events: Rework event subsystem (add_event, send_event) to be more versatile.

add_event_ex is added that takes an extra user_data pointer. This pointer is
passed to the callback (add_event and add_event_ex have slightly different
callbacks types). All callbacks also get the event id passed. Events added
with add_event_ex must be removed with remove_event_ex because the user_data
pointer must match in addition to the callback pointer.

On the other add_event is simplified to omit the oneshort parameter which
was almost always false (still there with add_event_ex).

As a side effect the ata_idle_notify callbacks are changed as well, they
do not take a data parameter anymore which was always NULL anyway.

This commit also adds some documentation to events.h

Change-Id: I13e29a0f88ef908f175b376d83550f9e0231f772

1 files changed, 2 insertions, 4 deletions

diff --git a/apps/tagcache.c b/apps/tagcache.c
index 3ce0247188..b7d5516e81 100644
--- a/apps/tagcache.c
+++ b/apps/tagcache.c
@@ -3195,9 +3195,8 @@ static bool command_queue_is_full(void)
     return (next == command_queue_ridx);
 }
 
-static void command_queue_sync_callback(void *data)
+static void command_queue_sync_callback(void)
 {
-    (void)data;
     struct master_header myhdr;
     int masterfd;
         
@@ -3246,7 +3245,7 @@ static void run_command_queue(bool force)
         return;
     
     if (force || command_queue_is_full())
-        command_queue_sync_callback(NULL);
+        command_queue_sync_callback();
     else
         register_storage_idle_func(command_queue_sync_callback);
 }
@@ -4898,4 +4897,3 @@ int tagcache_get_max_commit_step(void)
 {
     return (int)(SORTED_TAGS_COUNT)+1;
 }
-