std::barrier<CompletionFunction>::barrier

 

C++

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Technical specifications

Symbols index

External libraries

 

Concurrency support library

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Free functions for atomic flags atomic_flag_test_and_setatomic_flag_test_and_set_explicit (C++11)(C++11) atomic_flag_clearatomic_flag_clear_explicit (C++11)(C++11) atomic_flag_testatomic_flag_test_explicit (C++20)(C++20) atomic_flag_waitatomic_flag_wait_explicit (C++20)(C++20) atomic_flag_notify_one (C++20) atomic_flag_notify_all (C++20) Memory ordering memory_order (C++11) kill_dependency (C++11) atomic_thread_fence (C++11) atomic_signal_fence (C++11) Mutual exclusion mutex (C++11) recursive_mutex (C++11) shared_mutex (C++17) timed_mutex (C++11) recursive_timed_mutex (C++11) shared_timed_mutex (C++14) Generic lock management lock_guard (C++11) scoped_lock (C++17) unique_lock (C++11) shared_lock (C++14) defer_lock_ttry_to_lock_tadopt_lock_t (C++11)(C++11)(C++11) lock (C++11) try_lock (C++11) defer_locktry_to_lockadopt_lock (C++11)(C++11)(C++11) once_flag (C++11) call_once (C++11) Condition variables condition_variable (C++11) condition_variable_any (C++11) notify_all_at_thread_exit (C++11) cv_status (C++11) Semaphores counting_semaphorebinary_semaphore (C++20)(C++20) Latches and barriers latch (C++20) barrier (C++20) Futures promise (C++11) future (C++11) shared_future (C++11) packaged_task (C++11) async (C++11) launch (C++11) future_status (C++11) future_error (C++11) future_category (C++11) future_errc (C++11)

 

std::barrier

Member functions

barrier::barrier

barrier::~barrier

barrier::arrive

barrier::wait

barrier::arrive_and_wait

barrier::arrive_and_drop

Constants

barrier::max

 

constexpr explicit barrier( std::ptrdiff_t expected,                             CompletionFunction f = CompletionFunction());	(1)	(since C++20)
barrier( const barrier & ) = delete;	(2)	(since C++20)

1) Sets the both initial expected count for each phase and the current expected count for the first phase to expected, initializes the completion function object with std::move(f), and then starts the first phase. The behavior is undefined if expected is negative or greater than max().

2) Copy constructor is deleted. barrier is neither copyable nor movable.

Parameters

expected	-	initial value of the expected count
f	-	completion function object to be called on phase completion step

Exceptions

1) Any exception thrown by CompletionFunction's move constructor.

Notes

expected is permitted to be zero. However, calling any non-static member function other than the destructor on such barrier results in undefined behavior. In other words, such barrier can only be destroyed.