Per Lidén | f1edf66 | 2014-04-11 12:29:24 +0200 | [diff] [blame] | 1 | /* |
Joseph Provino | f979b6f | 2015-05-08 09:52:51 -0400 | [diff] [blame] | 2 | * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved. |
Per Lidén | f1edf66 | 2014-04-11 12:29:24 +0200 | [diff] [blame] | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| 13 | * accompanied this code). |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License version |
| 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | * |
| 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| 20 | * or visit www.oracle.com if you need additional information or have any |
| 21 | * questions. |
| 22 | * |
| 23 | */ |
| 24 | |
| 25 | #include "precompiled.hpp" |
Per Lidén | 4dc240f | 2015-05-13 15:16:06 +0200 | [diff] [blame] | 26 | #include "gc/g1/suspendibleThreadSet.hpp" |
Per Lidén | f1edf66 | 2014-04-11 12:29:24 +0200 | [diff] [blame] | 27 | #include "runtime/mutexLocker.hpp" |
| 28 | #include "runtime/thread.inline.hpp" |
| 29 | |
| 30 | uint SuspendibleThreadSet::_nthreads = 0; |
| 31 | uint SuspendibleThreadSet::_nthreads_stopped = 0; |
| 32 | bool SuspendibleThreadSet::_suspend_all = false; |
| 33 | double SuspendibleThreadSet::_suspend_all_start = 0.0; |
| 34 | |
| 35 | void SuspendibleThreadSet::join() { |
Joseph Provino | f979b6f | 2015-05-08 09:52:51 -0400 | [diff] [blame] | 36 | assert(!Thread::current()->is_suspendible_thread(), "Thread already joined"); |
Per Lidén | f1edf66 | 2014-04-11 12:29:24 +0200 | [diff] [blame] | 37 | MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag); |
| 38 | while (_suspend_all) { |
| 39 | ml.wait(Mutex::_no_safepoint_check_flag); |
| 40 | } |
| 41 | _nthreads++; |
Joseph Provino | f979b6f | 2015-05-08 09:52:51 -0400 | [diff] [blame] | 42 | DEBUG_ONLY(Thread::current()->set_suspendible_thread();) |
Per Lidén | f1edf66 | 2014-04-11 12:29:24 +0200 | [diff] [blame] | 43 | } |
| 44 | |
| 45 | void SuspendibleThreadSet::leave() { |
Joseph Provino | f979b6f | 2015-05-08 09:52:51 -0400 | [diff] [blame] | 46 | assert(Thread::current()->is_suspendible_thread(), "Thread not joined"); |
Per Lidén | f1edf66 | 2014-04-11 12:29:24 +0200 | [diff] [blame] | 47 | MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag); |
| 48 | assert(_nthreads > 0, "Invalid"); |
Joseph Provino | f979b6f | 2015-05-08 09:52:51 -0400 | [diff] [blame] | 49 | DEBUG_ONLY(Thread::current()->clear_suspendible_thread();) |
Per Lidén | f1edf66 | 2014-04-11 12:29:24 +0200 | [diff] [blame] | 50 | _nthreads--; |
| 51 | if (_suspend_all) { |
| 52 | ml.notify_all(); |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | void SuspendibleThreadSet::yield() { |
Joseph Provino | f979b6f | 2015-05-08 09:52:51 -0400 | [diff] [blame] | 57 | assert(Thread::current()->is_suspendible_thread(), "Must have joined"); |
Per Lidén | f1edf66 | 2014-04-11 12:29:24 +0200 | [diff] [blame] | 58 | if (_suspend_all) { |
| 59 | MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag); |
| 60 | if (_suspend_all) { |
| 61 | _nthreads_stopped++; |
| 62 | if (_nthreads_stopped == _nthreads) { |
| 63 | if (ConcGCYieldTimeout > 0) { |
| 64 | double now = os::elapsedTime(); |
| 65 | guarantee((now - _suspend_all_start) * 1000.0 < (double)ConcGCYieldTimeout, "Long delay"); |
| 66 | } |
| 67 | } |
| 68 | ml.notify_all(); |
| 69 | while (_suspend_all) { |
| 70 | ml.wait(Mutex::_no_safepoint_check_flag); |
| 71 | } |
| 72 | assert(_nthreads_stopped > 0, "Invalid"); |
| 73 | _nthreads_stopped--; |
| 74 | ml.notify_all(); |
| 75 | } |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | void SuspendibleThreadSet::synchronize() { |
| 80 | assert(Thread::current()->is_VM_thread(), "Must be the VM thread"); |
| 81 | if (ConcGCYieldTimeout > 0) { |
| 82 | _suspend_all_start = os::elapsedTime(); |
| 83 | } |
| 84 | MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag); |
| 85 | assert(!_suspend_all, "Only one at a time"); |
| 86 | _suspend_all = true; |
| 87 | while (_nthreads_stopped < _nthreads) { |
| 88 | ml.wait(Mutex::_no_safepoint_check_flag); |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | void SuspendibleThreadSet::desynchronize() { |
| 93 | assert(Thread::current()->is_VM_thread(), "Must be the VM thread"); |
| 94 | MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag); |
| 95 | assert(_nthreads_stopped == _nthreads, "Invalid"); |
| 96 | _suspend_all = false; |
| 97 | ml.notify_all(); |
| 98 | } |