thread.h

00001 //
00002 // thread.h
00003 //
00004 // Copyright (C) 1997 Limit Point Systems, Inc.
00005 //
00006 // Author: Edward Seidl <seidl@janed.com>
00007 // Maintainer: LPS
00008 //
00009 // This file is part of the SC Toolkit.
00010 //
00011 // The SC Toolkit is free software; you can redistribute it and/or modify
00012 // it under the terms of the GNU Library General Public License as published by
00013 // the Free Software Foundation; either version 2, or (at your option)
00014 // any later version.
00015 //
00016 // The SC Toolkit is distributed in the hope that it will be useful,
00017 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00018 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00019 // GNU Library General Public License for more details.
00020 //
00021 // You should have received a copy of the GNU Library General Public License
00022 // along with the SC Toolkit; see the file COPYING.LIB.  If not, write to
00023 // the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
00024 //
00025 // The U.S. Government is granted a limited license as per AL 91-7.
00026 //
00027 
00028 #ifndef _util_group_thread_h
00029 #define _util_group_thread_h
00030 
00031 #ifdef __GNUC__
00032 #pragma interface
00033 #endif
00034 
00035 #include <util/class/class.h>
00036 
00037 namespace sc {
00038 
00044 class ThreadLock : public RefCount {
00045   public:
00046     ThreadLock();
00047     virtual ~ThreadLock();
00048 
00050     virtual void lock() =0;
00052     virtual void unlock() =0;
00053 };
00054 
00055 
00060 class ThreadLockHolder {
00061     Ref<ThreadLock> lock_;
00062     bool locked_;
00063   public:
00065     ThreadLockHolder(const Ref<ThreadLock> &l): lock_(l) {
00066       lock_->lock();
00067       locked_ = true;
00068     }
00070     void unlock() { if (locked_) { lock_->unlock(); locked_ = false; } }
00072     void lock() { if (!locked_) { lock_->lock(); locked_ = true; } }
00074     ~ThreadLockHolder() { unlock(); }
00075 };
00076 
00079 class Thread {
00080   public:
00081     Thread();
00082     virtual ~Thread();
00083 
00084     static void *run_Thread_run(void*thread);
00085 
00087     virtual void run() =0;
00088 };
00089     
00092 class ThreadGrp: public DescribedClass {
00093   protected:
00094     Thread** threads_;
00095     int nthread_;
00096 
00097   public:
00098     ThreadGrp();
00099     ThreadGrp(const Ref<KeyVal>&);
00100     ThreadGrp(const ThreadGrp&, int nthread = -1);
00101     virtual ~ThreadGrp();
00102 
00105     virtual void add_thread(int threadnum, Thread* thread);
00109     virtual void add_thread(int threadnum, Thread* thread, int priority);
00111     int nthread() const { return nthread_; }
00112 
00113     void delete_threads();
00114 
00117     virtual int start_threads() =0;
00120     virtual int wait_threads() =0;
00122     virtual Ref<ThreadLock> new_lock() =0;
00123 
00128     virtual ThreadGrp* clone(int nthread = -1);
00129 
00130     static void set_default_threadgrp(const Ref<ThreadGrp>&);
00131     static ThreadGrp * get_default_threadgrp();
00132     static ThreadGrp * initial_threadgrp(int &argc, char ** argv);
00133 };
00134 
00135 
00139 class ProcThreadGrp: public ThreadGrp {
00140   public:
00141     ProcThreadGrp();
00142     ProcThreadGrp(const Ref<KeyVal>&);
00143     ~ProcThreadGrp();
00144 
00145     int start_threads();
00146     int wait_threads();
00147     
00148     Ref<ThreadLock> new_lock();
00149 
00150     ThreadGrp* clone(int nthread = -1);
00151 };
00152 
00153 }
00154 
00155 extern "C" {
00156     // a C linkage interface to run_Thread_run
00157     void *Thread__run_Thread_run(void*thread);
00158 }
00159 
00160 #endif
00161 
00162 // Local Variables:
00163 // mode: c++
00164 // c-file-style: "ETS"
00165 // End:

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