std::defer_lock, std::try_to_lock, std::adopt_lock

 

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constexpr defer_lock_t defer_lock = std::defer_lock_t();		(since C++11)
constexpr try_to_lock_t try_to_lock = std::try_to_lock_t();		(since C++11)
constexpr adopt_lock_t adopt_lock = std::adopt_lock_t();		(since C++11)

std::defer_lock, std::try_to_lock and std::adopt_lock are instances of empty struct tag types std::defer_lock_t, std::try_to_lock_t and std::adopt_lock_t respectively. They are used to specify locking strategy.

Type	Effect(s)
defer_lock_t	do not acquire ownership of the mutex
try_to_t	try to acquire ownership of the mutex without blocking
adopt_lock_t	assume the calling thread already has ownership of the mutex

See also

defer_lock_t try_to_lock_t adopt_lock_t	tag type used to specify locking strategy (class)