summaryrefslogtreecommitdiff
path: root/src/libstrongswan/utils/blocking_queue.h
diff options
context:
space:
mode:
Diffstat (limited to 'src/libstrongswan/utils/blocking_queue.h')
-rw-r--r--src/libstrongswan/utils/blocking_queue.h97
1 files changed, 97 insertions, 0 deletions
diff --git a/src/libstrongswan/utils/blocking_queue.h b/src/libstrongswan/utils/blocking_queue.h
new file mode 100644
index 000000000..cf2712cf4
--- /dev/null
+++ b/src/libstrongswan/utils/blocking_queue.h
@@ -0,0 +1,97 @@
+/*
+ * 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.
+ */
+
+/**
+ * @defgroup blocking_queue blocking_queue
+ * @{ @ingroup utils
+ */
+
+#ifndef BLOCKING_QUEUE_H_
+#define BLOCKING_QUEUE_H_
+
+typedef struct blocking_queue_t blocking_queue_t;
+
+#include <library.h>
+
+/**
+ * Class implementing a synchronized blocking queue based on linked_list_t
+ */
+struct blocking_queue_t {
+
+ /**
+ * Inserts a new item at the tail of the queue
+ *
+ * @param item item to insert in queue
+ */
+ void (*enqueue)(blocking_queue_t *this, void *item);
+
+ /**
+ * Removes the first item in the queue and returns its value.
+ * If the queue is empty, this call blocks until a new item is inserted.
+ *
+ * @note This is a thread cancellation point
+ *
+ * @return removed item
+ */
+ void *(*dequeue)(blocking_queue_t *this);
+
+ /**
+ * Destroys a blocking_queue_t object.
+ *
+ * @note No thread must wait in dequeue() when this function is called
+ */
+ void (*destroy)(blocking_queue_t *this);
+
+ /**
+ * Destroys a queue and its objects using the given destructor.
+ *
+ * If a queue and the contained objects should be destroyed, use
+ * destroy_offset. The supplied offset specifies the destructor to
+ * call on each object. The offset may be calculated using the offsetof
+ * macro, e.g.: queue->destroy_offset(queue, offsetof(object_t, destroy));
+ *
+ * @note No thread must wait in dequeue() when this function is called
+ *
+ * @param offset offset of the objects destructor
+ */
+ void (*destroy_offset)(blocking_queue_t *this, size_t offset);
+
+ /**
+ * Destroys a queue and its objects using a cleanup function.
+ *
+ * If a queue and its contents should get destroyed using a specific
+ * cleanup function, use destroy_function. This is useful when the
+ * list contains malloc()-ed blocks which should get freed,
+ * e.g.: queue->destroy_function(queue, free);
+ *
+ * @note No thread must wait in dequeue() when this function is called
+ *
+ * @param function function to call on each object
+ */
+ void (*destroy_function)(blocking_queue_t *this, void (*)(void*));
+
+};
+
+/**
+ * Creates an empty queue object.
+ *
+ * @return blocking_queue_t object.
+ */
+blocking_queue_t *blocking_queue_create();
+
+#endif /** BLOCKING_QUEUE_H_ @}*/
+