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130 lines
2.9 KiB
C
130 lines
2.9 KiB
C
/*
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include/proto/task.h
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Functions for task management.
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Copyright (C) 2000-2007 Willy Tarreau - w@1wt.eu
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation, version 2.1
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exclusively.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _PROTO_TASK_H
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#define _PROTO_TASK_H
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#include <sys/time.h>
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#include <common/config.h>
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#include <common/memory.h>
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#include <common/mini-clist.h>
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#include <common/standard.h>
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#include <types/task.h>
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extern void *run_queue;
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/* needed later */
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void *tree_delete(void *node);
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/* puts the task <t> in run queue <q>, and returns <t> */
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#define task_wakeup _task_wakeup
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struct task *_task_wakeup(struct task *t);
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static inline struct task *__task_wakeup(struct task *t)
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{
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if (t->state == TASK_RUNNING)
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return t;
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if (t->qlist.p != NULL)
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DLIST_DEL(&t->qlist);
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DLIST_ADD(run_queue, &t->qlist);
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t->state = TASK_RUNNING;
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if (likely(t->wq)) {
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tree_delete(t->wq);
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t->wq = NULL;
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}
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return t;
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}
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/* removes the task <t> from the run queue if it was in it.
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* returns <t>.
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*/
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static inline struct task *task_sleep(struct task *t)
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{
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if (t->state == TASK_RUNNING) {
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DLIST_DEL(&t->qlist);
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t->qlist.p = NULL;
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t->state = TASK_IDLE;
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}
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return t;
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}
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/*
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* unlinks the task from wherever it is queued :
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* - eternity_queue, run_queue
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* - wait queue : wq not null => remove carrier node too
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* A pointer to the task itself is returned.
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*/
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static inline struct task *task_delete(struct task *t)
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{
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if (t->qlist.p != NULL) {
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DLIST_DEL(&t->qlist);
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t->qlist.p = NULL;
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}
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if (t->wq) {
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tree_delete(t->wq);
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t->wq = NULL;
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}
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return t;
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}
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/*
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* frees a task. Its context must have been freed since it will be lost.
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*/
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static inline void task_free(struct task *t)
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{
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pool_free(task, t);
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}
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/* inserts <task> into its assigned wait queue, where it may already be. In this case, it
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* may be only moved or left where it was, depending on its timing requirements.
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* <task> is returned.
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*/
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struct task *task_queue(struct task *task);
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/*
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* This does 4 things :
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* - wake up all expired tasks
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* - call all runnable tasks
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* - call maintain_proxies() to enable/disable the listeners
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* - return the delay till next event in ms, -1 = wait indefinitely
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* Note: this part should be rewritten with the O(ln(n)) scheduler.
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*
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*/
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int process_runnable_tasks();
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#endif /* _PROTO_TASK_H */
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/*
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* Local variables:
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* c-indent-level: 8
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* c-basic-offset: 8
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* End:
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*/
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