Signal a blocked futex if the isolate is interrupted; don't busy-wait

src/execution.cc

Index: src/execution.cc
diff --git a/src/execution.cc b/src/execution.cc
index 52cff2f7900eabe3b554724f3525f449f850a6ad..ce5022680cb16afc082ce98c49399acb147aa780 100644
--- a/src/execution.cc
+++ b/src/execution.cc
@@ -413,6 +413,15 @@ void StackGuard::RequestInterrupt(InterruptFlag flag) {
   // Not intercepted.  Set as active interrupt flag.
   thread_local_.interrupt_flags_ |= flag;
   set_interrupt_limits(access);
+
+  // If this isolate is waiting in a futex, notify it to wake up.
+  if (isolate_->futex_wait_list_node()->waiting()) {
+    // Release the execution lock to prevent potential deadlock due to lock
+    // order inversion with the futex lock.
+    ExecutionAccess::Unlock(isolate_);
+    isolate_->futex_wait_list_node()->NotifyWake();
+    ExecutionAccess::Lock(isolate_);
+  }
 }