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author7 <NotZed@Ximian.com>2001-09-28 06:36:53 +0800
committerMichael Zucci <zucchi@src.gnome.org>2001-09-28 06:36:53 +0800
commitc3d6f44895ba788921ab04798c615d2cbac959a7 (patch)
tree95c5994c41bd66832643947d8cc7aef46c4cdb9f
parent0ac20c6064de6f082ac466731e9fee416cb083f4 (diff)
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Fill the finalised data with nonsense, rather than 0's - more easily
2001-09-27 <NotZed@Ximian.com> * camel-object.c (camel_object_unref): Fill the finalised data with nonsense, rather than 0's - more easily detect bad data. (camel_object_new): Clear instance data when we retrieve it off the list. * camel-object.h (_CamelObject): Added an event lock pointer for uh, locking event stuff. Also change the hooklist hashtable into a list. Changed all the code to handle it. Result: thread-safe events, event-hooks, and save memory too, and SHOULD FINALLY FIX THAT UNREAD COUNT PROBLEM. svn path=/trunk/; revision=13201
-rw-r--r--camel/ChangeLog13
-rw-r--r--camel/camel-object.c231
-rw-r--r--camel/camel-object.h2
3 files changed, 218 insertions, 28 deletions
diff --git a/camel/ChangeLog b/camel/ChangeLog
index ce3b17a206..b3eccf05f1 100644
--- a/camel/ChangeLog
+++ b/camel/ChangeLog
@@ -1,3 +1,16 @@
+2001-09-27 <NotZed@Ximian.com>
+
+ * camel-object.c (camel_object_unref): Fill the finalised data
+ with nonsense, rather than 0's - more easily detect bad data.
+ (camel_object_new): Clear instance data when we retrieve it off
+ the list.
+
+ * camel-object.h (_CamelObject): Added an event lock pointer for
+ uh, locking event stuff. Also change the hooklist hashtable into
+ a list. Changed all the code to handle it. Result: thread-safe
+ events, event-hooks, and save memory too, and SHOULD FINALLY FIX
+ THAT UNREAD COUNT PROBLEM.
+
2001-09-27 Jeffrey Stedfast <fejj@ximian.com>
* camel-pgp-mime.c (camel_pgp_mime_part_decrypt): CRLF decode the
diff --git a/camel/camel-object.c b/camel/camel-object.c
index ed8c255eaf..fde35f3be1 100644
--- a/camel/camel-object.c
+++ b/camel/camel-object.c
@@ -30,6 +30,13 @@
#include <string.h>
#include "camel-object.h"
+/* FIXME: Make the code so this isn't necessary, its just the hook locking thats the problem */
+#ifndef ENABLE_THREADS
+#error "Threads must be enabled to compile this version of camel"
+#endif
+
+#include <pthread.h>
+
/* I just mashed the keyboard for these... */
#define CAMEL_OBJECT_MAGIC_VALUE 0x77A344EF
#define CAMEL_OBJECT_CLASS_MAGIC_VALUE 0xEE26A990
@@ -63,12 +70,27 @@ typedef struct _CamelTypeInfo
}
CamelTypeInfo;
+/* A 'locked' hooklist, that is only allocated on demand */
+typedef struct _CamelHookList {
+ pthread_mutex_t lock;
+
+ struct _CamelHookPair *list;
+} CamelHookList;
+
+/* a 'hook pair', actually a hook tuple, we just store all hooked events in the same list,
+ and just comapre as we go, rather than storing separate lists for each hook type
+
+ the name field just points directly to the key field in the class's preplist hashtable.
