mirror of
https://git.rtems.org/rtems-libbsd/
synced 2025-07-23 08:22:52 +08:00
TASKQUEUE(9): Use FreeBSD implementation
This commit is contained in:
Sebastian Huber
parent
795c5e6610
commit
ea87228a26
2
Makefile
2
Makefile
@ -83,7 +83,6 @@ LIB_C_FILES += rtemsbsd/rtems/rtems-bsd-syscall-api.c
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LIB_C_FILES += rtemsbsd/rtems/rtems-bsd-sysctlbyname.c
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LIB_C_FILES += rtemsbsd/rtems/rtems-bsd-sysctl.c
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LIB_C_FILES += rtemsbsd/rtems/rtems-bsd-sysctlnametomib.c
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LIB_C_FILES += rtemsbsd/rtems/rtems-bsd-taskqueue.c
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LIB_C_FILES += rtemsbsd/rtems/rtems-bsd-thread.c
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LIB_C_FILES += rtemsbsd/rtems/rtems-bsd-timesupport.c
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LIB_C_FILES += rtemsbsd/rtems/rtems-kvm.c
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@ -144,6 +143,7 @@ LIB_C_FILES += freebsd/sys/kern/subr_kobj.c
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LIB_C_FILES += freebsd/sys/kern/subr_module.c
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LIB_C_FILES += freebsd/sys/kern/subr_rman.c
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LIB_C_FILES += freebsd/sys/kern/subr_sbuf.c
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LIB_C_FILES += freebsd/sys/kern/subr_taskqueue.c
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LIB_C_FILES += freebsd/sys/kern/subr_unit.c
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LIB_C_FILES += freebsd/sys/kern/sys_generic.c
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LIB_C_FILES += freebsd/sys/kern/uipc_accf.c
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@ -640,7 +640,6 @@ rtems.addRTEMSSourceFiles(
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'rtems/rtems-bsd-sysctlbyname.c',
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'rtems/rtems-bsd-sysctl.c',
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'rtems/rtems-bsd-sysctlnametomib.c',
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'rtems/rtems-bsd-taskqueue.c',
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'rtems/rtems-bsd-thread.c',
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'rtems/rtems-bsd-timesupport.c',
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'rtems/rtems-kvm.c',
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@ -804,6 +803,7 @@ base.addSourceFiles(
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'sys/kern/subr_module.c',
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'sys/kern/subr_rman.c',
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'sys/kern/subr_sbuf.c',
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'sys/kern/subr_taskqueue.c',
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'sys/kern/subr_unit.c',
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'sys/kern/sys_generic.c',
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'sys/kern/uipc_accf.c',
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@ -1175,7 +1175,6 @@ devNet.addSourceFiles(
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devNic = Module('dev_nic')
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devNic.addHeaderFiles(
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[
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# 'sys/taskqueue.h',
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'sys/sys/pciio.h',
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'sys/dev/random/randomdev_soft.h',
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'sys/sys/eventvar.h',
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509
freebsd/sys/kern/subr_taskqueue.c
Normal file
509
freebsd/sys/kern/subr_taskqueue.c
Normal file
@ -0,0 +1,509 @@
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#include <machine/rtems-bsd-config.h>
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/*-
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* Copyright (c) 2000 Doug Rabson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <rtems/bsd/sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/interrupt.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <rtems/bsd/sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/sched.h>
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#include <sys/taskqueue.h>
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#include <rtems/bsd/sys/unistd.h>
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#include <machine/stdarg.h>
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static MALLOC_DEFINE(M_TASKQUEUE, "taskqueue", "Task Queues");
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#ifndef __rtems__
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static void *taskqueue_giant_ih;
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#endif /* __rtems__ */
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static void *taskqueue_ih;
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struct taskqueue_busy {
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struct task *tb_running;
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TAILQ_ENTRY(taskqueue_busy) tb_link;
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};
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struct taskqueue {
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STAILQ_HEAD(, task) tq_queue;
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const char *tq_name;
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taskqueue_enqueue_fn tq_enqueue;
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void *tq_context;
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TAILQ_HEAD(, taskqueue_busy) tq_active;
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struct mtx tq_mutex;
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struct thread **tq_threads;
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int tq_tcount;
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#ifndef __rtems__
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int tq_spin;
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#endif /* __rtems__ */
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int tq_flags;
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};
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#define TQ_FLAGS_ACTIVE (1 << 0)
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#define TQ_FLAGS_BLOCKED (1 << 1)
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#define TQ_FLAGS_PENDING (1 << 2)
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static void taskqueue_run_locked(struct taskqueue *);
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static __inline void
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TQ_LOCK(struct taskqueue *tq)
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{
