Public Member Functions | |
ScopedLock (Mutex &m) | |
~ScopedLock () | |
Private Attributes | |
Mutex & | mutex |
Scoped lock class. When you declare an object of this type, you have to pass it a mutex, which is locked in the constructor of this class and unlocked in the destructor. The lock is thus held during the entire lifetime of this object, i.e. until the end of the present scope, which explains where the name comes from. This pattern of using locks with mutexes follows the resource-acquisition-is-initialization pattern, and was used first for mutexes by Doug Schmidt. It has the advantage that locking a mutex this way is thread-safe, i.e. when an exception is thrown between the locking and unlocking point, the destructor makes sure that the mutex is unlocked; this would not automatically be the case when you lock and unlock the mutex "by hand", i.e. using acquire
and release
.
Threads::Mutex::ScopedLock::ScopedLock | ( | Mutex & | m | ) | [inline] |
Constructor. Lock the mutex.
References Threads::Mutex::acquire(), and mutex.
Threads::Mutex::ScopedLock::~ScopedLock | ( | ) | [inline] |
Destructor. Unlock the mutex. Since this is a dummy mutex class, this of course does nothing.
References mutex, and Threads::Mutex::release().
Mutex& Threads::Mutex::ScopedLock::mutex [private] |
Store the address of the mutex object.
Referenced by ScopedLock(), and ~ScopedLock().