jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/shared/suspendibleThreadSet.hpp@7426d8d76305

8034761: Remove the do_code_roots parameter from process_strong_roots
Reviewed-by: tschatzl, mgerdin, jmasa

     1 /*

     2  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.

     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  */

    25 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_SUSPENDIBLETHREADSET_HPP

    26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_SUSPENDIBLETHREADSET_HPP

    28 #include "memory/allocation.hpp"

    30 // A SuspendibleThreadSet is a set of threads that can be suspended.

    31 // A thread can join and later leave the set, and periodically yield.

    32 // If some thread (not in the set) requests, via synchronize(), that

    33 // the threads be suspended, then the requesting thread is blocked

    34 // until all the threads in the set have yielded or left the set. Threads

    35 // may not enter the set when an attempted suspension is in progress. The

    36 // suspending thread later calls desynchronize(), allowing the suspended

    37 // threads to continue.

    38 class SuspendibleThreadSet : public AllStatic {

    39 private:

    40   static uint   _nthreads;

    41   static uint   _nthreads_stopped;

    42   static bool   _suspend_all;

    43   static double _suspend_all_start;

    45 public:

    46   // Add the current thread to the set. May block if a suspension is in progress.

    47   static void join();

    49   // Removes the current thread from the set.

    50   static void leave();

    52   // Returns true if an suspension is in progress.

    53   static bool should_yield() { return _suspend_all; }

    55   // Suspends the current thread if a suspension is in progress.

    56   static void yield();

    58   // Returns when all threads in the set are suspended.

    59   static void synchronize();

    61   // Resumes all suspended threads in the set.

    62   static void desynchronize();

    63 };

    65 class SuspendibleThreadSetJoiner : public StackObj {

    66 public:

    67   SuspendibleThreadSetJoiner() {

    68     SuspendibleThreadSet::join();

    69   }

    71   ~SuspendibleThreadSetJoiner() {

    72     SuspendibleThreadSet::leave();

    73   }

    75   bool should_yield() {

    76     return SuspendibleThreadSet::should_yield();

    77   }

    79   void yield() {

    80     SuspendibleThreadSet::yield();

    81   }

    82 };

    84 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_SUSPENDIBLETHREADSET_HPP

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