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/*
* AioContext multithreading tests
*
* Copyright Red Hat, Inc. 2016
*
* Authors:
* Paolo Bonzini <pbonzini@redhat.com>
*
* This work is licensed under the terms of the GNU LGPL, version 2 or later.
* See the COPYING.LIB file in the top-level directory.
*/
#include "qemu/osdep.h"
#include <glib.h>
#include "block/aio.h"
#include "qapi/error.h"
#include "qemu/coroutine.h"
#include "qemu/thread.h"
#include "qemu/error-report.h"
#include "iothread.h"
/* AioContext management */
#define NUM_CONTEXTS 5
static IOThread *threads[NUM_CONTEXTS];
static AioContext *ctx[NUM_CONTEXTS];
static __thread int id = -1;
static QemuEvent done_event;
/* Run a function synchronously on a remote iothread. */
typedef struct CtxRunData {
QEMUBHFunc *cb;
void *arg;
} CtxRunData;
static void ctx_run_bh_cb(void *opaque)
{
CtxRunData *data = opaque;
data->cb(data->arg);
qemu_event_set(&done_event);
}
static void ctx_run(int i, QEMUBHFunc *cb, void *opaque)
{
CtxRunData data = {
.cb = cb,
.arg = opaque
};
qemu_event_reset(&done_event);
aio_bh_schedule_oneshot(ctx[i], ctx_run_bh_cb, &data);
qemu_event_wait(&done_event);
}
/* Starting the iothreads. */
static void set_id_cb(void *opaque)
{
int *i = opaque;
id = *i;
}
static void create_aio_contexts(void)
{
int i;
for (i = 0; i < NUM_CONTEXTS; i++) {
threads[i] = iothread_new();
ctx[i] = iothread_get_aio_context(threads[i]);
}
qemu_event_init(&done_event, false);
for (i = 0; i < NUM_CONTEXTS; i++) {
ctx_run(i, set_id_cb, &i);
}
}
/* Stopping the iothreads. */
static void join_aio_contexts(void)
{
int i;
for (i = 0; i < NUM_CONTEXTS; i++) {
aio_context_ref(ctx[i]);
}
for (i = 0; i < NUM_CONTEXTS; i++) {
iothread_join(threads[i]);
}
for (i = 0; i < NUM_CONTEXTS; i++) {
aio_context_unref(ctx[i]);
}
qemu_event_destroy(&done_event);
}
/* Basic test for the stuff above. */
static void test_lifecycle(void)
{
create_aio_contexts();
join_aio_contexts();
}
/* aio_co_schedule test. */
static Coroutine *to_schedule[NUM_CONTEXTS];
static bool now_stopping;
static int count_retry;
static int count_here;
static int count_other;
static bool schedule_next(int n)
{
Coroutine *co;
co = atomic_xchg(&to_schedule[n], NULL);
if (!co) {
atomic_inc(&count_retry);
return false;
}
if (n == id) {
atomic_inc(&count_here);
} else {
atomic_inc(&count_other);
}
aio_co_schedule(ctx[n], co);
return true;
}
static void finish_cb(void *opaque)
{
schedule_next(id);
}
static coroutine_fn void test_multi_co_schedule_entry(void *opaque)
{
g_assert(to_schedule[id] == NULL);
atomic_mb_set(&to_schedule[id], qemu_coroutine_self());
while (!atomic_mb_read(&now_stopping)) {
int n;
n = g_test_rand_int_range(0, NUM_CONTEXTS);
schedule_next(n);
qemu_coroutine_yield();
g_assert(to_schedule[id] == NULL);
atomic_mb_set(&to_schedule[id], qemu_coroutine_self());
}
}
static void test_multi_co_schedule(int seconds)
{
int i;
count_here = count_other = count_retry = 0;
now_stopping = false;
create_aio_contexts();
for (i = 0; i < NUM_CONTEXTS; i++) {
Coroutine *co1 = qemu_coroutine_create(test_multi_co_schedule_entry, NULL);
aio_co_schedule(ctx[i], co1);
}
g_usleep(seconds * 1000000);
atomic_mb_set(&now_stopping, true);
for (i = 0; i < NUM_CONTEXTS; i++) {
ctx_run(i, finish_cb, NULL);
to_schedule[i] = NULL;
}
join_aio_contexts();
g_test_message("scheduled %d, queued %d, retry %d, total %d\n",
count_other, count_here, count_retry,
count_here + count_other + count_retry);
}
static void test_multi_co_schedule_1(void)
{
test_multi_co_schedule(1);
}
static void test_multi_co_schedule_10(void)
{
test_multi_co_schedule(10);
}
/* End of tests. */
int main(int argc, char **argv)
{
init_clocks();
g_test_init(&argc, &argv, NULL);
g_test_add_func("/aio/multi/lifecycle", test_lifecycle);
if (g_test_quick()) {
g_test_add_func("/aio/multi/schedule", test_multi_co_schedule_1);
} else {
g_test_add_func("/aio/multi/schedule", test_multi_co_schedule_10);
}
return g_test_run();
}
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