PISharedMemory Class Reference

Shared memory. More...

Inheritance diagram for PISharedMemory:

Public Member Functions
	PISharedMemory (const PIString &shm_name, int size, DeviceMode mode=ReadWrite)
	Constructs a shared memory object with name "shm_name", size "size" and open mode "mode".
PIByteArray	readAll ()
	Read all shared memory object content to byte array and return it.
llong	size () const
	Returns shared memory object size.
void	setSize (llong s)
	Set shared memory object size.
bool	isEmpty () const
	Returns if shared memory object is empty.
int	read (void *read_to, int max_size)
	Read from shared memory object to "read_to" no more than "max_size" and return readed bytes count.
int	read (void *read_to, int max_size, int offset)
	Read from shared memory object to "read_to" no more than "max_size" and return readed bytes count.
int	write (const void *data, int max_size)
	Write to shared memory object "data" with size "max_size" and return written bytes count.
int	write (const void *data, int max_size, int offset)
	Write to shared memory object "data" with size "max_size" and return written bytes count.
int	write (const PIByteArray &data)
	Write "data" to shared memory object.
int	write (const PIByteArray &data, int offset)
	Write "data" to shared memory object.
Public Member Functions inherited from PIIODevice
	PIIODevice ()
	Constructs a empty PIIODevice.
	PIIODevice (const PIString &path, DeviceMode mode=ReadWrite)
	Constructs a PIIODevice with path and mode. More...
DeviceMode	mode () const
	Current open mode of device.
void	setMode (DeviceMode m)
	Set open mode of device.
DeviceOptions	options () const
	Current device options.
bool	isOptionSet (DeviceOption o) const
	Current device option "o" state.
void	setOptions (DeviceOptions o)
	Set device options.
bool	setOption (DeviceOption o, bool yes=true)
	Set device option "o" to "yes" and return previous state.
DeviceInfoFlags	infoFlags () const
	Returns device characteristic flags.
PIString	path () const
	Current path of device.
void	setPath (const PIString &path)
	Set path of device.
bool	isReadable () const
	Return true if mode is ReadOnly or ReadWrite.
bool	isWriteable () const
	Return true if mode is WriteOnly or ReadWrite.
bool	isOpened () const
	Return true if device is successfully opened.
bool	isClosed () const
	Return true if device is closed.
virtual bool	canRead () const
	Return true if device can read now.
virtual bool	canWrite () const
	Return true if device can write now.
void	setReopenEnabled (bool yes=true)
	Set execution of open enabled while threaded read on closed device.
void	setReopenTimeout (int msecs)
	Set timeout in milliseconds between open tryings if reopen is enabled.
bool	isReopenEnabled () const
	Return reopen enable.
int	reopenTimeout ()
	Return reopen timeout.
void	setThreadedReadSlot (ReadRetFunc func)
	Set "threaded read slot". More...
void	setThreadedReadData (void *d)
	Set custom data that will be passed to "threaded read slot".
void	setThreadedReadBufferSize (int new_size)
	Set size of threaded read buffer. More...
int	threadedReadBufferSize () const
	Return size of threaded read buffer.
const uchar *	threadedReadBuffer () const
	Return content of threaded read buffer.
void *	threadedReadData () const
	Return custom data that will be passed to "threaded read slot".
bool	isThreadedRead () const
	Return true if threaded read is started.
void	startThreadedRead ()
	Start threaded read.
void	startThreadedRead (ReadRetFunc func)
	Start threaded read and assign "threaded read slot" to "func".
void	stopThreadedRead ()
	Stop threaded read.
bool	isThreadedWrite () const
	Return true if threaded write is started.
void	startThreadedWrite ()
	Start threaded write.
void	stopThreadedWrite ()
	Stop threaded write.
void	clearThreadedWriteQueue ()
	Clear threaded write task queue.
void	start ()
	Start both threaded read and threaded write.
void	stop (bool wait=false)
	Stop both threaded read and threaded write and if "wait" block until both threads are stop.
int	read (void *read_to, int max_size)
	Read from device maximum "max_size" bytes to "read_to".
PIByteArray	read (int max_size)
