New MPI_T Events tests and example

events/Makefile

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+
+EXES = events_types events_callbacks events_read_data events_meta_data events_source events_dropped events_example
+
+CC= mpicc
+
+CFLAGS= -O2 -g -Wall
+LIBS=events_common.o
+
+def: clean ${EXES}
+
+events_types : events_types.o events_common.o
+	$(CC) $(CFLAGS) -o $@ $< ${LIBS}
+
+events_callbacks : events_callbacks.o events_common.o
+	$(CC) $(CFLAGS) -o $@ $< ${LIBS}
+
+events_read_data : events_read_data.o events_common.o
+	$(CC) $(CFLAGS) -o $@ $< ${LIBS}
+
+events_meta_data : events_meta_data.o events_common.o
+	$(CC) $(CFLAGS) -o $@ $< ${LIBS}
+
+events_source : events_source.o events_common.o
+	$(CC) $(CFLAGS) -o $@ $< ${LIBS}
+
+events_dropped : events_dropped.o events_common.o
+	$(CC) $(CFLAGS) -o $@ $< ${LIBS}
+
+events_example : events_example.o
+	$(CC) $(CFLAGS) -o $@ $< 
+
+clean:
+	rm -f ${EXES} core.* *.o

events/README.md

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+# MPI_T Events Tests
+
+If the MPI implementation includes support for the MPI_T Events functions as defined in [MPI Standard 4.0](https://www.mpi-forum.org/docs/mpi-4.0/mpi40-report.pdf) and includes some implemented events, these tests will confirm basic functionality as well as some error checking.
+
+## Events Callback Test Requirements
+In order to confirm the MPI_T Events callback functionality, a callback must be registered and triggered by performing relevant MPI activity.
+
+The events_types test will print the list of events available by providing the command line '-l' flag.
+
+The events_callbacks event index can be set for the events_callbacks test with the `-i [number]` flag.
+
+If the default MPI activity in the function generate\_callback\_activity() in events_common.c does not trigger the event callback, custom MPI activity will need to be added.
+
+## Test Behavior
+
+The behavior of each test can be modified with the following command line arguments:
+
+- -d : print internal debugging messages [default: off]
+- -e : print error messages [default: off]
+- -f : perform failure tests [default: off]
+- -i [number] : event index for specific tests [default: 0]
+- -l : list available events (events_types only) [default: off]
+
+## Test Descriptions
+
+- events_callbacks
+  - Register and free a callback function for an event
+  - Get and set event handle and callback info
+- events_dropped
+  - Register a callback function for dropped events
+- events\_meta_data
+  - Get event timestamp and source
+- events\_read_data
+  - Read and copy event data
+- events_source
+  - Get number of source, source info object, and source timestamp
+- events_types
+  - Get number of events and event info object
+
+## Event Callback and Read Data Example
+The events_example.c file has been provided as an example of registering an event callback and reading event data.
+
+## Test Suite And MPI Implementations
+
+Tested with [Open MPI PR #8057](https://github.com/open-mpi/ompi/pull/8057) with pml ob1 module events.