cppu/source/threadpool/jobqueue.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 "jobqueue.hxx"
  21 #include "threadpool.hxx"
  22
  23 #include <osl/diagnose.h>
  24
  25 using namespace ::osl;
  26
  27 namespace cppu_threadpool {
  28
  29     JobQueue::JobQueue() :
  30         m_nToDo( 0 ),
  31         m_bSuspended( false ),
  32         m_cndWait( osl_createCondition() )
  33     {
  34         osl_resetCondition( m_cndWait );
  35         m_DisposedCallerAdmin = DisposedCallerAdmin::getInstance();
  36     }
  37
  38     JobQueue::~JobQueue()
  39     {
  40         osl_destroyCondition( m_cndWait );
  41     }
  42
  43
  44     void JobQueue::add( void *pThreadSpecificData, RequestFun * doRequest )
  45     {
  46         MutexGuard guard( m_mutex );
  47         Job job = { pThreadSpecificData , doRequest };
  48         m_lstJob.push_back( job );
  49         if( ! m_bSuspended )
  50         {
  51             osl_setCondition( m_cndWait );
  52         }
  53         m_nToDo ++;
  54     }
  55
  56     void *JobQueue::enter( sal_Int64 nDisposeId , bool bReturnWhenNoJob )
  57     {
  58         void *pReturn = 0;
  59         {
  60             // synchronize with the dispose calls
  61             MutexGuard guard( m_mutex );
  62             if( m_DisposedCallerAdmin->isDisposed( nDisposeId ) )
  63             {
  64                 return 0;
  65             }
  66             m_lstCallstack.push_front( nDisposeId );
  67         }
  68
  69
  70         while( true )
  71         {
  72             if( bReturnWhenNoJob )
  73             {
  74                 MutexGuard guard( m_mutex );
  75                 if( m_lstJob.empty() )
  76                 {
  77                     break;
  78                 }
  79             }
  80
  81             osl_waitCondition( m_cndWait , 0 );
  82
  83             struct Job job={0,0};
  84             {
  85                 // synchronize with add and dispose calls
  86                 MutexGuard guard( m_mutex );
  87
  88                 if( 0 == m_lstCallstack.front() )
  89                 {
  90                     // disposed !
  91                     if( m_lstJob.empty()
  92                         && (m_lstCallstack.empty()
  93                             || m_lstCallstack.front() != 0) )
  94                     {
  95                         osl_resetCondition( m_cndWait );
  96                     }
  97                     break;
  98                 }
  99
 100                 OSL_ASSERT( ! m_lstJob.empty() );
 101                 if( ! m_lstJob.empty() )
 102                 {
 103                     job = m_lstJob.front();
 104                     m_lstJob.pop_front();
 105                 }
 106                 if( m_lstJob.empty()
 107                     && (m_lstCallstack.empty() || m_lstCallstack.front() != 0) )
 108                 {
 109                     osl_resetCondition( m_cndWait );
 110                 }
 111             }
 112
 113             if( job.doRequest )
 114             {
 115                 job.doRequest( job.pThreadSpecificData );
 116                 MutexGuard guard( m_mutex );
 117                 m_nToDo --;
 118             }
 119             else
 120             {
 121                 pReturn = job.pThreadSpecificData;
 122                 MutexGuard guard( m_mutex );
 123                 m_nToDo --;
 124                 break;
 125             }
 126         }
 127
 128         {
 129             // synchronize with the dispose calls
 130             MutexGuard guard( m_mutex );
 131             m_lstCallstack.pop_front();
 132         }
 133
 134         return pReturn;
 135     }
 136
 137     void JobQueue::dispose( sal_Int64 nDisposeId )
 138     {
 139         MutexGuard guard( m_mutex );
 140         for( CallStackList::iterator ii = m_lstCallstack.begin() ;
 141              ii != m_lstCallstack.end() ;
 142              ++ii )
 143         {
 144             if( (*ii) == nDisposeId )
 145             {
 146                 (*ii) = 0;
 147             }
 148         }
 149
 150         if( !m_lstCallstack.empty()  && ! m_lstCallstack.front() )
 151         {
 152             // The thread is waiting for a disposed pCallerId, let it go
 153             osl_setCondition( m_cndWait );
 154         }
 155     }
 156
 157     void JobQueue::suspend()
 158     {
 159         MutexGuard guard( m_mutex );
 160         m_bSuspended = true;
 161     }
 162
 163     void JobQueue::resume()
 164     {
 165         MutexGuard guard( m_mutex );
 166         m_bSuspended = false;
 167         if( ! m_lstJob.empty() )
 168         {
 169             osl_setCondition( m_cndWait );
 170         }
 171     }
 172
 173     bool JobQueue::isEmpty() const
 174     {
 175         MutexGuard guard( m_mutex );
 176         return m_lstJob.empty();
 177     }
 178
 179     bool JobQueue::isCallstackEmpty() const
 180     {
 181         MutexGuard guard( m_mutex );
 182         return m_lstCallstack.empty();
 183     }
 184
 185     bool JobQueue::isBusy() const
 186     {
 187         MutexGuard guard( m_mutex );
 188         return m_nToDo > 0;
 189     }
 190
 191
 192 }
 193
 194 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */