mutex and semaphore like in shell script

#proc1.sh #!/bin/sh touch /tmp/proc1.signature.mutex #do something for long time sleep 100 rm -rf /tmp/proc1.signature.mutex #proc2.sh #!/bin/sh touch /tmp/proc2.signature.mutex #do something for long time sleep 100 rm -rf /tmp/proc2.signature.mutex #proc3.sh #!/bin/sh touch /tmp/proc3.signature.mutex #do something for long time sleep 100 rm -rf /tmp/proc3.signature.mutex #core.sh Now is there a way to wait for deleting /tmp/proc[?][*].signature.mutex all such file using loop or something and then continue further execution How to achieve objective of core.sh