fix for rare launch race condition

.efrocachemap

@@ -4068,26 +4068,26 @@
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   "build/assets/windows/Win32/vcruntime140d.dll": "https://files.ballistica.net/cache/ba1/86/5b/2af4d1e26a1a8073c89acb06e599",
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-  "build/prefab/full/windows_x86_server/release/dist/BallisticaKitHeadless.exe": "https://files.ballistica.net/cache/ba1/b4/56/d1a2a14e4010e9684d966c723383",
+  "build/prefab/full/windows_x86_server/release/dist/BallisticaKitHeadless.exe": "https://files.ballistica.net/cache/ba1/9e/e5/ec1673fdc92998ee8952225b46ec",
   "build/prefab/lib/linux_arm64_gui/debug/libballistica_plus.a": "https://files.ballistica.net/cache/ba1/be/19/b5458933dfc7371d91ecfcd2e06f",
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@@ -4104,14 +4104,14 @@
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+  "build/prefab/lib/windows/Debug_Win32/BallisticaKitGenericPlus.lib": "https://files.ballistica.net/cache/ba1/5d/1c/956723a220dbd69a6fccbdec29df",
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+  "build/prefab/lib/windows/Debug_Win32/BallisticaKitGenericPlus.pdb": "https://files.ballistica.net/cache/ba1/e5/5c/c7737071206b53292cdc954bfde5",
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+  "build/prefab/lib/windows/Debug_Win32/BallisticaKitHeadlessPlus.lib": "https://files.ballistica.net/cache/ba1/50/78/552f6c71715a4939b0ca67468efc",
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CHANGELOG.md

@@ -1,3 +1,9 @@
+### 1.7.22 (build 21154, api 8, 2023-06-28)
+
+- Fixed a very rare race condition when launching threads or sending synchronous
+  cross-thread messages. This was manifesting as one out of several thousand
+  server launches hanging.
+
 ### 1.7.21 (build 21152, api 8, 2023-06-27)
 
 - Fixed an issue where server builds would not always include collision meshes.
@@ -102,7 +108,7 @@
   to the local device.
 - The `ba.Context` class has been reworked a bit and is now `ba.ContextRef` to
   more accurately describe what it actually is. The default constructor
-  (`ba.ContextRef()`) will grab a reference to the current context.  To get a
+  (`ba.ContextRef()`) will grab a reference to the current context. To get a
   context-ref pointing to *no* context, do `ba.ContextRef.empty()`. UI stuff
   will now insist on being run with no context set. To get references to
   Activity/Session contexts, use the context() methods they provide.
@@ -127,7 +133,7 @@
   conversions' may want to keep an eye on this.
 - There is no longer a standalone `ba.playsound()` function. Both ui-sounds (
   acquired via `bauiv1.getsound()` and scene-sounds (acquired via
-  `bascenev1.getsound()`) now have a play() method on them for this purpose.  So
+  `bascenev1.getsound()`) now have a play() method on them for this purpose. So
   just search for any instances of 'playsound' in your code and change stuff
   like `ba.playsound(ba.getsound('error'))` to `bs.getsound('error').play()`.
   Playing sounds in timers is now especially nicer looking; instead of
@@ -303,8 +309,10 @@
   instances of `bastd.ui` with `bauiv1lib` and all other instances of `bastd`
   with `bascenev1lib`. That should mostly do it. Random tip: check out the
   `tools/pcommand mypy_files` as a handy tool to help get your mods updated.
-- (build 21057) Fixed an issue with news items erroring on the main menu (thanks for the heads up Rikko)
+- (build 21057) Fixed an issue with news items erroring on the main menu (thanks
-- (build 21059) Fixed an issue where trying to add a new playlist would error (thanks for the heads up SEBASTIAN2059)
+  for the heads up Rikko)
+- (build 21059) Fixed an issue where trying to add a new playlist would error (
+  thanks for the heads up SEBASTIAN2059)
 - (build 21059) Fixed meta scanning which was coming up empty. Note that games
   must now tag themselves via `ba_meta export bascenev1.GameActivity` instead of
   `ba_meta export game` to be discovered. Warnings will be issued if the old tag
@@ -350,7 +358,8 @@
   Android would not show correctly under the player.
 - (build 21084) Plugin UI now has a categories dropdown for showing only enabled
   or disabled plugins (Thanks vishal332008!)
-- (build 21095) Fixed an issue where certain buttons such as map selection buttons
+- (build 21095) Fixed an issue where certain buttons such as map selection
+  buttons
   would draw incorrectly.
 - (build 21106) Fixed an issue where in-game ping would always display green no
   matter how bad the ping was.
@@ -1235,7 +1244,7 @@
   cause a crash.
 - Fixed a case where an early fatal error could lead to a hung app and no error
   dialog.
-- Added environment variables which can override UI scale for testing.  Set
+- Added environment variables which can override UI scale for testing. Set
   `BA_FORCE_UI_SCALE` to small, medium or large.
 - Added a ba.UIScale enum. The value at ba.app.uiscale replaces the old
   `ba.app.interface_type`, `ba.app.small_ui`, and `ba.app.med_ui` values.

