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test-coroutine: Add rwlock upgrade test 

Test that rwlock upgrade is fair, and that readers go back to sleep if
a writer is in line.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20210325112941.365238-6-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Paolo Bonzini 2021-03-25 12:29:40 +01:00 committed by Stefan Hajnoczi
parent 050de36b13
commit 25bc2daed0
1 changed files with 62 additions and 0 deletions
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62
tests/unit/test-coroutine.c
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@ -264,6 +264,67 @@ static void test_co_mutex_lockable(void)
g_assert(QEMU_MAKE_LOCKABLE(null_pointer) == NULL);
}
static CoRwlock rwlock;
/* Test that readers are properly sent back to the queue when upgrading,
* even if they are the sole readers. The test scenario is as follows:
*
*
* | c1 | c2 |
* |--------------+------------+
* | rdlock | |
* | yield | |
* | | wrlock |
* | | <queued> |
* | upgrade | |
* | <queued> | <dequeued> |
* | | unlock |
* | <dequeued> | |
* | unlock | |
*/
static void coroutine_fn rwlock_yield_upgrade(void *opaque)
{
qemu_co_rwlock_rdlock(&rwlock);
qemu_coroutine_yield();
qemu_co_rwlock_upgrade(&rwlock);
qemu_co_rwlock_unlock(&rwlock);
*(bool *)opaque = true;
}
static void coroutine_fn rwlock_wrlock_yield(void *opaque)
{
qemu_co_rwlock_wrlock(&rwlock);
qemu_coroutine_yield();
qemu_co_rwlock_unlock(&rwlock);
*(bool *)opaque = true;
}
static void test_co_rwlock_upgrade(void)
{
bool c1_done = false;
bool c2_done = false;
Coroutine *c1, *c2;
qemu_co_rwlock_init(&rwlock);
c1 = qemu_coroutine_create(rwlock_yield_upgrade, &c1_done);
c2 = qemu_coroutine_create(rwlock_wrlock_yield, &c2_done);
qemu_coroutine_enter(c1);
qemu_coroutine_enter(c2);
/* c1 now should go to sleep. */
qemu_coroutine_enter(c1);
g_assert(!c1_done);
qemu_coroutine_enter(c2);
g_assert(c1_done);
g_assert(c2_done);
}
/*
* Check that creation, enter, and return work
*/
@ -501,6 +562,7 @@ int main(int argc, char **argv)
g_test_add_func("/basic/order", test_order);
g_test_add_func("/locking/co-mutex", test_co_mutex);
g_test_add_func("/locking/co-mutex/lockable", test_co_mutex_lockable);
g_test_add_func("/locking/co-rwlock/upgrade", test_co_rwlock_upgrade);
if (g_test_perf()) {
g_test_add_func("/perf/lifecycle", perf_lifecycle);
g_test_add_func("/perf/nesting", perf_nesting);