[Asterisk-cvs] asterisk/include/asterisk astobj.h,1.13,1.14
kpfleming at lists.digium.com
kpfleming at lists.digium.com
Wed May 4 12:55:33 CDT 2005
Update of /usr/cvsroot/asterisk/include/asterisk
In directory mongoose.digium.com:/tmp/cvs-serv15129/include/asterisk
Modified Files:
astobj.h
Log Message:
add doxygen docs for astobj.h (bug #4145, with minor mods)
Index: astobj.h
===================================================================
RCS file: /usr/cvsroot/asterisk/include/asterisk/astobj.h,v
retrieving revision 1.13
retrieving revision 1.14
diff -u -d -r1.13 -r1.14
--- astobj.h 1 May 2005 18:08:14 -0000 1.13
+++ astobj.h 4 May 2005 17:02:32 -0000 1.14
@@ -17,13 +17,62 @@
#include <string.h>
#include "asterisk/lock.h"
-/*!
- \file astobj.h
- \brief A set of macros implementing the asterisk object and container. Macros
- are used for maximum performance, to support multiple inheritance, and
- to be easily integrated into existing structures without additional
- malloc calls, etc.
-*/
+/*! \file
+ * \brief A set of macros implementing objects and containers.
+ * Macros are used for maximum performance, to support multiple inheritance,
+ * and to be easily integrated into existing structures without additional
+ * malloc calls, etc.
+ *
+ * These macros expect to operate on two different object types, ASTOBJs and
+ * ASTOBJ_CONTAINERs. These are not actual types, as any struct can be
+ * converted into an ASTOBJ compatible object or container using the supplied
+ * macros.
+ *
+ * <b>Sample Usage:</b>
+ * \code
+ * struct sample_object {
+ * ASTOBJ_COMPONENTS(struct sample_object);
+ * };
+ *
+ * struct sample_container {
+ * ASTOBJ_CONTAINER_COMPONENTS(struct sample_object);
+ * } super_container;
+ *
+ * void sample_object_destroy(struct sample_object *obj)
+ * {
+ * free(obj);
+ * }
+ *
+ * int init_stuff()
+ * {
+ * struct sample_object *obj1;
+ * struct sample_object *found_obj;
+ *
+ * obj1 = malloc(sizeof(struct sample_object));
+ *
+ * ASTOBJ_CONTAINER_INIT(&super_container);
+ *
+ * ASTOBJ_INIT(obj1);
+ * ASTOBJ_WRLOCK(obj1);
+ * ast_copy_string(obj1->name, "obj1", sizeof(obj1->name));
+ * ASTOBJ_UNLOCK(obj1);
+ *
+ * ASTOBJ_CONTAINER_LINK(&super_container, obj1);
+ *
+ * found_obj = ASTOBJ_CONTAINER_FIND(&super_container, "obj1");
+ *
+ * if(found_obj) {
+ * printf("Found object: %s", found_obj->name);
+ * ASTOBJ_UNREF(found_obj,sample_object_destroy);
+ * }
+ *
+ * ASTOBJ_CONTAINER_DESTROYALL(&super_container,sample_object_destroy);
+ * ASTOBJ_CONTAINER_DESTROY(&super_container);
+ *
+ * return 0;
+ * }
+ * \endcode
+ */
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
@@ -42,8 +91,15 @@
/* C++ is simply a syntactic crutch for those who cannot think for themselves
in an object oriented way. */
+/*! \brief Lock an ASTOBJ for reading.
+ */
#define ASTOBJ_RDLOCK(object) ast_mutex_lock(&(object)->_lock)
+
+/*! \brief Lock an ASTOBJ for writing.
+ */
#define ASTOBJ_WRLOCK(object) ast_mutex_lock(&(object)->_lock)
+
+/*! \brief Unlock a locked object. */
#define ASTOBJ_UNLOCK(object) ast_mutex_unlock(&(object)->_lock)
#ifdef ASTOBJ_CONTAINER_HASHMODEL
@@ -54,23 +110,88 @@
type *next[1]
#endif
+/*! \brief Add ASTOBJ components to a struct (without locking support).