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#ifndef __rtems__
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if (tq->tq_spin)
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mtx_lock_spin(&tq->tq_mutex);
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else
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#endif /* __rtems__ */
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mtx_lock(&tq->tq_mutex);
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}
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static __inline void
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TQ_UNLOCK(struct taskqueue *tq)
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{
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#ifndef __rtems__
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if (tq->tq_spin)
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mtx_unlock_spin(&tq->tq_mutex);
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else
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#endif /* __rtems__ */
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mtx_unlock(&tq->tq_mutex);
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}
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static __inline int
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TQ_SLEEP(struct taskqueue *tq, void *p, struct mtx *m, int pri, const char *wm,
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int t)
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{
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#ifndef __rtems__
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if (tq->tq_spin)
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return (msleep_spin(p, m, wm, t));
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#endif /* __rtems__ */
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return (msleep(p, m, pri, wm, t));
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}
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static struct taskqueue *
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_taskqueue_create(const char *name, int mflags,
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taskqueue_enqueue_fn enqueue, void *context,
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int mtxflags, const char *mtxname)
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{
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struct taskqueue *queue;
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queue = malloc(sizeof(struct taskqueue), M_TASKQUEUE, mflags | M_ZERO);
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if (!queue)
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return NULL;
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STAILQ_INIT(&queue->tq_queue);
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TAILQ_INIT(&queue->tq_active);
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queue->tq_name = name;
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queue->tq_enqueue = enqueue;
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queue->tq_context = context;
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#ifndef __rtems__
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queue->tq_spin = (mtxflags & MTX_SPIN) != 0;
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#else /* __rtems__ */
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/*
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* FIXME: Here is a potential performance optimization. Maybe also an
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* issue for correctness.
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*/
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#endif /* __rtems__ */
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queue->tq_flags |= TQ_FLAGS_ACTIVE;
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mtx_init(&queue->tq_mutex, mtxname, NULL, mtxflags);
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return queue;
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}
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struct taskqueue *
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taskqueue_create(const char *name, int mflags,
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taskqueue_enqueue_fn enqueue, void *context)
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{
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return _taskqueue_create(name, mflags, enqueue, context,
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MTX_DEF, "taskqueue");
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}
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/*
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* Signal a taskqueue thread to terminate.
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*/
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static void
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taskqueue_terminate(struct thread **pp, struct taskqueue *tq)
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{
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while (tq->tq_tcount > 0) {
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wakeup(tq);
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TQ_SLEEP(tq, pp, &tq->tq_mutex, PWAIT, "taskqueue_destroy", 0);
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}
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}
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void
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taskqueue_free(struct taskqueue *queue)
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{
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TQ_LOCK(queue);
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queue->tq_flags &= ~TQ_FLAGS_ACTIVE;
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taskqueue_run_locked(queue);
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taskqueue_terminate(queue->tq_threads, queue);
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KASSERT(TAILQ_EMPTY(&queue->tq_active), ("Tasks still running?"));
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mtx_destroy(&queue->tq_mutex);
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free(queue->tq_threads, M_TASKQUEUE);
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free(queue, M_TASKQUEUE);
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}
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int
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taskqueue_enqueue(struct taskqueue *queue, struct task *task)
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{
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struct task *ins;
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struct task *prev;
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TQ_LOCK(queue);
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/*
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* Count multiple enqueues.
