Helping_lock Class Reference

A wrapper for Switch_lock that works even when the threading system has not been intialized yet. More...

#include <helping_lock.h>

List of all members.

Public Member Functions
	Helping_lock ()
	Constructor.
bool	test_and_set ()
	Acquire the lock with priority inheritance.
void	lock ()
	Acquire the lock with priority inheritance.
bool	test ()
	Is lock set?.
void	clear ()
	Free the lock.
Context *	lock_owner ()
	Lock owner.
Static Public Attributes
static bool	threading_system_active = false
	Threading system activated.
Private Attributes
Switch_lock	_switch_lock

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Detailed Description

A wrapper for Switch_lock that works even when the threading system has not been intialized yet.

This wrapper is necessary because most lock-protected objects are initialized before the threading system has been fired up.

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Constructor & Destructor Documentation

Helping_lock::Helping_lock (   )  [inline]

Constructor.

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Member Function Documentation

void Helping_lock::clear (   )  [inline]

Free the lock. Return the CPU to helper or next lock owner, whoever has the higher priority, given that thread's priority is higher that our's.

void Helping_lock::lock (   )  [inline]

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 * Helping_lock::lock_owner (   )  [inline]

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

bool Helping_lock::test (   )  [inline]

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

bool Helping_lock::test_and_set (   )

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

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Member Data Documentation

Switch_lock Helping_lock::_switch_lock [private]

bool Helping_lock::threading_system_active = false [static]

Threading system activated.

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

• helping_lock.h
• helping_lock.cc

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