Mercurial > hg > graal-jvmci-8
view src/share/vm/services/gcNotifier.hpp @ 4712:e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
Summary: Replaces calls to os::javaTimeMillis(), which does not (and cannot) guarantee monotonicity, in GC code to an equivalent expression that uses os::javaTimeNanos(). os::javaTimeNanos is guaranteed monotonically non-decreasing if the underlying platform provides a monotonic time source. Changes in OS files are to make use of the newly defined constants in globalDefinitions.hpp.
Reviewed-by: dholmes, ysr
author | johnc |
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date | Mon, 19 Dec 2011 10:02:05 -0800 |
parents | 78542e2b5e35 |
children | 1891640ca63f |
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/* * Copyright (c) 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 * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_SERVICES_GCNOTIFIER_HPP #define SHARE_VM_SERVICES_GCNOTIFIER_HPP #include "memory/allocation.hpp" #include "services/memoryPool.hpp" #include "services/memoryService.hpp" #include "services/memoryManager.hpp" class GCNotificationRequest : public CHeapObj { friend class GCNotifier; GCNotificationRequest *next; jlong timestamp; GCMemoryManager *gcManager; const char *gcAction; const char *gcCause; GCStatInfo *gcStatInfo; public: GCNotificationRequest(jlong ts, GCMemoryManager *manager, const char*action, const char *cause,GCStatInfo *info) { next = NULL; timestamp = ts; gcManager = manager; gcAction = action; gcCause = cause; gcStatInfo = info; } ~GCNotificationRequest() { delete gcStatInfo; } }; class GCNotifier : public AllStatic { friend class ServiceThread; private: static GCNotificationRequest *first_request; static GCNotificationRequest *last_request; static void addRequest(GCNotificationRequest *request); static GCNotificationRequest *getRequest(); public: static void pushNotification(GCMemoryManager *manager, const char *action, const char *cause); static bool has_event(); static void sendNotification(TRAPS); }; #endif // SHARE_VM_SERVICES_GCNOTIFIER_HPP