+ *
+ * \param type The datatype of the object.
+ * \param namelen The length to make the name char array.
+ * \param hashes The number of containers the object can be present in.
+ *
+ * This macro adds components to a struct to make it an ASTOBJ. This macro
+ * differs from ASTOBJ_COMPONENTS_FULL in that it does not create a mutex for
+ * locking.
+ *
+ * <b>Sample Usage:</b>
+ * \code
+ * struct sample_struct {
+ * ASTOBJ_COMPONENTS_NOLOCK_FULL(struct sample_struct,1,1);
+ * };
+ * \endcode
+ */
#define ASTOBJ_COMPONENTS_NOLOCK_FULL(type,namelen,hashes) \
char name[namelen]; \
int refcount; \
int objflags; \
__ASTOBJ_HASH(type,hashes)
+/*! \brief Add ASTOBJ components to a struct (without locking support).
+ *
+ * \param type The datatype of the object.
+ *
+ * This macro works like #ASTOBJ_COMPONENTS_NOLOCK_FULL() except it only accepts a
+ * type and uses default values for namelen and hashes.
+ *
+ * <b>Sample Usage:</b>
+ * \code
+ * struct sample_struct_componets {
+ * ASTOBJ_COMPONENTS_NOLOCK(struct sample_struct);
+ * };
+ * \endcode
+ */
#define ASTOBJ_COMPONENTS_NOLOCK(type) \
ASTOBJ_COMPONENTS_NOLOCK_FULL(type,ASTOBJ_DEFAULT_NAMELEN,1)
+/*! \brief Add ASTOBJ components to a struct (with locking support).
+ *
+ * \param type The datatype of the object.
+ *
+ * This macro works like #ASTOBJ_COMPONENTS_NOLOCK() except it includes locking
+ * support.
+ *
+ * <b>Sample Usage:</b>
+ * \code
+ * struct sample_struct {
+ * ASTOBJ_COMPONENTS(struct sample_struct);
+ * };
+ * \endcode
+ */
#define ASTOBJ_COMPONENTS(type) \
ASTOBJ_COMPONENTS_NOLOCK(type); \
ast_mutex_t _lock;
+/*! \brief Add ASTOBJ components to a struct (with locking support).
+ *
+ * \param type The datatype of the object.
+ * \param namelen The length to make the name char array.
+ * \param hashes The number of containers the object can be present in.
+ *
+ * This macro adds components to a struct to make it an ASTOBJ and includes
+ * support for locking.
+ *
+ * <b>Sample Usage:</b>
+ * \code
+ * struct sample_struct {
+ * ASTOBJ_COMPONENTS_FULL(struct sample_struct,1,1);
+ * };
+ * \endcode
+ */
#define ASTOBJ_COMPONENTS_FULL(type,namelen,hashes) \
ASTOBJ_COMPONENTS_NOLOCK_FULL(type,namelen,hashes); \
ast_mutex_t _lock;
+/*! \brief Increment an object reference count.
+ * \param object A pointer to the object to operate on.
+ * \return The object.
+ */
#define ASTOBJ_REF(object) \
({ \
ASTOBJ_WRLOCK(object); \
@@ -79,6 +200,15 @@
(object); \
})
+/*! \brief Decrement the reference count on an object.
+ *
+ * \param object A pointer the object to operate on.
+ * \param destructor The destructor to call if the object is no longer referenced. It will be passed the pointer as an argument.
+ *
+ * This macro unreferences an object and calls the specfied destructor if the
+ * object is no longer referenced. The destructor should free the object if it
+ * was dynamically allocated.
+ */
#define ASTOBJ_UNREF(object,destructor) \
do { \
int newcount = 0; \
@@ -95,6 +225,13 @@
(object) = NULL; \
} while(0)
+/*! \brief Mark an ASTOBJ by adding the #ASTOBJ_FLAG_MARKED flag to its objflags mask.
+ * \param object A pointer to the object to operate on.
+ *
+ * This macro "marks" an object. Marked objects can later be unlinked from a container using
+ * #ASTOBJ_CONTAINER_PRUNE_MARKED().
