Changeset 0aaca60 for lib/events.h

Timestamp:

2006-07-19T16:52:38Z (18 years ago)

Author:

Wilmer van der Gaast <wilmer@…>

Branches:

master

Children:

d3a672c

Parents:

04026d4

Message:

Added some (more) comments to .h files in lib/ and some minor fixes/cleanups.

File:

• lib/events.h (modified) (4 diffs)

lib/events.h

@@ -20 +20 @@
  */
 
-/*
- * Split off the event handling things from proxy.[ch] (and adding timer
- * stuff. This to allow BitlBee to use other libs than GLib for event
- * handling.
- */
+/* This stuff used to be in proxy.c too, but I split it off so BitlBee can
+   use other libraries (like libevent) to handle events. proxy.c is one very
+   nice piece of work from Gaim. It connects to a TCP server in the back-
+   ground and calls a callback function once the connection is ready to use.
+   This function (proxy_connect()) can be found in proxy.c. (It also
+   transparently handles HTTP/SOCKS proxies, when necessary.)
+   
+   This file offers some extra event handling toys, which will be handled
+   by GLib or libevent. The advantage of using libevent is that it can use
+   more advanced I/O polling functions like epoll() in recent Linux
+   kernels. This should improve BitlBee's scalability. */
 
 
@@ -39 +45 @@
 #include <gmodule.h>
 
+/* The conditions you can pass to gaim_input_add()/that will be passed to
+   the given callback function. */
 typedef enum {
         GAIM_INPUT_READ = 1 << 1,
@@ -45 +53 @@
 typedef gboolean (*b_event_handler)(gpointer data, gint fd, b_input_condition cond);
 
+/* For internal use. */
 #define GAIM_READ_COND  (G_IO_IN | G_IO_HUP | G_IO_ERR)
 #define GAIM_WRITE_COND (G_IO_OUT | G_IO_HUP | G_IO_ERR | G_IO_NVAL)
@@ -52 +61 @@
 #define event_debug( x... )
 
+/* Call this once when the program starts. It'll initialize the event handler
+   library (if necessary) and then return immediately. */
 G_MODULE_EXPORT void b_main_init();
+
+/* This one enters the event loop. It shouldn't return until one of the event
+   handlers calls b_main_quit(). */
 G_MODULE_EXPORT void b_main_run();
 G_MODULE_EXPORT void b_main_quit();
 
+
+/* Add event handlers (for I/O or a timeout). The event handler will be called
+   every time the event "happens", until your event handler returns FALSE (or
+   until you remove it using b_event_remove(). As usual, the data argument
+   can be used to pass your own data to the event handler. */
 G_MODULE_EXPORT gint b_input_add(int fd, b_input_condition cond, b_event_handler func, gpointer data);
 G_MODULE_EXPORT gint b_timeout_add(gint timeout, b_event_handler func, gpointer data);
 G_MODULE_EXPORT void b_event_remove(gint id);
 
+/* For now, closesocket() is only a function when using libevent. With GLib
+   it's a preprocessor macro. */
 #ifdef EVENTS_LIBEVENT
 G_MODULE_EXPORT void closesocket(int fd);