recursive_mutex Class
Represents a mutex type. In contrast to mutex, the behavior of calls to locking methods for objects that are already locked is well-defined.
Syntax
class recursive_mutex;
Members
Public Constructors
| Name | Description |
|---|---|
| recursive_mutex | Constructs a recursive_mutex object. |
| ~recursive_mutex Destructor | Releases any resources that are used by the recursive_mutex object. |
Public Methods
| Name | Description |
|---|---|
| lock | Blocks the calling thread until the thread obtains ownership of the mutex. |
| try_lock | Attempts to obtain ownership of the mutex without blocking. |
| unlock | Releases ownership of the mutex. |
Requirements
Header: <mutex>
Namespace: std
lock
Blocks the calling thread until the thread obtains ownership of the mutex.
void lock();
Remarks
If the calling thread already owns the mutex, the method returns immediately, and the previous lock remains in effect.
recursive_mutex
Constructs a recursive_mutex object that is not locked.
recursive_mutex();
~recursive_mutex
Releases any resources that are used by the object.
~recursive_mutex();
Remarks
If the object is locked when the destructor runs, the behavior is undefined.
try_lock
Attempts to obtain ownership of the mutex without blocking.
bool try_lock() noexcept;
Return Value
true if the method successfully obtains ownership of the mutex or if the calling thread already owns the mutex**; otherwise, **false.
Remarks
If the calling thread already owns the mutex, the function immediately returns true, and the previous lock remains in effect.
unlock
Releases ownership of the mutex.
void unlock();
Remarks
This method releases ownership of the mutex only after it is called as many times as lock and try_lock have been called successfully on the recursive_mutex object.
If the calling thread does not own the mutex, the behavior is undefined.