GroovX: src/rutz/mutex.h Source File

00001 
00003 
00004 //
00005 // Copyright (c) 2005-2007 University of Southern California
00006 // Rob Peters <rjpeters at usc dot edu>
00007 //
00008 // created: Tue Sep 13 09:15:02 2005
00009 // commit: $Id: mutex.h 10065 2007-04-12 05:54:56Z rjpeters $
00010 // $HeadURL: file:///lab/rjpeters/svnrepo/code/trunk/groovx/src/rutz/mutex.h $
00011 //
00012 // --------------------------------------------------------------------
00013 //
00014 // This file is part of GroovX.
00015 //   [http://www.klab.caltech.edu/rjpeters/groovx/]
00016 //
00017 // GroovX is free software; you can redistribute it and/or modify it
00018 // under the terms of the GNU General Public License as published by
00019 // the Free Software Foundation; either version 2 of the License, or
00020 // (at your option) any later version.
00021 //
00022 // GroovX is distributed in the hope that it will be useful, but
00023 // WITHOUT ANY WARRANTY; without even the implied warranty of
00024 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00025 // General Public License for more details.
00026 //
00027 // You should have received a copy of the GNU General Public License
00028 // along with GroovX; if not, write to the Free Software Foundation,
00029 // Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
00030 //
00032 
00033 #ifndef GROOVX_RUTZ_MUTEX_H_UTC20050913161502_DEFINED
00034 #define GROOVX_RUTZ_MUTEX_H_UTC20050913161502_DEFINED
00035 
00036 #include <pthread.h>
00037 
00038 namespace rutz
00039 {
00040   class mutex_lock_class;
00041   class mutex_unlocker;
00042 }
00043 
00045 
00049 class rutz::mutex_lock_class
00050 {
00051 public:
00053   mutex_lock_class(pthread_mutex_t* mut = 0);
00054 
00055   ~mutex_lock_class() throw()
00056   {
00057     this->unlock();
00058   }
00059 
00060   bool is_locked() const throw() { return m_mutex != 0; }
00061 
00062   void unlock() throw();
00063 
00064   void swap(mutex_lock_class& that) throw()
00065   {
00066     pthread_mutex_t* const this_mutex = this->m_mutex;
00067     this->m_mutex = that.m_mutex;
00068     that.m_mutex = this_mutex;
00069   }
00070 
00071 private:
00072   pthread_mutex_t* m_mutex;
00073 
00074   mutex_lock_class(const mutex_lock_class&); // not implemented
00075   mutex_lock_class& operator=(const mutex_lock_class&); // not implemented
00076 };
00077 
00078 #define GVX_MUTEX_CONCAT2(x,y) x##y
00079 #define GVX_MUTEX_CONCAT(x,y) GVX_MUTEX_CONCAT2(x,y)
00080 
00081 #define GVX_MUTEX_LOCK(x) \
00082   ::rutz::mutex_lock_class GVX_MUTEX_CONCAT(anonymous_lock,__LINE__) (x)
00083 
00084 static const char __attribute__((used)) vcid_groovx_rutz_mutex_h_utc20050913161502[] = "$Id: mutex.h 10065 2007-04-12 05:54:56Z rjpeters $ $HeadURL: file:
00085 #endif // !GROOVX_RUTZ_MUTEX_H_UTC20050913161502DEFINED