1 files changed, 127 insertions, 0 deletions
diff --git a/libs/pbd3/pbd/thread.h b/libs/pbd3/pbd/thread.h
new file mode 100644
index 0000000000..c1d5c3c78d
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+++ b/libs/pbd3/pbd/thread.h
@@ -0,0 +1,127 @@
+/*
+    Copyright (C) 1998-99 Paul Barton-Davis 
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+    $Id$
+*/
+
+#ifndef __qm_thread_h__
+#define __qm_thread_h__
+
+#include <pthread.h>
+
+/* A generic base class for Quasimodo objects requiring their own
+   thread to do work.
+*/
+
+class QMThread 
+
+{
+ public:
+	QMThread (const char *name, 
+		  void *(start)(void *), void *, 
+		  bool realtime = false, int rt_priority = 10);
+
+	virtual ~QMThread();
+
+	int   run ();
+	void  poke ();
+	void  pause ();
+	void  stop ();
+	void  *wait ();
+
+	/* This doesn't guarantee anything about the state of
+	   the thread, but if you do things the right way, and
+	   make sure that the do_work() routine checks 
+	   work_no_more() at the right times, and that the
+	   thread is awake, then calling this will cause
+	   the thread to exit fairly quickly.
+	*/
+
+	void  halt() { _must_exit = true ; }
+
+	void  exit (void *status);
+	pthread_t thread_id() { return _thread; }
+
+	bool thread_ok () { return _have_thread; }
+	bool thread_active() { return _thread_active; }
+
+	bool thread_running () {
+		/* XXX not atomic */
+		return _running && _thread_active;
+	}
+
+	bool thread_waiting () { return _thread_waiting; }
+
+	static void try_to_kill_all_threads() {
+		all_threads_must_die = true;
+	}
+
+ protected:
+	void *main ();
+
+	bool  work_no_more () { return (!_running || _must_exit || all_threads_must_die); }
+
+	bool  myself () { 
+		return pthread_equal (_thread, pthread_self());
+	}
+
+	void suspend() {
+		_running = false;
+	}
+
+	void lock (pthread_mutex_t *lock) {
+		pthread_mutex_lock (lock);
+	}
+	
+	void unlock (pthread_mutex_t *lock) {
+		pthread_mutex_unlock (lock);
+	}
+
+	virtual void *do_work () = 0;
+
+  private:
+	const char *_name;
+	bool _must_exit;
+	bool _running;
+	bool _thread_active;
+	bool _thread_waiting;
+	bool _have_thread;
+
+	size_t work_cnt;
+
+	pthread_mutex_t status_lock;
+	pthread_cond_t wake_up; /* protected by status_lock */
+	pthread_cond_t asleep;  /* protected by status_lock */
+	pthread_cond_t running; /* protected by status_lock */
+	pthread_cond_t exited;  /* protected by status_lock */
+	pthread_t _thread;
+	
+	void lock () { 
+		pthread_mutex_lock (&status_lock);
+	}
+
+	void unlock () { 
+		pthread_mutex_unlock (&status_lock);
+	}
+
+	static bool all_threads_must_die;
+	
+	static void signal_catcher (int sig);
+	void setup_signals ();
+};
+
+#endif // __qm_thread_h__