tests/test-thread-pool.c

   1 #include <glib.h>
   2 #include "qemu-common.h"
   3 #include "block/aio.h"
   4 #include "block/thread-pool.h"
   5 #include "block/block.h"
   6 #include "qemu/timer.h"
   7
   8 static AioContext *ctx;
   9 static ThreadPool *pool;
  10 static int active;
  11
  12 typedef struct {
  13     BlockDriverAIOCB *aiocb;
  14     int n;
  15     int ret;
  16 } WorkerTestData;
  17
  18 static int worker_cb(void *opaque)
  19 {
  20     WorkerTestData *data = opaque;
  21     return atomic_fetch_inc(&data->n);
  22 }
  23
  24 static int long_cb(void *opaque)
  25 {
  26     WorkerTestData *data = opaque;
  27     atomic_inc(&data->n);
  28     g_usleep(2000000);
  29     atomic_inc(&data->n);
  30     return 0;
  31 }
  32
  33 static void done_cb(void *opaque, int ret)
  34 {
  35     WorkerTestData *data = opaque;
  36     g_assert_cmpint(data->ret, ==, -EINPROGRESS);
  37     data->ret = ret;
  38     data->aiocb = NULL;
  39
  40     /* Callbacks are serialized, so no need to use atomic ops.  */
  41     active--;
  42 }
  43
  44 static void test_submit(void)
  45 {
  46     WorkerTestData data = { .n = 0 };
  47     thread_pool_submit(pool, worker_cb, &data);
  48     while (data.n == 0) {
  49         aio_poll(ctx, true);
  50     }
  51     g_assert_cmpint(data.n, ==, 1);
  52 }
  53
  54 static void test_submit_aio(void)
  55 {
  56     WorkerTestData data = { .n = 0, .ret = -EINPROGRESS };
  57     data.aiocb = thread_pool_submit_aio(pool, worker_cb, &data,
  58                                         done_cb, &data);
  59
  60     /* The callbacks are not called until after the first wait.  */
  61     active = 1;
  62     g_assert_cmpint(data.ret, ==, -EINPROGRESS);
  63     while (data.ret == -EINPROGRESS) {
  64         aio_poll(ctx, true);
  65     }
  66     g_assert_cmpint(active, ==, 0);
  67     g_assert_cmpint(data.n, ==, 1);
  68     g_assert_cmpint(data.ret, ==, 0);
  69 }
  70
  71 static void co_test_cb(void *opaque)
  72 {
  73     WorkerTestData *data = opaque;
  74
  75     active = 1;
  76     data->n = 0;
  77     data->ret = -EINPROGRESS;
  78     thread_pool_submit_co(pool, worker_cb, data);
  79
  80     /* The test continues in test_submit_co, after qemu_coroutine_enter... */
  81
  82     g_assert_cmpint(data->n, ==, 1);
  83     data->ret = 0;
  84     active--;
  85
  86     /* The test continues in test_submit_co, after qemu_aio_wait_all... */
  87 }
  88
  89 static void test_submit_co(void)
  90 {
  91     WorkerTestData data;
  92     Coroutine *co = qemu_coroutine_create(co_test_cb);
  93
  94     qemu_coroutine_enter(co, &data);
  95
  96     /* Back here once the worker has started.  */
  97
  98     g_assert_cmpint(active, ==, 1);
  99     g_assert_cmpint(data.ret, ==, -EINPROGRESS);
 100
 101     /* qemu_aio_wait_all will execute the rest of the coroutine.  */
 102
 103     while (data.ret == -EINPROGRESS) {
 104         aio_poll(ctx, true);
 105     }
 106
 107     /* Back here after the coroutine has finished.  */
 108
 109     g_assert_cmpint(active, ==, 0);
 110     g_assert_cmpint(data.ret, ==, 0);
 111 }
 112
 113 static void test_submit_many(void)
 114 {
 115     WorkerTestData data[100];
 116     int i;
 117
 118     /* Start more work items than there will be threads.  */
 119     for (i = 0; i < 100; i++) {
 120         data[i].n = 0;
 121         data[i].ret = -EINPROGRESS;
 122         thread_pool_submit_aio(pool, worker_cb, &data[i], done_cb, &data[i]);
 123     }
 124
 125     active = 100;
 126     while (active > 0) {
 127         aio_poll(ctx, true);
 128     }
 129     for (i = 0; i < 100; i++) {
 130         g_assert_cmpint(data[i].n, ==, 1);
 131         g_assert_cmpint(data[i].ret, ==, 0);
 132     }
 133 }
 134
 135 static void test_cancel(void)
 136 {
 137     WorkerTestData data[100];
 138     int num_canceled;
 139     int i;
 140
 141     /* Start more work items than there will be threads, to ensure
 142      * the pool is full.
