Line data    Source code

       1             : 
       2             : /* Copyright (c) 2005-2012, Stefan Eilemann <eile@equalizergraphics.com> 
       3             :  *
       4             :  * This library is free software; you can redistribute it and/or modify it under
       5             :  * the terms of the GNU Lesser General Public License version 2.1 as published
       6             :  * by the Free Software Foundation.
       7             :  *  
       8             :  * This library is distributed in the hope that it will be useful, but WITHOUT
       9             :  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
      10             :  * FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
      11             :  * details.
      12             :  * 
      13             :  * You should have received a copy of the GNU Lesser General Public License
      14             :  * along with this library; if not, write to the Free Software Foundation, Inc.,
      15             :  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
      16             :  */
      17             : 
      18             : #include "lock.h"
      19             : 
      20             : #include "log.h"
      21             : #include "os.h"
      22             : 
      23             : #include <errno.h>
      24             : #include <string.h>
      25             : #include <pthread.h>
      26             : 
      27             : namespace lunchbox
      28             : {
      29             : namespace detail
      30             : {
      31             : class Lock
      32             : {
      33             : public:
      34             : #ifdef _WIN32
      35             :     CRITICAL_SECTION cs; 
      36             : #else
      37             :     pthread_mutex_t mutex;
      38             : #endif
      39             : };
      40             : }
      41             : 
      42          59 : Lock::Lock()
      43          59 :         : _impl ( new detail::Lock )
      44             : {
      45             : #ifdef _WIN32
      46             :     InitializeCriticalSection( &_impl->cs );
      47             : #else
      48          59 :     const int error = pthread_mutex_init( &_impl->mutex, 0 );
      49          59 :     if( error )
      50             :     {
      51           0 :         LBERROR << "Error creating pthread mutex: "
      52           0 :                 << strerror(error) << std::endl;
      53           0 :         return;
      54             :     }
      55             : #endif
      56             : }
      57             : 
      58          59 : Lock::~Lock()
      59             : {
      60             : #ifdef _WIN32
      61             :     DeleteCriticalSection( &_impl->cs ); 
      62             : #else
      63          59 :     pthread_mutex_destroy( &_impl->mutex );
      64             : #endif
      65          59 :     delete _impl;
      66          59 : }
      67             : 
      68    31949778 : void Lock::set()
      69             : {
      70             : #ifdef _WIN32
      71             :     EnterCriticalSection( &_impl->cs );
      72             : #else
      73    31949778 :     pthread_mutex_lock( &_impl->mutex );
      74             : #endif
      75    31975959 : }
      76             : 
      77    31975964 : void Lock::unset()
      78             : {
      79             : #ifdef _WIN32
      80             :     LeaveCriticalSection( &_impl->cs );
      81             : #else
      82    31975964 :     pthread_mutex_unlock( &_impl->mutex );
      83             : #endif
      84    31813738 : }
      85             : 
      86    31965478 : bool Lock::trySet()
      87             : {
      88             : #ifdef _WIN32
      89             :     return TryEnterCriticalSection( &_impl->cs );
      90             : #else
      91    31965478 :     return ( pthread_mutex_trylock( &_impl->mutex ) == 0 );
      92             : #endif
      93             : }
      94             : 
      95    31965478 : bool Lock::isSet()
      96             : {
      97    31965478 :     if( trySet( ))
      98             :     {
      99           6 :         unset();
     100           6 :         return false;
     101             :     }
     102    31965472 :     return true;
     103             : }
     104             : 
     105          87 : }