[common/client] platform: make timing waits portable

client/tests/CMakeLists.txt

@@ -1,5 +1,19 @@
 cmake_minimum_required(VERSION 3.10)
 
+add_executable(common-platform-tests
+  common_platform_test.c
+)
+target_link_libraries(common-platform-tests
+  ${EXE_FLAGS}
+  lg_common
+)
+add_test(NAME common-platform-tests
+  COMMAND common-platform-tests
+)
+set_tests_properties(common-platform-tests PROPERTIES
+  TIMEOUT 10
+)
+
 add_executable(font-tests
   font_test.c
   ../src/font.c

client/tests/common_platform_test.c

@@ -0,0 +1,117 @@
+/**
+ * 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 "test.h"
+
+#include "common/event.h"
+#include "common/thread.h"
+#include "common/time.h"
+
+#include <stdatomic.h>
+#include <stdint.h>
+
+#define TEST_WAIT_NS UINT64_C(1000000000)
+
+struct SignalState
+{
+  LGEvent * event;
+};
+
+struct TimerState
+{
+  LGEvent    * event;
+  atomic_uint  calls;
+};
+
+static int signalThread(void * opaque)
+{
+  const struct SignalState * state = opaque;
+  nsleep(UINT64_C(2000000));
+  CHECK(lgSignalEvent(state->event));
+  return 0;
+}
+
+static bool timerCallback(void * opaque)
+{
+  struct TimerState * state = opaque;
+  const unsigned int calls = atomic_fetch_add_explicit(
+      &state->calls, 1, memory_order_relaxed) + 1;
+  if (calls < 2)
+    return true;
+
+  CHECK(lgSignalEvent(state->event));
+  return false;
+}
+
+static void testEventWaits(void)
+{
+  LGEvent * event = lgCreateEvent(true, 0);
+  CHECK(event);
+
+  const uint64_t timeoutStart = nanotime();
+  CHECK(!lgWaitEventNS(event, UINT64_C(1000000)));
+  CHECK(nanotime() >= timeoutStart);
+
+  const struct SignalState state = { .event = event };
+  LGThread * thread;
+  CHECK(lgCreateThread("eventSignal", signalThread, (void *)&state, &thread));
+  CHECK(lgWaitEventDeadline(event, nanotime() + TEST_WAIT_NS));
+  CHECK(lgJoinThread(thread, NULL));
+
+  CHECK(!lgWaitEvent(event, 0));
+  lgFreeEvent(event);
+}
+
+static void testManualReset(void)
+{
+  LGEvent * event = lgCreateEvent(false, 0);
+  CHECK(event);
+  CHECK(lgSignalEvent(event));
+  CHECK(lgWaitEvent(event, 0));
+  CHECK(lgWaitEvent(event, 0));
+  CHECK(lgResetEvent(event));
+  CHECK(!lgWaitEvent(event, 0));
+  lgFreeEvent(event);
+}
+
+static void testTimer(void)
+{
+  LGEvent * event = lgCreateEvent(true, 0);
+  CHECK(event);
+
+  struct TimerState state = { .event = event };
+  atomic_init(&state.calls, 0);
+
+  LGTimer * timer;
+  CHECK(lgCreateTimer(1, timerCallback, &state, &timer));
+  CHECK(lgWaitEventNS(event, TEST_WAIT_NS));
+  lgTimerDestroy(timer);
+  CHECK(atomic_load_explicit(&state.calls, memory_order_relaxed) == 2);
+  lgFreeEvent(event);
+}
+
+int main(void)
+{
+  lgTimeInit();
+  testEventWaits();
+  testManualReset();
+  testTimer();
+  return 0;
+}