31 Atomic operations library [atomics]

31.10 Flag type and operations [atomics.flag]

namespace std {
  struct atomic_flag {
    bool test(memory_order = memory_order::seq_cst) const volatile noexcept;
    bool test(memory_order = memory_order::seq_cst) const noexcept;
    bool test_and_set(memory_order = memory_order::seq_cst) volatile noexcept;
    bool test_and_set(memory_order = memory_order::seq_cst) noexcept;
    void clear(memory_order = memory_order::seq_cst) volatile noexcept;
    void clear(memory_order = memory_order::seq_cst) noexcept;

    void wait(bool, memory_order = memory_order::seq_cst) const volatile noexcept;
    void wait(bool, memory_order = memory_order::seq_cst) const noexcept;
    void notify_one() volatile noexcept;
    void notify_one() noexcept;
    void notify_all() volatile noexcept;
    void notify_all() noexcept;

    atomic_flag() noexcept = default;
    atomic_flag(const atomic_flag&) = delete;
    atomic_flag& operator=(const atomic_flag&) = delete;
    atomic_flag& operator=(const atomic_flag&) volatile = delete;
  };
}
The atomic_­flag type provides the classic test-and-set functionality.
It has two states, set and clear.
Operations on an object of type atomic_­flag shall be lock-free.
Note
:
Hence the operations should also be address-free.
— end note
 ]
The atomic_­flag type is a standard-layout struct.
It has a trivial default constructor and a trivial destructor.
#define ATOMIC_FLAG_INIT see below
Remarks: The macro ATOMIC_­FLAG_­INIT shall be defined in such a way that it can be used to initialize an object of type atomic_­flag to the clear state.
The macro can be used in the form:
atomic_flag guard = ATOMIC_FLAG_INIT;
It is unspecified whether the macro can be used in other initialization contexts.
For a complete static-duration object, that initialization shall be static.
Unless initialized with ATOMIC_­FLAG_­INIT, it is unspecified whether an atomic_­flag object has an initial state of set or clear.
bool atomic_flag_test(const volatile atomic_flag* object) noexcept; bool atomic_flag_test(const atomic_flag* object) noexcept; bool atomic_flag_test_explicit(const volatile atomic_flag* object, memory_order order) noexcept; bool atomic_flag_test_explicit(const atomic_flag* object, memory_order order) noexcept; bool atomic_flag::test(memory_order order = memory_order::seq_cst) const volatile noexcept; bool atomic_flag::test(memory_order order = memory_order::seq_cst) const noexcept;
For atomic_­flag_­test, let order be memory_­order​::​seq_­cst.
Expects: order is neither memory_­order​::​release nor memory_­order​::​acq_­rel.
Effects: Memory is affected according to the value of order.
Returns: Atomically returns the value pointed to by object or this.
bool atomic_flag_test_and_set(volatile atomic_flag* object) noexcept; bool atomic_flag_test_and_set(atomic_flag* object) noexcept; bool atomic_flag_test_and_set_explicit(volatile atomic_flag* object, memory_order order) noexcept; bool atomic_flag_test_and_set_explicit(atomic_flag* object, memory_order order) noexcept; bool atomic_flag::test_and_set(memory_order order = memory_order::seq_cst) volatile noexcept; bool atomic_flag::test_and_set(memory_order order = memory_order::seq_cst) noexcept;
Effects: Atomically sets the value pointed to by object or by this to true.
Memory is affected according to the value of order.
These operations are atomic read-modify-write operations ([intro.multithread]).
Returns: Atomically, the value of the object immediately before the effects.
void atomic_flag_clear(volatile atomic_flag* object) noexcept; void atomic_flag_clear(atomic_flag* object) noexcept; void atomic_flag_clear_explicit(volatile atomic_flag* object, memory_order order) noexcept; void atomic_flag_clear_explicit(atomic_flag* object, memory_order order) noexcept; void atomic_flag::clear(memory_order order = memory_order::seq_cst) volatile noexcept; void atomic_flag::clear(memory_order order = memory_order::seq_cst) noexcept;
Requires: The order argument shall not be memory_­order​::​consume, memory_­order​::​acquire, nor memory_­order​::​acq_­rel.
Effects: Atomically sets the value pointed to by object or by this to false.
Memory is affected according to the value of order.
void atomic_flag_wait(const volatile atomic_flag* object, bool old) noexcept; void atomic_flag_wait(const atomic_flag* object, bool old) noexcept; void atomic_flag_wait_explicit(const volatile atomic_flag* object, bool old, memory_order order) noexcept; void atomic_flag_wait_explicit(const atomic_flag* object, bool old, memory_order order) noexcept; void atomic_flag::wait(bool old, memory_order order = memory_order::seq_cst) const volatile noexcept; void atomic_flag::wait(bool old, memory_order order = memory_order::seq_cst) const noexcept;
For atomic_­flag_­wait, let order be memory_­order​::​seq_­cst.
Let flag be object for the non-member functions and this for the member functions.
Expects: order is neither memory_­order​::​release nor memory_­order​::​acq_­rel.
Effects: Repeatedly performs the following steps, in order:
  • Evaluates flag->test(order) != old.
  • If the result of that evaluation is true, returns.
  • Blocks until it is unblocked by an atomic notifying operation or is unblocked spuriously.
Remarks: This function is an atomic waiting operation ([atomics.wait]).
void atomic_flag_notify_one(volatile atomic_flag* object) noexcept; void atomic_flag_notify_one(atomic_flag* object) noexcept; void atomic_flag::notify_one() volatile noexcept; void atomic_flag::notify_one() noexcept;
Effects: Unblocks the execution of at least one atomic waiting operation that is eligible to be unblocked ([atomics.wait]) by this call, if any such atomic waiting operations exist.
Remarks: This function is an atomic notifying operation ([atomics.wait]).
void atomic_flag_notify_all(volatile atomic_flag* object) noexcept; void atomic_flag_notify_all(atomic_flag* object) noexcept; void atomic_flag::notify_all() volatile noexcept; void atomic_flag::notify_all() noexcept;
Effects: Unblocks the execution of all atomic waiting operations that are eligible to be unblocked ([atomics.wait]) by this call.
Remarks: This function is an atomic notifying operation ([atomics.wait]).