/*D
   MPI_Iallgather - Gathers data from all tasks and distribute the combined data to all tasks in a nonblocking way

Synopsis:
.vb
int MPI_Iallgather(const void *sendbuf, int sendcount, MPI_Datatype sendtype,
                   void *recvbuf, int recvcount, MPI_Datatype recvtype,
                   MPI_Comm comm, MPI_Request *request)
.ve
.vb
int MPI_Iallgather_c(const void *sendbuf, MPI_Count sendcount,
                     MPI_Datatype sendtype, void *recvbuf, MPI_Count recvcount,
                     MPI_Datatype recvtype, MPI_Comm comm,
                     MPI_Request *request)
.ve

Input Parameters:
+ sendbuf - starting address of send buffer (choice)
. sendcount - number of elements in send buffer (non-negative integer)
. sendtype - data type of send buffer elements (handle)
. recvcount - number of elements received from any process (non-negative integer)
. recvtype - data type of receive buffer elements (handle)
- comm - communicator (handle)

Output Parameters:
+ recvbuf - address of receive buffer (choice)
- request - communication request (handle)

.N ThreadSafe

.N Fortran

.N Errors
.N MPI_SUCCESS
.N MPI_ERR_ARG
.N MPI_ERR_BUFFER
.N MPI_ERR_COMM
.N MPI_ERR_COUNT
.N MPI_ERR_TYPE
.N MPI_ERR_OTHER

D*/

