How to write a master-subproblem iterative algorithm asynchronously?

General Usage
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18

Absolutely. But, the local will be inserted where the macro is used, so it may end up as a local. However, variables created in macros are “sanitized” anyway, that is, made into unique names which can’t be reached by accident. This is done by making variable names which are syntactically incorrect, with var"##something". That is, var"#536#temp" is just a variable name. All of the user’s variables must be enclosed in esc, otherwise they’re prefixed with the module name in which the macro is defined.

 julia> macro acquire(s, expr)
               quote
                   temp = $(esc(s))
                   Base.acquire(temp)
                   try
                       $(esc(expr))
                   finally
                       Base.release(temp)
                   end
               end
           end
@acquire (macro with 1 method)

julia> @macroexpand @acquire a b
quote
    var"#536#temp" = a
    (Main.Base).acquire(var"#536#temp")
    try
        b
    finally
        (Main.Base).release(var"#536#temp")
    end
end

This works also for your own variables:

julia> a = 2
2

julia> var"#b" = 3
3

julia> var"a"
2

julia> var"#b" + a
5
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