X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=sched.h;h=a6ea5b34ca8bf47b77765b0860dc19c06f3b813d;hp=8a6ed1a80fb9fca7493f311bbf9116234c19bdb3;hb=d0f8004acf8e8f78323d672813b4ead62d0c92ff;hpb=bc5f28a9274c3b8ed5086399cec3b1c9b3e250b9;ds=sidebyside

diff --git a/sched.h b/sched.h
index 8a6ed1a8..a6ea5b34 100644
--- a/sched.h
+++ b/sched.h
@@ -1,30 +1,20 @@
 /*
  * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
  *
- *     This program is free software; you can redistribute it and/or modify
- *     it under the terms of the GNU General Public License as published by
- *     the Free Software Foundation; either version 2 of the License, or
- *     (at your option) any later version.
- *
- *     This program is distributed in the hope that it will be useful,
- *     but WITHOUT ANY WARRANTY; without even the implied warranty of
- *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *     GNU General Public License for more details.
- *
- *     You should have received a copy of the GNU General Public License
- *     along with this program; if not, write to the Free Software
- *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
+ * Licensed under the GPL v2. For licencing details see COPYING.
  */
 
-/** \file sched.c Paraslash's task and scheduling functions */
+/** \file sched.h sched and task structures and exported symbols from sched.c */
 
 
 /**
  * paraslash's scheduler
  *
- * desinged with KISS in mind. It maintains two lists: The pre_select list
- * and the post_select list. Tasks add hokks to these lists by registering
- * themselves to the scheduler.
+ * Designed with KISS in mind. It manages two lists of tasks.  The pre_select
+ * list contains pointers to functions that are called before calling select()
+ * from the main loop. Similarly, \a post_select_list is a list of function
+ * pointers each of which is called after the select call. Tasks add hooks to
+ * these lists by registering themselves to the scheduler.
  */
 struct sched {
 	/** initial value before any pre_select call */
@@ -47,16 +37,9 @@ struct sched {
  * before registering a task to the scheduler, the task structure must be
  * filled in properly by the caller.
  *
- * The  pre_select or the post_select pointer, but not both may be NULL.  Once
- * a task is registered, its pre_select and post_select function gets called
- * from the scheduler's mainloop. The purpose of the pre_select loop is to add
- * file descriptors to the fd sets of the scheduler and to decrease the select
- * timeout if neccessary. The post_select function may then evaluate these fd
- * sets and act upon the results.
-
  * If one of these functions return a negative value via \a t->ret the
  * (optional) event_handler gets called (it may also be called in case another
- * event happend). In many cases the only possible event is an error or an eof
+ * event happened). In many cases the only possible event is an error or an eof
  * condition and the event handler simply unregisters the task from the
  * scheduler.
  *
@@ -65,11 +48,20 @@ struct sched {
 struct task {
 	/** pointer to the struct this task is embedded in */
 	void *private_data;
-	/** pre_select hook */
+	/**
+	 * the pre select hook of \a t
+	 *
+	 * Its purpose is to add file descriptors to the fd sets of the
+	 * scheduler and to decrease the select timeout if necessary.
+	 */
 	void (*pre_select)(struct sched *s, struct task *t);
-	/** post_select hook */
+	/**
+	 * the postselect hook of \a t
+	 *
+	 * evaluate and act upon the results of the previous select call.
+	 */
 	void (*post_select)(struct sched *s, struct task *t);
-	/** gets called */
+	/** gets called if pre_select or post_select returned an error */
 	void (*event_handler)(struct task *t);
 	/** pre_select() and post_select store their return value here */
 	int ret;
@@ -89,9 +81,8 @@ struct task {
  */
 extern struct timeval *now;
 
-void *register_task(struct task *t);
+void register_task(struct task *t);
 void unregister_task(struct task *t);
 int sched(struct sched *s);
-void init_sched(void);
 char *get_task_list(void);
 int kill_task(char *id);