+ *
+ */
#define ASTOBJ_MARK(object) \
do { \
ASTOBJ_WRLOCK(object); \
@@ -102,6 +239,9 @@
ASTOBJ_UNLOCK(object); \
} while(0)
+/*! \brief Unmark an ASTOBJ by subtracting the #ASTOBJ_FLAG_MARKED flag from its objflags mask.
+ * \param object A pointer to the object to operate on.
+ */
#define ASTOBJ_UNMARK(object) \
do { \
ASTOBJ_WRLOCK(object); \
@@ -109,6 +249,12 @@
ASTOBJ_UNLOCK(object); \
} while(0)
+/*! \brief Initialize an object.
+ * \param object A pointer to the object to operate on.
+ *
+ * \note This should only be used on objects that support locking (objects
+ * created with #ASTOBJ_COMPONENTS() or #ASTOBJ_COMPONENTS_FULL())
+ */
#define ASTOBJ_INIT(object) \
do { \
ast_mutex_init(&(object)->_lock); \
@@ -119,27 +265,108 @@
/* Containers for objects -- current implementation is linked lists, but
should be able to be converted to hashes relatively easily */
+/*! \brief Lock an ASTOBJ_CONTAINER for reading.
+ */
#define ASTOBJ_CONTAINER_RDLOCK(container) ast_mutex_lock(&(container)->_lock)
+
+/*! \brief Lock an ASTOBJ_CONTAINER for writing.
+ */
#define ASTOBJ_CONTAINER_WRLOCK(container) ast_mutex_lock(&(container)->_lock)
+
+/*! \brief Unlock an ASTOBJ_CONTAINER. */
#define ASTOBJ_CONTAINER_UNLOCK(container) ast_mutex_unlock(&(container)->_lock)
#ifdef ASTOBJ_CONTAINER_HASHMODEL
#error "Hash model for object containers not yet implemented!"
#else
/* Linked lists */
+
+/*! \brief Create a container for ASTOBJs (without locking support).
+ *
+ * \param type The type of objects the container will hold.
+ * \param hashes Currently unused.
+ * \param buckets Currently unused.
+ *
+ * This macro is used to create a container for ASTOBJs without locking
+ * support.
+ *
+ * <b>Sample Usage:</b>
+ * \code
+ * struct sample_struct_nolock_container {
+ * ASTOBJ_CONTAINER_COMPONENTS_NOLOCK_FULL(struct sample_struct,1,1);
+ * };
+ * \endcode
+ */
#define ASTOBJ_CONTAINER_COMPONENTS_NOLOCK_FULL(type,hashes,buckets) \
type *head
+/*! \brief Initialize a container.
+ *
+ * \param container A pointer to the container to initialize.
+ * \param hashes Currently unused.
+ * \param buckets Currently unused.
+ *
+ * This macro initializes a container. It should only be used on containers
+ * that support locking.
+ *
+ * <b>Sample Usage:</b>
+ * \code
+ * struct sample_struct_container {
+ * ASTOBJ_CONTAINER_COMPONENTS_FULL(struct sample_struct,1,1);
+ * } container;
+ *
+ * int func()
+ * {
+ * ASTOBJ_CONTAINER_INIT_FULL(&container,1,1);
+ * }
+ * \endcode
+ */
#define ASTOBJ_CONTAINER_INIT_FULL(container,hashes,buckets) \
do { \
ast_mutex_init(&(container)->_lock); \
} while(0)
+/*! \brief Destroy a container.
+ *
+ * \param container A pointer to the container to destroy.
+ * \param hashes Currently unused.
+ * \param buckets Currently unused.
+ *
+ * This macro frees up resources used by a container. It does not operate on
+ * the objects in the container. To unlink the objects from the container use
+ * #ASTOBJ_CONTAINER_DESTROYALL().
+ *
+ * \note This macro should only be used on containers with locking support.
+ */
#define ASTOBJ_CONTAINER_DESTROY_FULL(container,hashes,buckets) \
do { \
ast_mutex_destroy(&(container)->_lock); \
} while(0)
+/*! \brief Iterate through the objects in a container.
