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MPI_Win_test - Attempts to complete an RMA exposure epoch; a nonblocking
version of MPI_Win_wait
#include <mpi.h>
int MPI_Win_test(MPI_Win win, int *flag)
INCLUDE ’mpif.h’
MPI_WIN_TEST( WIN, FLAG, IERROR)
INTEGER WIN, IERROR
#include <mpi.h>
bool MPI::Win::Test() const
- win
- Window object (handle)
- IERROR
- Fortran
only: Error status (integer).
- flag
- The returning state of the test for
epoch closure.
MPI_Win_test is a one-sided MPI communication
synchronization call, a nonblocking version of MPI_Win_wait. It returns
flag = true if MPI_Win_wait would return, flag = false otherwise. The effect
of return of MPI_Win_test with flag = true is the same as the effect of
a return of MPI_Win_wait. If flag = false is returned, then the call has
no visible effect.
Invoke MPI_Win_test only where MPI_Win_wait can be invoked.
Once the call has returned flag = true, it must not be invoked anew, until
the window is posted anew.
Almost all MPI routines return an error
value; C routines as the value of the function and Fortran routines in
the last argument. C++ functions do not return errors. If the default error
handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception
mechanism will be used to throw an MPI::Exception object.
Before the error
value is returned, the current MPI error handler is called. By default,
this error handler aborts the MPI job, except for I/O function errors. The
error handler may be changed with MPI_Win_set_errhandler; the predefined
error handler MPI_ERRORS_RETURN may be used to cause error values to be
returned. Note that MPI does not guarantee that an MPI program can continue
past an error.
MPI_Win_post MPI_Win_wait
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