 143      */
 144     test_submit_many();
 145
 146     /* Start long running jobs, to ensure we can cancel some.  */
 147     for (i = 0; i < 100; i++) {
 148         data[i].n = 0;
 149         data[i].ret = -EINPROGRESS;
 150         data[i].aiocb = thread_pool_submit_aio(pool, long_cb, &data[i],
 151                                                done_cb, &data[i]);
 152     }
 153
 154     /* Starting the threads may be left to a bottom half.  Let it
 155      * run, but do not waste too much time...
 156      */
 157     active = 100;
 158     aio_notify(ctx);
 159     aio_poll(ctx, false);
 160
 161     /* Wait some time for the threads to start, with some sanity
 162      * testing on the behavior of the scheduler...
 163      */
 164     g_assert_cmpint(active, ==, 100);
 165     g_usleep(1000000);
 166     g_assert_cmpint(active, >, 50);
 167
 168     /* Cancel the jobs that haven't been started yet.  */
 169     num_canceled = 0;
 170     for (i = 0; i < 100; i++) {
 171         if (atomic_cmpxchg(&data[i].n, 0, 3) == 0) {
 172             data[i].ret = -ECANCELED;
 173             bdrv_aio_cancel(data[i].aiocb);
 174             active--;
 175             num_canceled++;
 176         }
 177     }
 178     g_assert_cmpint(active, >, 0);
 179     g_assert_cmpint(num_canceled, <, 100);
 180
 181     /* Canceling the others will be a blocking operation.  */
 182     for (i = 0; i < 100; i++) {
 183         if (data[i].aiocb && data[i].n != 3) {
 184             bdrv_aio_cancel(data[i].aiocb);
 185         }
 186     }
 187
 188     /* Finish execution and execute any remaining callbacks.  */
 189     while (active > 0) {
 190         aio_poll(ctx, true);
 191     }
 192     g_assert_cmpint(active, ==, 0);
 193     for (i = 0; i < 100; i++) {
 194         if (data[i].n == 3) {
 195             g_assert_cmpint(data[i].ret, ==, -ECANCELED);
 196             g_assert(data[i].aiocb != NULL);
 197         } else {
 198             g_assert_cmpint(data[i].n, ==, 2);
 199             g_assert_cmpint(data[i].ret, ==, 0);
 200             g_assert(data[i].aiocb == NULL);
 201         }
 202     }
 203 }
 204
 205 int main(int argc, char **argv)
 206 {
 207     int ret;
 208
 209     init_clocks();
 210
 211     ctx = aio_context_new();
 212     pool = aio_get_thread_pool(ctx);
 213
 214     g_test_init(&argc, &argv, NULL);
 215     g_test_add_func("/thread-pool/submit", test_submit);
 216     g_test_add_func("/thread-pool/submit-aio", test_submit_aio);
 217     g_test_add_func("/thread-pool/submit-co", test_submit_co);
 218     g_test_add_func("/thread-pool/submit-many", test_submit_many);
 219     g_test_add_func("/thread-pool/cancel", test_cancel);
 220
 221     ret = g_test_run();
 222
 223     aio_context_unref(ctx);
 224     return ret;
 225 }