+ *
+ * \param container A pointer to the container to traverse.
+ * \param continue A condition to allow the traversal to continue.
+ * \param eval A statement to evaluate in the iteration loop.
+ *
+ * This is macro is a little complicated, but it may help to think of it as a
+ * loop. Basically it iterates through the specfied containter as long as the
+ * condition is met. Two variables, iterator and next, are provided for use in
+ * your \p eval statement. See the sample code for an example.
+ *
+ * <b>Sample Usage:</b>
+ * \code
+ * ASTOBJ_CONTAINER_TRAVERSE(&sample_container,1, {
+ * ASTOBJ_RDLOCK(iterator);
+ * printf("Currently iterating over '%s'\n", iterator->name);
+ * ASTOBJ_UNLOCK(iterator);
+ * } );
+ * \endcode
+ *
+ * \code
+ * ASTOBJ_CONTAINER_TRAVERSE(&sample_container,1, sample_func(iterator));
+ * \endcode
+ */
#define ASTOBJ_CONTAINER_TRAVERSE(container,continue,eval) \
do { \
typeof((container)->head) iterator; \
@@ -153,6 +380,18 @@
ASTOBJ_CONTAINER_UNLOCK(container); \
} while(0)
+/*! \brief Find an object in a container.
+ *
+ * \param container A pointer to the container to search.
+ * \param namestr The name to search for.
+ *
+ * Use this function to find an object with the specfied name in a container.
+ *
+ * \note When the returned object is no longer in use, #ASTOBJ_UNREF() should
+ * be used to free the additional reference created by this macro.
+ *
+ * \return A new reference to the object located or NULL if nothing is found.
+ */
#define ASTOBJ_CONTAINER_FIND(container,namestr) \
({ \
typeof((container)->head) found = NULL; \
@@ -163,6 +402,23 @@
found; \
})
+/*! \brief Find an object in a container.
+ *
+ * \param container A pointer to the container to search.
+ * \param data The data to search for.
+ * \param field The field/member of the container's objects to search.
+ * \param hashfunc The hash function to use, currently not implemented.
+ * \param hashoffset The hash offset to use, currently not implemented.
+ * \param comparefunc The function used to compare the field and data values.
+ *
+ * This macro iterates through a container passing the specified field and data
+ * elements to the specified comparefunc. The function should return 0 when a match is found.
+ *
+ * \note When the returned object is no longer in use, #ASTOBJ_UNREF() should
+ * be used to free the additional reference created by this macro.
+ *
+ * \return A pointer to the object located or NULL if nothing is found.
+ */
#define ASTOBJ_CONTAINER_FIND_FULL(container,data,field,hashfunc,hashoffset,comparefunc) \
({ \
typeof((container)->head) found = NULL; \
@@ -176,6 +432,18 @@
found; \
})
+/*! \brief Empty a container.
+ *
+ * \param container A pointer to the container to operate on.
+ * \param destructor A destructor function to call on each object.
+ *
+ * This macro loops through a container removing all the items from it using
+ * #ASTOBJ_UNREF(). This does not destroy the container itself, use
+ * #ASTOBJ_CONTAINER_DESTROY() for that.
+ *
+ * \note If any object in the container is only referenced by the container,
+ * the destructor will be called for that object once it has been removed.
+ */
#define ASTOBJ_CONTAINER_DESTROYALL(container,destructor) \
do { \
typeof((container)->head) iterator; \
@@ -187,6 +455,19 @@
ASTOBJ_CONTAINER_UNLOCK(container); \
} while(0)
+/*! \brief Remove an object from a container.
+ *
+ * \param container A pointer to the container to operate on.
+ * \param obj A pointer to the object to remove.
+ *
+ * This macro iterates through a container and removes the specfied object if
+ * it exists in the container.
+ *
+ * \note This macro does not destroy any objects, it simply unlinks
+ * them from the list. No destructors are called.
+ *
+ * \return The object unlinked or NULL if no matching object was found.