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*/
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if (task->ta_pending) {
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task->ta_pending++;
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TQ_UNLOCK(queue);
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return 0;
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}
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/*
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* Optimise the case when all tasks have the same priority.
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*/
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prev = STAILQ_LAST(&queue->tq_queue, task, ta_link);
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if (!prev || prev->ta_priority >= task->ta_priority) {
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STAILQ_INSERT_TAIL(&queue->tq_queue, task, ta_link);
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} else {
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prev = NULL;
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for (ins = STAILQ_FIRST(&queue->tq_queue); ins;
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prev = ins, ins = STAILQ_NEXT(ins, ta_link))
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if (ins->ta_priority < task->ta_priority)
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break;
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if (prev)
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STAILQ_INSERT_AFTER(&queue->tq_queue, prev, task, ta_link);
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else
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STAILQ_INSERT_HEAD(&queue->tq_queue, task, ta_link);
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}
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task->ta_pending = 1;
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if ((queue->tq_flags & TQ_FLAGS_BLOCKED) == 0)
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queue->tq_enqueue(queue->tq_context);
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else
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queue->tq_flags |= TQ_FLAGS_PENDING;
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TQ_UNLOCK(queue);
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return 0;
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}
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void
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taskqueue_block(struct taskqueue *queue)
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{
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TQ_LOCK(queue);
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queue->tq_flags |= TQ_FLAGS_BLOCKED;
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TQ_UNLOCK(queue);
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}
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void
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taskqueue_unblock(struct taskqueue *queue)
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{
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TQ_LOCK(queue);
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queue->tq_flags &= ~TQ_FLAGS_BLOCKED;
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if (queue->tq_flags & TQ_FLAGS_PENDING) {
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queue->tq_flags &= ~TQ_FLAGS_PENDING;
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queue->tq_enqueue(queue->tq_context);
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}
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TQ_UNLOCK(queue);
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}
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static void
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taskqueue_run_locked(struct taskqueue *queue)
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{
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struct taskqueue_busy tb;
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struct task *task;
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int pending;
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mtx_assert(&queue->tq_mutex, MA_OWNED);
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tb.tb_running = NULL;
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TAILQ_INSERT_TAIL(&queue->tq_active, &tb, tb_link);
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while (STAILQ_FIRST(&queue->tq_queue)) {
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/*
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* Carefully remove the first task from the queue and
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* zero its pending count.
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*/
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task = STAILQ_FIRST(&queue->tq_queue);
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STAILQ_REMOVE_HEAD(&queue->tq_queue, ta_link);
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pending = task->ta_pending;
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task->ta_pending = 0;
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tb.tb_running = task;
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TQ_UNLOCK(queue);
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task->ta_func(task->ta_context, pending);
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TQ_LOCK(queue);
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tb.tb_running = NULL;
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wakeup(task);
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}
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TAILQ_REMOVE(&queue->tq_active, &tb, tb_link);
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}
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void
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taskqueue_run(struct taskqueue *queue)
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{
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TQ_LOCK(queue);
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taskqueue_run_locked(queue);
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TQ_UNLOCK(queue);
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}
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static int
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task_is_running(struct taskqueue *queue, struct task *task)
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{
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struct taskqueue_busy *tb;
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mtx_assert(&queue->tq_mutex, MA_OWNED);
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TAILQ_FOREACH(tb, &queue->tq_active, tb_link) {
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if (tb->tb_running == task)
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return (1);
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}
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return (0);
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}
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void
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taskqueue_drain(struct taskqueue *queue, struct task *task)
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{
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#ifndef __rtems__
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if (queue->tq_spin) { /* XXX */
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mtx_lock_spin(&queue->tq_mutex);
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while (task->ta_pending != 0 || task_is_running(queue, task))
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msleep_spin(task, &queue->tq_mutex, "-", 0);
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mtx_unlock_spin(&queue->tq_mutex);
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} else {
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#endif /* __rtems__ */
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WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, __func__);
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mtx_lock(&queue->tq_mutex);
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while (task->ta_pending != 0 || task_is_running(queue, task))
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msleep(task, &queue->tq_mutex, PWAIT, "-", 0);
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mtx_unlock(&queue->tq_mutex);
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#ifndef __rtems__
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}
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#endif /* __rtems__ */
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}
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static void
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taskqueue_swi_enqueue(void *context)
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{
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swi_sched(taskqueue_ih, 0);
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}
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static void
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taskqueue_swi_run(void *dummy)
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{
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taskqueue_run(taskqueue_swi);
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}
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#ifndef __rtems__
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static void
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taskqueue_swi_giant_enqueue(void *context)
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{
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swi_sched(taskqueue_giant_ih, 0);
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}
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static void
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taskqueue_swi_giant_run(void *dummy)
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{
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taskqueue_run(taskqueue_swi_giant);
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}
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#endif /* __rtems__ */
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int
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taskqueue_start_threads(struct taskqueue **tqp, int count, int pri,
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const char *name, ...)
