Contains the values of options used to determine the synchronous and asynchronous behavior. More...

#include <Synch_Options.h>

Collaboration diagram for ACE_Synch_Options:

Public Types
enum	{ USE_REACTOR = 01, USE_TIMEOUT = 02 }
	Options flags for controlling synchronization. More...
Public Member Functions
	ACE_Synch_Options (unsigned long options=0, const ACE_Time_Value &timeout=ACE_Time_Value::zero, const void *arg=0)
void	set (unsigned long options=0, const ACE_Time_Value &timeout=ACE_Time_Value::zero, const void *arg=0)
bool	operator[] (unsigned long option) const
	Returns true if the specified option(s) are enabled, false otherwise.
void	operator= (unsigned long option)
	Adds the specified option(s) to the object; does not replace them.
const void *	arg (void) const
	Returns the "magic cookie" argument.
void	arg (const void *)
	Set the "magic cookie" argument.
const ACE_Time_Value &	timeout (void) const
void	timeout (const ACE_Time_Value &tv)
const ACE_Time_Value *	time_value (void) const
void	dump (void) const
	Dump the state of an object.
Public Attributes
	ACE_ALLOC_HOOK_DECLARE
	Declare the dynamic allocation hooks.
Static Public Attributes
static ACE_Synch_Options	defaults
static ACE_Synch_Options	synch
	This is the default synchronous setting.
static ACE_Synch_Options	asynch
	This is the default asynchronous setting.
Private Attributes
unsigned long	options_
	Keeps track of the enabled options.
ACE_Time_Value	timeout_
	Amount of time to wait for timeouts.
const void *	arg_

Detailed Description

Contains the values of options used to determine the synchronous and asynchronous behavior.

The supported set of options is depicted in the following table. The Reactor column indicates whether or not the USE_REACTOR option is supplied. The Timeout column specifies the period of time specified by the object; Unused implies that USE_TIMEOUT is not included in the options and the default timeout value, ACE_Time_Value::zero, is specified, either explicitly or by default.

Reactor	Timeout	Behavior
yes	Unused	Infinite timeout (using Reactor); this is the default.
yes	time	Try asynch transaction for the specified time (using Reactor)
yes	0,0	Poll; try, if EWOULDBLOCK, return immediately (using Reactor)
no	Unused	Block until completion (don't use Reactor)
no	time	Wait up to specified amount of time for completion (don't use Reactor)
no	0,0	Poll and return immediately

Member Enumeration Documentation

anonymous enum

Options flags for controlling synchronization.

Note that these flags can be bit-wise "or'd" together if both options are desired.

Enumerator:

USE_REACTOR	Use the Reactor.
USE_TIMEOUT	Use the supplied timeout value.

Constructor & Destructor Documentation

ACE_Synch_Options::ACE_Synch_Options	(	unsigned long	options = `0`,
		const ACE_Time_Value &	timeout = `ACE_Time_Value::zero`,
		const void *	arg = `0`
	)

Initialize the object to default values unless specified otherwise.

Parameters:

options	Specifies the options to use; default is neither option (no reactor, no timeout).
timeout	Specifies the period of time to use for the operation's timeout. The default is ACE_Time_Value::zero, noted as 0,0 in the behavior options table. If a non-zero timeout is specified, the USE_TIMEOUT option is added to options. To use a zero timeout, USE_TIMEOUT must be explicitly specified in options.
arg	A completion tag that can be passed through the options; the class using ACE_Synch_Options can access this. ACE_Synch_Options makes no use of it internally.

Member Function Documentation

const void * ACE_Synch_Options::arg ( void ) const

Returns the "magic cookie" argument.

void ACE_Synch_Options::arg ( const void * a )

Set the "magic cookie" argument.

void ACE_Synch_Options::dump ( void ) const

Dump the state of an object.

void ACE_Synch_Options::operator= ( unsigned long option )

Adds the specified option(s) to the object; does not replace them.

bool ACE_Synch_Options::operator[] ( unsigned long option ) const

Returns true if the specified option(s) are enabled, false otherwise.

void ACE_Synch_Options::set	(	unsigned long	options = `0`,
		const ACE_Time_Value &	timeout = `ACE_Time_Value::zero`,
		const void *	arg = `0`
	)

Initialize the object; arguments are the same as for the constructor.

const ACE_Time_Value * ACE_Synch_Options::time_value ( void ) const

Returns a timeout pointer if (*this)[USE_TIMEOUT] is true, else 0. This should be used with care, e.g., the timeout pointer should not be stored in a manner that will lead to dangling pointers.

const ACE_Time_Value & ACE_Synch_Options::timeout ( void ) const

Returns a reference to the ACE_Time_Value. This value only makes sense if (*this)[USE_TIMEOUT] is true.

void ACE_Synch_Options::timeout ( const ACE_Time_Value & tv )

Set the timeout value. This method does not alter the options; in particular, it doesn't add USE_TIMEOUT to the options when a non-zero timeout is specified as the constructor and set() do.