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007ddf7e7a
have been unified with that of msleep(9), further refine the sleepq interface and consolidate some duplicated code: - Move the pre-sleep checks for theaded processes into a thread_sleep_check() function in kern_thread.c. - Move all handling of TDF_SINTR to be internal to subr_sleepqueue.c. Specifically, if a thread is awakened by something other than a signal while checking for signals before going to sleep, clear TDF_SINTR in sleepq_catch_signals(). This removes a sched_lock lock/unlock combo in that edge case during an interruptible sleep. Also, fix sleepq_check_signals() to properly handle the condition if TDF_SINTR is clear rather than requiring the callers of the sleepq API to notice this edge case and call a non-_sig variant of sleepq_wait(). - Clarify the flags arguments to sleepq_add(), sleepq_signal() and sleepq_broadcast() by creating an explicit submask for sleepq types. Also, add an explicit SLEEPQ_MSLEEP type rather than a magic number of 0. Also, add a SLEEPQ_INTERRUPTIBLE flag for use with sleepq_add() and move the setting of TDF_SINTR to sleepq_add() if this flag is set rather than sleepq_catch_signals(). Note that it is the caller's responsibility to ensure that sleepq_catch_signals() is called if and only if this flag is passed to the preceeding sleepq_add(). Note that this also removes a sched_lock lock/unlock pair from sleepq_catch_signals(). It also ensures that for an interruptible sleep, TDF_SINTR is always set when TD_ON_SLEEPQ() is true.
110 lines
5 KiB
C
110 lines
5 KiB
C
/*
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* Copyright (c) 2004 John Baldwin <jhb@FreeBSD.org>
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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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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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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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* $FreeBSD$
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*/
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#ifndef _SYS_SLEEPQUEUE_H_
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#define _SYS_SLEEPQUEUE_H_
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/*
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* Sleep queue interface. Sleep/wakeup and condition variables use a sleep
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* queue for the queue of threads blocked on a sleep channel.
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*
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* A thread calls sleepq_lookup() to look up the proper sleep queue in the
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* hash table that is associated with a specified wait channel. This
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* function returns a pointer to the queue and locks the associated sleep
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* queue chain. A thread calls sleepq_add() to add themself onto a sleep
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* queue and calls one of the sleepq_wait() functions to actually go to
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* sleep. If a thread needs to abort a sleep operation it should call
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* sleepq_release() to unlock the associated sleep queue chain lock. If
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* the thread also needs to remove itself from a queue it just enqueued
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* itself on, it can use sleepq_remove().
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*
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* If the thread only wishes to sleep for a limited amount of time, it can
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* call sleepq_set_timeout() after sleepq_add() to setup a timeout. It
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* should then use one of the sleepq_timedwait() functions to block.
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*
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* If the thread wants to the sleep to be interruptible by signals, it can
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* call sleepq_catch_signals() after sleepq_add(). It should then use
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* one of the sleepq_wait_sig() functions to block. After the thread has
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* been resumed, it should call sleepq_calc_signal_retval() to determine
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* if it should return EINTR or ERESTART passing in the value returned from
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* the earlier call to sleepq_catch_signals().
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*
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* A thread is normally resumed from a sleep queue by either the
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* sleepq_signal() or sleepq_broadcast() functions. Sleepq_signal() wakes
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* the thread with the highest priority that is sleeping on the specified
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* wait channel. Sleepq_broadcast() wakes all threads that are sleeping
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* on the specified wait channel. A thread sleeping in an interruptible
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* sleep can be interrupted by calling sleepq_abort(). A thread can also
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* be removed from a specified sleep queue using the sleepq_remove()
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* function.
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*
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* Each thread allocates a sleep queue at thread creation via sleepq_alloc()
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* and releases it at thread destruction via sleepq_free(). Note that
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* a sleep queue is not tied to a specific thread and that the sleep queue
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* released at thread destruction may not be the same sleep queue that the
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* thread allocated when it was created.
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*
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* XXX: Some other parts of the kernel such as ithread sleeping may end up
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* using this interface as well (death to TDI_IWAIT!)
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*/
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struct mtx;
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struct sleepqueue;
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struct thread;
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#ifdef _KERNEL
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#define SLEEPQ_TYPE 0x0ff /* Mask of sleep queue types. */
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#define SLEEPQ_MSLEEP 0x00 /* Used by msleep/wakeup. */
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#define SLEEPQ_CONDVAR 0x01 /* Used for a cv. */
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#define SLEEPQ_INTERRUPTIBLE 0x100 /* Sleep is interruptible. */
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void init_sleepqueues(void);
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void sleepq_abort(struct thread *td);
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void sleepq_add(struct sleepqueue *, void *, struct mtx *, const char *,
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int);
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struct sleepqueue *sleepq_alloc(void);
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void sleepq_broadcast(void *, int, int);
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int sleepq_calc_signal_retval(int sig);
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int sleepq_catch_signals(void *wchan);
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void sleepq_free(struct sleepqueue *);
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struct sleepqueue *sleepq_lookup(void *);
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void sleepq_release(void *);
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void sleepq_remove(struct thread *, void *);
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void sleepq_signal(void *, int, int);
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void sleepq_set_timeout(void *wchan, int timo);
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int sleepq_timedwait(void *wchan);
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int sleepq_timedwait_sig(void *wchan, int signal_caught);
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void sleepq_wait(void *);
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int sleepq_wait_sig(void *wchan);
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#endif /* _KERNEL */
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#endif /* !_SYS_SLEEPQUEUE_H_ */
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