+/*
+ * Copyright (C) 2006-2009 Andre Noll <maan@systemlinux.org>
+ *
+ * Licensed under the GPL v2. For licencing details see COPYING.
+ */
+
+/** \file sched.c Paraslash's scheduling functions. */
+
+#include <regex.h>
+#include <dirent.h> /* readdir() */
+#include <assert.h>
#include <sys/time.h>
+
#include "para.h"
#include "ipc.h"
#include "fd.h"
#include "string.h"
#include "error.h"
-struct list_head pre_select_list;
-struct list_head post_select_list;
+static struct list_head pre_select_list, post_select_list;
+static int initialized;
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);
}
}
-int sched(struct sched *s)
+/**
+ * The core function for all paraslash programs.
+ *
+ * \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
+ * the fd sets of \a s. Next, it calls para_select() and makes the result available
+ * to the registered tasks by calling their post_select hook.
+ *
+ * \return Zero if no more tasks are left in either of the two lists, negative
+ * if para_select returned an error.
+ *
+ * \sa task, now.
+ */
+int schedule(struct sched *s)
{
+ int ret;
+ if (!initialized)
+ return -E_NOT_INITIALIZED;
+ if (!s->select_function)
+ s->select_function = para_select;
gettimeofday(now, NULL);
again:
FD_ZERO(&s->rfds);
s->timeout = s->default_timeout;
s->max_fileno = -1;
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;
gettimeofday(now, NULL);
sched_post_select(s);
if (list_empty(&pre_select_list) && list_empty(&post_select_list))
goto again;
}
-void *register_task(struct task *t)
+/**
+ * Initialize the paraslash scheduler.
+ */
+static void init_sched(void)
{
+ 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.
+ *
+ * \param t the task to add
+ *
+ * If the pre_select pointer of \a t is not \p NULL, it is added to
+ * the pre_select list of the scheduler. Same goes for post_select.
+ *
+ * \sa task::pre_select, task::post_select
+ */
+void register_task(struct task *t)
+{
+ if (!initialized)
+ init_sched();
PARA_INFO_LOG("registering %s (%p)\n", t->status, t);
if (t->pre_select) {
PARA_DEBUG_LOG("pre_select: %p\n", &t->pre_select);
- 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);
- 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);
}
- return t;
}
-void unregister_task(struct task *t)
-{
- 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);
-};
-
-void init_sched(void)
-{
- INIT_LIST_HEAD(&pre_select_list);
- INIT_LIST_HEAD(&post_select_list);
-};
-
+/**
+ * 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.
+ */
void sched_shutdown(void)
{
struct task *t, *tmp;
+ if (!initialized)
+ 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.
+ *
+ * \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.
+ */
char *get_task_list(void)
{
struct task *t, *tmp;
char *msg = NULL;
+
+ if (!initialized)
+ return NULL;
list_for_each_entry_safe(t, tmp, &pre_select_list, pre_select_node) {
char *tmp_msg;
tmp_msg = make_message("%s%p\tpre\t%s\n", msg? msg : "", t, t->status);
return msg;
}
+/**
+ * Simulate an error for the given task.
+ *
+ * \param id The task identifier.
+ *
+ * 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).
+ */
int kill_task(char *id)
{
struct task *t, *tmp;
char buf[20];
+
+ if (!initialized)
+ return -E_NOT_INITIALIZED;
list_for_each_entry_safe(t, tmp, &pre_select_list, pre_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;
}
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;
projects / paraslash.git / blobdiff