atomic_exchange#

Defined in header <Kokkos_Atomic.hpp> which is included from <Kokkos_Core.hpp>

Usage#

auto old = atomic_exchange(&obj, desired);

Atomically replaces the value of obj with desired and returns the value before the call.

Description#

template<class T>
T atomic_exchange(T *ptr, std::type_identity_t<T> val);#

Atomically writes val into *ptr and returns the original value of *ptr.

{ auto old = *ptr; *ptr = val; return old; }

Parameters:

  • ptr – address of the object to modify

  • val – the value to store in the referenced object

Returns:

the value held previously by the object pointed to by ptr

See also#

  • atomic_load: atomically obtains the value of the referenced object

  • atomic_store: atomically replaces the value of the referenced object with a non-atomic argument

  • atomic_compare_exchange: atomically compares the value of the referenced object with non-atomic argument and performs atomic exchange if equal or atomic load if not