1 /*

     2  * Copyright (c) 2019, 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  */

    24 

    25 #ifndef OS_LINUX_WAITBARRIER_LINUX_HPP

    26 #define OS_LINUX_WAITBARRIER_LINUX_HPP

    27 

    28 #include "memory/allocation.hpp"

    29 

    30 class LinuxWaitBarrier : public CHeapObj<mtInternal> {

    31   volatile int _futex_barrier;

    32 

    33   // Prevent copying and assignment of LinuxWaitBarrier instances.

    34   LinuxWaitBarrier(const LinuxWaitBarrier&);

    35   LinuxWaitBarrier& operator=(const LinuxWaitBarrier&);

    36 

    37  public:

    38   LinuxWaitBarrier() : _futex_barrier(0) {};

    39   ~LinuxWaitBarrier() {};

    40 

    41   const char* description() { return "futex"; }

    42 

    43   void arm(int barrier_tag);

    44   void disarm();

    45   void wait(int barrier_tag);

    46 };

    47 

    48 #endif // OS_LINUX_WAITBARRIER_LINUX_HPP