tests/test-thread-pool.c

   1 #include <glib.h>
   2 #include "qemu-common.h"
   3 #include "qemu-aio.h"
   4 #include "thread-pool.h"
   5 #include "block.h"
   6
   7 static int active;
   8
   9 typedef struct {
  10     BlockDriverAIOCB *aiocb;
  11     int n;
  12     int ret;
  13 } WorkerTestData;
  14
  15 static int worker_cb(void *opaque)
  16 {
  17     WorkerTestData *data = opaque;
  18     return __sync_fetch_and_add(&data->n, 1);
  19 }
  20
  21 static int long_cb(void *opaque)
  22 {
  23     WorkerTestData *data = opaque;
  24     __sync_fetch_and_add(&data->n, 1);
  25     g_usleep(2000000);
  26     __sync_fetch_and_add(&data->n, 1);
  27     return 0;
  28 }
  29
  30 static void done_cb(void *opaque, int ret)
  31 {
  32     WorkerTestData *data = opaque;
  33     g_assert_cmpint(data->ret, ==, -EINPROGRESS);
  34     data->ret = ret;
  35     data->aiocb = NULL;
  36
  37     /* Callbacks are serialized, so no need to use atomic ops.  */
  38     active--;
  39 }
  40
  41 /* A non-blocking poll of the main AIO context (we cannot use aio_poll
  42  * because we do not know the AioContext).
  43  */
  44 static void qemu_aio_wait_nonblocking(void)
  45 {
  46     qemu_notify_event();
  47     qemu_aio_wait();
  48 }
  49
  50 static void test_submit(void)
  51 {
  52     WorkerTestData data = { .n = 0 };
  53     thread_pool_submit(worker_cb, &data);
  54     qemu_aio_flush();
  55     g_assert_cmpint(data.n, ==, 1);
  56 }
  57
  58 static void test_submit_aio(void)
  59 {
  60     WorkerTestData data = { .n = 0, .ret = -EINPROGRESS };
  61     data.aiocb = thread_pool_submit_aio(worker_cb, &data, done_cb, &data);
  62
  63     /* The callbacks are not called until after the first wait.  */
  64     active = 1;
  65     g_assert_cmpint(data.ret, ==, -EINPROGRESS);
  66     qemu_aio_flush();
  67     g_assert_cmpint(active, ==, 0);
  68     g_assert_cmpint(data.n, ==, 1);
  69     g_assert_cmpint(data.ret, ==, 0);
  70 }
  71
  72 static void co_test_cb(void *opaque)
  73 {
  74     WorkerTestData *data = opaque;
  75
  76     active = 1;
  77     data->n = 0;
  78     data->ret = -EINPROGRESS;
  79     thread_pool_submit_co(worker_cb, data);
  80
  81     /* The test continues in test_submit_co, after qemu_coroutine_enter... */
  82
  83     g_assert_cmpint(data->n, ==, 1);
  84     data->ret = 0;
  85     active--;
  86
  87     /* The test continues in test_submit_co, after qemu_aio_flush... */
  88 }
  89
  90 static void test_submit_co(void)
  91 {
  92     WorkerTestData data;
  93     Coroutine *co = qemu_coroutine_create(co_test_cb);
  94
  95     qemu_coroutine_enter(co, &data);
  96
  97     /* Back here once the worker has started.  */
  98
  99     g_assert_cmpint(active, ==, 1);
 100     g_assert_cmpint(data.ret, ==, -EINPROGRESS);
 101
 102     /* qemu_aio_flush will execute the rest of the coroutine.  */
 103
 104     qemu_aio_flush();
 105
 106     /* Back here after the coroutine has finished.  */
 107
 108     g_assert_cmpint(active, ==, 0);
 109     g_assert_cmpint(data.ret, ==, 0);
 110 }
 111
 112 static void test_submit_many(void)
 113 {
 114     WorkerTestData data[100];
 115     int i;
 116
 117     /* Start more work items than there will be threads.  */
 118     for (i = 0; i < 100; i++) {
 119         data[i].n = 0;
 120         data[i].ret = -EINPROGRESS;
 121         thread_pool_submit_aio(worker_cb, &data[i], done_cb, &data[i]);
 122     }
 123
 124     active = 100;
 125     while (active > 0) {
 126         qemu_aio_wait();
 127     }
 128     for (i = 0; i < 100; i++) {
 129         g_assert_cmpint(data[i].n, ==, 1);
 130         g_assert_cmpint(data[i].ret, ==, 0);
 131     }
 132 }
 133
 134 static void test_cancel(void)
 135 {
 136     WorkerTestData data[100];
 137     int num_canceled;
 138     int i;
 139
 140     /* Start more work items than there will be threads, to ensure
 141      * the pool is full.
