libgomp: Add documentation for omp_fulfill_event runtime function

2021-01-25  Kwok Cheung Yeung  <kcy@codesourcery.com>

	libgomp/
	* libgomp.texi (omp_fulfill_event): New entry.

libgomp/libgomp.texi

@@ -210,6 +210,10 @@ Portable, thread-based, wall clock timer.
 
 * omp_get_wtick::            Get timer precision.
 * omp_get_wtime::            Elapsed wall clock time.
+
+Support for event objects.
+
+* omp_fulfill_event::        Fulfill and destroy an OpenMP event.
 @end menu
 
 
@@ -1401,6 +1405,36 @@ guaranteed not to change during the execution of the program.
 
 
 
+@node omp_fulfill_event
+@section @code{omp_fulfill_event} -- Fulfill and destroy an OpenMP event
+@table @asis
+@item @emph{Description}:
+Fulfill the event associated with the event handle argument.  Currently, it
+is only used to fulfill events generated by detach clauses on task
+constructs - the effect of fulfilling the event is to allow the task to
+complete.
+
+The result of calling @code{omp_fulfill_event} with an event handle other
+than that generated by a detach clause is undefined.  Calling it with an
+event handle that has already been fulfilled is also undefined.
+
+@item @emph{C/C++}:
+@multitable @columnfractions .20 .80
+@item @emph{Prototype}: @tab @code{void omp_fulfill_event(omp_event_handle_t event);}
+@end multitable
+
+@item @emph{Fortran}:
+@multitable @columnfractions .20 .80
+@item @emph{Interface}: @tab @code{subroutine omp_fulfill_event(event)}
+@item                   @tab @code{integer (kind=omp_event_handle_kind) :: event}
+@end multitable
+
+@item @emph{Reference}:
+@uref{https://www.openmp.org, OpenMP specification v5.0}, Section 3.5.1.
+@end table
+
+
+
 @c ---------------------------------------------------------------------
 @c OpenMP Environment Variables
 @c ---------------------------------------------------------------------