/*
- * Copyright (C) 2006-2010 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2006-2013 Andre Noll <maan@systemlinux.org>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
/** Initial value before any pre_select call. */
struct timeval default_timeout;
/** The current timeout for the upcoming select call. */
- struct timeval timeout;
+ struct timeval select_timeout;
/** fds that should be watched for readability. */
fd_set rfds;
/** fds that should be watched for writability. */
fd_set wfds;
/** Highest numbered file descriptor in any of the above fd sets. */
int max_fileno;
- /** In non-NULL, use this function instead of para_select. */
+ /** If non-NULL, use this function instead of para_select. */
int (*select_function)(int, fd_set *, fd_set *, struct timeval *);
+ /** Currently active pre_select functions. */
+ struct list_head pre_select_list;
+ /** Currently active post_select functions. */
+ struct list_head post_select_list;
};
/**
* Before registering a task to the scheduler, the task structure must be
* filled in properly by the caller.
*
- * If one of these functions sets \a t->error to a negative value, the
- * task gets unregistered automatically.
- *
- * \sa struct sched.
+ * \sa \ref sched.
*/
struct task {
/**
*/
void (*pre_select)(struct sched *s, struct task *t);
/**
- * The postselect hook of \a t.
+ * The post select hook of \a t.
*
- * Evaluate and act upon the results of the previous select call.
+ * 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.
*/
- void (*post_select)(struct sched *s, struct task *t);
+ int (*post_select)(struct sched *s, struct task *t);
/** Whether this task is in error state. */
int error;
/** Position of the task in the pre_select list of the scheduler. */
struct list_head post_select_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;
};
/**
* This is set by the scheduler at the beginning of its main loop. It may be
* used (read-only) from everywhere. As none of the functions called by the
* scheduler are allowed to block, this value should be accurate enough so that
- * there is no need to call gettimeofday() directly.
+ * there is no need to call clock_gettime() directly.
*/
extern struct timeval *now;
-void register_task(struct task *t);
+void register_task(struct sched *s, struct task *t);
int schedule(struct sched *s);
-char *get_task_list(void);
-int kill_task(char *id);
-void sched_shutdown(void);
+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);
void sched_min_delay(struct sched *s);
-void sched_request_timeout(struct timeval *timeout, struct sched *s);
+void sched_request_timeout(struct timeval *to, struct sched *s);
void sched_request_timeout_ms(long unsigned ms, struct sched *s);
-void sched_request_barrier(struct timeval *barrier, struct sched *s);
-void sched_request_barrier_or_min_delay(struct timeval *barrier, struct sched *s);
+int sched_request_barrier(struct timeval *barrier, struct sched *s);
+int sched_request_barrier_or_min_delay(struct timeval *barrier, struct sched *s);