Imported Upstream version 5.0.1

1 files changed, 129 insertions, 0 deletions

diff --git a/src/libstrongswan/utils/blocking_queue.c b/src/libstrongswan/utils/blocking_queue.c
new file mode 100644
index 000000000..c70184198
--- /dev/null
+++ b/src/libstrongswan/utils/blocking_queue.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2012 Tobias Brunner
+ * Copyright (C) 2012 Giuliano Grassi
+ * Copyright (C) 2012 Ralf Sager
+ * 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 "blocking_queue.h"
+
+#include <threading/mutex.h>
+#include <threading/thread.h>
+#include <threading/condvar.h>
+#include <utils/linked_list.h>
+
+typedef struct private_blocking_queue_t private_blocking_queue_t;
+
+/**
+ * Private data of a blocking_queue_t object.
+ */
+struct private_blocking_queue_t {
+
+	/**
+	 * Public part
+	 */
+	blocking_queue_t public;
+
+	/**
+	 * Linked list containing all items in the queue
+	 */
+	linked_list_t *list;
+
+	/**
+	 * Mutex used to synchronize access to the queue
+	 */
+	mutex_t *mutex;
+
+	/**
+	 * Condvar used to wait for items
+	 */
+	condvar_t *condvar;
+
+};
+
+METHOD(blocking_queue_t, enqueue, void,
+	private_blocking_queue_t *this, void *item)
+{
+	this->mutex->lock(this->mutex);
+	this->list->insert_first(this->list, item);
+	this->condvar->signal(this->condvar);
+	this->mutex->unlock(this->mutex);
+}
+
+METHOD(blocking_queue_t, dequeue, void*,
+	private_blocking_queue_t *this)
+{
+	bool oldstate;
+	void *item;
+
+
+	this->mutex->lock(this->mutex);
+	thread_cleanup_push((thread_cleanup_t)this->mutex->unlock, this->mutex);
+	/* ensure that a canceled thread does not dequeue any items */
+	thread_cancellation_point();
+	while (this->list->remove_last(this->list, &item) != SUCCESS)
+	{
+		oldstate = thread_cancelability(TRUE);
+		this->condvar->wait(this->condvar, this->mutex);
+		thread_cancelability(oldstate);
+	}
+	thread_cleanup_pop(TRUE);
+	return item;
+}
+
+METHOD(blocking_queue_t, destroy, void,
+	private_blocking_queue_t *this)
+{
+	this->list->destroy(this->list);
+	this->condvar->destroy(this->condvar);
+	this->mutex->destroy(this->mutex);
+	free(this);
+}
+
+METHOD(blocking_queue_t, destroy_offset, void,
+	private_blocking_queue_t *this, size_t offset)
+{
+	this->list->invoke_offset(this->list, offset);
+	destroy(this);
+}
+
+METHOD(blocking_queue_t, destroy_function, void,
+	private_blocking_queue_t *this, void (*fn)(void*))
+{
+	this->list->invoke_function(this->list, (linked_list_invoke_t)fn);
+	destroy(this);
+}
+
+/*
+ * Described in header.
+ */
+blocking_queue_t *blocking_queue_create()
+{
+	private_blocking_queue_t *this;
+
+	INIT(this,
+		.public = {
+			.enqueue = _enqueue,
+			.dequeue = _dequeue,
+			.destroy = _destroy,
+			.destroy_offset = _destroy_offset,
+			.destroy_function = _destroy_function,
+		},
+		.list = linked_list_create(),
+		.mutex = mutex_create(MUTEX_TYPE_DEFAULT),
+		.condvar = condvar_create(CONDVAR_TYPE_DEFAULT),
+	);
+
+	return &this->public;
+}
+