	Read from device maximum "max_size" bytes and return them as PIByteArray.
int	write (const void *data, int max_size)
	Write maximum "max_size" bytes of "data" to device.
PIByteArray	readForTime (double timeout_ms)
	Read from device for "timeout_ms" milliseconds and return readed data as PIByteArray. Timeout should to be greater than 0.
ullong	writeThreaded (const void *data, int max_size)
	Add task to threaded write queue and return task ID.
ullong	writeThreaded (const PIByteArray &data)
	Add task to threaded write queue and return task ID.
bool	configure (const PIString &config_file, const PIString &section, bool parent_section=false)
	Configure device from section "section" of file "config_file", if "parent_section" parent section also will be read.
PIString	constructFullPath () const
	Reimplement to construct full unambiguous string, describes this device, default returns fullPathPrefix() + "://" + path()
void	configureFromFullPath (const PIString &full_path)
	Reimplement to configure your device with parameters of full unambiguous string. Default implementation does nothing.
bool	open ()
	Open device.
bool	open (const PIString &_path)
	Open device with path "path".
bool	close ()
	Close device.
int	write (PIByteArray data)
	Write "data" to device.
virtual void	flush ()
	Immediate write all buffers.
void	opened ()
	Raise if succesfull open.
void	closed ()
	Raise if succesfull close.
void	threadedReadEvent (uchar *readed, int size)
	Raise if read thread succesfull read some data.
void	threadedWriteEvent (ullong id, int written_size)
	Raise if write thread successfull write some data of task with ID "id".
Public Member Functions inherited from PIThread
	PIThread (void *data, ThreadFunc func, bool startNow=false, int loop_delay=-1)
	Contructs thread with custom data "data", external function "func" and main loop delay "loop_delay".
	PIThread (bool startNow=false, int loop_delay=-1)
	Contructs thread with main loop delay "loop_delay".
void	setData (void *d)
	Set common data passed to external function.
void	setSlot (ThreadFunc func)
	Set external function that will be executed after every run()
void	setPriority (PIThread::Priority prior)
	Set priority of thread.
void *	data () const
	Returns common data passed to external function.
PIThread::Priority	priority () const
	Return priority of thread.
bool	isRunning () const
	Return true if thread is running.
void	needLockRun (bool need)
	Set necessity of lock every run with internal mutex.
PIMutex &	mutex ()
	Returns internal mutex.
llong	tid () const
	Returns thread ID.
bool	start (int timer_delay)
	Start thread. More...
bool	startOnce ()
	Start thread without internal loop. More...
bool	startOnce (ThreadFunc func)
	Start thread without internal loop. More...
void	stop (bool wait)
	Stop thread. More...
void	terminate ()
	Strongly stop thread. More...
bool	waitForStart (int timeout_msecs)
	Wait for thread start. More...
bool	waitForFinish (int timeout_msecs)
	Wait for thread finish. More...
void	lock ()
	Lock internal mutex.
void	unlock ()
	Unlock internal mutex.
void	started ()
	Raise on thread start.
void	stopped ()
	Raise on thread stop.
Public Member Functions inherited from PIObject
	PIObject (const PIString &name=PIString())
	Contructs PIObject with name "name".
PIString	name () const
	Returns object name.
virtual const char *	className () const
	Returns object class name.
virtual const char *	parentClassName () const
	Returns parent object class name.
bool	debug () const
	Return if debug of this object is active.
void	setName (const PIString &name)
	Set object name.
void	setDebug (bool debug)
	Set object debug active.
const PIMap< PIString, PIVariant > &	properties () const
	Returns properties of the object.
int	propertiesCount () const
	Returns properties count of the object.
PIVariant	property (const PIString &name) const
	Returns property with name "name".
void	setProperty (const PIString &name, const PIVariant &value)
	Set property with name "name" to "value". If there is no such property in object it will be added.
bool	isPropertyExists (const PIString &name) const
	Returns if property with name "name" exists.

