glib/gio/tests/contexts.c
Ryan Lortie 0de16c98f7 ContextSpecificGroup: some fixups
For all of the effort spent ensuring that this algorithm would be
correctly threadsafe, I messed up the order of operations within a
single thread when porting to the new approach.

Fix that up.

Also: fix some overzealous asserting in the testcases.  Since shutdown
is now lazy, we can never surely say !is_running at any particular point
in time.
2015-03-13 17:39:50 -04:00

427 lines
11 KiB
C

#include "gcontextspecificgroup.c"
#include <gio/gio.h>
#include <stdlib.h>
#include <string.h>
#define N_THREADS 10
static gchar *test_file;
char *test_file_buffer;
gsize test_file_size;
static char async_read_buffer[8192];
static void
read_data (GObject *source, GAsyncResult *result, gpointer loop)
{
GInputStream *in = G_INPUT_STREAM (source);
GError *error = NULL;
gssize nread;
nread = g_input_stream_read_finish (in, result, &error);
g_assert_no_error (error);
g_assert_cmpint (nread, >, 0);
g_assert_cmpint (nread, <=, MIN(sizeof (async_read_buffer), test_file_size));
g_assert (memcmp (async_read_buffer, test_file_buffer, nread) == 0);
g_main_loop_quit (loop);
}
static void
opened_for_read (GObject *source, GAsyncResult *result, gpointer loop)
{
GFile *file = G_FILE (source);
GFileInputStream *in;
GError *error = NULL;
in = g_file_read_finish (file, result, &error);
g_assert_no_error (error);
memset (async_read_buffer, 0, sizeof (async_read_buffer));
g_input_stream_read_async (G_INPUT_STREAM (in),
async_read_buffer, sizeof (async_read_buffer),
G_PRIORITY_DEFAULT, NULL,
read_data, loop);
g_object_unref (in);
}
/* Test 1: Async I/O started in a thread with a thread-default context
* will stick to that thread, and will complete even if the default
* main loop is blocked. (NB: the last part would not be true if we
* were testing GFileMonitor!)
*/
static gboolean idle_start_test1_thread (gpointer loop);
static gpointer test1_thread (gpointer user_data);
static gboolean test1_done;
static GCond test1_cond;
static GMutex test1_mutex;
static void
test_thread_independence (void)
{
GMainLoop *loop;
loop = g_main_loop_new (NULL, FALSE);
g_idle_add (idle_start_test1_thread, loop);
g_main_loop_run (loop);
g_main_loop_unref (loop);
}
static gboolean
idle_start_test1_thread (gpointer loop)
{
gint64 time;
GThread *thread;
gboolean io_completed;
g_mutex_lock (&test1_mutex);
thread = g_thread_new ("test1", test1_thread, NULL);
time = g_get_monotonic_time () + 2 * G_TIME_SPAN_SECOND;
while (!test1_done)
{
io_completed = g_cond_wait_until (&test1_cond, &test1_mutex, time);
g_assert (io_completed);
}
g_thread_join (thread);
g_mutex_unlock (&test1_mutex);
g_main_loop_quit (loop);
return G_SOURCE_REMOVE;
}
static gpointer
test1_thread (gpointer user_data)
{
GMainContext *context;
GMainLoop *loop;
GFile *file;
/* Wait for main thread to be waiting on test1_cond */
g_mutex_lock (&test1_mutex);
context = g_main_context_new ();
g_assert (g_main_context_get_thread_default () == NULL);
g_main_context_push_thread_default (context);
g_assert (g_main_context_get_thread_default () == context);
file = g_file_new_for_path (test_file);
g_assert (g_file_supports_thread_contexts (file));
loop = g_main_loop_new (context, FALSE);
g_file_read_async (file, G_PRIORITY_DEFAULT, NULL,
opened_for_read, loop);
g_object_unref (file);
g_main_loop_run (loop);
g_main_loop_unref (loop);
test1_done = TRUE;
g_cond_signal (&test1_cond);
g_mutex_unlock (&test1_mutex);
g_main_context_pop_thread_default (context);
g_main_context_unref (context);
return NULL;
}
/* Test 2: If we push a thread-default context in the main thread, we
* can run async ops in that context without running the default
* context.
