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8.2.14 _gfortran_caf_event_query — Query event count

Return the event count of the specified event count.
void _gfortran_caf_event_query (caf_token_t token, size_t index, int image_index, int *count, int *stat)

token intent(in) An opaque pointer identifying the coarray.
index Array index; first array index is 0. For scalars, it is always 0.
image_index The ID of the remote image; must be a positive number; zero indicates the current image when accessed noncoindexed.
count intent(out) The number of events currently posted to the event variable
stat intent(out) Stores the STAT=; may be NULL

The typical use is to check the local even variable to only call event_wait when the data is available. However, a coindexed variable is permitted; there is no ordering or synchronization implied. It acts like an atomic fetch of the value of the event variable.