+ This way we can just use a direct pointer compare when scanning it, and also saves
+ copying the string */
typedef struct _CamelHookPair
{
+ struct _CamelHookPair *next; /* next MUST be the first member */
+
+ const char *name; /* points to the key field in the classes preplist, static memory */
CamelObjectEventHookFunc func;
- gpointer user_data;
-}
-CamelHookPair;
+ void *data;
+} CamelHookPair;
/* ************************************************************************ */
@@ -84,6 +106,8 @@ static gboolean shared_is_of_type (CamelObjectShared * sh, CamelType ctype,
gboolean is_obj);
static void make_global_classfuncs (CamelTypeInfo * type_info);
+static void camel_object_free_hooks(CamelObject *o);
+
/* ************************************************************************ */
G_LOCK_DEFINE_STATIC (type_system);
@@ -322,7 +346,7 @@ obj_init (CamelObject * obj)
{
obj->s.magic = CAMEL_OBJECT_MAGIC_VALUE;
obj->ref_count = 1;
- obj->event_to_hooklist = NULL;
+ obj->hooks = NULL;
obj->in_event = 0;
obj->destroying = 0;
}
@@ -336,11 +360,7 @@ obj_finalize (CamelObject * obj)
obj->s.magic = CAMEL_OBJECT_FINALIZED_VALUE;
- if (obj->event_to_hooklist) {
- g_hash_table_foreach (obj->event_to_hooklist, (GHFunc) g_free, NULL);
- g_hash_table_destroy (obj->event_to_hooklist);
- obj->event_to_hooklist = NULL;
- }
+ camel_object_free_hooks(obj);
}
static void
@@ -359,6 +379,7 @@ obj_class_finalize (CamelObjectClass * class)
class->s.magic = CAMEL_OBJECT_CLASS_FINALIZED_VALUE;
if (class->event_to_preplist) {
+ /* FIXME: This leaks the preplist slist entries */
g_hash_table_foreach (class->event_to_preplist,
(GHFunc) g_free, NULL);
g_hash_table_destroy (class->event_to_preplist);
@@ -411,6 +432,7 @@ camel_object_new (CamelType type)
type_info->free_instances =
g_list_remove_link (type_info->free_instances, first);
g_list_free_1 (first);
+ memset (instance, 0, type_info->instance_size);
} else {
instance = g_mem_chunk_alloc0 (type_info->instance_chunk);
}
@@ -557,10 +579,11 @@ camel_object_unref (CamelObject * obj)
/* A little bit of cleaning up.
* Don't erase the type, so we can peek at it if a finalized object
- * is check_cast'ed somewhere.
+ * is check_cast'ed somewhere. Fill it with gunk to help detect
+ * other invalid ref's of it.
*/
- memset (obj, 0, type_info->instance_size);
+ memset (obj, 0xEB, type_info->instance_size);
obj->s.type = type_info->self;
obj->s.magic = CAMEL_OBJECT_FINALIZED_VALUE;
@@ -682,18 +705,98 @@ camel_object_class_declare_event (CamelObjectClass * class,
g_hash_table_insert (class->event_to_preplist, g_strdup (name), prep);
}
+/* free hook data */
+static void camel_object_free_hooks(CamelObject *o)
+{
+ CamelHookPair *pair, *next;
+
+ if (o->hooks) {
+ pair = o->hooks->list;
+ while (pair) {
+ next = pair->next;
+ g_free(pair);
+ pair = next;
+ }
+ g_free(o->hooks);
+ o->hooks = NULL;
+ }
+}
+
+/* return (allocate if required) the object's hook list, locking at the same time */
+static CamelHookList *camel_object_get_hooks(CamelObject *o)
+{
+#ifdef ENABLE_THREADS
+ static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
+#endif
+ CamelHookList *hooks;
+
+ /* if we have it, we dont have to do any other locking,