src/assets/ba_data/python/baenv.py

@@ -28,8 +28,8 @@ if TYPE_CHECKING:
 
 # Build number and version of the ballistica binary we expect to be
 # using.
-TARGET_BALLISTICA_BUILD = 21152
+TARGET_BALLISTICA_BUILD = 21154
-TARGET_BALLISTICA_VERSION = '1.7.21'
+TARGET_BALLISTICA_VERSION = '1.7.22'
 
 _g_env_config: EnvConfig | None = None
 g_paths_set_failed = False  # pylint: disable=invalid-name

src/ballistica/base/dynamics/bg/bg_dynamics.cc

@@ -49,9 +49,15 @@ void BGDynamics::Step(const Vector3f& cam_pos, int step_millisecs) {
     TooSlow();
   }
 
-  // If we're slightly behind, just don't send this step;
+  // If we're slightly behind, just don't send this step; the bg dynamics
-  // the bg dynamics will slow down a bit but nothing will disappear this way.
+  // will slow down a bit but nothing will disappear this way, which should
-  if (step_count > 1) return;
+  // be less jarring.
+  //
+  // HMMM; wondering if this should be limited in some way; it might lead to
+  // oddly slow feeling bg sims if things are consistently slow.
+  if (step_count > 1) {
+    return;
+  }
 
   // Pass a newly allocated raw pointer to the bg-dynamics thread; it takes care
   // of disposing it when done.

src/ballistica/base/dynamics/bg/bg_dynamics_server.cc

@@ -2281,7 +2281,7 @@ void BGDynamicsServer::Step(StepData* step_data) {
   // data.
   auto ref(Object::CompleteDeferred(step_data));
 
-  // Keep this in sync with the game thread's.
+  // Keep our quality in sync with the graphics thread's.
   graphics_quality_ = g_base->graphics_server->graphics_quality();
 
   cam_pos_ = step_data->cam_pos;
@@ -2352,6 +2352,13 @@ void BGDynamicsServer::Step(StepData* step_data) {
     step_count_--;
   }
   assert(step_count_ >= 0);
+
+  // Math sanity check.
+  if (step_count_ < 0) {
+    BA_LOG_ONCE(LogLevel::kWarning, "BGDynamics step_count too low ("
+                                        + std::to_string(step_count_)
+                                        + "); should not happen.");
+  }
 }
 
 void BGDynamicsServer::PushStep(StepData* data) {
@@ -2361,6 +2368,13 @@ void BGDynamicsServer::PushStep(StepData* data) {
     step_count_++;
   }
 
+  // Client thread should stop feeding us if we get clogged up.
+  if (step_count_ > 5) {
+    BA_LOG_ONCE(LogLevel::kWarning, "BGDynamics step_count too high ("
+                                        + std::to_string(step_count_)
+                                        + "); should not happen.");
+  }
+
   event_loop()->PushCall([this, data] { Step(data); });
 }
 

src/ballistica/base/logic/logic.h

@@ -72,10 +72,10 @@ class Logic {
   auto display_time_microsecs() { return display_time_microsecs_; }
 
   /// Return current display-time increment in seconds.
-  auto display_time_increment() -> double { return display_time_increment_; }
+  auto display_time_increment() { return display_time_increment_; }
 
   /// Return current display-time increment in microseconds.
-  auto display_time_increment_microsecs() -> double {
+  auto display_time_increment_microsecs() {
     return display_time_increment_microsecs_;
   }
 

src/ballistica/shared/ballistica.cc

@@ -39,8 +39,8 @@ auto main(int argc, char** argv) -> int {
 namespace ballistica {
 
