introduced callback_job:

simple asynchronous method invocation
  use daemons thread pool for all threads
  proper cancellation and cleanups
  cancellation mechanism to dynamically unload multithreaded code
unified event_queue and scheduler => scheduler
unified job_queue and thread_pool => processor
removed job_type_t, not really needed
fixes here, there and everywhere

src/charon/processing/jobs/callback_job.c

@@ -0,0 +1,213 @@
+/**
+ * @file callback_job.c
+ * 
+ * @brief Implementation of callback_job_t.
+ * 
+ */
+
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * 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.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * 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.
+ */
+ 
+#include "callback_job.h"
+
+#include <daemon.h>
+
+typedef struct private_callback_job_t private_callback_job_t;
+
+/**
+ * Private data of an callback_job_t Object.
+ */
+struct private_callback_job_t {
+	/**
+	 * Public callback_job_t interface.
+	 */
+	callback_job_t public;
+	
+	/**
+	 * Callback to call on execution
+	 */
+	callback_job_cb_t callback;
+
+	/**
+	 * parameter to supply to callback
+	 */
+	void *data;
+	
+	/**
+	 * cleanup function for data
+	 */
+	callback_job_cleanup_t cleanup;
+	
+	/**
+	 * thread ID of the job, if running
+	 */
+	pthread_t thread;
+
+	/**
+	 * mutex to synchronize thread startup/cancellation
+	 */
+	pthread_mutex_t mutex;
+
+	/**
+	 * condvar to synchronize thread startup/cancellation
+	 */
+	pthread_cond_t condvar;
+	
+	/**
+	 * list of asociated child jobs
+	 */
+	linked_list_t *children;
+	
+	/**
+	 * parent of this job, or NULL
+	 */
+	private_callback_job_t *parent;
+};
+
+/**
+ * Implements job_t.destroy.
+ */
+static void destroy(private_callback_job_t *this)
+{
+	if (this->cleanup)
+	{
+		this->cleanup(this->data);
+	}
+	this->children->destroy(this->children);
+	free(this);
+}
+
+/**
+ * unregister a child from its parent, if any.
+ */
+static void unregister(private_callback_job_t *this)
+{
+	if (this->parent)
+	{
+		iterator_t *iterator;
+		private_callback_job_t *child;
+		
+		pthread_mutex_lock(&this->parent->mutex);
+		iterator = this->parent->children->create_iterator(this->parent->children, TRUE);
+		while (iterator->iterate(iterator, (void**)&child))
+		{
+			if (child == this)
+			{
+				iterator->remove(iterator);
+				break;
+			}
+		}
+		iterator->destroy(iterator);
+		pthread_mutex_unlock(&this->parent->mutex);
+	}
+}
+
+/**
+ * Implementation of callback_job_t.cancel.
+ */
+static void cancel(private_callback_job_t *this)
+{
+	pthread_t thread;
+	
+	/* wait until thread has started */
+	pthread_mutex_lock(&this->mutex);
+	while (this->thread == 0)
+	{
+		pthread_cond_wait(&this->condvar, &this->mutex);
+	}
+	thread = this->thread;
+	
+	/* terminate its children */
+	this->children->invoke(this->children, offsetof(callback_job_t, cancel));
+	pthread_mutex_unlock(&this->mutex);
+	
+	/* terminate thread */
+	pthread_cancel(thread);
+	pthread_join(thread, NULL);
+}
+
+/**
+ * Implementation of job_t.execute.
+ */
+static void execute(private_callback_job_t *this)
+{
+	bool cleanup = FALSE;
+
+	pthread_mutex_lock(&this->mutex);
+	this->thread = pthread_self();
+	pthread_cond_signal(&this->condvar);
+	pthread_mutex_unlock(&this->mutex);
+	
+	pthread_cleanup_push((void*)destroy, this);
+	while (TRUE)
+	{
+		switch (this->callback(this->data))
+		{
+			case JOB_REQUEUE_DIRECT:
+				continue;
+			case JOB_REQUEUE_FAIR:
+			{
+				charon->processor->queue_job(charon->processor,
+											 &this->public.job_interface);
+				break;
+			}
+			case JOB_REQUEUE_NONE:
+			default:
+			{
+				cleanup = TRUE;
+				break;
+			}
+		}
+		break;
+	}
+	unregister(this);
+	pthread_cleanup_pop(cleanup);
+}
+
+/*
+ * Described in header.
+ */
+callback_job_t *callback_job_create(callback_job_cb_t cb, void *data,
+									callback_job_cleanup_t cleanup,
+									callback_job_t *parent)
+{
+	private_callback_job_t *this = malloc_thing(private_callback_job_t);
+	
+	/* interface functions */
+	this->public.job_interface.execute = (void (*) (job_t *)) execute;
+	this->public.job_interface.destroy = (void (*) (job_t *)) destroy;
+	this->public.cancel = (void(*)(callback_job_t*))cancel;
+
+	/* private variables */
+	pthread_mutex_init(&this->mutex, NULL);
+	pthread_cond_init(&this->condvar, NULL);
+	this->callback = cb;
+	this->data = data;
+	this->cleanup = cleanup;
+	this->thread = 0;
+	this->children = linked_list_create();
+	this->parent = (private_callback_job_t*)parent;
+	
+	/* register us at parent */
+	if (parent)
+	{
+		pthread_mutex_lock(&this->parent->mutex);
+		this->parent->children->insert_last(this->parent->children, this);
+		pthread_mutex_unlock(&this->parent->mutex);
+	}
+	
+	return &this->public;
+}
+