isready
isready(r::RemoteRef)
Determine whether a RemoteRef has a value stored to it. Note that this function can cause race conditions, since by the time you receive its result it may no longer be true. It is recommended that this function only be used on a RemoteRef that is assigned once.
If the argument RemoteRef is owned by a different node, this call will block to wait for the answer. It is recommended to wait for r in a separate task instead, or to use a local RemoteRef as a proxy:
rr = RemoteRef()
@async put!(rr, remotecall_fetch(long_computation, p))
isready(rr) # will not blockExamples
julia> r = RemoteRef()
RemoteRef{Channel{Any}}(1, 1, 2)
julia> isready(r)
falseIn this example, the isready function is used to check if a RemoteRef has a value stored to it. Initially, the RemoteRef r does not have a value stored, so isready(r) returns false.
julia> rr = RemoteRef(p, Channel{Any}(true))
julia> isready(rr)
trueThis example demonstrates that if the RemoteRef has a value stored, the isready function returns true.
Note that using isready can cause race conditions since the result may not be accurate by the time it is received. It is recommended to use isready on a RemoteRef that is assigned once. If the RemoteRef is owned by a different node, the call to isready will block to wait for the answer. It is better to wait for the RemoteRef in a separate task or use a local RemoteRef as a proxy to avoid blocking.
See Also
accept, bind, :@spawn, connect, fetch, getaddrinfo, gethostname, getipaddr, getsockname, init_worker, IPv4, IPv6, isready, issocket, kill, listen, recv, recvfrom, remotecall, remotecall_fetch, remotecall_wait, RemoteRef, send, setopt,User Contributed Notes
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