+ otherwise use a global lock to setup the object's hook data */
+#ifdef ENABLE_THREADS
+ if (o->hooks == NULL) {
+ pthread_mutex_lock(&lock);
+#endif
+ if (o->hooks == NULL) {
+ hooks = g_malloc(sizeof(*o->hooks));
+#ifdef ENABLE_THREADS
+ pthread_mutex_init(&hooks->lock, NULL);
+#endif
+ hooks->list = NULL;
+ o->hooks = hooks;
+ }
+#ifdef ENABLE_THREADS
+ pthread_mutex_unlock(&lock);
+ }
+#endif
+
+#ifdef ENABLE_THREADS
+ pthread_mutex_lock(&o->hooks->lock);
+#endif
+ return o->hooks;
+}
+
+/* unlock object hooks' list */
+#ifdef ENABLE_THREADS
+#define camel_object_unget_hooks(o) (pthread_mutex_unlock(&(CAMEL_OBJECT(o)->hooks->lock)))
+#else
+#define camel_object_unget_hooks(o)
+#endif
+
void
-camel_object_hook_event (CamelObject * obj, const gchar * name,
- CamelObjectEventHookFunc hook, gpointer user_data)
+camel_object_hook_event (CamelObject * obj, const char * name,
+ CamelObjectEventHookFunc func, void *data)
{
- GSList *hooklist;
CamelHookPair *pair;
- gpointer old_name, old_hooklist;
+ const char *prepname;
+ CamelObjectEventPrepFunc prep;
+ CamelHookList *hooks;
g_return_if_fail (CAMEL_IS_OBJECT (obj));
- g_return_if_fail (name);
- g_return_if_fail (hook);
+ g_return_if_fail (name != NULL);
+ g_return_if_fail (func != NULL);
+
+ /* first, does this event exist? */
+ if (obj->classfuncs->event_to_preplist == NULL
+ || !g_hash_table_lookup_extended(obj->classfuncs->event_to_preplist, name,
+ (void **)&prepname, (void **)&prep)) {
+ g_warning("camel_object_hook_event: trying to hook event `%s' in class `%s' with no defined events.",
+ name, camel_type_to_name (obj->s.type));
+ return;
+ }
+
+ /* setup hook pair */
+ pair = g_malloc(sizeof(*pair));
+ pair->name = prepname; /* effectively static! */
+ pair->func = func;
+ pair->data = data;
+ /* get the hook list object, locked, link in new event hook, unlock */
+ hooks = camel_object_get_hooks(obj);
+ pair->next = hooks->list;
+ hooks->list = pair;
+ camel_object_unget_hooks(obj);
+
+#if 0
if (obj->event_to_hooklist == NULL)
obj->event_to_hooklist =
g_hash_table_new (g_str_hash, g_str_equal);
@@ -712,19 +815,61 @@ camel_object_hook_event (CamelObject * obj, const gchar * name,
g_hash_table_insert (obj->event_to_hooklist, g_strdup (name),
hooklist);
}
+#endif
}
void
-camel_object_unhook_event (CamelObject * obj, const gchar * name,
- CamelObjectEventHookFunc hook, gpointer user_data)
+camel_object_unhook_event (CamelObject * obj, const char * name,
+ CamelObjectEventHookFunc func, void *data)
{
+#if 0
GSList *hooklist;
GSList *head;
+#endif
+ char *prepname;
+ CamelObjectEventPrepFunc prep;
+ CamelHookList *hooks;
+ CamelHookPair *pair, *parent;
g_return_if_fail (CAMEL_IS_OBJECT (obj));
- g_return_if_fail (name);
- g_return_if_fail (hook);
+ g_return_if_fail (name != NULL);
+ g_return_if_fail (func != NULL);
+ if (obj->hooks == NULL) {
+ g_warning("camel_object_unhook_event: trying to unhook `%s` from an instance of `%s' with no hooks",
+ name, camel_type_to_name(obj->s.type));
+ return;
+ }
+
+ /* get event name static pointer */
+ if (obj->classfuncs->event_to_preplist == NULL
+ || !g_hash_table_lookup_extended(obj->classfuncs->event_to_preplist, name,
+ (void **)&prepname, (void **)&prep)) {
