atomic<T, addressSpace> - syclreference.com

Implementation of the SYCL atomic class according to 1.2 spec. (section 3.8). On host, calls C++ atomic functions on an std::atomic; on device uses SPIR-mangled OpenCL 1.2 functions to achieve same result.

template <typename T, access::address_space addressSpace>
struct cl::sycl::atomic;

Member Functions

(constructor)
compare_exchange_strong	Atomically compare and optionally exchange expected with m_data. Calls C++11 equivalent on host, has to be implemented “by hand” on device because OpenCL 1.2 and C++ 11 have different semantics for compare and exchange. If m_data == expected, performs m_data = desired and returns true. Otherwise, performs expected = m_data and returns false.
exchange	Atomically exchange operand with *m_data.
fetch_add	Atomically add operand to m_data. param operand the value to add to m_data. param mem_order the ordering to use. Can only be memory_order_relaxed. return the old value of *m_data.
fetch_and	Atomically bitwise-and operand with *m_data.
fetch_max	Atomically compare operand to m_data, storing the larger of the two in m_data.
fetch_min	Atomically compare operand to m_data, storing the smaller of the two in m_data.
fetch_or	Atomically bitwise-or operand with *m_data.
fetch_sub	Atomically subtract operand from *m_data.
fetch_xor	Atomically bitwise-xor operand with *m_data.
load	Atomically load from m_data. Calls C++11 equivalent on host, on device it either calls atomic_add with operand = 0, discarding the result.
store	Atomically store operand in m_data. Calls C++11 equivalent on host, on device it calls exchange, discarding the result.