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
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  23  */
  24 
  25 #ifndef OS_BSD_SEMAPHORE_BSD_HPP
  26 #define OS_BSD_SEMAPHORE_BSD_HPP
  27 
  28 #ifndef __APPLE__
  29 // Use POSIX semaphores.
  30 # include "semaphore_posix.hpp"
  31 
  32 #else
  33 // OS X doesn't support unamed POSIX semaphores, so the implementation in os_posix.cpp can't be used.
  34 # include "memory/allocation.hpp"
  35 # include <mach/semaphore.h>
  36 
  37 class OSXSemaphore : public CHeapObj<mtInternal>{
  38   semaphore_t _semaphore;
  39 
  40   // Prevent copying and assignment.
  41   OSXSemaphore(const OSXSemaphore&);
  42   OSXSemaphore& operator=(const OSXSemaphore&);
  43 
  44  public:
  45   OSXSemaphore(uint value = 0);
  46   ~OSXSemaphore();
  47 
  48   void signal(uint count = 1);
  49 
  50   void wait();
  51 
  52   bool trywait();
  53 
  54   // wait until the given relative time elapses
  55   bool timedwait(int64_t millis);
  56 };
  57 
  58 typedef OSXSemaphore SemaphoreImpl;
  59 
  60 #endif // __APPLE__
  61 
  62 #endif // OS_BSD_SEMAPHORE_BSD_HPP