doc: Add documentation for the pool memory allocator

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@4720 38d2e660-2303-0410-9eaa-f027e97ec537

diff --git a/bertos/struct/pool.h b/bertos/struct/pool.h
index a44b14f3518b04d573290b573caaddb94a046209..9bf4535b54822d2a49353f00f9f512a167c0d86b 100644 (file)
--- a/bertos/struct/pool.h
+++ b/bertos/struct/pool.h
@@ -26,12 +26,54 @@
  * invalidate any other reasons why the executable file might be covered by
  * the GNU General Public License.
  *
- * Copyright 2004, 2008 Develer S.r.l. (http://www.develer.com/)
+ * Copyright 2004, 2008, 2011 Develer S.r.l. (http://www.develer.com/)
  * -->
  *
+ * \defgroup pool Pool memory allocator
+ * \ingroup struct
+ * \{
+ *
  * \brief Pool macros.
  *
+ * The pool module provides the boilerplate code to create a set of objects
+ * of the same type.
+ * It provides an interface similar to the heap module, with pool_alloc() and
+ * pool_free() functions that allocate and free an element respectively.
+ * In contrast with the heap module, you can specify exactly the number of
+ * items that you want to be in the pool.
+ *
+ * Items in the pool must be a derived class of <tt>Node *</tt>, which also
+ * means that they can be used as-is with list containers, eg. MsgPort.
+ *
+ * Example code:
+ * \code
+ * typedef struct MyType
+ * {
+ *     Node *n;
+ *     uint16_t *buf;
+ *     // other members here...
+ * } MyType;
+ *
+ * DECLARE_POOL(mypool, MyType, POOL_SIZE);
+ *
+ * static void elem_init(MyType *e)
+ * {
+ *     e->buf = NULL;
+ *     // other initializations here
+ * }
+ *
+ * int main(void)
+ * {
+ *     pool_init(&mypool, elem_init);
+ *
+ *     MyType *foo = pool_alloc(&mypool);
+ *     // do stuff with foo
+ *     pool_free(&mypool, foo);
+ * }
+ * \endcode
+ *
  * \author Giovanni Bajo <rasky@develer.com>
+ * \author Luca Ottaviano <lottaviano@develer.com>
  */
 
 #ifndef STRUCT_POOL_H
@@ -40,6 +82,9 @@
 #include <cfg/macros.h>
 #include <struct/list.h>
 
+/**
+ * \brief Extern pool declaration
+ */
 #define EXTERN_POOL(name) \
        extern List name
 
@@ -62,7 +107,7 @@
 /**
  * \brief Helper macro to declare a Pool data type.
  *
- * Data type inserted into the pool must be a \code Node * \endcode
+ * Data type inserted into the pool must be a <tt>Node *</tt>
  * type.
  *
  * \param name Variable name of the pool.
@@ -72,15 +117,32 @@
 #define DECLARE_POOL(name, type, num) \
        DECLARE_POOL_WITH_STORAGE(name, type, num, List)
 
+/**
+ * \brief Static Pool declaration
+ *
+ * \sa DECLARE_POOL
+ */
 #define DECLARE_POOL_STATIC(name, type, num) \
        DECLARE_POOL_WITH_STORAGE(name, type, num, static List)
 
+/**
+ * Initialize the pool \a name, calling \a init_func on each element.
+ *
+ * The init function must have the following prototype:
+ * \code
+ * void init_func(type *)
+ * \endcode
+ * where \a type is the type of objects held in the pool.
+ *
+ * \param name Pool to initialize
+ * \param init_func Init function to be called on each element
+ */
 #define pool_init(name, init_func)     (*(name##_init))(init_func)
 
 /**
  * \brief Allocate an element from the pool.
  *
- * The returned element is of type \code Node * \endcode, it's safe to
+ * The returned element is of type <tt>Node *</tt>, it's safe to
  * cast it to the type contained in the pool.
  *
  * \note If the element was recycled with pool_free(), it will not be reset,
@@ -110,4 +172,6 @@
  */
 #define pool_empty(name)               LIST_EMPTY(name)
 
+ /** \} */ /* defgroup pool */
+
 #endif /* STRUCT_POOL_H */