1 /*
   2  * Copyright (c) 2014, 2018, 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 #include "Lock.h"
  27 
  28 
  29 Lock::Lock(void) {
  30     Initialize();
  31 }
  32 
  33 Lock::Lock(bool Value) {
  34     Initialize();
  35 
  36     if (Value == true) {
  37         Enter();
  38     }
  39 }
  40 
  41 void Lock::Initialize() {
  42 #ifdef WINDOWS
  43     InitializeCriticalSectionAndSpinCount(&FCriticalSection, 0x00000400);
  44 #endif // WINDOWS
  45 #ifdef MAC
  46     // FMutex =  PTHREAD_RECURSIVE_MUTEX_INITIALIZER;
  47 #endif // MAC
  48 #ifdef LINUX
  49     // FMutex =  PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
  50 #endif // LINUX
  51 }
  52 
  53 Lock::~Lock(void) {
  54 #ifdef WINDOWS
  55     DeleteCriticalSection(&FCriticalSection);
  56 #endif // WINDOWS
  57 #ifdef POSIX
  58     pthread_mutex_unlock(&FMutex);
  59 #endif // POSIX
  60 }
  61 
  62 void Lock::Enter() {
  63 #ifdef WINDOWS
  64     EnterCriticalSection(&FCriticalSection);
  65 #endif // WINDOWS
  66 #ifdef POSIX
  67     pthread_mutex_lock(&FMutex);
  68 #endif // POSIX
  69 }
  70 
  71 void Lock::Leave() {
  72 #ifdef WINDOWS
  73     LeaveCriticalSection(&FCriticalSection);
  74 #endif // WINDOWS
  75 #ifdef POSIX
  76     pthread_mutex_unlock(&FMutex);
  77 #endif // POSIX
  78 }
  79 
  80 bool Lock::TryEnter() {
  81     bool result = false;
  82 #ifdef WINDOWS
  83     if (TryEnterCriticalSection (&FCriticalSection) != 0)
  84         result = true;
  85 #endif // WINDOWS
  86 #ifdef POSIX
  87     if (pthread_mutex_lock(&FMutex) == 0)
  88         result = true;
  89 #endif // POSIX
  90     return result;
  91 }