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{
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va_list ap;
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struct thread *td;
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struct taskqueue *tq;
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int i, error;
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char ktname[MAXCOMLEN + 1];
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if (count <= 0)
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return (EINVAL);
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tq = *tqp;
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va_start(ap, name);
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vsnprintf(ktname, sizeof(ktname), name, ap);
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va_end(ap);
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tq->tq_threads = malloc(sizeof(struct thread *) * count, M_TASKQUEUE,
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M_NOWAIT | M_ZERO);
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if (tq->tq_threads == NULL) {
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printf("%s: no memory for %s threads\n", __func__, ktname);
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return (ENOMEM);
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}
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for (i = 0; i < count; i++) {
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if (count == 1)
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error = kthread_add(taskqueue_thread_loop, tqp, NULL,
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&tq->tq_threads[i], RFSTOPPED, 0, "%s", ktname);
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else
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error = kthread_add(taskqueue_thread_loop, tqp, NULL,
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&tq->tq_threads[i], RFSTOPPED, 0,
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"%s_%d", ktname, i);
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if (error) {
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/* should be ok to continue, taskqueue_free will dtrt */
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printf("%s: kthread_add(%s): error %d", __func__,
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ktname, error);
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tq->tq_threads[i] = NULL; /* paranoid */
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} else
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tq->tq_tcount++;
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}
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#ifndef __rtems__
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for (i = 0; i < count; i++) {
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if (tq->tq_threads[i] == NULL)
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continue;
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td = tq->tq_threads[i];
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thread_lock(td);
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sched_prio(td, pri);
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sched_add(td, SRQ_BORING);
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thread_unlock(td);
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}
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#else /* __rtems__ */
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(void) td;
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#endif /* __rtems__ */
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return (0);
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}
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void
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taskqueue_thread_loop(void *arg)
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{
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struct taskqueue **tqp, *tq;
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tqp = arg;
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tq = *tqp;
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TQ_LOCK(tq);
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while ((tq->tq_flags & TQ_FLAGS_ACTIVE) != 0) {
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taskqueue_run_locked(tq);
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/*
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* Because taskqueue_run() can drop tq_mutex, we need to
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* check if the TQ_FLAGS_ACTIVE flag wasn't removed in the
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* meantime, which means we missed a wakeup.
