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); } } }