qemu

test-thread-pool.c (6521B)

---

 #include "qemu/osdep.h"
 #include "block/aio.h"
 #include "block/thread-pool.h"
 #include "block/block.h"
 #include "qapi/error.h"
 #include "qemu/timer.h"
 #include "qemu/error-report.h"
 #include "qemu/main-loop.h"
 
 static AioContext *ctx;
 static ThreadPool *pool;
 static int active;
 
 typedef struct {
     BlockAIOCB *aiocb;
     int n;
     int ret;
 } WorkerTestData;
 
 static int worker_cb(void *opaque)
 {
     WorkerTestData *data = opaque;
     return qatomic_fetch_inc(&data->n);
 }
 
 static int long_cb(void *opaque)
 {
     WorkerTestData *data = opaque;
     if (qatomic_cmpxchg(&data->n, 0, 1) == 0) {
         g_usleep(2000000);
         qatomic_or(&data->n, 2);
     }
     return 0;
 }
 
 static void done_cb(void *opaque, int ret)
 {
     WorkerTestData *data = opaque;
     g_assert(data->ret == -EINPROGRESS || data->ret == -ECANCELED);
     data->ret = ret;
     data->aiocb = NULL;
 
     /* Callbacks are serialized, so no need to use atomic ops.  */
     active--;
 }
 
 static void test_submit(void)
 {
     WorkerTestData data = { .n = 0 };
     thread_pool_submit(pool, worker_cb, &data);
     while (data.n == 0) {
         aio_poll(ctx, true);
     }
     g_assert_cmpint(data.n, ==, 1);
 }
 
 static void test_submit_aio(void)
 {
     WorkerTestData data = { .n = 0, .ret = -EINPROGRESS };
     data.aiocb = thread_pool_submit_aio(pool, worker_cb, &data,
                                         done_cb, &data);
 
     /* The callbacks are not called until after the first wait.  */
     active = 1;
     g_assert_cmpint(data.ret, ==, -EINPROGRESS);
     while (data.ret == -EINPROGRESS) {
         aio_poll(ctx, true);
     }
     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(pool, 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 aio_poll... */
 }
 
 static void test_submit_co(void)
 {
     WorkerTestData data;
     Coroutine *co = qemu_coroutine_create(co_test_cb, &data);
 
     qemu_coroutine_enter(co);
 
     /* Back here once the worker has started.  */
 
     g_assert_cmpint(active, ==, 1);
     g_assert_cmpint(data.ret, ==, -EINPROGRESS);
 
     /* aio_poll will execute the rest of the coroutine.  */
 
     while (data.ret == -EINPROGRESS) {
         aio_poll(ctx, true);
     }
 
     /* 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(pool, worker_cb, &data[i], done_cb, &data[i]);
     }
 
     active = 100;
     while (active > 0) {
         aio_poll(ctx, true);
     }
     for (i = 0; i < 100; i++) {
         g_assert_cmpint(data[i].n, ==, 1);
         g_assert_cmpint(data[i].ret, ==, 0);
     }
 }
 
 static void do_test_cancel(bool sync)
 {
     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(pool, 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;
     aio_notify(ctx);
     aio_poll(ctx, false);
 
     /* 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 (qatomic_cmpxchg(&data[i].n, 0, 4) == 0) {
             data[i].ret = -ECANCELED;
             if (sync) {
                 bdrv_aio_cancel(data[i].aiocb);
             } else {
                 bdrv_aio_cancel_async(data[i].aiocb);
             }
             num_canceled++;
         }
     }
     g_assert_cmpint(active, >, 0);
     g_assert_cmpint(num_canceled, <, 100);
 
     for (i = 0; i < 100; i++) {
         if (data[i].aiocb && qatomic_read(&data[i].n) < 4) {
             if (sync) {
                 /* Canceling the others will be a blocking operation.  */
                 bdrv_aio_cancel(data[i].aiocb);
             } else {
                 bdrv_aio_cancel_async(data[i].aiocb);
             }
         }
     }
 
     /* Finish execution and execute any remaining callbacks.  */
     while (active > 0) {
         aio_poll(ctx, true);
     }
     g_assert_cmpint(active, ==, 0);
     for (i = 0; i < 100; i++) {
         g_assert(data[i].aiocb == NULL);
         switch (data[i].n) {
         case 0:
             fprintf(stderr, "Callback not canceled but never started?\n");
             abort();
         case 3:
             /* Couldn't be canceled asynchronously, must have completed.  */
             g_assert_cmpint(data[i].ret, ==, 0);
             break;
         case 4:
             /* Could be canceled asynchronously, never started.  */
             g_assert_cmpint(data[i].ret, ==, -ECANCELED);
             break;
         default:
             fprintf(stderr, "Callback aborted while running?\n");
             abort();
         }
     }
 }
 
 static void test_cancel(void)
 {
     do_test_cancel(true);
 }
 
 static void test_cancel_async(void)
 {
     do_test_cancel(false);
 }
 
 int main(int argc, char **argv)
 {
     qemu_init_main_loop(&error_abort);
     ctx = qemu_get_current_aio_context();
     pool = aio_get_thread_pool(ctx);
 
     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);
     g_test_add_func("/thread-pool/cancel-async", test_cancel_async);
 
     return g_test_run();
 }