 uv_close((uv_handle_t*)&(name)[0], NULL); \
90 uv_close((uv_handle_t*)&(name)[1], NULL); \
91 } \
92 name##_cb_calls[0]++; \
93 } \
94 \
95 static const uv_##name##_cb name##_cbs[] = { \
96 name##0_cb, \
97 name##1_cb, \
98 name##2_cb, \
99 };
100
101 #define INIT_AND_START(name, loop) \
102 do { \
103 size_t i; \
104 for (i = 0; i < ARRAY_SIZE(name); i++) { \
105 int r; \
106 r = uv_##name##_init((loop), &(name)[i]); \
107 ASSERT(r == 0); \
108 \
109 r = uv_##name##_start(&(name)[i], name##_cbs[i]); \
110 ASSERT(r == 0); \
111 } \
112 } while (0)
113
114 #define END_ASSERTS(name) \
115 do { \
116 ASSERT(name##_cb_calls[0] == 1); \
117 ASSERT(name##_cb_calls[1] == 0); \
118 ASSERT(name##_cb_calls[2] == 1); \
119 } while (0)
120
121 DEFINE_GLOBALS_AND_CBS(idle, uv_idle_t* handle)
122 DEFINE_GLOBALS_AND_CBS(prepare, uv_prepare_t* handle)
123 DEFINE_GLOBALS_AND_CBS(check, uv_check_t* handle)
124
125 #ifdef __linux__
126 DEFINE_GLOBALS_AND_CBS(fs_event,
127 uv_fs_event_t* handle,
128 const char* filename,
129 int events,
130 int status)
131
132 static const char watched_dir[] = ".";
133 static uv_timer_t timer;
134 static unsigned helper_timer_cb_calls;
135
136
init_and_start_fs_events(uv_loop_t * loop)137 static void init_and_start_fs_events(uv_loop_t* loop) {
138 size_t i;
139 for (i = 0; i < ARRAY_SIZE(fs_event); i++) {
140 int r;
141 r = uv_fs_event_init(loop, &fs_event[i]);
142 ASSERT(r == 0);
143
144 r = uv_fs_event_start(&fs_event[i],
145 (uv_fs_event_cb)fs_event_cbs[i],
146 watched_dir,
147 0);
148 ASSERT(r == 0);
149 }
150 }
151
helper_timer_cb(uv_timer_t * thandle)152 static void helper_timer_cb(uv_timer_t* thandle) {
153 int r;
154 uv_fs_t fs_req;
155
156 /* fire all fs_events */
157 r = uv_fs_utime(thandle->loop, &fs_req, watched_dir, 0, 0, NULL);
158 ASSERT(r == 0);
159 ASSERT(fs_req.result == 0);
160 ASSERT(fs_req.fs_type == UV_FS_UTIME);
161 ASSERT(strcmp(fs_req.path, watched_dir) == 0);
162 uv_fs_req_cleanup(&fs_req);
163
164 helper_timer_cb_calls++;
165 }
166 #endif
167
168
TEST_IMPL(queue_foreach_delete)169 TEST_IMPL(queue_foreach_delete) {
170 uv_loop_t* loop;
171 int r;
172
173 loop = uv_default_loop();
174
175 INIT_AND_START(idle, loop);
176 INIT_AND_START(prepare, loop);
177 INIT_AND_START(check, loop);
178
179 #ifdef __linux__
180 init_and_start_fs_events(loop);
181
182 /* helper timer to trigger async and fs_event callbacks */
183 r = uv_timer_init(loop, &timer);
184 ASSERT(r == 0);
185
186 r = uv_timer_start(&timer, helper_timer_cb, 0, 0);
187 ASSERT(r == 0);
188 #endif
189
190 r = uv_run(loop, UV_RUN_NOWAIT);
191 ASSERT(r == 1);
192
193 END_ASSERTS(idle);
194 END_ASSERTS(prepare);
195 END_ASSERTS(check);
196
197 #ifdef __linux__
198 ASSERT(helper_timer_cb_calls == 1);
199 #endif
200
201 MAKE_VALGRIND_HAPPY();
202
203 return 0;
204 }
205