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*/
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if ((tq->tq_flags & TQ_FLAGS_ACTIVE) == 0)
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break;
|
||||
TQ_SLEEP(tq, tq, &tq->tq_mutex, 0, "-", 0);
|
||||
}
|
||||
|
||||
/* rendezvous with thread that asked us to terminate */
|
||||
tq->tq_tcount--;
|
||||
wakeup_one(tq->tq_threads);
|
||||
TQ_UNLOCK(tq);
|
||||
kthread_exit();
|
||||
}
|
||||
|
||||
void
|
||||
taskqueue_thread_enqueue(void *context)
|
||||
{
|
||||
struct taskqueue **tqp, *tq;
|
||||
|
||||
tqp = context;
|
||||
tq = *tqp;
|
||||
|
||||
mtx_assert(&tq->tq_mutex, MA_OWNED);
|
||||
wakeup_one(tq);
|
||||
}
|
||||
|
||||
TASKQUEUE_DEFINE(swi, taskqueue_swi_enqueue, NULL,
|
||||
swi_add(NULL, "task queue", taskqueue_swi_run, NULL, SWI_TQ,
|
||||
INTR_MPSAFE, &taskqueue_ih));
|
||||
|
||||
#ifndef __rtems__
|
||||
TASKQUEUE_DEFINE(swi_giant, taskqueue_swi_giant_enqueue, NULL,
|
||||
swi_add(NULL, "Giant taskq", taskqueue_swi_giant_run,
|
||||
NULL, SWI_TQ_GIANT, 0, &taskqueue_giant_ih));
|
||||
#endif /* __rtems__ */
|
||||
|
||||
TASKQUEUE_DEFINE_THREAD(thread);
|
||||
|
||||
struct taskqueue *
|
||||
taskqueue_create_fast(const char *name, int mflags,
|
||||
taskqueue_enqueue_fn enqueue, void *context)
|
||||
{
|
||||
return _taskqueue_create(name, mflags, enqueue, context,
|
||||
MTX_SPIN, "fast_taskqueue");
|
||||
}
|
||||
|
||||
/* NB: for backwards compatibility */
|
||||
int
|
||||
taskqueue_enqueue_fast(struct taskqueue *queue, struct task *task)
|
||||
{
|
||||
return taskqueue_enqueue(queue, task);
|
||||
}
|
||||
|
||||
static void *taskqueue_fast_ih;
|
||||
|
||||
static void
|
||||
taskqueue_fast_enqueue(void *context)
|
||||
{
|
||||
swi_sched(taskqueue_fast_ih, 0);
|
||||
}
|
||||
|
||||
static void
|
||||
taskqueue_fast_run(void *dummy)
|
||||
{
|
||||
taskqueue_run(taskqueue_fast);
|
||||
}
|
||||
|
||||
TASKQUEUE_FAST_DEFINE(fast, taskqueue_fast_enqueue, NULL,
|
||||
swi_add(NULL, "Fast task queue", taskqueue_fast_run, NULL,
|
||||
SWI_TQ_FAST, INTR_MPSAFE, &taskqueue_fast_ih));
|
||||
|
||||
int
|
||||
taskqueue_member(struct taskqueue *queue, struct thread *td)
|
||||
{
|
||||
int i, j, ret = 0;
|
||||
|
||||
TQ_LOCK(queue);
|
||||
for (i = 0, j = 0; ; i++) {
|
||||
if (queue->tq_threads[i] == NULL)
|
||||
continue;
|
||||
if (queue->tq_threads[i] == td) {
|
||||
ret = 1;
|
||||
break;
|
||||
}
|
||||
if (++j >= queue->tq_tcount)
|
||||
break;
|
||||
}
|
||||
TQ_UNLOCK(queue);
|
||||
return (ret);
|
||||
}
|
||||
@ -92,7 +92,9 @@ the current Git submodule commit is this
|
||||
* get_cyclecount(): The implementation is a security problem.
|
||||
|
||||
* What to do with the priority parameter present in the FreeBSD synchronization
|
||||
primitives?
|
||||
primitives and the thread creation functions?
|
||||
|
||||
* TASKQUEUE(9): Support spin mutexes.
|
||||
|
||||
* ZONE(9): Review allocator lock usage in rtems-bsd-chunk.c.
|
||||
|
||||
|
||||
@ -1,349 +0,0 @@
|
||||
/**
|
||||
* @file
|
||||
*
|
||||
* @ingroup rtems_bsd_rtems
|
||||
*
|
||||
* @brief TODO.
|
||||
*/
|
||||
|
||||
/*
|
||||
* COPYRIGHT (c) 2012.
|
||||
* On-Line Applications Research Corporation (OAR).
