/*
- * Copyright (C) 2006-2008 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2006-2010 Andre Noll <maan@systemlinux.org>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
-/** \file sched.c paraslash's scheduling functions */
+/** \file sched.c Paraslash's scheduling functions. */
+#include <regex.h>
#include <dirent.h> /* readdir() */
#include <assert.h>
#include <sys/time.h>
static struct timeval now_struct;
struct timeval *now = &now_struct;
+/*
+ * Remove a task from the scheduler.
+ *
+ * \param t The task to remove.
+ *
+ * If the pre_select pointer of \a t is not \p NULL, it is removed from
+ * the pre_select list of the scheduler. Same goes for \a post_select.
+ */
+static void unregister_task(struct task *t)
+{
+ if (!initialized)
+ return;
+ PARA_INFO_LOG("unregistering %s (%s)\n", t->status,
+ t->error <0? para_strerror(-t->error) : "shutdown");
+ if (t->pre_select)
+ list_del(&t->pre_select_node);
+ if (t->post_select)
+ list_del(&t->post_select_node);
+ t->error = -E_TASK_UNREGISTERED;
+}
+
+
static void sched_preselect(struct sched *s)
{
struct task *t, *tmp;
-again:
list_for_each_entry_safe(t, tmp, &pre_select_list, pre_select_node) {
- t->pre_select(s, t);
+ if (t->error >= 0 && t->pre_select)
+ t->pre_select(s, t);
// PARA_INFO_LOG("%s \n", t->status);
- if (t->ret > 0)
+ if (t->error >= 0)
continue;
- if (!t->event_handler)
- continue;
- t->event_handler(t);
- goto again;
+ /*
+ * We have to check whether the list is empty because the call
+ * to ->pre_select() might have called sched_shutdown(). In
+ * this case t has been unregistered already, so we must not
+ * unregister it again.
+ */
+ if (list_empty(&pre_select_list))
+ return;
+ unregister_task(t);
}
}
struct task *t, *tmp;
list_for_each_entry_safe(t, tmp, &post_select_list, post_select_node) {
- t->post_select(s, t);
+ if (t->error >= 0)
+ t->post_select(s, t);
// PARA_INFO_LOG("%s: %d\n", t->status, t->ret);
- if (t->ret > 0 || !t->event_handler)
+ if (t->error >= 0)
continue;
- t->event_handler(t);
+ /* nec., see sched_preselect() */
+ if (list_empty(&post_select_list))
+ return;
+ unregister_task(t);
}
}
/**
- * the core function for all paraslash programs
+ * The core function for all paraslash programs.
*
- * \param s pointer to the scheduler struct
+ * \param s Pointer to the scheduler struct.
*
* This function updates the global \a now pointer, calls all registered
* pre_select hooks which may set the timeout and add any file descriptors to
*/
int schedule(struct sched *s)
{
+ int ret;
+
if (!initialized)
return -E_NOT_INITIALIZED;
- gettimeofday(now, NULL);
+ if (!s->select_function)
+ s->select_function = para_select;
again:
FD_ZERO(&s->rfds);
FD_ZERO(&s->wfds);
s->timeout = s->default_timeout;
s->max_fileno = -1;
+ gettimeofday(now, NULL);
sched_preselect(s);
- s->select_ret = para_select(s->max_fileno + 1, &s->rfds,
- &s->wfds, &s->timeout);
- if (s->select_ret < 0)
- return s->select_ret;
+ if (list_empty(&pre_select_list) && list_empty(&post_select_list))
+ return 0;
+ ret = s->select_function(s->max_fileno + 1, &s->rfds, &s->wfds, &s->timeout);
+ if (ret < 0)
+ return ret;
+ if (ret == 0) {
+ /*
+ * APUE: Be careful not to check the descriptor sets on return
+ * unless the return value is greater than zero. The return
+ * state of the descriptor sets is implementation dependent if
+ * either a signal is caught or the timer expires.
+ */
+ FD_ZERO(&s->rfds);
+ FD_ZERO(&s->wfds);
+ }
gettimeofday(now, NULL);
sched_post_select(s);
if (list_empty(&pre_select_list) && list_empty(&post_select_list))
goto again;
}
-/**
- * initialize the paraslash scheduler
+/*
+ * Initialize the paraslash scheduler.
*/
static void init_sched(void)
{
- PARA_INFO_LOG("%s", "initializing scheduler\n");
+ PARA_INFO_LOG("initializing scheduler\n");
INIT_LIST_HEAD(&pre_select_list);
INIT_LIST_HEAD(&post_select_list);
initialized = 1;
-};
+}
/**
- * add a task to the scheduler
+ * Add a task to the scheduler.
*
* \param t the task to add
*
PARA_INFO_LOG("registering %s (%p)\n", t->status, t);
if (t->pre_select) {
PARA_DEBUG_LOG("pre_select: %p\n", &t->pre_select);
- para_list_add(&t->pre_select_node, &pre_select_list);
+ list_add_tail(&t->pre_select_node, &pre_select_list);
}
if (t->post_select) {
- PARA_DEBUG_LOG("post_select: %p\n", &t->pre_select);
- para_list_add(&t->post_select_node, &post_select_list);
+ PARA_DEBUG_LOG("post_select: %p\n", &t->post_select);
+ list_add_tail(&t->post_select_node, &post_select_list);
}
}
/**
- * remove a task from the scheduler
- *
- * \param t the task to remove
- *
- * If the pre_select pointer of \a t is not \p NULL, it is removed from
- * the pre_select list of the scheduler. Same goes for \a post_select.
