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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   public:
00063     ThreadLockHolder(const Ref<ThreadLock> &l): lock_(l) { lock_->lock(); }
00064     ~ThreadLockHolder() { lock_->unlock(); }
00065 };
00066 
00069 class Thread {
00070   public:
00071     Thread();
00072     virtual ~Thread();
00073 
00074     static void *run_Thread_run(void*thread);
00075 
00077     virtual void run() =0;
00078 };
00079     
00082 class ThreadGrp: public DescribedClass {
00083   protected:
00084     Thread** threads_;
00085     int nthread_;
00086 
00087   public:
00088     ThreadGrp();
00089     ThreadGrp(const Ref<KeyVal>&);
00090     ThreadGrp(const ThreadGrp&, int nthread = -1);
00091     virtual ~ThreadGrp();
00092 
00095     virtual void add_thread(int threadnum, Thread* thread);
00099     virtual void add_thread(int threadnum, Thread* thread, int priority);
00101     int nthread() const { return nthread_; }
00102 
00103     void delete_threads();
00104 
00107     virtual int start_threads() =0;
00110     virtual int wait_threads() =0;
00112     virtual Ref<ThreadLock> new_lock() =0;
00113 
00118     virtual ThreadGrp* clone(int nthread = -1);
00119 
00120     static void set_default_threadgrp(const Ref<ThreadGrp>&);
00121     static ThreadGrp * get_default_threadgrp();
00122     static ThreadGrp * initial_threadgrp(int &argc, char ** argv);
00123 };
00124 
00125 
00129 class ProcThreadGrp: public ThreadGrp {
00130   public:
00131     ProcThreadGrp();
00132     ProcThreadGrp(const Ref<KeyVal>&);
00133     ~ProcThreadGrp();
00134 
00135     int start_threads();
00136     int wait_threads();
00137     
00138     Ref<ThreadLock> new_lock();
00139 
00140     ThreadGrp* clone(int nthread = -1);
00141 };
00142 
00143 }
00144 
00145 extern "C" {
00146     // a C linkage interface to run_Thread_run
00147     void *Thread__run_Thread_run(void*thread);
00148 }
00149 
00150 #endif
00151 
00152 // Local Variables:
00153 // mode: c++
00154 // c-file-style: "ETS"
00155 // End:

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