128 lines
2.9 KiB
C++
128 lines
2.9 KiB
C++
/*
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Copyright (C) 1998-99 Paul Barton-Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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$Id$
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*/
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#ifndef __qm_thread_h__
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#define __qm_thread_h__
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#include <pthread.h>
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/* A generic base class for Quasimodo objects requiring their own
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thread to do work.
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*/
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class QMThread
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{
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public:
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QMThread (const char *name,
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void *(start)(void *), void *,
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bool realtime = false, int rt_priority = 10);
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virtual ~QMThread();
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int run ();
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void poke ();
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void pause ();
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void stop ();
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void *wait ();
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/* This doesn't guarantee anything about the state of
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the thread, but if you do things the right way, and
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make sure that the do_work() routine checks
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work_no_more() at the right times, and that the
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thread is awake, then calling this will cause
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the thread to exit fairly quickly.
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*/
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void halt() { _must_exit = true ; }
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void exit (void *status);
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pthread_t thread_id() { return _thread; }
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bool thread_ok () { return _have_thread; }
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bool thread_active() { return _thread_active; }
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bool thread_running () {
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/* XXX not atomic */
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return _running && _thread_active;
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}
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bool thread_waiting () { return _thread_waiting; }
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static void try_to_kill_all_threads() {
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all_threads_must_die = true;
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}
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protected:
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void *main ();
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bool work_no_more () { return (!_running || _must_exit || all_threads_must_die); }
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bool myself () {
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return pthread_equal (_thread, pthread_self());
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}
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void suspend() {
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_running = false;
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}
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void lock (pthread_mutex_t *lock) {
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pthread_mutex_lock (lock);
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}
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void unlock (pthread_mutex_t *lock) {
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pthread_mutex_unlock (lock);
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}
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virtual void *do_work () = 0;
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private:
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const char *_name;
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bool _must_exit;
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bool _running;
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bool _thread_active;
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bool _thread_waiting;
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bool _have_thread;
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size_t work_cnt;
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pthread_mutex_t status_lock;
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pthread_cond_t wake_up; /* protected by status_lock */
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pthread_cond_t asleep; /* protected by status_lock */
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pthread_cond_t running; /* protected by status_lock */
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pthread_cond_t exited; /* protected by status_lock */
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pthread_t _thread;
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void lock () {
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pthread_mutex_lock (&status_lock);
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}
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void unlock () {
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pthread_mutex_unlock (&status_lock);
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}
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static bool all_threads_must_die;
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static void signal_catcher (int sig);
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void setup_signals ();
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};
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#endif // __qm_thread_h__
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