tatas_lock Struct Reference

A test-and-test-and-set spinlock. More...

#include <tatas.h>

Public Member Functions
	tatas_lock ()
bool	try_lock ()
	Try to acquire the lock immediately. More...
void	acquire ()
	Acquire the lock, spinning as long as necessary. More...
void	release ()
	Release the lock. More...
bool	is_mine () const
	True if this thread is the lock holder. More...

Private Member Functions
void	spin ()
	spin until lock is free More...

Detailed Description

A test-and-test-and-set spinlock.

This lock is good for short, uncontended critical sections. If contention is high, use an mcs_lock. Long critical sections should use pthread_mutex_t.

Tradeoffs are:

• test-and-test-and-set locks: low-overhead but not scalable
• queue-based locks: higher overhead but scalable
• pthread mutexes : very high overhead and blocks, but frees up cpu for other threads when number of cpus is fewer than number of threads

See also

REFSYNC

Constructor & Destructor Documentation

tatas_lock()

tatas_lock::tatas_lock ( )

inline

skip

Member Function Documentation

acquire()

void tatas_lock::acquire ( )

inline

Acquire the lock, spinning as long as necessary.

is_mine()

bool tatas_lock::is_mine ( ) const

inline

True if this thread is the lock holder.

release()

void tatas_lock::release ( )

inline

Release the lock.

spin()

void tatas_lock::spin ( )

inlineprivate

spin until lock is free

try_lock()

bool tatas_lock::try_lock ( )

inline

Try to acquire the lock immediately.

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

• src/common/tatas.h