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
   7 static AioContext *ctx;
   8 static ThreadPool *pool;
   9 static int active;
  10
  11 typedef struct {
  12     BlockDriverAIOCB *aiocb;
  13     int n;
  14     int ret;
  15 } WorkerTestData;
  16
  17 static int worker_cb(void *opaque)
  18 {
  19     WorkerTestData *data = opaque;
  20     return __sync_fetch_and_add(&data->n, 1);
  21 }
  22
  23 static int long_cb(void *opaque)
  24 {
  25     WorkerTestData *data = opaque;
  26     __sync_fetch_and_add(&data->n, 1);
  27     g_usleep(2000000);
  28     __sync_fetch_and_add(&data->n, 1);
  29     return 0;
  30 }
  31
  32 static void done_cb(void *opaque, int ret)
  33 {
  34     WorkerTestData *data = opaque;
  35     g_assert_cmpint(data->ret, ==, -EINPROGRESS);
  36     data->ret = ret;
  37     data->aiocb = NULL;
  38
  39     /* Callbacks are serialized, so no need to use atomic ops.  */
  40     active--;
  41 }
  42
  43 /* Wait until all aio and bh activity has finished */
  44 static void qemu_aio_wait_all(void)
  45 {
  46     while (aio_poll(ctx, true)) {
  47         /* Do nothing */
  48     }
  49 }
  50
  51 static void test_submit(void)
  52 {
  53     WorkerTestData data = { .n = 0 };
  54     thread_pool_submit(pool, worker_cb, &data);
  55     qemu_aio_wait_all();
  56     g_assert_cmpint(data.n, ==, 1);
  57 }
  58
  59 static void test_submit_aio(void)
  60 {
  61     WorkerTestData data = { .n = 0, .ret = -EINPROGRESS };
  62     data.aiocb = thread_pool_submit_aio(pool, worker_cb, &data,
  63                                         done_cb, &data);
  64
  65     /* The callbacks are not called until after the first wait.  */
  66     active = 1;
  67     g_assert_cmpint(data.ret, ==, -EINPROGRESS);
  68     qemu_aio_wait_all();
  69     g_assert_cmpint(active, ==, 0);
  70     g_assert_cmpint(data.n, ==, 1);
  71     g_assert_cmpint(data.ret, ==, 0);
  72 }
  73
  74 static void co_test_cb(void *opaque)
  75 {
  76     WorkerTestData *data = opaque;
  77
  78     active = 1;
  79     data->n = 0;
  80     data->ret = -EINPROGRESS;
  81     thread_pool_submit_co(pool, worker_cb, data);
  82
  83     /* The test continues in test_submit_co, after qemu_coroutine_enter... */
  84
  85     g_assert_cmpint(data->n, ==, 1);
  86     data->ret = 0;
  87     active--;
  88
  89     /* The test continues in test_submit_co, after qemu_aio_wait_all... */
  90 }
  91
  92 static void test_submit_co(void)
  93 {
  94     WorkerTestData data;
  95     Coroutine *co = qemu_coroutine_create(co_test_cb);
  96
  97     qemu_coroutine_enter(co, &data);
  98
  99     /* Back here once the worker has started.  */
 100
 101     g_assert_cmpint(active, ==, 1);
 102     g_assert_cmpint(data.ret, ==, -EINPROGRESS);
 103
 104     /* qemu_aio_wait_all will execute the rest of the coroutine.  */
 105
 106     qemu_aio_wait_all();
 107
 108     /* Back here after the coroutine has finished.  */
 109
 110     g_assert_cmpint(active, ==, 0);
 111     g_assert_cmpint(data.ret, ==, 0);
 112 }
 113
 114 static void test_submit_many(void)
 115 {
 116     WorkerTestData data[100];
 117     int i;
 118
 119     /* Start more work items than there will be threads.  */
 120     for (i = 0; i < 100; i++) {
 121         data[i].n = 0;
 122         data[i].ret = -EINPROGRESS;
 123         thread_pool_submit_aio(pool, worker_cb, &data[i], done_cb, &data[i]);
 124     }
 125
 126     active = 100;
 127     while (active > 0) {
 128         aio_poll(ctx, true);
 129     }
 130     for (i = 0; i < 100; i++) {
 131         g_assert_cmpint(data[i].n, ==, 1);
 132         g_assert_cmpint(data[i].ret, ==, 0);
 133     }
 134 }
 135
 136 static void test_cancel(void)
 137 {
 138     WorkerTestData data[100];
 139     int num_canceled;
 140     int i;
 141
 142     /* Start more work items than there will be threads, to ensure
 143      * the pool is full.
 144      */
 145     test_submit_many();
 146
 147     /* Start long running jobs, to ensure we can cancel some.  */
 148     for (i = 0; i < 100; i++) {
 149         data[i].n = 0;
 150         data[i].ret = -EINPROGRESS;
 151         data[i].aiocb = thread_pool_submit_aio(pool, long_cb, &data[i],
 152                                                done_cb, &data[i]);
 153     }
 154
 155     /* Starting the threads may be left to a bottom half.  Let it
 156      * run, but do not waste too much time...
 157      */
 158     active = 100;
 159     aio_notify(ctx);
 160     aio_poll(ctx, false);
 161
 162     /* Wait some time for the threads to start, with some sanity
 163      * testing on the behavior of the scheduler...
 164      */
 165     g_assert_cmpint(active, ==, 100);
 166     g_usleep(1000000);
 167     g_assert_cmpint(active, >, 50);
 168
 169     /* Cancel the jobs that haven't been started yet.  */
 170     num_canceled = 0;
 171     for (i = 0; i < 100; i++) {
 172         if (__sync_val_compare_and_swap(&data[i].n, 0, 3) == 0) {
 173             data[i].ret = -ECANCELED;
 174             bdrv_aio_cancel(data[i].aiocb);
 175             active--;
 176             num_canceled++;
 177         }
 178     }
 179     g_assert_cmpint(active, >, 0);
 180     g_assert_cmpint(num_canceled, <, 100);
 181
 182     /* Canceling the others will be a blocking operation.  */
 183     for (i = 0; i < 100; i++) {
 184         if (data[i].n != 3) {
 185             bdrv_aio_cancel(data[i].aiocb);
 186         }
 187     }
 188
 189     /* Finish execution and execute any remaining callbacks.  */
 190     qemu_aio_wait_all();
 191     g_assert_cmpint(active, ==, 0);
 192     for (i = 0; i < 100; i++) {
 193         if (data[i].n == 3) {
 194             g_assert_cmpint(data[i].ret, ==, -ECANCELED);
 195             g_assert(data[i].aiocb != NULL);
 196         } else {
 197             g_assert_cmpint(data[i].n, ==, 2);
 198             g_assert_cmpint(data[i].ret, ==, 0);
 199             g_assert(data[i].aiocb == NULL);
 200         }
 201     }
 202 }
 203
 204 int main(int argc, char **argv)
 205 {
 206     int ret;
 207
 208     ctx = aio_context_new();
 209     pool = aio_get_thread_pool(ctx);
 210
 211     g_test_init(&argc, &argv, NULL);
 212     g_test_add_func("/thread-pool/submit", test_submit);
 213     g_test_add_func("/thread-pool/submit-aio", test_submit_aio);
 214     g_test_add_func("/thread-pool/submit-co", test_submit_co);
 215     g_test_add_func("/thread-pool/submit-many", test_submit_many);
 216     g_test_add_func("/thread-pool/cancel", test_cancel);
 217
 218     ret = g_test_run();
 219
 220     aio_context_unref(ctx);
 221     return ret;
 222 }