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f0cea1ee3f
By removing the reason code for the wakeup we can gain 8 extra bits to encode the task's state. The reason code was never used at all and is wrong by design since subsequent calls will OR this value anyway. Let's say it goodbye and leave the room for more precious bits. The woken bits were moved to the higher byte so that the most important bits can stay grouped together.
101 lines
3.8 KiB
C
101 lines
3.8 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 0x0000 /* task sleeping */
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#define TASK_RUNNING 0x0001 /* the task is currently running */
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#define TASK_WOKEN_INIT 0x0100 /* woken up for initialisation purposes */
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#define TASK_WOKEN_TIMER 0x0200 /* woken up because of expired timer */
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#define TASK_WOKEN_IO 0x0400 /* woken up because of completed I/O */
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#define TASK_WOKEN_SIGNAL 0x0800 /* woken up by a system signal */
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#define TASK_WOKEN_MSG 0x1000 /* woken up by another task's message */
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#define TASK_WOKEN_RES 0x2000 /* woken up because of available resource */
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#define TASK_WOKEN_OTHER 0x4000 /* 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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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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