- */
-void unregister_task(struct task *t)
-{
- if (!initialized)
- return;
- PARA_INFO_LOG("unregistering %s (%p)\n", t->status, t);
- if (t->pre_select)
- list_del(&t->pre_select_node);
- if (t->post_select)
- list_del(&t->post_select_node);
-};
-
-/**
- * unregister all tasks
+ * Unregister all tasks.
*
* This will cause \a schedule() to return immediately because both the
* \a pre_select_list and the \a post_select_list are empty.
return;
list_for_each_entry_safe(t, tmp, &pre_select_list, pre_select_node)
unregister_task(t);
- /* remove tasks which do not have a pre_select hook */
list_for_each_entry_safe(t, tmp, &post_select_list, post_select_node)
unregister_task(t);
initialized = 0;
-};
+}
/**
- * get the list of all registered tasks.
+ * Get the list of all registered tasks.
*
- * \return the task list
+ * \return The task list.
*
* Each entry of the list contains an identifier which is simply a hex number
* that may be used in \a kill_task() to terminate the task.
- * The result ist dynamically allocated and must be freed by the caller.
+ * The result is dynamically allocated and must be freed by the caller.
*/
char *get_task_list(void)
{
}
/**
- * simulate an error for the given task
+ * Simulate an error for the given task.
*
- * \param id the task identifier
+ * \param id The task identifier.
*
- * Find the task identified by \a id, set the tasks' return value to
- * \p -E_TASK_KILLED and call the event handler of the task.
+ * Find the task identified by \a id, set the tasks' error value to
+ * \p -E_TASK_KILLED and unregister the task.
*
* \return Positive on success, negative on errors (e.g. if \a id does not
* correspond to a registered task).
sprintf(buf, "%p", t);
if (strcmp(id, buf))
continue;
- t->ret = -E_TASK_KILLED;
- if (t->event_handler)
- t->event_handler(t);
+ t->error = -E_TASK_KILLED;
return 1;
}
list_for_each_entry_safe(t, tmp, &post_select_list, post_select_node) {
sprintf(buf, "%p", t);
if (strcmp(id, buf))
continue;
- t->ret = -E_TASK_KILLED;
- if (t->event_handler)
- t->event_handler(t);
+ t->error = -E_TASK_KILLED;
return 1;
}
return -E_NO_SUCH_TASK;
}
+
+/**
+ * Set the select timeout to the minimal possible value.
+ *
+ * \param s Pointer to the scheduler struct.
+ *
+ * This causes the next select() call to return immediately.
+ */
+void sched_min_delay(struct sched *s)
+{
+ s->timeout.tv_sec = 0;
+ s->timeout.tv_usec = 1;
+}
+
+/**
+ * Impose an upper bound for the timeout of the next select() call.
+ *
+ * \param timeout Maximal allowed timeout.
+ * \param s Pointer to the scheduler struct.
+ *
+ * If the current scheduler timeout is already smaller than \a timeout, this
+ * function does nothing. Otherwise the timeout for the next select() call is
+ * set to the given value.
+ *
+ * \sa sched_request_timeout_ms().
+ */
+void sched_request_timeout(struct timeval *timeout, struct sched *s)
+{
+ if (tv_diff(&s->timeout, timeout, NULL) > 0)
+ s->timeout = *timeout;
+}
+
+/**
+ * Force the next select() call to return before the given amount of milliseconds.
+ *
+ * \param ms The maximal allowed timeout in milliseconds.
+ * \param s Pointer to the scheduler struct.
+ *
+ * Like sched_request_timeout() this imposes an upper bound on the timeout
+ * value for the next select() call.
+ */
+void sched_request_timeout_ms(long unsigned ms, struct sched *s)
+{
+ struct timeval tv;
+ ms2tv(ms, &tv);
+ sched_request_timeout(&tv, s);
+}
+
+/**
+ * Force the next select() call to return before the given future time.
+ *
+ * \param barrier Absolute time before select() should return.
+ * \param s Pointer to the scheduler struct.
+ *
+ * If \a barrier is in the past, this function does nothing.
+ *
+ * \sa sched_request_barrier_or_min_delay().
+ */
+void sched_request_barrier(struct timeval *barrier, struct sched *s)
+{
+ struct timeval diff;
+
+ if (tv_diff(now, barrier, &diff) > 0)
+ return;
+ sched_request_timeout(&diff, s);
+}
+
+/**
+ * Force the next select() call to return before the given time.
+ *
+ * \param barrier Absolute time before select() should return.
+ * \param s Pointer to the scheduler struct.
+ *
+ * If \a barrier is in the past, this function requests a minimal timeout.
+ *
+ * \sa sched_min_delay(), sched_request_barrier().
+ */
+void sched_request_barrier_or_min_delay(struct timeval *barrier, struct sched *s)
+{
+ struct timeval diff;
+
+ if (tv_diff(now, barrier, &diff) > 0)
+ return sched_min_delay(s);
+ sched_request_timeout(&diff, s);
+}
projects / paraslash.git / blobdiff