recursive_timed_mutex Class
Represents a timed mutex type. Objects of this type are used to enforce mutual exclusion by using time-limited blocking within a program. Unlike objects of type timed_mutex, the effect of calling locking methods for recursive_timed_mutex objects is well-defined.
Syntax
class recursive_timed_mutex;
Members
Public Constructors
| Name | Description |
|---|---|
| recursive_timed_mutex | Constructs a recursive_timed_mutex object that's not locked. |
| ~recursive_timed_mutex Destructor | Releases any resources that are used by the recursive_timed_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. |
| try_lock_for | Attempts to obtain ownership of the mutex for a specified time interval. |
| try_lock_until | Attempts to obtain ownership of the mutex until a specified time. |
| 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_timed_mutex Constructor
Constructs a recursive_timed_mutex object that is not locked.
recursive_timed_mutex();
~recursive_timed_mutex Destructor
Releases any resources that are used by the recursive_timed_mutex object.
~recursive_timed_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 obtained 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.
try_lock_for
Attempts to obtain ownership of the mutex without blocking.
template <class Rep, class Period>
bool try_lock_for(const chrono::duration<Rep, Period>& Rel_time);
Parameters
Rel_time
A chrono::duration object that specifies the maximum amount of time that the method attempts to obtain ownership of the mutex.
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 method immediately returns true, and the previous lock remains in effect.
try_lock_until
Attempts to obtain ownership of the mutex without blocking.
template <class Clock, class Duration>
bool try_lock_for(const chrono::time_point<Clock, Duration>& Abs_time);
bool try_lock_until(const xtime* Abs_time);
Parameters
Abs_time
A point in time that specifies the threshold after which the method no longer attempts to obtain ownership of the mutex.
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 method 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, try_lock, try_lock_for, and try_lock_until have been called successfully on the recursive_timed_mutex object.
If the calling thread does not own the mutex, the behavior is undefined.