Switch_lock Class Reference

A lock that implements priority inheritance. More...

#include <switch_lock.h>

List of all members.

Public Member Functions
void	initialize ()
	Initialize Switch_lock.
Context *	lock_owner () const
	Lock owner.
bool	test () const
	Is lock set?.
void	lock ()
	Acquire the lock with priority inheritance.
bool	test_and_set ()
	Acquire the lock with priority inheritance.
void	clear ()
	Free the lock.
Private Member Functions
bool	try_lock ()
	Try to acquire the lock.
Private Attributes
Context *	_lock_owner

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Detailed Description

A lock that implements priority inheritance.

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Member Function Documentation

void Switch_lock::clear (   )

Free the lock. Return the CPU to helper if there is one, since it had to have a higher priority to be able to help (priority may be its own, it may run on a donated timeslice or round robin scheduling may have selected a thread on the same priority level as me)

void Switch_lock::initialize (   )  [inline]

Initialize Switch_lock. Call this function if you cannot guarantee that your Switch_lock instance is allocated from zero-initialized memory.

void Switch_lock::lock (   )

Acquire the lock with priority inheritance. If the lock is occupied, enqueue in list of helpers and lend CPU to current lock owner until we are the lock owner.

Context * Switch_lock::lock_owner (   )  const [inline]

Lock owner. Returns: current owner of the lock. 0 if there is no owner.

bool Switch_lock::test (   )  const [inline]

Is lock set?. Returns: true if lock is set.

bool Switch_lock::test_and_set (   )  [inline]

Acquire the lock with priority inheritance. Returns: true if we owned the lock already. false otherwise.

bool Switch_lock::try_lock (   )  [inline, private]

Try to acquire the lock. Returns: true if successful: current context is now the owner of the lock. false if lock has previously been set. Returns false even if the current context is already the lock owner.

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Member Data Documentation

Context* Switch_lock::_lock_owner [private]

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

• switch_lock.h
• switch_lock.cc
• switch_lock_i.h

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