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Add and use Mprobe, Mrecv, Improbe, Imrecv #307

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Add and use Mprobe, Mrecv, Improbe, Imrecv #307

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3 changes: 3 additions & 0 deletions deps/gen_consts.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -78,6 +78,9 @@ MPI_handle = [
:MPI_Request => [
:MPI_REQUEST_NULL,
],
:MPI_Message => [
:MPI_MESSAGE_NULL,
],
:MPI_Op => MPI_op_consts,
:MPI_Datatype => MPI_datatype_consts
]
Expand Down
60 changes: 55 additions & 5 deletions src/pointtopoint.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -55,8 +55,12 @@ Get_error(status::Status) = Int(status.error)

@mpi_handle Request buffer

@mpi_handle Message

const REQUEST_NULL = _Request(MPI_REQUEST_NULL, nothing)
Request() = Request(REQUEST_NULL.val, nothing)
const MESSAGE_NULL = _Message(MPI_MESSAGE_NULL)
Message() = Message(MESSAGE_NULL.val)

function Probe(src::Integer, tag::Integer, comm::Comm)
stat_ref = Ref{Status}()
Expand All @@ -78,6 +82,34 @@ function Iprobe(src::Integer, tag::Integer, comm::Comm)
true, stat_ref[]
end

function Improbe(src::Integer, tag::Integer, comm::Comm)
flag = Ref{Cint}()
stat_ref = Ref{Status}()
message = Message()
@mpichk ccall((:MPI_Improbe, libmpi), Cint,
(Cint, Cint, MPI_Comm, Ptr{Cint}, Ptr{MPI_Message}, Ptr{Status}),
src, tag, comm, flag, message, stat_ref)
if flag[] == 0
return false, nothing, nothing
end
true, message, stat_ref[]
end

"""
Mprobe(src::Integer, tag::Integer, comm::Comm) where T

Blocking matched probe for a message on communicator `comm` using the message
tag `tag`
"""
function Mprobe(src::Integer, tag::Integer, comm::Comm)
stat_ref = Ref{Status}()
message = Message()
@mpichk ccall((:MPI_Mprobe, libmpi), Cint,
(Cint, Cint, MPI_Comm, Ptr{MPI_Message}, Ptr{Status}),
src, tag, comm, message, stat_ref)
message, stat_ref[]
end

function Get_count(stat::Status, ::Type{T}) where T
count = Ref{Cint}()
@mpichk ccall((:MPI_Get_count, libmpi), Cint,
Expand Down Expand Up @@ -275,13 +307,31 @@ function Recv(::Type{T}, src::Integer, tag::Integer, comm::Comm) where T
end

function recv(src::Integer, tag::Integer, comm::Comm)
stat = Probe(src, tag, comm)
mess, stat = Mprobe(src, tag, comm)
count = Get_count(stat, UInt8)
buf = Array{UInt8}(undef, count)
stat = Recv!(buf, Get_source(stat), Get_tag(stat), comm)
stat = Mrecv!(buf, mess)
(MPI.deserialize(buf), stat)
end

"""
Mrecv!(buf::MPIBuffertype{T}, message::Message) where T

Starts a blocking receive of a message specified by `message`, obtained by
Mprobe.

Returns the communication `Request` for the nonblocking receive.
"""
function Mrecv!(buf::MPIBuffertype{T}, message::Message) where T
stat_ref = Ref{Status}()
# int MPI_Irecv(void* buf, int count, MPI_Datatype datatype, int source,
# int tag, MPI_Comm comm, MPI_Request *request)
@mpichk ccall((:MPI_Mrecv, libmpi), Cint,
(Ptr{T}, Cint, MPI_Datatype, Ptr{MPI_Message}, Ptr{Status}),
buf, length(buf), mpitype(T), message, stat_ref)
stat_ref[]
end

"""
Irecv!(buf::MPIBuffertype{T}, count::Integer, datatype::Datatype,
src::Integer, tag::Integer, comm::Comm) where T
Expand Down Expand Up @@ -313,7 +363,7 @@ from MPI rank `src` of communicator `comm` using with the message tag `tag`
Returns the communication `Request` for the nonblocking receive.
"""
function Irecv!(buf, count::Integer,
src::Integer, tag::Integer, comm::Comm)
src::Integer, tag::Integer, comm::Comm)
Irecv!(buf, count, mpitype(eltype(buf)), src, tag, comm)
end

Expand All @@ -331,13 +381,13 @@ function Irecv!(buf::AbstractArray{T}, src::Integer, tag::Integer,
end

function irecv(src::Integer, tag::Integer, comm::Comm)
(flag, stat) = Iprobe(src, tag, comm)
(flag, mess, stat) = Improbe(src, tag, comm)
if !flag
return (false, nothing, nothing)
end
count = Get_count(stat, UInt8)
buf = Array{UInt8}(undef, count)
stat = Recv!(buf, Get_source(stat), Get_tag(stat), comm)
stat = MRecv!(buf, mess)
(true, MPI.deserialize(buf), stat)
end

Expand Down