comphelper/source/misc/solarmutex.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <sal/config.h>
  21
  22 #include <comphelper/solarmutex.hxx>
  23 #include <osl/thread.hxx>
  24
  25 #include <assert.h>
  26 #include <cstdlib>
  27
  28 namespace comphelper {
  29
  30 namespace {
  31     SolarMutex* g_pSolarMutex = nullptr;
  32 }
  33
  34 SolarMutex *SolarMutex::get()
  35 {
  36     return g_pSolarMutex;
  37 }
  38
  39 SolarMutex::SolarMutex()
  40     : m_nCount( 0 )
  41     , m_aBeforeReleaseHandler( nullptr )
  42 {
  43     assert(!g_pSolarMutex);
  44     g_pSolarMutex = this;
  45 }
  46
  47 SolarMutex::~SolarMutex()
  48 {
  49     g_pSolarMutex = nullptr;
  50 }
  51
  52 void SolarMutex::doAcquire( const sal_uInt32 nLockCount )
  53 {
  54     for ( sal_uInt32 n = nLockCount; n ; --n )
  55         m_aMutex.acquire();
  56     m_nThreadId = std::this_thread::get_id();
  57     m_nCount += nLockCount;
  58 }
  59
  60 sal_uInt32 SolarMutex::doRelease( bool bUnlockAll )
  61 {
  62     if ( !IsCurrentThread() )
  63         std::abort();
  64     if ( m_nCount == 0 )
  65         std::abort();
  66
  67     const sal_uInt32 nCount = bUnlockAll ? m_nCount : 1;
  68     m_nCount -= nCount;
  69
  70     if ( 0 == m_nCount )
  71     {
  72         if ( m_aBeforeReleaseHandler )
  73             m_aBeforeReleaseHandler();
  74         m_nThreadId = std::thread::id();
  75     }
  76
  77     for ( sal_uInt32 n = nCount ; n ; --n )
  78         m_aMutex.release();
  79
  80     return nCount;
  81 }
  82
  83 bool SolarMutex::IsCurrentThread() const
  84 {
  85     return m_nThreadId == std::this_thread::get_id();
  86 }
  87
  88 bool SolarMutex::tryToAcquire()
  89 {
  90     if ( m_aMutex.tryToAcquire() )
  91     {
  92         m_nThreadId = std::this_thread::get_id();
  93         m_nCount++;
  94         return true;
  95     }
  96     else
  97         return false;
  98 }
  99
 100 } // namespace comphelper
 101
 102 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */