[+] TaskRunner::PostSignalTask

Instead of chaining waitables, or checking for nested state, or blocks; these tasks are assumed to be thread-local condition variable dispatchers.

Last aurora commit: 87131415

include/v8-platform.h

@@ -149,6 +149,8 @@ class TaskRunner {
 
   TaskRunner(const TaskRunner&) = delete;
   TaskRunner& operator=(const TaskRunner&) = delete;
+  
+  virtual void PostSignalTask(std::unique_ptr<Task> task) = 0;
 };
 
 /**

src/heap/collection-barrier.cc

@@ -116,7 +116,7 @@ void CollectionBarrier::ActivateStackGuardAndPostTask() {
 
   V8::GetCurrentPlatform()
       ->GetForegroundTaskRunner(reinterpret_cast<v8::Isolate*>(isolate))
-      ->PostTask(std::make_unique<BackgroundCollectionInterruptTask>(heap_));
+      ->PostSignalTask(std::make_unique<BackgroundCollectionInterruptTask>(heap_));
 }
 
 void CollectionBarrier::StopTimeToCollectionTimer() {

src/heap/heap.cc

@@ -4114,7 +4114,7 @@ void Heap::MemoryPressureNotification(MemoryPressureLevel level,
       isolate()->stack_guard()->RequestGC();
       auto taskrunner = V8::GetCurrentPlatform()->GetForegroundTaskRunner(
           reinterpret_cast<v8::Isolate*>(isolate()));
-      taskrunner->PostTask(std::make_unique<MemoryPressureInterruptTask>(this));
+      taskrunner->PostSignalTask(std::make_unique<MemoryPressureInterruptTask>(this));
     }
   }
 }

src/heap/safepoint.cc

@@ -115,7 +115,7 @@ void IsolateSafepoint::InitiateGlobalSafepointScopeRaw(
     // wake it up.
     V8::GetCurrentPlatform()
         ->GetForegroundTaskRunner(reinterpret_cast<v8::Isolate*>(isolate()))
-        ->PostTask(std::make_unique<GlobalSafepointInterruptTask>(heap_));
+        ->PostSignalTask(std::make_unique<GlobalSafepointInterruptTask>(heap_));
 
     // Request an interrupt in case of long-running code.
     isolate()->stack_guard()->RequestGlobalSafepoint();