|
||||
* All Rights Reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*/
|
||||
|
||||
#include <sys/cdefs.h>
|
||||
__FBSDID("$FreeBSD$");
|
||||
|
||||
#include <rtems.h>
|
||||
#include <rtems/error.h>
|
||||
#include <machine/rtems-bsd-taskqueue.h>
|
||||
|
||||
/*
|
||||
#define STATIC static
|
||||
*/
|
||||
#undef DEBUG
|
||||
|
||||
#ifdef DEBUG
|
||||
#include <stdio.h>
|
||||
#ifndef STATIC
|
||||
#define STATIC
|
||||
#endif
|
||||
#else
|
||||
#ifndef STATIC
|
||||
#define STATIC static
|
||||
#endif
|
||||
#endif
|
||||
|
||||
#define TQ_WAKE_EVENT RTEMS_EVENT_0
|
||||
|
||||
/* This implementation is extremely simple; we assume
|
||||
* that all taskqueues (and as a matter of fact there is
|
||||
* only a single one) are manipulated with the rtems
|
||||
* bsdnet semaphore held. I.e.,
|
||||
* taskqueue_enqueue()
|
||||
* taskqueue_drain()
|
||||
* etc.
|
||||
* are called from an environment that holds the
|
||||
* bsdnet semaphore.
|
||||
* Likewise, the thread that works the taskqueue
|
||||
* holds the semaphore while doing so.
|
||||
*
|
||||
*/
|
||||
|
||||
/* use single-linked list; 'drain' which would benefit from
|
||||
* double-linked list is seldom used and performance doesn't
|
||||
* matter much there. OTOH, the frequent case of working
|
||||
* the list + enqueueing is more efficient for the single-linked
|
||||
* list.
|
||||
struct task {
|
||||
struct task *ta_next;
|
||||
int ta_pending;
|
||||
int ta_priority;
|
||||
task_fn ta_fn;
|
||||
void *ta_fn_arg;
|
||||
};
|
||||
*/
|
||||
|
||||
struct taskqueue {
|
||||
struct task anchor;
|
||||
struct task *tail;
|
||||
tq_enq_fn enq_fn;
|
||||
void *enq_fn_arg;
|
||||
rtems_id tid;
|
||||
};
|
||||
|
||||
|
||||
STATIC struct taskqueue the_taskqueue = {
|
||||
{ 0, 0, 0, 0, 0 },
|
||||
&the_taskqueue.anchor,
|
||||
taskqueue_thread_enqueue,
|
||||
&taskqueue_fast,
|
||||
0
|
||||
};
|
||||
|
||||
struct taskqueue *taskqueue_fast = &the_taskqueue;
|
||||
struct taskqueue *taskqueue_swi = NULL;
|
||||
|
||||
struct taskqueue *
|
||||
taskqueue_create(const char *name, int mflags, tq_enq_fn enq_fn, void *arg)
|
||||
{
|
||||
if ( enq_fn != taskqueue_thread_enqueue )
|
||||
rtems_panic("rtems_taskqueue: attempt to create non-standard TQ; implementation needs to be modified\n");
|
||||
return &the_taskqueue;
|
||||
}
|
||||
|
||||
struct taskqueue *
|
||||
taskqueue_create_fast(const char *name, int mflags, tq_enq_fn enq_fn, void *arg)
|
||||
{
|
||||
return taskqueue_create(name, mflags, enq_fn, arg);
|
||||
}
|
||||
|
||||
/* taskqueue_enqueue must be allowed from an ISR;
|
||||
* hence, all critical list manipulation must lock out
|
||||
* interrupts...
|
||||
*/
|
||||
int
|
||||
taskqueue_enqueue(struct taskqueue *tq, struct task *ta)
|
||||
{
|
||||
rtems_interrupt_level l;
|
||||
|
||||
rtems_interrupt_disable(l);
|
||||
if ( 0 == ta->ta_pending ++ ) {
|
||||
/* hook into list */
|
||||
ta->ta_next = 0;
|
||||
tq->tail->ta_next = ta;
|
||||
tq->tail = ta;
|
||||
}
|
||||
tq->enq_fn(tq->enq_fn_arg);
|
||||
rtems_interrupt_enable(l);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int
|
||||
taskqueue_enqueue_fast(struct taskqueue *queue, struct task *task)
|
||||
{
|
||||
return taskqueue_enqueue(queue, task);
|
||||
}
|
||||
|
||||
void
|
||||
taskqueue_thread_enqueue(void *ctxt)
|
||||
{
|
||||
int dopost;
|
||||
/* pointer-to-pointer is what bsd provides; we currently
|
||||
* follow the scheme even we don't directly use the argument
|
||||
* passed to taskqueue_create...
