1 /*
   2  * Copyright (c) 2015, 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_POSIX_SEMAPHORE_POSIX_HPP
  26 #define OS_POSIX_SEMAPHORE_POSIX_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 #include "utilities/macros.hpp"
  30 
  31 #include <semaphore.h>
  32 
  33 class PosixSemaphore : public CHeapObj<mtInternal> {
  34   sem_t _semaphore;
  35 
  36   NONCOPYABLE(PosixSemaphore);
  37 
  38  public:
  39   PosixSemaphore(uint value = 0);
  40   ~PosixSemaphore();
  41 
  42   void signal(uint count = 1);
  43 
  44   void wait();
  45 
  46   bool trywait();
  47   // wait until the given absolute time is reached
  48   bool timedwait(struct timespec ts);
  49   // wait until the given relative time elapses
  50   bool timedwait(int64_t millis);
  51 };
  52 
  53 typedef PosixSemaphore SemaphoreImpl;
  54 
  55 #endif // OS_POSIX_SEMAPHORE_POSIX_HPP