• file
• revisions
• annotate
• diff
• comparison
• raw

src/share/vm/memory/gcLocker.inline.hpp@d903bf750e9f (annotated)

src/share/vm/memory/gcLocker.inline.hpp

Wed, 18 Jan 2012 09:50:16 -0800

author

johnc

date

Wed, 18 Jan 2012 09:50:16 -0800

changeset 3538

d903bf750e9f

parent 3494

1a2723f7ad8e

child 3576

ad3b47344802

permissions

-rw-r--r--

7129514: time warp warnings after 7117303
Summary: Replace calls to os::javaTimeMillis() that are used to update the milliseconds since the last GC to an equivalent that uses a monotonically non-decreasing time source.
Reviewed-by: ysr, jmasa

duke@435	1	/*
never@3494	2	* Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#ifndef SHARE_VM_MEMORY_GCLOCKER_INLINE_HPP
stefank@2314	26	#define SHARE_VM_MEMORY_GCLOCKER_INLINE_HPP
stefank@2314	27
stefank@2314	28	#include "memory/gcLocker.hpp"
stefank@2314	29
duke@435	30	inline bool GC_locker::is_active() {
never@3494	31	assert(_needs_gc || SafepointSynchronize::is_at_safepoint(), "only read at safepoint");
never@3494	32	verify_critical_count();
duke@435	33	return _lock_count > 0 || _jni_lock_count > 0;
duke@435	34	}
duke@435	35
duke@435	36	inline void GC_locker::lock() {
duke@435	37	// cast away volatile
duke@435	38	Atomic::inc(&_lock_count);
duke@435	39	CHECK_UNHANDLED_OOPS_ONLY(
duke@435	40	if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count++; })
duke@435	41	assert(Universe::heap() == NULL ||
duke@435	42	!Universe::heap()->is_gc_active(), "locking failed");
duke@435	43	}
duke@435	44
duke@435	45	inline void GC_locker::unlock() {
duke@435	46	// cast away volatile
duke@435	47	Atomic::dec(&_lock_count);
duke@435	48	CHECK_UNHANDLED_OOPS_ONLY(
duke@435	49	if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count--; })
duke@435	50	}
duke@435	51
duke@435	52	inline void GC_locker::lock_critical(JavaThread* thread) {
duke@435	53	if (!thread->in_critical()) {
never@3494	54	if (needs_gc()) {
never@3494	55	// jni_lock call calls enter_critical under the lock so that the
never@3494	56	// global lock count and per thread count are in agreement.
never@3494	57	jni_lock(thread);
never@3494	58	return;
duke@435	59	}
never@3494	60	increment_debug_jni_lock_count();
duke@435	61	}
duke@435	62	thread->enter_critical();
duke@435	63	}
duke@435	64
duke@435	65	inline void GC_locker::unlock_critical(JavaThread* thread) {
never@3494	66	if (thread->in_last_critical()) {
never@3494	67	if (needs_gc()) {
never@3494	68	// jni_unlock call calls exit_critical under the lock so that
never@3494	69	// the global lock count and per thread count are in agreement.
never@3494	70	jni_unlock(thread);
never@3494	71	return;
never@3494	72	}
never@3494	73	decrement_debug_jni_lock_count();
never@3494	74	}
duke@435	75	thread->exit_critical();
duke@435	76	}
stefank@2314	77
stefank@2314	78	#endif // SHARE_VM_MEMORY_GCLOCKER_INLINE_HPP