MPI_Irecv - Online Linux Manual PageSection : 3
Updated : Jan 21, 2016
Source : 1.10.2
Note : Open MPI
NAMEMPI_Irecv − Starts a standard-mode, nonblocking receive.
SYNTAX
C Syntax#include <mpi.h>
int MPI_Irecv(void *buf, int count, MPI_Datatype datatype,
int source, int tag, MPI_Comm comm, MPI_Request *request)
Fortran SyntaxINCLUDE 'mpif.h'
MPI_IRECV(BUF, COUNT, DATATYPE, SOURCE, TAG, COMM, REQUEST,
IERROR)
<type> BUF(*)
INTEGER COUNT, DATATYPE, SOURCE, TAG, COMM, REQUEST, IERROR
C++ Syntax#include <mpi.h>
Request Comm::Irecv(void* buf, int count, const Datatype&
datatype, int source, int tag) const
INPUT PARAMETERSbuf Initial address of receive buffer (choice). count Number of elements in receive buffer (integer). datatype Datatype of each receive buffer element (handle). source Rank of source (integer). tag Message tag (integer). comm Communicator (handle).
OUTPUT PARAMETERSrequest Communication request (handle). IERROR Fortran only: Error status (integer).
DESCRIPTIONNonblocking calls allocate a communication request object and associate it with the request handle (the argument request). The request can be used later to query the status of the communication or wait for its completion. A nonblocking receive call indicates that the system may start writing data into the receive buffer. The receiver should not access any part of the receive buffer after a nonblocking receive operation is called, until the receive completes. A receive request can be determined being completed by calling the MPI_Wait, MPI_Waitany, MPI_Test, or MPI_Testany with request returned by this function.
ERRORSAlmost 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_Comm_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 ALSOMPI_Recv MPI_Probe MPI_Test MPI_Testany MPI_Wait MPI_Waitany
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