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b0bdae7b88
Introduce tasklets, lightweight tasks. They have no notion of priority, they are just run as soon as possible, and will probably be used for I/O later. For the moment they're used to replace the temporary thread-local list that was used in the scheduler. The first part of the struct is common with tasks so that tasks can be cast to tasklets and queued in this list. Once a task is in the tasklet list, it has its leaf_p set to 0x1 so that it cannot accidently be confused as not in the queue. Pure tasklets are identifiable by their nice value of -32768 (which is normally not possible).
106 lines
4 KiB
C
106 lines
4 KiB
C
/*
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* include/types/task.h
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* Macros, variables and structures for task management.
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*
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* Copyright (C) 2000-2010 Willy Tarreau - w@1wt.eu
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*
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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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*
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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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*
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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 _TYPES_TASK_H
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#define _TYPES_TASK_H
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#include <sys/time.h>
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#include <common/config.h>
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#include <common/mini-clist.h>
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#include <eb32sctree.h>
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#include <eb32tree.h>
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/* values for task->state */
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#define TASK_SLEEPING 0x00 /* task sleeping */
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#define TASK_RUNNING 0x01 /* the task is currently running */
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#define TASK_WOKEN_INIT 0x02 /* woken up for initialisation purposes */
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#define TASK_WOKEN_TIMER 0x04 /* woken up because of expired timer */
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#define TASK_WOKEN_IO 0x08 /* woken up because of completed I/O */
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#define TASK_WOKEN_SIGNAL 0x10 /* woken up by a system signal */
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#define TASK_WOKEN_MSG 0x20 /* woken up by another task's message */
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#define TASK_WOKEN_RES 0x40 /* woken up because of available resource */
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#define TASK_WOKEN_OTHER 0x80 /* woken up for an unspecified reason */
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/* use this to check a task state or to clean it up before queueing */
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#define TASK_WOKEN_ANY (TASK_WOKEN_OTHER|TASK_WOKEN_INIT|TASK_WOKEN_TIMER| \
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TASK_WOKEN_IO|TASK_WOKEN_SIGNAL|TASK_WOKEN_MSG| \
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TASK_WOKEN_RES)
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/* Additional wakeup info may be passed in the state by lef-shifting the value
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* by this number of bits. Not more than 8 bits are guaranteed to be delivered.
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* System signals may use that too.
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*/
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#define TASK_REASON_SHIFT 8
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struct notification {
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struct list purge_me; /* Part of the list of signals to be purged in the
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case of the LUA execution stack crash. */
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struct list wake_me; /* Part of list of signals to be targeted if an
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event occurs. */
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struct task *task; /* The task to be wake if an event occurs. */
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__decl_hathreads(HA_SPINLOCK_T lock);
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};
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/* This part is common between struct task and struct tasklet so that tasks
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* can be used as-is as tasklets.
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*/
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#define TASK_COMMON \
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struct { \
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unsigned short state; /* task state : bitfield of TASK_ */ \
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short nice; /* task prio from -1024 to +1024, or -32768 for tasklets */ \
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unsigned int calls; /* number of times process was called */ \
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struct task *(*process)(struct task *t, void *ctx, unsigned short state); /* the function which processes the task */ \
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void *context; /* the task's context */ \
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}
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/* The base for all tasks */
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struct task {
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TASK_COMMON; /* must be at the beginning! */
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struct eb32sc_node rq; /* ebtree node used to hold the task in the run queue */
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struct eb32_node wq; /* ebtree node used to hold the task in the wait queue */
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int expire; /* next expiration date for this task, in ticks */
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unsigned long thread_mask; /* mask of thread IDs authorized to process the task */
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};
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/* lightweight tasks, without priority, mainly used for I/Os */
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struct tasklet {
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TASK_COMMON; /* must be at the beginning! */
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struct list list;
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};
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#define TASK_IS_TASKLET(t) ((t)->nice == -32768)
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/*
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* The task callback (->process) is responsible for updating ->expire. It must
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* return a pointer to the task itself, except if the task has been deleted, in
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* which case it returns NULL so that the scheduler knows it must not check the
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* expire timer. The scheduler will requeue the task at the proper location.
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*/
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#endif /* _TYPES_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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