Archipelago » qemu

#include <glib.h>

#include "qemu-common.h"

#include "block/aio.h"

#include "block/thread-pool.h"

#include "block/block.h"

static int active;

typedef struct {

    BlockDriverAIOCB *aiocb;

    int n;

    int ret;

} WorkerTestData;

static int worker_cb(void *opaque)

{

    WorkerTestData *data = opaque;

    return __sync_fetch_and_add(&data->n, 1);

}

static int long_cb(void *opaque)

{

    WorkerTestData *data = opaque;

    __sync_fetch_and_add(&data->n, 1);

    g_usleep(2000000);

    __sync_fetch_and_add(&data->n, 1);

    return 0;

}

static void done_cb(void *opaque, int ret)

{

    WorkerTestData *data = opaque;

    g_assert_cmpint(data->ret, ==, -EINPROGRESS);

    data->ret = ret;

    data->aiocb = NULL;

    /* Callbacks are serialized, so no need to use atomic ops.  */

    active--;

}

/* A non-blocking poll of the main AIO context (we cannot use aio_poll

 * because we do not know the AioContext).

 */

static void qemu_aio_wait_nonblocking(void)

{

    qemu_notify_event();

    qemu_aio_wait();

}

/* Wait until all aio and bh activity has finished */

static void qemu_aio_wait_all(void)

{

    while (qemu_aio_wait()) {

        /* Do nothing */

    }

}

static void test_submit(void)

{

    WorkerTestData data = { .n = 0 };

    thread_pool_submit(worker_cb, &data);

    qemu_aio_wait_all();

    g_assert_cmpint(data.n, ==, 1);

}

static void test_submit_aio(void)

{

    WorkerTestData data = { .n = 0, .ret = -EINPROGRESS };

    data.aiocb = thread_pool_submit_aio(worker_cb, &data, done_cb, &data);

    /* The callbacks are not called until after the first wait.  */

    active = 1;

    g_assert_cmpint(data.ret, ==, -EINPROGRESS);

    qemu_aio_wait_all();

    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(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 qemu_aio_wait_all... */

}

static void test_submit_co(void)

{

    WorkerTestData data;

    Coroutine *co = qemu_coroutine_create(co_test_cb);

    qemu_coroutine_enter(co, &data);

    /* Back here once the worker has started.  */

    g_assert_cmpint(active, ==, 1);

    g_assert_cmpint(data.ret, ==, -EINPROGRESS);

    /* qemu_aio_wait_all will execute the rest of the coroutine.  */

    qemu_aio_wait_all();

    /* 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(worker_cb, &data[i], done_cb, &data[i]);

    }

    active = 100;

    while (active > 0) {

        qemu_aio_wait();

    }

    for (i = 0; i < 100; i++) {

        g_assert_cmpint(data[i].n, ==, 1);

        g_assert_cmpint(data[i].ret, ==, 0);

    }

}

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);

        }

    }

}

int main(int argc, char **argv)

{

    /* These should be removed once each AioContext has its thread pool.

     * The test should create its own AioContext.

     */

    qemu_init_main_loop();

    bdrv_init();

    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);

    return g_test_run();

}