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coroutine: add test-aio coroutine queue chaining test case

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Check that two coroutines can queue each other repeatedly without
hitting stack exhaustion.

Switch to qemu_init_main_loop() in main() because coroutines use
qemu_get_aio_context() - they don't know about test-aio's ctx variable.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20180322152834.12656-4-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2018-03-22 15:28:34 +00:00
parent c40a254570
commit 35111583aa
1 changed files with 52 additions and 13 deletions
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65
tests/test-aio.c
View file

@ -16,6 +16,8 @@
#include "qemu/timer.h"
#include "qemu/sockets.h"
#include "qemu/error-report.h"
#include "qemu/coroutine.h"
#include "qemu/main-loop.h"
static AioContext *ctx;
@ -827,24 +829,59 @@ static void test_source_timer_schedule(void)
timer_del(&data.timer);
}
/*
* Check that aio_co_enter() can chain many times
*
* Two coroutines should be able to invoke each other via aio_co_enter() many
* times without hitting a limit like stack exhaustion. In other words, the
* calls should be chained instead of nested.
*/
typedef struct {
Coroutine *other;
unsigned i;
unsigned max;
} ChainData;
static void coroutine_fn chain(void *opaque)
{
ChainData *data = opaque;
for (data->i = 0; data->i < data->max; data->i++) {
/* Queue up the other coroutine... */
aio_co_enter(ctx, data->other);
/* ...and give control to it */
qemu_coroutine_yield();
}
}
static void test_queue_chaining(void)
{
/* This number of iterations hit stack exhaustion in the past: */
ChainData data_a = { .max = 25000 };
ChainData data_b = { .max = 25000 };
data_b.other = qemu_coroutine_create(chain, &data_a);
data_a.other = qemu_coroutine_create(chain, &data_b);
qemu_coroutine_enter(data_b.other);
g_assert_cmpint(data_a.i, ==, data_a.max);
g_assert_cmpint(data_b.i, ==, data_b.max - 1);
/* Allow the second coroutine to terminate */
qemu_coroutine_enter(data_a.other);
g_assert_cmpint(data_b.i, ==, data_b.max);
}
/* End of tests. */
int main(int argc, char **argv)
{
Error *local_error = NULL;
GSource *src;
init_clocks(NULL);
ctx = aio_context_new(&local_error);
if (!ctx) {
error_reportf_err(local_error, "Failed to create AIO Context: ");
exit(1);
}
src = aio_get_g_source(ctx);
g_source_attach(src, NULL);
g_source_unref(src);
qemu_init_main_loop(&error_fatal);
ctx = qemu_get_aio_context();
while (g_main_context_iteration(NULL, false));
@ -864,6 +901,8 @@ int main(int argc, char **argv)
g_test_add_func("/aio/external-client", test_aio_external_client);
g_test_add_func("/aio/timer/schedule", test_timer_schedule);
g_test_add_func("/aio/coroutine/queue-chaining", test_queue_chaining);
g_test_add_func("/aio-gsource/flush", test_source_flush);
g_test_add_func("/aio-gsource/bh/schedule", test_source_bh_schedule);
g_test_add_func("/aio-gsource/bh/schedule10", test_source_bh_schedule10);