Protected Member Functions
bool	openDevice ()
	Reimplement to open device, return value will be set to "opened_" variable; don't call this function in subclass, use open()
bool	closeDevice ()
	Reimplement to close device, inverse return value will be set to "opened_" variable.
PIString	fullPathPrefix () const
	Reimplement to construct full unambiguous string prefix. Creating devices by unambiguous string.
PIString	constructFullPathDevice () const
	Reimplement to construct full unambiguous string, describes this device. Default implementation returns path()
void	configureFromFullPathDevice (const PIString &full_path)
	Reimplement to configure your device with parameters of full unambiguous string. Default implementation does nothing.
int	readDevice (void *read_to, int max_size)
	Reimplement this function to read from your device.
int	writeDevice (const void *data, int max_size)
	Reimplement this function to write to your device.
DeviceInfoFlags	deviceInfoFlags () const
	Reimplement to return correct DeviceInfoFlags. Default implementation returns 0.
Protected Member Functions inherited from PIIODevice
virtual bool	init ()
	Function executed before first openDevice() or from constructor.
virtual bool	configureDevice (const void *e_main, const void *e_parent=0)
	Reimplement to configure device from entries "e_main" and "e_parent", cast arguments to PIConfig::Entry*.
virtual bool	threadedRead (uchar *readed, int size)
	Function executed when thread read some data, default implementation execute external slot "ret_func_".
virtual void	optionsChanged ()
	Reimplement to apply new device options.
virtual void	threadedReadBufferSizeChanged ()
	Reimplement to apply new threadedReadBufferSize()
Protected Member Functions inherited from PIObject
PIObject *	emitter () const
	Returns PIObject* which has raised an event. This value is correct only in definition of some event handler.
virtual void	propertyChanged (const PIString &name)
	Virtual function executes after property with name "name" has been changed.
void	deleted ()
	Raise before object delete. More...

