Class that acquires, renews, and releases a writer lock that is local to the process. More...

#include <Local_Tokens.h>

Inheritance diagram for ACE_Local_WLock:

Collaboration diagram for ACE_Local_WLock:

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Public Member Functions
	ACE_Local_WLock (const ACE_TCHAR *token_name=0, int ignore_deadlock=0, int debug=0)

	~ACE_Local_WLock ()
	Destructor.

void	dump () const
	Dump the state of the class.

virtual int	type () const
	Returns ACE_RW_Token::WLOCK.

virtual ACE_Token_Proxy *	clone () const
	Return deep copy.

Public Member Functions inherited from ACE_Token_Proxy
	ACE_Token_Proxy ()
	Construction.

virtual	~ACE_Token_Proxy ()
	Destructor.

virtual int	open (const ACE_TCHAR *name, int ignore_deadlock=0, int debug=0)

virtual int	acquire (int notify=0, void(sleep_hook)(void )=0, ACE_Synch_Options &options=ACE_Synch_Options::defaults)

virtual int	renew (int requeue_position=-1, ACE_Synch_Options &options=ACE_Synch_Options::defaults)
	Calls renew on the token. Blocks the calling thread if would block.

virtual int	tryacquire (void(sleep_hook)(void )=0)
	Calls renew on the token.

virtual int	release (ACE_Synch_Options &options=ACE_Synch_Options::defaults)
	Calls release on the token.

virtual int	remove (ACE_Synch_Options &options=ACE_Synch_Options::defaults)
	Calls remove on the token.

virtual int	acquire_read (int notify=0, void(sleep_hook)(void )=0, ACE_Synch_Options &options=ACE_Synch_Options::defaults)

virtual int	acquire_write (int notify=0, void(sleep_hook)(void )=0, ACE_Synch_Options &options=ACE_Synch_Options::defaults)

virtual int	tryacquire_read (void(sleep_hook)(void )=0)

virtual int	tryacquire_write (void(sleep_hook)(void )=0)

virtual const ACE_TCHAR *	client_id () const

virtual void	client_id (const ACE_TCHAR *client_id)

virtual const ACE_TCHAR *	name () const

virtual void	sleep_hook ()

virtual void	token_acquired (ACE_TPQ_Entry *)

virtual const ACE_TCHAR *	owner_id ()
	The client id of the current token holder.

void	dump () const
	Dump the state of the class.

Protected Member Functions
ACE_Tokens *	create_token (const ACE_TCHAR *name)
	Return a new ACE_Local_Mutex.

Protected Member Functions inherited from ACE_Token_Proxy
	ACE_Token_Proxy (const ACE_Token_Proxy &)
	Duplication.

int	handle_options (ACE_Synch_Options &options, ACE_TOKEN_CONST::COND_VAR &cv)
	Handles cond_var waits.

Additional Inherited Members
Protected Attributes inherited from ACE_Token_Proxy
int	ignore_deadlock_
	If this is set, we ignore deadlock.

int	debug_
	Print a bunch of debug messages.

ACE_Tokens *	token_

ACE_TSS_TPQ_Entry	waiter_
	Waiter info used for asynchronous transactions.

Detailed Description

Class that acquires, renews, and releases a writer lock that is local to the process.

This class implements the writer interface to canonical readers/writer locks. Multiple readers can hold the lock simultaneously when no writers have the lock. Alternatively, when a writer holds the lock, no other participants (readers or writers) may hold the lock. This class is a more general-purpose synchronization mechanism than SunOS 5.x WLock. For example, it implements "recursive WLock" semantics, where a thread that owns the token can reacquire it without deadlocking. In addition, threads that are blocked awaiting the token are serviced in strict FIFO order as other threads release the token (SunOS 5.x WLocks don't strictly enforce an acquisition order). The interfaces for acquire, tryacquire, renew, release, etc. are defined in ACE_Token_Proxy. The semantics for ACE_Local_WLock are that of a readers/writers lock. Acquire for this class implies a writer acquisition. That is, only one client may hold the lock for writing.

Constructor & Destructor Documentation

◆ ACE_Local_WLock()

ACE_Local_WLock::ACE_Local_WLock	(	const ACE_TCHAR *	token_name = 0,
		int	ignore_deadlock = 0,
		int	debug = 0 )

inline

Constructor.

Parameters

token_name	Uniquely id's the token.
ignore_deadlock	Will allow deadlock to occur (useful for testing).
debug	Prints a bunch of messages.

◆ ~ACE_Local_WLock()

ACE_Local_WLock::~ACE_Local_WLock ( )

Destructor.

Member Function Documentation

◆ clone()

ACE_Token_Proxy * ACE_Local_WLock::clone ( ) const

virtual

Return deep copy.

Implements ACE_Token_Proxy.

◆ create_token()

ACE_Tokens * ACE_Local_WLock::create_token ( const ACE_TCHAR * name )

protectedvirtual

Return a new ACE_Local_Mutex.

Implements ACE_Token_Proxy.

◆ dump()

void ACE_Local_WLock::dump ( ) const

Dump the state of the class.

◆ type()

int ACE_Local_WLock::type ( ) const

virtual

Returns ACE_RW_Token::WLOCK.

Reimplemented from ACE_Token_Proxy.

The documentation for this class was generated from the following files:

Public Member Functions

Protected Member Functions

Additional Inherited Members