[common/client] platform: abstract runtime services

client/tests/event_source_test.c

@@ -0,0 +1,129 @@
+/**
+ * Looking Glass
+ * Copyright © 2017-2026 The Looking Glass Authors
+ * https://looking-glass.io
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "event_source.h"
+#include "test.h"
+
+struct Trace
+{
+  unsigned int         notifications;
+  unsigned int         wakeAttempts;
+  unsigned int         wakeFailures;
+  unsigned int         dispatches;
+  bool                 notifyDuringDispatch;
+  LGEventSourceState * state;
+};
+
+static bool notify(void * opaque)
+{
+  struct Trace * trace = (struct Trace *)opaque;
+  ++trace->wakeAttempts;
+  if (trace->wakeFailures)
+  {
+    --trace->wakeFailures;
+    return false;
+  }
+
+  ++trace->notifications;
+  return true;
+}
+
+static void dispatch(void * opaque)
+{
+  struct Trace * trace = (struct Trace *)opaque;
+  ++trace->dispatches;
+  if (trace->notifyDuringDispatch)
+  {
+    trace->notifyDuringDispatch = false;
+    lgEventSourceNotify(trace->state);
+  }
+}
+
+int main(void)
+{
+  struct Trace       trace = { 0 };
+  LGEventSourceState state;
+  LG_DSEventSource   source;
+
+  CHECK(!lgEventSourceInit(NULL, dispatch, &trace));
+  CHECK(!lgEventSourceInit(&state, NULL, &trace));
+  source = lgEventSourceGet(NULL);
+  CHECK(!lgEventSourceValid(&source));
+
+  CHECK(lgEventSourceInit(&state, dispatch, &trace));
+  trace.state = &state;
+  source      = lgEventSourceGet(&state);
+  CHECK(lgEventSourceValid(&source));
+
+  lgEventSourceNotify(&state);
+  CHECK(trace.notifications == 0);
+  CHECK(trace.wakeAttempts == 0);
+  CHECK(source.subscribe(source.opaque, notify, &trace));
+  CHECK(trace.notifications == 1);
+  CHECK(trace.wakeAttempts == 1);
+  CHECK(!source.subscribe(source.opaque, notify, &trace));
+
+  lgEventSourceNotify(&state);
+  CHECK(trace.notifications == 1);
+  CHECK(trace.wakeAttempts == 1);
+  source.dispatch(source.opaque);
+  CHECK(trace.dispatches == 1);
+
+  lgEventSourceNotify(&state);
+  lgEventSourceNotify(&state);
+  CHECK(trace.notifications == 2);
+  CHECK(trace.wakeAttempts == 2);
+  source.dispatch(source.opaque);
+  CHECK(trace.dispatches == 2);
+
+  trace.wakeFailures = 1;
+  lgEventSourceNotify(&state);
+  CHECK(trace.notifications == 2);
+  CHECK(trace.wakeAttempts == 3);
+  lgEventSourceNotify(&state);
+  CHECK(trace.notifications == 3);
+  CHECK(trace.wakeAttempts == 4);
+
+  trace.notifyDuringDispatch = true;
+  source.dispatch(source.opaque);
+  CHECK(trace.dispatches == 3);
+  CHECK(trace.notifications == 4);
+  CHECK(trace.wakeAttempts == 5);
+  source.dispatch(source.opaque);
+  CHECK(trace.dispatches == 4);
+
+  source.unsubscribe(source.opaque);
+  lgEventSourceNotify(&state);
+  CHECK(trace.notifications == 4);
+  CHECK(trace.wakeAttempts == 5);
+  trace.wakeFailures = 1;
+  CHECK(!source.subscribe(source.opaque, notify, &trace));
+  CHECK(trace.notifications == 4);
+  CHECK(trace.wakeAttempts == 6);
+  CHECK(source.subscribe(source.opaque, notify, &trace));
+  CHECK(trace.notifications == 5);
+  CHECK(trace.wakeAttempts == 7);
+  source.dispatch(source.opaque);
+  CHECK(trace.dispatches == 5);
+
+  source.unsubscribe(source.opaque);
+  lgEventSourceFree(&state);
+  return 0;
+}