|
||||
*/
|
||||
struct taskqueue *tq = *(struct taskqueue **)ctxt;
|
||||
/* If this is the first entry on the list then the
|
||||
* task needs to be notified...
|
||||
*/
|
||||
dopost = ( tq->anchor.ta_next == tq->tail && 1 == tq->tail->ta_pending );
|
||||
|
||||
if ( dopost )
|
||||
rtems_event_send(tq->tid, TQ_WAKE_EVENT);
|
||||
}
|
||||
|
||||
/* Returns 0 on success */
|
||||
int
|
||||
taskqueue_start_threads(struct taskqueue **ptq, int count, int prio, const char *fmt, ...)
|
||||
{
|
||||
if ( count != 1 )
|
||||
rtems_panic("rtems_taskqueue: taskqueue_start_threads cannot currently deal with count != 1\n");
|
||||
|
||||
/* Do (non thread-safe) lazy init as a fallback */
|
||||
if ( ! the_taskqueue.tid )
|
||||
rtems_taskqueue_initialize();
|
||||
return 0;
|
||||
}
|
||||
|
||||
void
|
||||
taskqueue_drain(struct taskqueue *tq, struct task *ta)
|
||||
{
|
||||
rtems_interrupt_level l;
|
||||
struct task *p, *q;
|
||||
int i;
|
||||
|
||||
/* find predecessor; searching the list should be
|
||||
* safe; an ISR might append a new record to the tail
|
||||
* while we are working but that should be OK.
|
||||
*/
|
||||
for ( p = &tq->anchor; (q = p->ta_next); p=q ) {
|
||||
if ( q == ta ) {
|
||||
rtems_interrupt_disable(l);
|
||||
/* found; do work */
|
||||
/* remember 'pending' count and extract */
|
||||
i = ta->ta_pending;
|
||||
ta->ta_pending = 0;
|
||||
p->ta_next = ta->ta_next;
|
||||
ta->ta_next = 0;
|
||||
/* adjust tail */
|
||||
if ( tq->tail == q )
|
||||
tq->tail = p;
|
||||
rtems_interrupt_enable(l);
|
||||
for ( ; i>0; i-- ) {
|
||||
ta->ta_fn(ta->ta_fn_arg, i);
|
||||
}
|
||||
return;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* work the task queue and return
|
||||
* nonzero if the list is not empty
|
||||
* (which means that some callback has
|
||||
* rescheduled itself)
|
||||
*/
|
||||
static void *
|
||||
taskqueue_work(struct taskqueue *tq)
|
||||
{
|
||||
rtems_interrupt_level l;
|
||||
struct task *p, *q;
|
||||
task_fn f;
|
||||
void *arg;
|
||||
int i;
|
||||
|
||||
/* work off a temporary list in case any callback reschedules
|
||||
* itself or if new tasks are queued from an ISR.
