/usr/include/x86_64-linux-gnu/qcc/windows/Event.h is in liballjoyn-common-dev-1604 16.04a-3.
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* @file
*
* Platform independent event implementation
*/
/******************************************************************************
* Copyright AllSeen Alliance. All rights reserved.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
******************************************************************************/
#ifndef _OS_QCC_EVENT_H
#define _OS_QCC_EVENT_H
#include <qcc/platform.h>
#include <winsock2.h>
#include <windows.h>
#include <vector>
#include <qcc/atomic.h>
#include <qcc/Mutex.h>
#include <Status.h>
/** @internal */
namespace qcc {
/** @internal Forward Reference */
class Source;
/**
* Events are used to send signals between threads.
*/
class Event {
public:
/** Cause Wait to have no timeout */
static const uint32_t WAIT_FOREVER = static_cast<uint32_t>(-1);
/** Singleton always set Event */
static Event& alwaysSet;
/** Singleton never set Event */
static Event& neverSet;
/** Indicate how to select on file descriptor */
typedef enum {
GEN_PURPOSE, /**< General purpose Windows event backed event */
IO_READ, /**< IO read event */
IO_WRITE, /**< IO write event */
TIMED /**< Event is automatically set based on time */
} EventType;
/**
* Create a general purpose Event.
* General purpose events are manually set and and reset.
*/
Event();
/**
* Create a general purpose Event optionally as
* a network interface event.
* Network interface events are manually reset.
*/
Event(bool networkIfaceEvent);
/**
* Create a timed event.
* Timed events cannot be manually set and reset.
*
* @param delay Number of milliseconds to delay before Event is automatically set.
* @param period Number of milliseconds between auto-set events or 0 to indicate no repeat.
*/
Event(uint32_t delay, uint32_t period = 0);
/**
* Create an event from an existing event.
* This constructor is typically used to create an IO_WRITE type event from an IO_READ one.
* (or vice-versa). Some platforms (windows) do not allow creation of two independent events
* from the same socket descriptor. Thus, this constructor is used for creating the second
* Event (sink or source) rather than using the one that takes a file descriptor as an argument twice.
*
* @param event Event whose underlying source is used a basis for a new event.
* @param genPurpose true if event should act as both an I/O event and a gen purpose event.
*/
Event(Event& event, EventType eventType, bool genPurpose);
/**
* Constructor used by I/O sources/sinks
*
* @param fd Socket descriptor associated with this event.
* @param eventType Type of event (IO_READ or IO_WRITE) associated with fd.
*/
Event(SocketFd fd, EventType eventType);
/**
* Constructor used by Windows specific named pipe I/O sources/sinks.
* (This constructor should only be used within Windows platform specific code.)
*
* @param pipeHandle pipe handle associated with this event.
* @param eventType Type of event (IO_READ or IO_WRITE) associated with pipe.
*/
Event(HANDLE pipeHandle, EventType eventType);
/** Destructor */
~Event();
/**
* Wait on a group of events.
* The call to Wait will return when any of the events on the list is signaled.
*
* @warning There is a subtle difference between Windows and Posix
* implementations of this method. In the Windows case, the return value of
* this method inherits ER_TIMEOUT from any checkEvents that time out; but
* in the posix case ER_OK is returned if one of the checkEvents times out.
* For portable uses of this method consider ER_OK and ER_TIMEOUT as
* indicating success.
*
* @param checkEvents Vector of event object references to wait on.
* @param signaledEvents Vector of event object references from checkEvents that are signaled.
* @param maxMs Max number of milliseconds to wait or WAIT_FOREVER to wait forever.
* @return ER_OK if successful, ER_TIMEOUT if one if the checkEvents times out.
*/
static QStatus AJ_CALL Wait(const std::vector<Event*>& checkEvents, std::vector<Event*>& signaledEvents, uint32_t maxMs = WAIT_FOREVER);
/**
* Wait on a single event.
* The call to Wait will return when the event is signaled.
*
* @param event Event to wait on.
* @param maxMs Max number of milliseconds to wait or WAIT_FOREVER to wait forever.
* @param includeStopEvent Return if either the event or the caller's stop event is set.
* @return
* - #ER_OK if successful.
* - #ER_STOPPING_THREAD if includeStopEvent and the caller's thread is stopping (@see
* qcc::Thread::IsStopping()).
* - #ER_ALERTED_THREAD if the caller's thread is not stopping and the the caller's stopEvent
* is set (@see qcc::Thread::Alert()).
* - #ER_TIMEOUT if the event is not set.
* - #ER_OS_ERROR if the wait failed.