+ g_warning("camel_object_hook_event: trying to hook event `%s' in class `%s' with no defined events.",
+ name, camel_type_to_name (obj->s.type));
+ return;
+ }
+
+ /* scan hooks for this event, remove it */
+ hooks = camel_object_get_hooks(obj);
+ parent = (CamelHookPair *)&hooks->list;
+ pair = parent->next;
+ while (pair) {
+ if (pair->name == prepname && pair->func == func && pair->data == data) {
+ parent->next = pair->next;
+ g_free(pair);
+ camel_object_unget_hooks(obj);
+ return;
+ }
+ parent = pair;
+ pair = pair->next;
+ }
+ camel_object_unget_hooks(obj);
+
+ g_warning("camel_object_unhook_event: cannot find hook/data pair %p/%p in an instance of `%s' attached to `%s'",
+ func, data, camel_type_to_name (obj->s.type), name);
+
+#if 0
if (obj->event_to_hooklist == NULL) {
g_warning
("camel_object_unhook_event: trying to unhook `%s' from an instance "
@@ -764,23 +909,54 @@ camel_object_unhook_event (CamelObject * obj, const gchar * name,
("camel_object_unhook_event: cannot find hook/data pair %p/%p in an "
"instance of `%s' attached to `%s'", hook, user_data,
camel_type_to_name (obj->s.type), name);
+#endif
}
void
-camel_object_trigger_event (CamelObject * obj, const gchar * name,
- gpointer event_data)
+camel_object_trigger_event (CamelObject * obj, const char * name, void *event_data)
{
- GSList *hooklist;
CamelHookPair *pair;
CamelObjectEventPrepFunc prep;
+ const char *prepname;
+ CamelHookList *hooks;
g_return_if_fail (CAMEL_IS_OBJECT (obj));
g_return_if_fail (name);
+ /* no hooks, dont bother going anywhere */
+ if (obj->hooks == NULL)
+ return;
+
+ /* get event name static pointer/prep func */
+ if (obj->classfuncs->event_to_preplist == NULL
+ || !g_hash_table_lookup_extended(obj->classfuncs->event_to_preplist, name,
+ (void **)&prepname, (void **)&prep)) {
+ g_warning("camel_object_hook_event: trying to hook event `%s' in class `%s' with no defined events.",
+ name, camel_type_to_name (obj->s.type));
+ return;
+ }
+
+ /* lock the object for hook emission */
+ camel_object_ref(obj);
+ hooks = camel_object_get_hooks(obj);
+
+ if (prep == NULL_PREP_VALUE || prep(obj, event_data)) {
+ pair = hooks->list;
+ while (pair) {
+ if (pair->name == prepname)
+ (pair->func) (obj, event_data, pair->data);
+
+ pair = pair->next;
+ }
+ }
+
+ camel_object_unget_hooks(obj);
+ camel_object_unref(obj);
+
+#if 0
if (obj->in_event) {
- g_warning
- ("camel_object_trigger_event: trying to trigger `%s' in class "
- "`%s' while already triggering another event", name,
+ g_warning("camel_object_trigger_event: trying to trigger `%s' in class "
+ "`%s' while already triggering another event", name,
camel_type_to_name (obj->s.type));
return;
}
@@ -827,6 +1003,7 @@ camel_object_trigger_event (CamelObject * obj, const gchar * name,
obj->in_event = 0;
camel_object_unref (obj);
+#endif
}
/* ** Static helpers ****************************************************** */
diff --git a/camel/camel-object.h b/camel/camel-object.h
index 484d414f10..ec0416d4f4 100644
--- a/camel/camel-object.h
+++ b/camel/camel-object.h
@@ -82,7 +82,7 @@ typedef struct _CamelObject
{
CamelObjectShared s;
CamelObjectClass *classfuncs;
- GHashTable *event_to_hooklist;
+ struct _CamelHookList *hooks;
guint32 ref_count:30;
guint32 in_event:1;
guint32 destroying:1;