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Makefile
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Makefile.common
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Makefile.depend
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callout.cc
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callout.h
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case_file.cc
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case_file.h
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tests
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vdev.cc
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vdev.h
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vdev_iterator.cc
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vdev_iterator.h
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zfsd.8
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zfsd.cc
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zfsd.h
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zfsd_event.cc
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zfsd_event.h
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zfsd_exception.cc
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zfsd_exception.h
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zfsd_main.cc
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zpool_list.cc
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zpool_list.h
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Editing: callout.h
/*- * Copyright (c) 2011, 2012, 2013 Spectra Logic Corporation * 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, * without modification. * 2. Redistributions in binary form must reproduce at minimum a disclaimer * substantially similar to the "NO WARRANTY" disclaimer below * ("Disclaimer") and any redistribution must be conditioned upon * including a substantially similar Disclaimer requirement for further * binary redistribution. * * NO WARRANTY * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES. * * Authors: Justin T. Gibbs (Spectra Logic Corporation) * * $FreeBSD$ */ /** * \file callout.h * * \brief Interface for timer based callback services. * * Header requirements: * * #include <sys/time.h> * * #include <list> */ #ifndef _CALLOUT_H_ #define _CALLOUT_H_ /** * \brief Type of the function callback from a Callout. */ typedef void CalloutFunc_t(void *); /** * \brief Interface to a schedulable one-shot timer with the granularity * of the system clock (see setitimer(2)). * * Determination of callback expiration is triggered by the SIGALRM * signal. Callout callbacks are always delivered from Zfsd's event * processing loop. * * Periodic actions can be triggered via the Callout mechanisms by * resetting the Callout from within its callback. */ class Callout { public: /** * Initialize the Callout subsystem. */ static void Init(); /** * Function called (via SIGALRM) when our interval * timer expires. */ static void AlarmSignalHandler(int); /** * Execute callbacks for all callouts that have the same * expiration time as the first callout in the list. */ static void ExpireCallouts(); /** Constructor. */ Callout(); /** * Returns true if callout has not been stopped, * or deactivated since the last time the callout was * reset. */ bool IsActive() const; /** * Returns true if callout is still waiting to expire. */ bool IsPending() const; /** * Disestablish a callout. */ bool Stop(); /** * \brief Establish or change a timeout. * * \param interval Timeval indicating the time which must elapse * before this callout fires. * \param func Pointer to the callback function * \param arg Argument pointer to pass to callback function * * \return Cancellation status. * true: The previous callback was pending and therefore * was cancelled. * false: The callout was not pending at the time of this * reset request. * In all cases, a new callout is established. */ bool Reset(const timeval &interval, CalloutFunc_t *func, void *arg); /** * \brief Calculate the remaining time until this Callout's timer * expires. * * The return value will be slightly greater than the actual time to * expiry. * * If the callout is not pending, returns INT_MAX. */ timeval TimeRemaining() const; private: /** * All active callouts sorted by expiration time. The callout * with the nearest expiration time is at the head of the list. */ static std::list<Callout *> s_activeCallouts; /** * The interval timer has expired. This variable is set from * signal handler context and tested from Zfsd::EventLoop() * context via ExpireCallouts(). */ static bool s_alarmFired; /** * Time, relative to others in the active list, until * this callout is fired. */ timeval m_interval; /** Callback function argument. */ void *m_arg; /** * The callback function associated with this timer * entry. */ CalloutFunc_t *m_func; /** State of this callout. */ bool m_pending; }; //- Callout public const methods ---------------------------------------------- inline bool Callout::IsPending() const { return (m_pending); } //- Callout public methods ---------------------------------------------------- inline Callout::Callout() : m_arg(0), m_func(NULL), m_pending(false) { timerclear(&m_interval); } #endif /* CALLOUT_H_ */
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