Artificial Functions

Artificial functions are constructed and put onto the User mode call stacks reflecting events in which a thread was in some state within the OpenMP runtime library.

The following artificial functions are defined; each is followed by a description of its function:

• <OMP-overhead>— executing in the OpenMP library

• <OMP-idle>— slave thread, waiting for work

• <OMP-reduction>— thread performing a reduction operation

• <OMP-implicit_barrier>— thread waiting at an implicit barrier

• <OMP-explicit_barrier>— thread waiting at an explicit barrier

• <OMP-lock_wait>— thread waiting for a lock

• <OMP-critical_section_wait>— thread waiting to enter a critical section

• <OMP-ordered_section_wait>— thread waiting for its turn to enter an ordered section

When a thread is in an OpenMP runtime state corresponding to one of those functions, the corresponding function is added as the leaf function on the stack. When a thread’s leaf function is anywhere in the OpenMP runtime, it is replaced by <OMP-overhead> as the leaf function. Otherwise, all PCs from the OpenMP runtime are omitted from the user-mode stack.