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src/hotspot/share/runtime/objectMonitor.cpp
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rev 55977 : imported patch 8229212.cr0
rev 55978 : 8229212: clear up CHECK_OWNER confusion in objectMonitor.cpp
Reviewed-by: dholmes
@@ -1141,35 +1141,38 @@
guarantee(_recursions == 0, "reenter recursion");
_recursions = recursions;
return;
}
-
-// -----------------------------------------------------------------------------
-// A macro is used below because there may already be a pending
-// exception which should not abort the execution of the routines
-// which use this (which is why we don't put this into check_slow and
-// call it with a CHECK argument).
-
+// Checks that the current THREAD owns this monitor and causes an
+// immediate return if it doesn't. We don't use the CHECK macro
+// because we want the IMSE to be the only exception that is thrown
+// from the call site when false is returned. Any other pending
+// exception is ignored.
#define CHECK_OWNER() \
do { \
- if (THREAD != _owner) { \
- if (THREAD->is_lock_owned((address) _owner)) { \
- _owner = THREAD; /* Convert from basiclock addr to Thread addr */ \
- _recursions = 0; \
- } else { \
- THROW(vmSymbols::java_lang_IllegalMonitorStateException()); \
- } \
+ if (!check_owner(THREAD)) { \
+ assert(HAS_PENDING_EXCEPTION, "expected a pending IMSE here."); \
+ return; \
} \
} while (false)
-// check_slow() is a misnomer. It's called to simply to throw an IMSX exception.
-// TODO-FIXME: remove check_slow() -- it's likely dead.
-
-void ObjectMonitor::check_slow(TRAPS) {
- assert(THREAD != _owner && !THREAD->is_lock_owned((address) _owner), "must not be owner");
- THROW_MSG(vmSymbols::java_lang_IllegalMonitorStateException(), "current thread not owner");
+// Returns true if the specified thread owns the ObjectMonitor.
+// Otherwise returns false and throws IllegalMonitorStateException
+// (IMSE). If there is a pending exception and the specified thread
+// is not the owner, that exception will be replaced by the IMSE.
+bool ObjectMonitor::check_owner(Thread* THREAD) {
+ if (_owner == THREAD) {
+ return true;
+ }
+ if (THREAD->is_lock_owned((address)_owner)) {
+ _owner = THREAD; // convert from BasicLock addr to Thread addr
+ _recursions = 0;
+ return true;
+ }
+ THROW_MSG_(vmSymbols::java_lang_IllegalMonitorStateException(),
+ "current thread is not owner", false);
}
static void post_monitor_wait_event(EventJavaMonitorWait* event,
ObjectMonitor* monitor,
jlong notifier_tid,
@@ -1195,12 +1198,11 @@
assert(Self->is_Java_thread(), "Must be Java thread!");
JavaThread *jt = (JavaThread *)THREAD;
assert(InitDone, "Unexpectedly not initialized");
- // Throw IMSX or IEX.
- CHECK_OWNER();
+ CHECK_OWNER(); // Throws IMSE if not owner.
EventJavaMonitorWait event;
// check for a pending interrupt
if (interruptible && Thread::is_interrupted(Self, true) && !HAS_PENDING_EXCEPTION) {
@@ -1475,11 +1477,11 @@
// When the "minimum wait" is set to a small non-zero timeout value
// and the program does not hang whereas it did absent "minimum wait",
// that suggests a lost wakeup bug.
void ObjectMonitor::notify(TRAPS) {
- CHECK_OWNER();
+ CHECK_OWNER(); // Throws IMSE if not owner.
if (_WaitSet == NULL) {
return;
}
DTRACE_MONITOR_PROBE(notify, this, object(), THREAD);
INotify(THREAD);
@@ -1493,11 +1495,11 @@
// that in prepend-mode we invert the order of the waiters. Let's say that the
// waitset is "ABCD" and the EntryList is "XYZ". After a notifyAll() in prepend
// mode the waitset will be empty and the EntryList will be "DCBAXYZ".
void ObjectMonitor::notifyAll(TRAPS) {
- CHECK_OWNER();
+ CHECK_OWNER(); // Throws IMSE if not owner.
if (_WaitSet == NULL) {
return;
}
DTRACE_MONITOR_PROBE(notifyAll, this, object(), THREAD);
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