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MPI_Win_test(3) man page (version 1.6.4)

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MPI_Win_test - Attempts to complete an RMA exposure epoch; a nonblocking

version of MPI_Win_wait


C Syntax

#include <mpi.h>
int MPI_Win_test(MPI_Win win, int *flag)

Fortran Syntax

INCLUDE ’mpif.h’

C++ Syntax

#include <mpi.h>
bool MPI::Win::Test() const

Input Parameters

Window object (handle)

Output Parameters

Fortran only: Error status (integer).
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 ag = true if MPI_Win_wait would return, ag = 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 ag = 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 ag = 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.

See Also

MPI_Win_post MPI_Win_wait

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