Additional Inherited Members
Public Types inherited from PIIODevice
enum	DeviceMode { ReadOnly = 0x01, WriteOnly = 0x02, ReadWrite = 0x03 }
	Open modes for PIIODevice. More...
enum	DeviceOption { BlockingRead = 0x01, BlockingWrite = 0x02 }
	Options for PIIODevice, works with some devices. More...
enum	DeviceInfoFlag { Sequential = 0x01, Reliable = 0x02 }
	Characteristics of PIIODevice subclass. More...
Public Types inherited from PIThread
enum	Priority {   piLowerst, piLow, piNormal, piHigh,   piHighest }
	Priority of thread. More...
Static Public Member Functions inherited from PIIODevice
static PIIODevice *	createFromFullPath (const PIString &full_path)
	Try to determine suitable device, create new one, configure it with configureFromFullPath() and returns it. More...
Static Public Member Functions inherited from PIObject
static void	piDisconnect (PIObject *src, const PIString &sig)
	Disconnect object "src" from all connections with event name "sig".
static void	piDisconnect (PIObject *src)
	Disconnect object "src" from all connections, i.e. all connections where object "src" is emitter.
static PIObject *	findByName (const PIString &name)
	Returns PIObject* with name "name" or 0, if there is no object found.
Public Attributes inherited from PIIODevice
bool	reopenEnabled
	setReopenEnabled, default "true"
int	reopenTimeout
	setReopenTimeout in ms, default 1000
int	threadedReadBufferSize
	setThreadedReadBufferSize in bytes, default 4096
Related Functions inherited from PIIODevice
template<typename T >
T	readDeviceSetting (const PIString &name, const T &def, const PIConfig::Entry *em, const PIConfig::Entry *ep)
	Service function. useful for configuring devices. More...
#define	REGISTER_DEVICE(class)
	Use this macro to enable automatic creation instances of your class with createFromFullPath() function.
#define	PIIODEVICE(class)
	Use this macro instead of PIOBJECT when describe your own PIIODevice.
Related Functions inherited from PIObject
#define	piCoutObj
	Macro used for conditional (piDebug and PIObject::debug()) output to PICout for subclasses of PIObject.
#define	PIOBJECT(name)
	you should use this macro after class declaration to use EVENT and EVENT_HANDLER and correct piCoutObj output
#define	PIOBJECT_SUBCLASS(name, parent)
	you should use this macro after class declaration to use EVENT and EVENT_HANDLER of parent class, and scopeList()
#define	EVENT_HANDLER0(ret, name)   ret name()
	declare event handler "event" with name "name" and return type "ret", ret name()
#define	EVENT_HANDLER1(ret, name, type0, var0)   ret name(type0 var0)
	declare event handler "event" with name "name" and return type "ret", ret name(type0 var0)
#define	EVENT_HANDLER2(ret, name, type0, var0, type1, var1)   ret name(type0 var0, type1 var1)
	declare event handler "event" with name "name" and return type "ret", ret name(type0 var0, type1 var1)
#define	EVENT_HANDLER3(ret, name, type0, var0, type1, var1, type2, var2)   ret name(type0 var0, type1 var1, type2 var2)
	declare event handler "event" with name "name" and return type "ret", ret name(type0 var0, type1 var1, type2 var2)
#define	EVENT_HANDLER4(ret, name, type0, var0, type1, var1, type2, var2, type3, var3)   ret name(type0 var0, type1 var1, type2 var2, type3 var3)
	declare event handler "event" with name "name" and return type "ret", ret name(type0 var0, type1 var1, type2 var2, type3 var3)
#define	EVENT_HANDLER   EVENT_HANDLER0
	EVENT_HANDLER is synonym of EVENT_HANDLER0.
#define	EVENT_VHANDLER0(ret, name)   virtual ret name()
	declare virtual event handler "event" with name "name" and return type "ret", virtual ret name()
#define	EVENT_VHANDLER1(ret, name, type0, var0)   virtual ret name(type0 var0)
	declare virtual event handler "event" with name "name" and return type "ret", virtual ret name(type0 var0)
#define	EVENT_VHANDLER2(ret, name, type0, var0, type1, var1)   virtual ret name(type0 var0, type1 var1)
	declare virtual event handler "event" with name "name" and return type "ret", virtual ret name(type0 var0, type1 var1)
#define	EVENT_VHANDLER3(ret, name, type0, var0, type1, var1, type2, var2)   virtual ret name(type0 var0, type1 var1, type2 var2)
	declare virtual event handler "event" with name "name" and return type "ret", virtual ret name(type0 var0, type1 var1, type2 var2)
#define	EVENT_VHANDLER4(ret, name, type0, var0, type1, var1, type2, var2, type3, var3)   virtual ret name(type0 var0, type1 var1, type2 var2, type3 var3)
	declare virtual event handler "event" with name "name" and return type "ret", virtual ret name(type0 var0, type1 var1, type2 var2, type3 var3)
#define	EVENT_VHANDLER   EVENT_VHANDLER0
	EVENT_VHANDLER is synonym of EVENT_VHANDLER0.
#define	EVENT0(name)   void name();
	declare event "event" with name "name", void name();
#define	EVENT1(name, type0, var0)   void name(type0 var0);
	declare event "event" with name "name", void name(type0 var0);
#define	EVENT2(name, type0, var0, type1, var1)   void name(type0 var0, type1 var1);
