130 lines
3.1 KiB
C
130 lines
3.1 KiB
C
/*
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include/proto/task.h
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Functions for task management.
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Copyright (C) 2000-2008 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 unsigned int run_queue; /* run queue size */
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extern unsigned int niced_tasks; /* number of niced tasks in the run queue */
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extern struct pool_head *pool2_task;
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/* perform minimal initializations, report 0 in case of error, 1 if OK. */
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int init_task();
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/* puts the task <t> in run queue <q>, and returns <t> */
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struct task *task_wakeup(struct task *t);
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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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t->state = TASK_IDLE;
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eb32_delete(&t->eb);
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run_queue--;
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if (likely(t->nice))
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niced_tasks--;
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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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* - run_queue
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* - wait queue
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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->eb.node.leaf_p)
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eb32_delete(&t->eb);
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if (t->state == TASK_RUNNING) {
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run_queue--;
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if (likely(t->nice))
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niced_tasks--;
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}
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return t;
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}
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/*
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* Initialize a new task. The bare minimum is performed (queue pointers and state).
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* The task is returned.
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*/
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static inline struct task *task_init(struct task *t)
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{
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t->eb.node.leaf_p = NULL;
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t->state = TASK_IDLE;
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t->nice = 0;
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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_free2(pool2_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 date of next event in <next> or eternity.
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*/
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void process_runnable_tasks(struct timeval *next);
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/*
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* Extract all expired timers from the timer queue, and wakes up all
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* associated tasks. Returns the date of next event (or eternity).
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*/
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void wake_expired_tasks(struct timeval *next);
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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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