|
||||
*/
|
||||
rtems_interrupt_disable(l);
|
||||
p = tq->anchor.ta_next;
|
||||
|
||||
tq->anchor.ta_next = 0;
|
||||
tq->tail = &tq->anchor;
|
||||
rtems_interrupt_enable(l);
|
||||
|
||||
while ( (q=p) ) {
|
||||
rtems_interrupt_disable(l);
|
||||
i = q->ta_pending;
|
||||
q->ta_pending = 0;
|
||||
/* extract */
|
||||
p = q->ta_next;
|
||||
q->ta_next = 0;
|
||||
f = q->ta_fn;
|
||||
arg = q->ta_fn_arg;
|
||||
rtems_interrupt_enable(l);
|
||||
for ( ; i>0; i-- ) {
|
||||
f(arg, i);
|
||||
}
|
||||
}
|
||||
return tq->anchor.ta_next;
|
||||
}
|
||||
|
||||
void
|
||||
taskqueue_free(struct taskqueue *tq)
|
||||
{
|
||||
taskqueue_work(tq);
|
||||
}
|
||||
|
||||
static void
|
||||
taskqueueDoWork(void *arg)
|
||||
{
|
||||
struct taskqueue *tq = arg;
|
||||
rtems_event_set evs;
|
||||
rtems_status_code sc;
|
||||
while ( 1 ) {
|
||||
sc = rtems_event_receive(TQ_WAKE_EVENT, RTEMS_EVENT_ANY | RTEMS_WAIT, RTEMS_NO_TIMEOUT, &evs);
|
||||
if ( RTEMS_SUCCESSFUL != sc ) {
|
||||
rtems_error(sc,"rtems_taskqueue: taskqueueDoWork() unable to receive wakup event\n");
|
||||
rtems_panic("Can't proceed\n");
|
||||
}
|
||||
if ( taskqueue_work(tq) ) {
|
||||
#if 0
|
||||
/* chance to reschedule */
|
||||
rtems_bsdnet_semaphore_release();
|
||||
rtems_task_wake_after(0);
|
||||
rtems_bsdnet_semaphore_obtain();
|
||||
#else
|
||||
/* hopefully, releasing the semaphore (as part of bsdnet_event_receive)
|
||||
* and obtaining the event (which has been posted already)
|
||||
* yields the CPU if necessary...
|
||||
*/
|
||||
#endif
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#ifdef DEBUG
|
||||
struct task_dbg {
|
||||
struct task t;
|
||||
char *nm;
|
||||
};
|
||||
|
||||
struct task_dbg taskA = {
|
||||
{0},
|
||||
"taskA"
|
||||
};
|
||||
|
||||
struct task_dbg taskB = {
|
||||
{0},
|
||||
"taskB"
|
||||
};
|
||||
|
||||
struct task_dbg taskC = {
|
||||
{0},
|
||||
"taskC"
|
||||
};
|
||||
|
||||
static void the_task_fn(void *arg, int pending)
|
||||
{
|
||||
struct task_dbg *td = arg;
|
||||
printf("%s (pending: %i)\n", td->nm, pending);
|
||||
/* Test rescheduling */
|
||||
if ( pending > 3 )
|
||||
taskqueue_enqueue(&the_taskqueue,&td->t);
|
||||
}
|
||||
|
||||
void taskqueue_dump()
|
||||
{
|
||||
struct task *p;
|
||||
printf("Anchor %p, Tail %p\n", &the_taskqueue.anchor, the_taskqueue.tail);
|
||||
for ( p = the_taskqueue.anchor.ta_next; p; p=p->ta_next ) {
|
||||
printf("%p: (pending %2i, next %p)\n",
|
||||
p, p->ta_pending, p->ta_next);
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
rtems_id
|
||||
rtems_taskqueue_initialize()
|
||||
{
|
||||
#ifdef DEBUG
|
||||
TASK_INIT( &taskA.t, 0, the_task_fn, &taskA );
|
||||
TASK_INIT( &taskB.t, 0, the_task_fn, &taskB );
|
||||
TASK_INIT( &taskC.t, 0, the_task_fn, &taskC );
|
||||
#endif
|
||||
if ( ! the_taskqueue.tid )
|
||||
the_taskqueue.tid = rtems_bsdnet_newproc("tskq", 10000, taskqueueDoWork, &the_taskqueue);
|
||||
return the_taskqueue.tid;
|
||||
}
|
||||
|
||||
#ifdef DEBUG
|
||||
void
|
||||
_cexpModuleInitialize(void *u)
|
||||
{
|
||||
rtems_bsdnet_initialize_network();
|
||||
the_taskqueue.tid = rtems_taskqueue_initialize();
|
||||
}
|
||||
#endif
|
||||
Loading…
x
Reference in New Issue
Block a user