 142      */
 143     test_submit_many();
 144
 145     /* Start long running jobs, to ensure we can cancel some.  */
 146     for (i = 0; i < 100; i++) {
 147         data[i].n = 0;
 148         data[i].ret = -EINPROGRESS;
 149         data[i].aiocb = thread_pool_submit_aio(long_cb, &data[i],
 150                                                done_cb, &data[i]);
 151     }
 152
 153     /* Starting the threads may be left to a bottom half.  Let it
 154      * run, but do not waste too much time...
 155      */
 156     active = 100;
 157     qemu_aio_wait_nonblocking();
 158
 159     /* Wait some time for the threads to start, with some sanity
 160      * testing on the behavior of the scheduler...
 161      */
 162     g_assert_cmpint(active, ==, 100);
 163     g_usleep(1000000);
 164     g_assert_cmpint(active, >, 50);
 165
 166     /* Cancel the jobs that haven't been started yet.  */
 167     num_canceled = 0;
 168     for (i = 0; i < 100; i++) {
 169         if (__sync_val_compare_and_swap(&data[i].n, 0, 3) == 0) {
 170             data[i].ret = -ECANCELED;
 171             bdrv_aio_cancel(data[i].aiocb);
 172             active--;
 173             num_canceled++;
 174         }
 175     }
 176     g_assert_cmpint(active, >, 0);
 177     g_assert_cmpint(num_canceled, <, 100);
 178
 179     /* Canceling the others will be a blocking operation.  */
 180     for (i = 0; i < 100; i++) {
 181         if (data[i].n != 3) {
 182             bdrv_aio_cancel(data[i].aiocb);
 183         }
 184     }
 185
 186     /* Finish execution and execute any remaining callbacks.  */
 187     qemu_aio_flush();
 188     g_assert_cmpint(active, ==, 0);
 189     for (i = 0; i < 100; i++) {
 190         if (data[i].n == 3) {
 191             g_assert_cmpint(data[i].ret, ==, -ECANCELED);
 192             g_assert(data[i].aiocb != NULL);
 193         } else {
 194             g_assert_cmpint(data[i].n, ==, 2);
 195             g_assert_cmpint(data[i].ret, ==, 0);
 196             g_assert(data[i].aiocb == NULL);
 197         }
 198     }
 199 }
 200
 201 int main(int argc, char **argv)
 202 {
 203     /* These should be removed once each AioContext has its thread pool.
 204      * The test should create its own AioContext.
 205      */
 206     qemu_init_main_loop();
 207     bdrv_init();
 208
 209     g_test_init(&argc, &argv, NULL);
 210     g_test_add_func("/thread-pool/submit", test_submit);
 211     g_test_add_func("/thread-pool/submit-aio", test_submit_aio);
 212     g_test_add_func("/thread-pool/submit-co", test_submit_co);
 213     g_test_add_func("/thread-pool/submit-many", test_submit_many);
 214     g_test_add_func("/thread-pool/cancel", test_cancel);
 215     return g_test_run();
 216 }