From 4cbf41ba78f2c9efb75780f0627e4d5ec636aa19 Mon Sep 17 00:00:00 2001
From: dholmes <unknown>
Date: Mon, 21 Mar 2011 22:16:19 -0400
Subject: [PATCH] 6535709: interrupt of wait()ing thread isn't triggerring
 InterruptedException - test intwait3 Summary: only clear the interrupt state
 if we will report that it was set Reviewed-by: dcubed, alanb, phh, coleenp,
 dice

---
 src/os/windows/vm/os_windows.cpp   | 11 ++++++++---
 src/share/vm/runtime/osThread.hpp  |  6 +++---
 src/share/vm/runtime/vmStructs.cpp |  2 +-
 3 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/src/os/windows/vm/os_windows.cpp b/src/os/windows/vm/os_windows.cpp
index 6c050438d..885e90565 100644
--- a/src/os/windows/vm/os_windows.cpp
+++ b/src/os/windows/vm/os_windows.cpp
@@ -3297,9 +3297,14 @@ bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
          "possibility of dangling Thread pointer");
 
   OSThread* osthread = thread->osthread();
-  bool interrupted;
-  interrupted = osthread->interrupted();
-  if (clear_interrupted == true) {
+  bool interrupted = osthread->interrupted();
+  // There is no synchronization between the setting of the interrupt
+  // and it being cleared here. It is critical - see 6535709 - that
+  // we only clear the interrupt state, and reset the interrupt event,
+  // if we are going to report that we were indeed interrupted - else
+  // an interrupt can be "lost", leading to spurious wakeups or lost wakeups
+  // depending on the timing
+  if (interrupted && clear_interrupted) {
     osthread->set_interrupted(false);
     ResetEvent(osthread->interrupt_event());
   } // Otherwise leave the interrupted state alone
diff --git a/src/share/vm/runtime/osThread.hpp b/src/share/vm/runtime/osThread.hpp
index 2cae9cd02..5df645ad8 100644
--- a/src/share/vm/runtime/osThread.hpp
+++ b/src/share/vm/runtime/osThread.hpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -65,7 +65,7 @@ class OSThread: public CHeapObj {
   OSThreadStartFunc _start_proc;  // Thread start routine
   void* _start_parm;              // Thread start routine parameter
   volatile ThreadState _state;    // Thread state *hint*
-  jint _interrupted;              // Thread.isInterrupted state
+  volatile jint _interrupted;     // Thread.isInterrupted state
 
   // Note:  _interrupted must be jint, so that Java intrinsics can access it.
   // The value stored there must be either 0 or 1.  It must be possible
@@ -89,7 +89,7 @@ class OSThread: public CHeapObj {
   void* start_parm() const                          { return _start_parm; }
   void set_start_parm(void* start_parm)             { _start_parm = start_parm; }
 
-  bool interrupted() const                          { return _interrupted != 0; }
+  volatile bool interrupted() const                 { return _interrupted != 0; }
   void set_interrupted(bool z)                      { _interrupted = z ? 1 : 0; }
 
   // Printing
diff --git a/src/share/vm/runtime/vmStructs.cpp b/src/share/vm/runtime/vmStructs.cpp
index 8319877e6..6d777a592 100644
--- a/src/share/vm/runtime/vmStructs.cpp
+++ b/src/share/vm/runtime/vmStructs.cpp
@@ -840,7 +840,7 @@ static inline uint64_t cast_uint64_t(size_t x)
   /* OSThread */                                                                                                                     \
   /************/                                                                                                                     \
                                                                                                                                      \
-  nonstatic_field(OSThread,                    _interrupted,                                  jint)                                  \
+  volatile_nonstatic_field(OSThread,           _interrupted,                                  jint)                                  \
                                                                                                                                      \
   /************************/                                                                                                         \
   /* OopMap and OopMapSet */                                                                                                         \
-- 
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