/*
- * Copyright (C) 2006-2014 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2006 Andre Noll <maan@tuebingen.mpg.de>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
struct list_head task_list;
};
-/**
- * Paraslash's task structure.
- *
- * Before registering a task to the scheduler, the task structure must be
- * filled in properly by the caller.
- *
- * \sa \ref sched.
- */
-struct task {
+struct task;
+
+/** Information that must be supplied by callers of \ref task_register(). */
+struct task_info {
+ /** Used for log messages and by \ref get_task_list(). */
+ const char *name;
/**
- * The optional pre select hook of \a t.
+ * The optional pre select method.
*
* 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);
+ void (*pre_select)(struct sched *s, void *context);
/**
- * The mandatory post select hook of \a t.
+ * The mandatory post select method.
*
* Its purpose is to evaluate and act upon the results of the previous
* select call. If this function returns a negative value, the
* scheduler unregisters the task.
*/
- int (*post_select)(struct sched *s, struct task *t);
- /** Whether this task is active (>=0) or in error state (<0). */
- int error;
- /** Position of the task in the task list of the scheduler. */
- struct list_head node;
- /** Descriptive text and current status of the task. */
- char status[255];
- /** If less than zero, the task was notified by another task. */
- int notification;
+ int (*post_select)(struct sched *s, void *context);
+ /**
+ * This pointer is saved when the task is registered. It is passed to
+ * ->pre_select() and ->post_select(). Usually this is a pointer to the
+ * struct owned by the caller which contains the task pointer.
+ */
+ void *context;
};
/**
* scheduler are allowed to block, this value should be accurate enough so that
* there is no need to call clock_gettime() directly.
*/
-extern struct timeval *now;
+extern const struct timeval *now;
-void register_task(struct sched *s, struct task *t);
+struct task *task_register(struct task_info *info, struct sched *s);
int schedule(struct sched *s);
+void sched_shutdown(struct sched *s);
char *get_task_list(struct sched *s);
void task_notify(struct task *t, int err);
void task_notify_all(struct sched *s, int err);
-int task_get_notification(struct task *t);
+int task_get_notification(const struct task *t);
+int task_status(const struct task *t);
+int task_reap(struct task **tptr);
void sched_min_delay(struct sched *s);
void sched_request_timeout(struct timeval *to, struct sched *s);
void sched_request_timeout_ms(long unsigned ms, struct sched *s);