Luna::atom_compare_exchange_usize

usize atom_compare_exchange_usize(usize volatile *dst, usize exchange, usize comperand)

Atomically compares the value of the variable with the specified comperand, and sets the variable to the specified value if equal.

Parameters

• in dst

  The pointer to the variable that needs to be compared.

• in exchange

  The value to set to the variable if *dst == comperand.

• in comperand

  The value to compare with.

Return value

Returns the value of the variable before this operation took place.

Remark

See remarks of atom_compare_exchange_i32 for details.