*/
static gboolean test2_fail (gpointer user_data);
static void
test_context_independence (void)
{
GMainContext *context;
GMainLoop *loop;
GFile *file;
guint default_timeout;
GSource *thread_default_timeout;
context = g_main_context_new ();
g_assert (g_main_context_get_thread_default () == NULL);
g_main_context_push_thread_default (context);
g_assert (g_main_context_get_thread_default () == context);
file = g_file_new_for_path (test_file);
g_assert (g_file_supports_thread_contexts (file));
/* Add a timeout to the main loop, to fail immediately if it gets run */
default_timeout = g_timeout_add_full (G_PRIORITY_HIGH, 0,
test2_fail, NULL, NULL);
/* Add a timeout to the alternate loop, to fail if the I/O *doesn't* run */
thread_default_timeout = g_timeout_source_new_seconds (2);
g_source_set_callback (thread_default_timeout, test2_fail, NULL, NULL);
g_source_attach (thread_default_timeout, context);
loop = g_main_loop_new (context, FALSE);
g_file_read_async (file, G_PRIORITY_DEFAULT, NULL,
opened_for_read, loop);
g_object_unref (file);
g_main_loop_run (loop);
g_main_loop_unref (loop);
g_source_remove (default_timeout);
g_source_destroy (thread_default_timeout);
g_source_unref (thread_default_timeout);
g_main_context_pop_thread_default (context);
g_main_context_unref (context);
}
static gboolean
test2_fail (gpointer user_data)
{
g_assert_not_reached ();
return FALSE;
}
typedef struct
{
GObject parent_instance;
GMainContext *context;
} PerThreadThing;
typedef GObjectClass PerThreadThingClass;
static GType per_thread_thing_get_type (void);
G_DEFINE_TYPE (PerThreadThing, per_thread_thing, G_TYPE_OBJECT)
static GContextSpecificGroup group;
static gpointer instances[N_THREADS];
static gint is_running;
static gint current_value;
static gint observed_values[N_THREADS];
static void
start_func (void)
{
g_assert (!is_running);
g_atomic_int_set (&is_running, TRUE);
}
static void
stop_func (void)
{
g_assert (is_running);
g_atomic_int_set (&is_running, FALSE);
}
static void
per_thread_thing_finalize (GObject *object)
{
PerThreadThing *thing = (PerThreadThing *) object;
g_context_specific_group_remove (&group, thing->context, thing, stop_func);
G_OBJECT_CLASS (per_thread_thing_parent_class)->finalize (object);
}
static void
per_thread_thing_init (PerThreadThing *thing)
{
}
static void
per_thread_thing_class_init (PerThreadThingClass *class)
{
class->finalize = per_thread_thing_finalize;
g_signal_new ("changed", per_thread_thing_get_type (), G_SIGNAL_RUN_FIRST, 0,
NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
}
static gpointer
per_thread_thing_get (void)
{
return g_context_specific_group_get (&group, per_thread_thing_get_type (),
G_STRUCT_OFFSET (PerThreadThing, context),
start_func);
}
static gpointer
test_identity_thread (gpointer user_data)
{
guint thread_nr = GPOINTER_TO_UINT (user_data);
GMainContext *my_context;
guint i, j;
my_context = g_main_context_new ();
g_main_context_push_thread_default (my_context);
g_assert (!instances[thread_nr]);
instances[thread_nr] = per_thread_thing_get ();
g_assert (g_atomic_int_get (&is_running));
for (i = 0; i < 100; i++)
{
gpointer instance = per_thread_thing_get ();
for (j = 0; j < N_THREADS; j++)
g_assert ((instance == instances[j]) == (thread_nr == j));
g_assert (g_atomic_int_get (&is_running));
g_thread_yield ();
g_assert (g_atomic_int_get (&is_running));
}
for (i = 0; i < 100; i++)
{
g_object_unref (instances[thread_nr]);
for (j = 0; j < N_THREADS; j++)
g_assert ((instances[thread_nr] == instances[j]) == (thread_nr == j));
