Lock2 Class Reference

Ephemeral double mutex locking object. More...

#include <yateclass.h>

Public Member Functions
	Lock2 (Mutex *mx1, Mutex *mx2, long maxwait=-1)
	Lock2 (Mutex &mx1, Mutex &mx2, long maxwait=-1)
	~Lock2 ()
bool	locked () const
bool	lock (Mutex *mx1, Mutex *mx2, long maxwait=-1)
bool	lock (Mutex &mx1, Mutex &mx2, long maxwait=-1)
void	drop ()

Detailed Description

Ephemeral double mutex locking object.

A dual lock is a stack allocated (automatic) object that locks a pair of mutexes on creation and unlocks them on destruction. The mutexes are always locked in the same order to prevent trivial deadlocks

Constructor & Destructor Documentation

Lock2 ( Mutex *  mx1, Mutex *  mx2, long  maxwait = -1  )

inline

Create the dual lock, try to lock each mutex

Parameters

mx1	Pointer to the first mutex to lock
mx2	Pointer to the second mutex to lock
maxwait	Time in microseconds to wait for each mutex, -1 wait forever

References Lock2::lock().

Lock2 ( Mutex &  mx1, Mutex &  mx2, long  maxwait = -1  )

inline

Create the dual lock, try to lock each mutex

Parameters

mx1	Reference to the first mutex to lock
mx2	Reference to the second mutex to lock
maxwait	Time in microseconds to wait for each mutex, -1 wait forever

References Lock2::lock().

~Lock2 ( )

inline

Destroy the lock, unlock the mutex if it was locked

References Lock2::drop().

Member Function Documentation

void drop

(

)

Unlock both mutexes if they were locked and drop the references

Referenced by Lock2::~Lock2().

bool lock	(	Mutex *	mx1,
		Mutex *	mx2,
		long	maxwait = -1
	)

Lock in a new pair of mutexes. Any existing locks are dropped

Parameters

mx1	Pointer to the first mutex to lock
mx2	Pointer to the second mutex to lock
maxwait	Time in microseconds to wait for each mutex, -1 wait forever

Returns

True on success - non-NULL mutexes locked

Referenced by Lock2::lock(), and Lock2::Lock2().

bool lock ( Mutex &  mx1, Mutex &  mx2, long  maxwait = -1  )

inline

Lock in a new pair of mutexes

Parameters

mx1	Reference to the first mutex to lock
mx2	Reference to the second mutex to lock
maxwait	Time in microseconds to wait for each mutex, -1 wait forever

Returns

True on success - both locked

References Lock2::lock().

bool locked ( ) const

inline

Check if the locking succeeded

Returns

True if all mutexes were locked

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

• yateclass.h