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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     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: