The copy is performed after the team is formed and prior to the execution of the associated structured block. For variables of non-array type, the copy is by copy assignment. For an array of elements of non-array type, each element is copied as if by assignment from an element of the array of the primary thread to the corresponding element of the array of all other threads.

For class types, the copy assignment operator is invoked. The order in which copy assignment operators for different variables of the same class type are invoked is unspecified.

The copy is performed, as if by assignment, after the team is formed and prior to the execution of the associated structured block.

Named variables that appear in a threadprivate common block may be specified. The whole common block does not need to be specified.

On entry to any parallel region, each thread’s copy of a variable that is affected by a copyin clause for the parallel region will acquire the type parameters, allocation, association, and definition status of the copy of the primary thread, according to the following rules:

• If the original list item has the POINTER attribute, each copy receives the same association status as that of the copy of the primary thread as if by pointer assignment.
• If the original list item does not have the POINTER attribute, each copy becomes defined with the value of the copy of the primary thread as if by intrinsic assignment unless the list item has a type bound procedure as a defined assignment. If the original list item that does not have the POINTER attribute has the allocation status of unallocated, each copy will have the same status.
• If the original list item is unallocated or unassociated, each copy inherits the declared type parameters and the default type parameter values from the original list item.