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This macro should be used to declare variables or struct members depending on the USE_THREAD compile option. It avoids the encapsulation of such declarations between #ifdef/#endif. It is used to declare all lock variables.
91 lines
3.7 KiB
C
91 lines
3.7 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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/* The base for all tasks */
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struct task {
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struct eb32sc_node rq; /* ebtree node used to hold the task in the run queue */
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unsigned short state; /* task state : bit field of TASK_* */
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unsigned short pending_state; /* pending states for running talk */
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short nice; /* the task's current nice value from -1024 to +1024 */
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unsigned int calls; /* number of times ->process() was called */
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struct task * (*process)(struct task *t); /* the function which processes the task */
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void *context; /* the task's context */
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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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/*
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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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