	declare event "event" with name "name", void name(type0 var0, type1 var1);
#define	EVENT3(name, type0, var0, type1, var1, type2, var2)   void name(type0 var0, type1 var1, type2 var2);
	declare event "event" with name "name", void name(type0 var0, type1 var1, type2 var2);
#define	EVENT4(name, type0, var0, type1, var1, type2, var2, type3, var3)   void name(type0 var0, type1 var1, type2 var2, type3 var3);
	declare event "event" with name "name", void name(type0 var0, type1 var1, type2 var2, type3 var3);
#define	EVENT   EVENT0
	EVENT is synonym of EVENT0.
#define	CONNECTU(src, event, dest, handler)
	connect event "event" from object "src" to event handler "handler". "Event" and "handler" must has equal argument lists.
#define	CONNECTU_QUEUED(src, event, dest, handler, performer)
	connect event "event" from object "src" to event handler "handler". Event handler will be executed by "performer". "Event" and "handler" must has equal argument lists.
#define	CONNECT0(ret, src, event, dest, handler)
	connect event "event" from object "src" to event handler "handler" with return type "ret" from object "dest" with check of event and handler exists
#define	CONNECT1(ret, type0, src, event, dest, handler)
	connect event "event" from object "src" to event handler "handler" with return type "ret" from object "dest" with check of event and handler exists
#define	CONNECT2(ret, type0, type1, src, event, dest, handler)
	connect event "event" from object "src" to event handler "handler" with return type "ret" from object "dest" with check of event and handler exists
#define	CONNECT3(ret, type0, type1, type2, src, event, dest, handler)
	connect event "event" from object "src" to event handler "handler" with return type "ret" from object "dest" with check of event and handler exists
#define	CONNECT4(ret, type0, type1, type2, type3, src, event, dest, handler)
	connect event "event" from object "src" to event handler "handler" with return type "ret" from object "dest" with check of event and handler exists
#define	CONNECT   CONNECT0
	CONNECT is synonym of CONNECT0.
#define	WEAK_CONNECT0(ret, src, event, dest, handler)
	connect event "event" from object "src" to event handler "handler" with return type "ret" from object "dest" without check of event exists
#define	WEAK_CONNECT1(ret, type0, src, event, dest, handler)
	connect event "event" from object "src" to event handler "handler" with return type "ret" from object "dest" without check of event exists
#define	WEAK_CONNECT2(ret, type0, type1, src, event, dest, handler)
	connect event "event" from object "src" to event handler "handler" with return type "ret" from object "dest" without check of event exists
#define	WEAK_CONNECT3(ret, type0, type1, type2, src, event, dest, handler)
	connect event "event" from object "src" to event handler "handler" with return type "ret" from object "dest" without check of event exists
#define	WEAK_CONNECT4(ret, type0, type1, type2, type3, src, event, dest, handler)
	connect event "event" from object "src" to event handler "handler" with return type "ret" from object "dest" without check of event exists
#define	WEAK_CONNECT   WEAK_CONNECT0
	WEAK_CONNECT is synonym of WEAK_CONNECT0.
#define	DISCONNECT0(ret, src, event, dest, handler)
	piDisconnect event "event" from object "src" from event handler "handler" with return type "ret" from object "dest"
#define	DISCONNECT1(ret, type0, src, event, dest, handler)
	piDisconnect event "event" from object "src" from event handler "handler" with return type "ret" from object "dest"
#define	DISCONNECT2(ret, type0, type1, src, event, dest, handler)
	piDisconnect event "event" from object "src" from event handler "handler" with return type "ret" from object "dest"
#define	DISCONNECT3(ret, type0, type1, type2, src, event, dest, handler)
	piDisconnect event "event" from object "src" from event handler "handler" with return type "ret" from object "dest"
#define	DISCONNECT4(ret, type0, type1, type2, type3, src, event, dest, handler)
	piDisconnect event "event" from object "src" from event handler "handler" with return type "ret" from object "dest"
#define	DISCONNECT   DISCONNECT0
	DISCONNECT is synonym of DISCONNECT0.
#define	HANDLER(handler)
	Returns pointer to events handler "handler".

Detailed Description

Shared memory.

Synopsis

This class provide access to local file. You can manipulate binary content or use this class as text stream. To binary access there are function read(), write(), and many writeBinary() functions. For write variables to file in their text representation threr are many "<<" operators.

Position

Each opened file has a read/write position - logical position in the file content you read from or you write to. You can find out current position with function pos(). Function seek(llong position) move position to position "position", seekToBegin() move position to the begin of file, seekToEnd() move position to the end of file.