OpenMP is for parallelisation, not concurrency. OpenMP is designed for embarrassingly parallel loops that you typically encounter in numeric code, where parallelization is as simple as tagging a for loop with a pragma and (if necessary) marking variables that should be synchronized and/or critical sections.

E.g. you can make the libsvm library parellalized and scale up to many cores by adding two pragma statements.

I have a Go package that attempts to bring some of this functionality to Go [1]. But it's definitely not the same as having OpenMP.

[1] http://godoc.org/github.com/danieldk/par