aboutsummaryrefslogtreecommitdiff
path: root/tests/test-thread-pool.c
blob: ea8e676b0ca00ad2a7a15429fe665f401514893f (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
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
217
218
219
220
221
222
223
224
#include <glib.h>
#include "qemu-common.h"
#include "qemu-aio.h"
#include "thread-pool.h"
#include "block.h"

static int active;

typedef struct {
    BlockDriverAIOCB *aiocb;
    int n;
    int ret;
} WorkerTestData;

static int worker_cb(void *opaque)
{
    WorkerTestData *data = opaque;
    return __sync_fetch_and_add(&data->n, 1);
}

static int long_cb(void *opaque)
{
    WorkerTestData *data = opaque;
    __sync_fetch_and_add(&data->n, 1);
    g_usleep(2000000);
    __sync_fetch_and_add(&data->n, 1);
    return 0;
}

static void done_cb(void *opaque, int ret)
{
    WorkerTestData *data = opaque;
    g_assert_cmpint(data->ret, ==, -EINPROGRESS);
    data->ret = ret;
    data->aiocb = NULL;

    /* Callbacks are serialized, so no need to use atomic ops.  */
    active--;
}

/* A non-blocking poll of the main AIO context (we cannot use aio_poll
 * because we do not know the AioContext).
 */
static void qemu_aio_wait_nonblocking(void)
{
    qemu_notify_event();
    qemu_aio_wait();
}

/* Wait until all aio and bh activity has finished */
static void qemu_aio_wait_all(void)
{
    while (qemu_aio_wait()) {
        /* Do nothing */
    }
}

static void test_submit(void)
{
    WorkerTestData data = { .n = 0 };
    thread_pool_submit(worker_cb, &data);
    qemu_aio_wait_all();
    g_assert_cmpint(data.n, ==, 1);
}

static void test_submit_aio(void)
{
    WorkerTestData data = { .n = 0, .ret = -EINPROGRESS };
    data.aiocb = thread_pool_submit_aio(worker_cb, &data, done_cb, &data);

    /* The callbacks are not called until after the first wait.  */
    active = 1;
    g_assert_cmpint(data.ret, ==, -EINPROGRESS);
    qemu_aio_wait_all();
    g_assert_cmpint(active, ==, 0);
    g_assert_cmpint(data.n, ==, 1);
    g_assert_cmpint(data.ret, ==, 0);
}

static void co_test_cb(void *opaque)
{
    WorkerTestData *data = opaque;

    active = 1;
    data->n = 0;
    data->ret = -EINPROGRESS;
    thread_pool_submit_co(worker_cb, data);

    /* The test continues in test_submit_co, after qemu_coroutine_enter... */

    g_assert_cmpint(data->n, ==, 1);
    data->ret = 0;
    active--;

    /* The test continues in test_submit_co, after qemu_aio_wait_all... */
}

static void test_submit_co(void)
{
    WorkerTestData data;
    Coroutine *co = qemu_coroutine_create(co_test_cb);

    qemu_coroutine_enter(co, &data);

    /* Back here once the worker has started.  */

    g_assert_cmpint(active, ==, 1);
    g_assert_cmpint(data.ret, ==, -EINPROGRESS);

    /* qemu_aio_wait_all will execute the rest of the coroutine.  */

    qemu_aio_wait_all();

    /* Back here after the coroutine has finished.  */

    g_assert_cmpint(active, ==, 0);
    g_assert_cmpint(data.ret, ==, 0);
}

static void test_submit_many(void)
{
    WorkerTestData data[100];
    int i;

    /* Start more work items than there will be threads.  */
    for (i = 0; i < 100; i++) {
        data[i].n = 0;
        data[i].ret = -EINPROGRESS;
        thread_pool_submit_aio(worker_cb, &data[i], done_cb, &data[i]);
    }

    active = 100;
    while (active > 0) {
        qemu_aio_wait();
    }
    for (i = 0; i < 100; i++) {
        g_assert_cmpint(data[i].n, ==, 1);
        g_assert_cmpint(data[i].ret, ==, 0);
    }
}

static void test_cancel(void)
{
    WorkerTestData data[100];
    int num_canceled;
    int i;

    /* Start more work items than there will be threads, to ensure
     * the pool is full.
     */
    test_submit_many();

    /* Start long running jobs, to ensure we can cancel some.  */
    for (i = 0; i < 100; i++) {
        data[i].n = 0;
        data[i].ret = -EINPROGRESS;
        data[i].aiocb = thread_pool_submit_aio(long_cb, &data[i],
                                               done_cb, &data[i]);
    }

    /* Starting the threads may be left to a bottom half.  Let it
     * run, but do not waste too much time...
     */
    active = 100;
    qemu_aio_wait_nonblocking();

    /* Wait some time for the threads to start, with some sanity
     * testing on the behavior of the scheduler...
     */
    g_assert_cmpint(active, ==, 100);
    g_usleep(1000000);
    g_assert_cmpint(active, >, 50);

    /* Cancel the jobs that haven't been started yet.  */
    num_canceled = 0;
    for (i = 0; i < 100; i++) {
        if (__sync_val_compare_and_swap(&data[i].n, 0, 3) == 0) {
            data[i].ret = -ECANCELED;
            bdrv_aio_cancel(data[i].aiocb);
            active--;
            num_canceled++;
        }
    }
    g_assert_cmpint(active, >, 0);
    g_assert_cmpint(num_canceled, <, 100);

    /* Canceling the others will be a blocking operation.  */
    for (i = 0; i < 100; i++) {
        if (data[i].n != 3) {
            bdrv_aio_cancel(data[i].aiocb);
        }
    }

    /* Finish execution and execute any remaining callbacks.  */
    qemu_aio_wait_all();
    g_assert_cmpint(active, ==, 0);
    for (i = 0; i < 100; i++) {
        if (data[i].n == 3) {
            g_assert_cmpint(data[i].ret, ==, -ECANCELED);
            g_assert(data[i].aiocb != NULL);
        } else {
            g_assert_cmpint(data[i].n, ==, 2);
            g_assert_cmpint(data[i].ret, ==, 0);
            g_assert(data[i].aiocb == NULL);
        }
    }
}

int main(int argc, char **argv)
{
    /* These should be removed once each AioContext has its thread pool.
     * The test should create its own AioContext.
     */
    qemu_init_main_loop();
    bdrv_init();

    g_test_init(&argc, &argv, NULL);
    g_test_add_func("/thread-pool/submit", test_submit);
    g_test_add_func("/thread-pool/submit-aio", test_submit_aio);
    g_test_add_func("/thread-pool/submit-co", test_submit_co);
    g_test_add_func("/thread-pool/submit-many", test_submit_many);
    g_test_add_func("/thread-pool/cancel", test_cancel);
    return g_test_run();
}