void
ec_lock_reader_lock (ECLock *self)
{
g_static_rw_lock_reader_lock (self->free_lock);
{
g_assert (!self->destroyed);
g_assert (!have_reader_lock_unprotected (self));
g_mutex_lock (self->state_mutex);
while ( self->state == EC_LOCK_STATE_WRITER_LOCKED ) {
g_cond_wait (self->state_cv, self->state_mutex);
}
{
// To make sure we haven't screwed up this class, we operate an
// actual reader/writer lock. It had better work...
gboolean lock_result = g_static_rw_lock_reader_trylock (self->lock);
g_assert (lock_result == TRUE);
g_assert (self->writer == NULL);
g_hash_table_insert (self->readers, g_thread_self (), NULL);
maybe_trace (self, "obtained reader lock");
self->state = EC_LOCK_STATE_READER_LOCKED;
g_cond_broadcast (self->state_cv);
}
g_mutex_unlock (self->state_mutex);
}
g_static_rw_lock_reader_unlock (self->free_lock);
}
static gpointer
test_g_static_rw_lock_thread (gpointer data)
{
while (test_g_static_rw_lock_run)
{
if (g_random_double() > .2) /* I'm a reader */
{
if (g_random_double() > .2) /* I'll block */
g_static_rw_lock_reader_lock (&test_g_static_rw_lock_lock);
else /* I'll only try */
if (!g_static_rw_lock_reader_trylock (&test_g_static_rw_lock_lock))
continue;
G_LOCK (test_g_static_rw_lock_state);
g_assert (test_g_static_rw_lock_state >= 0);
test_g_static_rw_lock_state++;
G_UNLOCK (test_g_static_rw_lock_state);
g_usleep (g_random_int_range (20,1000));
G_LOCK (test_g_static_rw_lock_state);
test_g_static_rw_lock_state--;
G_UNLOCK (test_g_static_rw_lock_state);
g_static_rw_lock_reader_unlock (&test_g_static_rw_lock_lock);
}
else /* I'm a writer */
{
if (g_random_double() > .2) /* I'll block */
g_static_rw_lock_writer_lock (&test_g_static_rw_lock_lock);
else /* I'll only try */
if (!g_static_rw_lock_writer_trylock (&test_g_static_rw_lock_lock))
continue;
G_LOCK (test_g_static_rw_lock_state);
g_assert (test_g_static_rw_lock_state == 0);
test_g_static_rw_lock_state = -1;
G_UNLOCK (test_g_static_rw_lock_state);
g_usleep (g_random_int_range (20,1000));
G_LOCK (test_g_static_rw_lock_state);
test_g_static_rw_lock_state = 0;
G_UNLOCK (test_g_static_rw_lock_state);
g_static_rw_lock_writer_unlock (&test_g_static_rw_lock_lock);
}
}
return NULL;
}