+ */
#define ASTOBJ_CONTAINER_UNLINK(container,obj) \
({ \
typeof((container)->head) found = NULL; \
@@ -207,6 +488,20 @@
found; \
})
+/*! \brief Find and remove an object from a container.
+ *
+ * \param container A pointer to the container to operate on.
+ * \param namestr The name of the object to remove.
+ *
+ * This macro iterates through a container and removes the first object with
+ * the specfied name from the container.
+ *
+ * \note This macro does not destroy any objects, it simply unlinks
+ * them. No destructors are called.
+ *
+ * \return The container's reference to the removed object or NULL if no
+ * matching object was found.
+ */
#define ASTOBJ_CONTAINER_FIND_UNLINK(container,namestr) \
({ \
typeof((container)->head) found = NULL; \
@@ -227,6 +522,25 @@
found; \
})
+/*! \brief Find and remove an object in a container.
+ *
+ * \param container A pointer to the container to search.
+ * \param data The data to search for.
+ * \param field The field/member of the container's objects to search.
+ * \param hashfunc The hash function to use, currently not implemented.
+ * \param hashoffset The hash offset to use, currently not implemented.
+ * \param comparefunc The function used to compare the field and data values.
+ *
+ * This macro iterates through a container passing the specified field and data
+ * elements to the specified comparefunc. The function should return 0 when a match is found.
+ * If a match is found it is removed from the list.
+ *
+ * \note This macro does not destroy any objects, it simply unlinks
+ * them. No destructors are called.
+ *
+ * \return The container's reference to the removed object or NULL if no match
+ * was found.
+ */
#define ASTOBJ_CONTAINER_FIND_UNLINK_FULL(container,data,field,hashfunc,hashoffset,comparefunc) \
({ \
typeof((container)->head) found = NULL; \
@@ -249,6 +563,14 @@
found; \
})
+/*! \brief Prune marked objects from a container.
+ *
+ * \param container A pointer to the container to prune.
+ * \param destructor A destructor function to call on each marked object.
+ *
+ * This macro iterates through the specfied container and prunes any marked
+ * objects executing the specfied destructor if necessary.
+ */
#define ASTOBJ_CONTAINER_PRUNE_MARKED(container,destructor) \
do { \
typeof((container)->head) prev = NULL; \
@@ -270,6 +592,20 @@
} while (0)); \
} while(0)
+/*! \brief Add an object to a container.
+ *
+ * \param container A pointer to the container to operate on.
+ * \param newobj A pointer to the object to be added.
+ * \param data Currently unused.
+ * \param field Currently unused.
+ * \param hashfunc Currently unused.
+ * \param hashoffset Currently unused.
+ * \param comparefunc Currently unused.
+ *
+ * Currently this function adds an object to the head of the list. One day it
+ * will support adding objects atthe position specified using the various
+ * options this macro offers.
+ */
#define ASTOBJ_CONTAINER_LINK_FULL(container,newobj,data,field,hashfunc,hashoffset,comparefunc) \
do { \
ASTOBJ_CONTAINER_WRLOCK(container); \
@@ -281,31 +617,123 @@
#endif /* List model */
/* Common to hash and linked list models */
+
+/*! \brief Create a container for ASTOBJs (without locking support).
+ *
+ * \param type The type of objects the container will hold.
+ *
+ * This macro is used to create a container for ASTOBJs without locking
+ * support.
+ *
+ * <b>Sample Usage:</b>
+ * \code
+ * struct sample_struct_nolock_container {
+ * ASTOBJ_CONTAINER_COMPONENTS_NOLOCK(struct sample_struct);
+ * };
+ * \endcode
+ */
#define ASTOBJ_CONTAINER_COMPONENTS_NOLOCK(type) \
ASTOBJ_CONTAINER_COMPONENTS_NOLOCK_FULL(type,1,ASTOBJ_DEFAULT_BUCKETS)
+
+/*! \brief Create a container for ASTOBJs (with locking support).
+ *
+ * \param type The type of objects the container will hold.
+ *
+ * This macro is used to create a container for ASTOBJs with locking support.