g_assert (g_atomic_int_get (&is_running));
g_thread_yield ();
}
/* drop the last ref */
g_object_unref (instances[thread_nr]);
instances[thread_nr] = NULL;
g_main_context_pop_thread_default (my_context);
g_main_context_unref (my_context);
/* at least one thread should see this cleared on exit */
return GUINT_TO_POINTER (!group.requested_state);
}
static void
test_context_specific_identity (void)
{
GThread *threads[N_THREADS];
gboolean exited = FALSE;
guint i;
g_assert (!g_atomic_int_get (&is_running));
for (i = 0; i < N_THREADS; i++)
threads[i] = g_thread_new ("test", test_identity_thread, GUINT_TO_POINTER (i));
for (i = 0; i < N_THREADS; i++)
exited |= GPOINTER_TO_UINT (g_thread_join (threads[i]));
g_assert (exited);
g_assert (!group.requested_state);
}
static void
changed_emitted (PerThreadThing *thing,
gpointer user_data)
{
gint *observed_value = user_data;
g_atomic_int_set (observed_value, g_atomic_int_get (&current_value));
}
static gpointer
test_emit_thread (gpointer user_data)
{
gint *observed_value = user_data;
GMainContext *my_context;
gpointer instance;
my_context = g_main_context_new ();
g_main_context_push_thread_default (my_context);
instance = per_thread_thing_get ();
g_assert (g_atomic_int_get (&is_running));
g_signal_connect (instance, "changed", G_CALLBACK (changed_emitted), observed_value);
/* observe after connection */
g_atomic_int_set (observed_value, g_atomic_int_get (&current_value));
while (g_atomic_int_get (&current_value) != -1)
g_main_context_iteration (my_context, TRUE);
g_object_unref (instance);
g_main_context_pop_thread_default (my_context);
g_main_context_unref (my_context);
/* at least one thread should see this cleared on exit */
return GUINT_TO_POINTER (!group.requested_state);
}
static void
test_context_specific_emit (void)
{
GThread *threads[N_THREADS];
gboolean exited = FALSE;
guint i, n;
for (i = 0; i < N_THREADS; i++)
threads[i] = g_thread_new ("test", test_emit_thread, &observed_values[i]);
/* make changes and ensure that they are observed */
for (n = 0; n < 1000; n++)
{
guint64 expiry;
/* don't burn CPU forever */
expiry = g_get_monotonic_time () + 10 * G_TIME_SPAN_SECOND;
g_atomic_int_set (&current_value, n);
/* wake them to notice */
for (i = 0; i < g_test_rand_int_range (1, 5); i++)
g_context_specific_group_emit (&group, g_signal_lookup ("changed", per_thread_thing_get_type ()));
for (i = 0; i < N_THREADS; i++)
while (g_atomic_int_get (&observed_values[i]) != n)
{
g_thread_yield ();
if (g_get_monotonic_time () > expiry)
g_error ("timed out");
}
}
/* tell them to quit */
g_atomic_int_set (&current_value, -1);
g_context_specific_group_emit (&group, g_signal_lookup ("notify", G_TYPE_OBJECT));
for (i = 0; i < N_THREADS; i++)
exited |= GPOINTER_TO_UINT (g_thread_join (threads[i]));
g_assert (exited);
g_assert (!group.requested_state);
}
int
main (int argc, char **argv)
{
GError *error = NULL;
int ret;
g_test_init (&argc, &argv, NULL);
test_file = g_test_build_filename (G_TEST_DIST, "contexts.c", NULL);
g_file_get_contents (test_file, &test_file_buffer,
&test_file_size, &error);
g_assert_no_error (error);
g_test_add_func ("/gio/contexts/thread-independence", test_thread_independence);
g_test_add_func ("/gio/contexts/context-independence", test_context_independence);
g_test_add_func ("/gio/contexts/context-specific/identity", test_context_specific_identity);
g_test_add_func ("/gio/contexts/context-specific/emit", test_context_specific_emit);
ret = g_test_run();
g_free (test_file_buffer);
g_free (test_file);
return ret;
}