*/
static QStatus AJ_CALL Wait(Event& event, uint32_t maxMs = WAIT_FOREVER, bool includeStopEvent = true);
/**
* Release a lock and then wait on a single event.
* The call to Wait will return when the event is signaled.
*
* @param event Event to wait on.
* @param lock The lock to release after incrementing numThreads
* @param maxMs Max number of milliseconds to wait or WAIT_FOREVER to wait forever.
* @param includeStopEvent Return if either the event or the caller's stop event is set.
* @return
* - #ER_OK if successful.
* - #ER_STOPPING_THREAD if includeStopEvent and the caller's thread is stopping (@see
* qcc::Thread::IsStopping()).
* - #ER_ALERTED_THREAD if the caller's thread is not stopping and the the caller's stopEvent
* is set (@see qcc::Thread::Alert()).
* - #ER_TIMEOUT if the event is not set.
* - #ER_OS_ERROR if the wait failed.
*/
static QStatus AJ_CALL Wait(Event& event, qcc::Mutex& lock, uint32_t maxMs = WAIT_FOREVER, bool includeStopEvent = true)
{
event.IncrementNumThreads();
lock.Unlock();
QStatus status = Wait(event, maxMs, includeStopEvent);
event.DecrementNumThreads();
return status;
}
/**
* Set the event to the signaled state.
* All threads that are waiting on the event will become runnable.
* Calling SetEvent when the state is already signaled has no effect.
*
* @return ER_OK if successful.
*/
QStatus SetEvent();
/**
* Indicate whether the event is associated with a socket.
*
* @return true if the event is for sockets, otherwise false.
*/
bool IsSocket() const { return isSocket; }
/**
* Reset the event to the non-signaled state.
* Threads that call wait() will block until the event state becomes signaled.
* Calling ResetEvent() when the state of the event is non-signaled has no effect.
*
* @return ER_OK if successful.
*/
QStatus ResetEvent();
/**
* Indicate whether the event is currently set.
*
* @return true iff event is set.
*/
bool IsSet();
/**
* Reset TIMED event and set next auto-set delay and period.
*
* @param delay Number of milliseconds to delay before Event is automatically set.
* @param period Number of milliseconds between auto-set events or 0 to indicate no repeat.
*/
void ResetTime(uint32_t delay, uint32_t period);
/**
* Get the underlying file descriptor for I/O backed events.
* This returns INVALID_SOCKET_FD if there is no underlying file descriptor.
*
* @return The underlying file descriptor or INVALID_SOCKET_FD.
*/
SocketFd GetFD() const { return ioFd; }
/**
* Get the underlying Windows' event or waitable timer handle. Use of this function is not
* portable and should only be used in platform specific code.
*
* @return The underlying event or waitable timer handle.
*/
HANDLE GetHandle() const
{
switch (eventType) {
case GEN_PURPOSE: return handle;
case TIMED: return timerHandle;
default: return ioHandle;
}
}
/**
* Return the type of this event.
*/
EventType GetEventType() const { return eventType; }
/**
* Get the number of threads that are currently blocked waiting for this event
*
* @return The number of blocked threads
*/
uint32_t GetNumBlockedThreads() { return numThreads; }
private:
static void Init();
static void Shutdown();
friend class StaticGlobals;
HANDLE handle; /**< General purpose event handle */
HANDLE ioHandle; /**< I/O event handle */
EventType eventType; /**< Type of event */
uint32_t period; /**< Number of milliseconds between periodic timed events */
HANDLE timerHandle; /**< Waitable timer used to implement a TIMED event */
SocketFd ioFd; /**< Socket descriptor or INVALID_SOCKET_FD if not socket based IO */
volatile int32_t numThreads; /**< Number of threads currently waiting on this event */
bool networkIfaceEvent;
HANDLE networkIfaceHandle;
bool isSocket; /**< Is this event for socket or named pipe */
/**
* Private copy constructor.
* Events cannot be safely copied because they contain events handles.
*/
Event& operator=(const Event&);
/**
* Helper method used to calculate mask for WSAEventSelect
* @param evt Event being waited on.
*/
static void SetIOMask(Event& evt);
/**
* Helper method used to release mask for WSAEventSelect.
* @param evt Event previously referenced in SetIOMask().
*/
static void ReleaseIOMask(Event& evt);
/**
* Increment the count of threads blocked on this event
*/
void IncrementNumThreads() { IncrementAndFetch(&numThreads); }
/**
* Decrement the count of threads blocked on this event
*/
void DecrementNumThreads() { DecrementAndFetch(&numThreads); }
/**
* Event polling method used to check whether the event has been set.
*/
bool IsNetworkEventSet();
};
} /* namespace */
#endif
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