#include <opennurbs_lock.h>

Public Types
enum	: int { UnlockedValue = 0, DefaultLockedValue = 1, InvalidLockValue = -1 }
	ON_Lock::InvalidLockValue (= -1) may never be used as a lock value. More...

Public Member Functions
	ON_Lock ()=default

	~ON_Lock ()=default

int	BreakLock ()

bool	GetDefaultLock ()

bool	GetLock (int lock_value)

int	IsLocked ()

bool	ReturnDefaultLock ()

bool	ReturnLock (int lock_value)

Detailed Description

THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY. ALL IMPLIED WARRANTIES OF FITNESS FOR ANY PARTICULAR PURPOSE AND OF MERCHANTABILITY ARE HEREBY DISCLAIMED.

For complete openNURBS copyright information see http://www.opennurbs.org. Description: ON_Lock is a thread safe lock semephore. It is implemented using platform specific compare and set functions.

Member Enumeration Documentation

◆ anonymous enum

anonymous enum : int

ON_Lock::InvalidLockValue (= -1) may never be used as a lock value.

Copy constructor and operator= are implicitly deleted because __atomic_base<int, false> has a deleted copy constructor ON_Lock(const ON_Lock&) = default; ON_Lock& operator=(const ON_Lock&) = default;

Enumerator
UnlockedValue
DefaultLockedValue
InvalidLockValue

Constructor & Destructor Documentation

◆ ON_Lock()

ON_Lock::ON_Lock ( )

default

◆ ~ON_Lock()

ON_Lock::~ON_Lock ( )

default

Member Function Documentation

◆ BreakLock()

int ON_Lock::BreakLock ( )

Description: Unconditionally sets the lock value to ON_Lock::UnlockedValue. Returns: previous value of the lock. ON_Lock::UnlockedValue indicates the lock was available otherwise the lock passed to GetLock() is returned

◆ GetDefaultLock()

bool ON_Lock::GetDefaultLock ( )

Description: Calls GetLock(ON_Lock::DefaultLockedValue); Returns: True if the lock state was unlocked and the current lock value was changed from ON_Lock::UnlockedValue to ON_Lock::DefaultLockedValue. False otherwise.

◆ GetLock()

bool ON_Lock::GetLock ( int lock_value )

Parameters: lock_value - [in] any value except ON_Lock::UnlockedValue or ON_Lock::InvalidLockValue. Typically ON_Lock::DefaultLockedValue is used. Returns: True if the lock_value parameter was valid and the current lock value was changed from ON_Lock::UnlockedValue to lock_value. False otherwise.

◆ IsLocked()

int ON_Lock::IsLocked ( )

Returns: Current lock value ON_Lock::UnlockedValue indicates the the resource protected by the lock is available.

◆ ReturnDefaultLock()

bool ON_Lock::ReturnDefaultLock ( )

Description: Calls ReturnLock(ON_Lock::DefaultLockedValue); Returns: True if the lock state was locked with a locak value = ON_Lock::DefaultLockedValue and the current lock value was changed from ON_Lock::DefaultLockedValue to ON_Lock::UnlockedValue. False otherwise.

◆ ReturnLock()

bool ON_Lock::ReturnLock ( int lock_value )

Parameters: lock_value - [in] any value except ON_Lock::UnlockedValue or ON_Lock::InvalidLockValue. Typically this is the value that was passed to GetLock(). Returns: True if the lock_value parameter was valid and the current lock value was changed from that value to zero. False otherwise.

Public Types

Public Member Functions