We have two pipelines, which use a shared resource on one of the Stages. Let's say Pipeline1 uses resource X on stage "Testing" and Pipeline2 uses resource X on stage "Testing".
Each pipeline runs as a separate job. Would it be somehow possible to instruct Pipeline1 to wait before entering stage "Testing", if Pipeline2 is already running on "Testing"? Smth like:

//just as an assumption
wait_if("Pipeline2").is_on_stage("Testing") //in a Jenkinsfile of Pipeline1

I think some @NonCPS workaround is possible (based on pipeline global lbrary), but would be probably nice to have it out of the box.