- Main Page
- Modules
- Namespaces
- Classes
- Files
- Related Pages

- Class List
- Class Hierarchy
- Class Members

# tbb::spin_rw_mutex_v3::scoped_lock Class Reference

The scoped locking pattern. More...

`#include <spin_rw_mutex.h>`

List of all members.

## Public Member Functions
| scoped_lock ()
| Construct lock that has not acquired a mutex.
| scoped_lock (spin_rw_mutex &m, bool write=true)
| Acquire lock on given mutex.
| ~scoped_lock ()
| Release lock (if lock is held).
void | acquire (spin_rw_mutex &m, bool write=true)
| Acquire lock on given mutex.
bool | upgrade_to_writer ()
| Upgrade reader to become a writer.
void | release ()
| Release lock.
bool | downgrade_to_reader ()
| Downgrade writer to become a reader.
bool | try_acquire (spin_rw_mutex &m, bool write=true)
| Try acquire lock on given mutex.
## Protected Attributes
spin_rw_mutex * | mutex
| The pointer to the current mutex that is held, or NULL if no mutex is held.
bool | is_writer
| If mutex!=NULL, then is_writer is true if holding a writer lock, false if holding a reader lock.

## Detailed Description

The scoped locking pattern.

It helps to avoid the common problem of forgetting to release lock. It also nicely provides the "node" for queuing locks.

## Constructor & Destructor Documentation

tbb::spin_rw_mutex_v3::scoped_lock::scoped_lock | ( |  | ) | `[inline]`

Construct lock that has not acquired a mutex.

Equivalent to zero-initialization of *this.

## Member Function Documentation

bool tbb::spin_rw_mutex_v3::scoped_lock::upgrade_to_writer | ( |  | ) | `[inline]`

Upgrade reader to become a writer.

Returns whether the upgrade happened without releasing and re-acquiring the lock

## Member Data Documentation

bool tbb::spin_rw_mutex_v3::scoped_lock::is_writer`[protected]`

If mutex!=NULL, then is_writer is true if holding a writer lock, false if holding a reader lock.

Not defined if not holding a lock.

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

- spin_rw_mutex.h

Copyright © 2005-2012 Intel Corporation. All Rights Reserved.

Intel, Pentium, Intel Xeon, Itanium, Intel XScale and VTune are registered trademarks or trademarks of Intel Corporation or its subsidiaries in the United States and other countries.

* Other names and brands may be claimed as the property of others.