 // These are set automatically via script; don't modify them here.
-const int kEngineBuildNumber = 21152;
+const int kEngineBuildNumber = 21154;
-const char* kEngineVersion = "1.7.21";
+const char* kEngineVersion = "1.7.22";
 
 auto MonolithicMain(const core::CoreConfig& core_config) -> int {
   // This code is meant to be run standalone so won't inherit any

src/ballistica/shared/foundation/event_loop.cc

@@ -19,6 +19,15 @@ EventLoop::EventLoop(EventLoopID identifier_in, ThreadSource source)
     : source_(source), identifier_(identifier_in) {
   switch (source_) {
     case ThreadSource::kCreate: {
+      // IMPORTANT: We grab this lock *before* kicking off our thread, and
+      // we hold it until we're actively listening for the completion
+      // notification. The new thread also grabs the lock before notifying
+      // us, which ensures that we've reached the waiting state before the
+      // notification happens. Otherwise it is possible for them to push out
+      // a notification before we start waiting for it, which means we hang
+      // when we do start listening and nothing comes in.
+      std::unique_lock lock(client_listener_mutex_);
+
       int (*func)(void*);
       void* (*funcp)(void*);
       switch (identifier_) {
@@ -80,7 +89,6 @@ EventLoop::EventLoop(EventLoopID identifier_in, ThreadSource source)
         g_core->LifecycleLog("logic thread bootstrap wait begin");
       }
 
-      std::unique_lock lock(client_listener_mutex_);
       client_listener_cv_.wait(lock, [this] { return bootstrapped_; });
 
       if (identifier_ == EventLoopID::kLogic) {
@@ -392,6 +400,14 @@ auto EventLoop::ThreadMain() -> int {
     // Mark ourself as bootstrapped and signal listeners so
     // anyone waiting for us to spin up can move along.
     bootstrapped_ = true;
+
+    {
+      // Momentarily grab this lock. This ensures that whoever launched us
+      // is now actively waiting for this notification. If we skipped this
+      // it would be possible to notify before they start listening which
+      // leads to a hang.
+      std::unique_lock lock(client_listener_mutex_);
+    }
     client_listener_cv_.notify_all();
 
     // Now just run our loop until we die.
@@ -663,6 +679,13 @@ void EventLoop::RunPendingRunnables() {
     }
   }
   if (do_notify_listeners) {
+    {
+      // Momentarily grab this lock. This ensures that whoever pushed us is
+      // now actively waiting for completion notification. If we skipped
+      // this it would be possible to notify before they start listening
+      // which leads to a hang.
+      std::unique_lock lock(client_listener_mutex_);
+    }
     client_listener_cv_.notify_all();
   }
 }
@@ -714,6 +737,16 @@ void EventLoop::PushRunnable(Runnable* runnable) {
 void EventLoop::PushRunnableSynchronous(Runnable* runnable) {
   bool complete{};
   bool* complete_ptr{&complete};
+
+  // IMPORTANT: We grab this lock *before* pushing our runnable, and we hold
+  // it until we're actively listening for the completion notification. The
+  // receiver also grabs the lock before notifying us, which ensures that
+  // we've reached the waiting state before the notification happens.
+  // Otherwise it is possible for them to push out a notification before we
+  // start waiting for it, which means we hang when we do start listening
+  // and nothing comes in.
+  std::unique_lock lock(client_listener_mutex_);
+
   if (std::this_thread::get_id() == thread_id()) {
     FatalError(
         "PushRunnableSynchronous called from target thread;"
@@ -727,7 +760,6 @@ void EventLoop::PushRunnableSynchronous(Runnable* runnable) {
   }
 
   // Now listen until our completion flag gets set.
-  std::unique_lock lock(client_listener_mutex_);
   client_listener_cv_.wait(lock, [complete_ptr] {
     // Go back to sleep on spurious wakeups
     // (if we're not actually complete yet).

src/ballistica/shared/foundation/macros.h

@@ -90,14 +90,14 @@
   }                                                                      \
   ((void)0)  // (see 'Trailing-semicolon note' at top)
 
-#define BA_LOG_ONCE(lvl, msg)         \
+#define BA_LOG_ONCE(lvl, msg)      \
-  {                                   \
+  {                                \
-    static bool did_log_here = false; \
+    static bool did_log_here{};    \
-    if (!did_log_here) {              \
+    if (!did_log_here) {           \
-      ::ballistica::Log(lvl, msg);    \
+      ::ballistica::Log(lvl, msg); \
-      did_log_here = true;            \
+      did_log_here = true;         \
-    }                                 \
+    }                              \
-  }                                   \
+  }                                \
   ((void)0)  // (see 'Trailing-semicolon note' at top)
 
 #define BA_LOG_PYTHON_TRACE(msg) ::ballistica::MacroLogPythonTrace(g_core, msg)