+ *
+ * <b>Sample Usage:</b>
+ * \code
+ * struct sample_struct_container {
+ * ASTOBJ_CONTAINER_COMPONENTS(struct sample_struct);
+ * };
+ * \endcode
+ */
#define ASTOBJ_CONTAINER_COMPONENTS(type) \
ast_mutex_t _lock; \
ASTOBJ_CONTAINER_COMPONENTS_NOLOCK(type)
+/*! \brief Initialize a container.
+ *
+ * \param container A pointer to the container to initialize.
+ *
+ * This macro initializes a container. It should only be used on containers
+ * that support locking.
+ *
+ * <b>Sample Usage:</b>
+ * \code
+ * struct sample_struct_container {
+ * ASTOBJ_CONTAINER_COMPONENTS(struct sample_struct);
+ * } container;
+ *
+ * int func()
+ * {
+ * ASTOBJ_CONTAINER_INIT(&container);
+ * }
+ * \endcode
+ */
#define ASTOBJ_CONTAINER_INIT(container) \
ASTOBJ_CONTAINER_INIT_FULL(container,1,ASTOBJ_DEFAULT_BUCKETS)
+/*! \brief Destroy a container.
+ *
+ * \param container A pointer to the container to destory.
+ *
+ * This macro frees up resources used by a container. It does not operate on
+ * the objects in the container. To unlink the objects from the container use
+ * #ASTOBJ_CONTAINER_DESTROYALL().
+ *
+ * \note This macro should only be used on containers with locking support.
+ */
#define ASTOBJ_CONTAINER_DESTROY(container) \
ASTOBJ_CONTAINER_DESTROY_FULL(container,1,ASTOBJ_DEFAULT_BUCKETS)
+/*! \brief Add an object to a container.
+ *
+ * \param container A pointer to the container to operate on.
+ * \param newobj A pointer to the object to be added.
+ *
+ * Currently this macro adds an object to the head of a container. One day it
+ * should add an object in alphabetical order.
+ */
#define ASTOBJ_CONTAINER_LINK(container,newobj) \
ASTOBJ_CONTAINER_LINK_FULL(container,newobj,(newobj)->name,name,ASTOBJ_DEFAULT_HASH,0,strcasecmp)
+/*! \brief Mark all the objects in a container.
+ * \param container A pointer to the container to operate on.
+ */
#define ASTOBJ_CONTAINER_MARKALL(container) \
ASTOBJ_CONTAINER_TRAVERSE(container, 1, ASTOBJ_MARK(iterator))
+/*! \brief Unmark all the objects in a container.
+ * \param container A pointer to the container to operate on.
+ */
#define ASTOBJ_CONTAINER_UNMARKALL(container) \
ASTOBJ_CONTAINER_TRAVERSE(container, 1, ASTOBJ_UNMARK(iterator))
+/*! \brief Dump information about an object into a string.
+ *
+ * \param s A pointer to the string buffer to use.
+ * \param slen The length of s.
+ * \param obj A pointer to the object to dump.
+ *
+ * This macro dumps a text representation of the name, objectflags, and
+ * refcount fields of an object to the specfied string buffer.
+ */
#define ASTOBJ_DUMP(s,slen,obj) \
snprintf((s),(slen),"name: %s\nobjflags: %d\nrefcount: %d\n\n", (obj)->name, (obj)->objflags, (obj)->refcount);
+/*! \brief Dump information about all the objects in a container to a file descriptor.
+ *
+ * \param fd The file descriptor to write to.
+ * \param s A string buffer, same as #ASTOBJ_DUMP().
+ * \param slen The length of s, same as #ASTOBJ_DUMP().
+ * \param container A pointer to the container to dump.
+ *
+ * This macro dumps a text representation of the name, objectflags, and
+ * refcount fields of all the objects in a container to the specified file
+ * descriptor.
+ */
#define ASTOBJ_CONTAINER_DUMP(fd,s,slen,container) \
ASTOBJ_CONTAINER_TRAVERSE(container, 1, do { ASTOBJ_DUMP(s,slen,iterator); ast_cli(fd, s); } while(0))
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