Make sure SQL server agent job is not running before executing the same job TSQL

I would like to know the most efficient way to check if a SQL server agent job is running before executing the same job.  Ideally if the job was running the logic would be such that it continues to check the job until completed and then executes the same job again.  Please advise.
Gary HarperAsked:
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Aneesh RetnakaranDatabase AdministratorCommented:
SELECT  job.name ,
        job.job_id ,
        activity.run_requested_date
FROM    msdb.dbo.sysjobs_view job
INNER JOIN msdb.dbo.sysjobactivity activity ON  job.job_id=activity.job_id
WHERE   run_requested_date IS NOT NULL
        AND stop_execution_date IS NULL
        AND job.name LIKE 'Your Job Name%';
Gary HarperAuthor Commented:
So if the job was running the run_requested_date would be NULL?  If that was the case how would I continuously check that job until the status had changed and then execute the job?  Would there be some sort of loop necessary?
Aneesh RetnakaranDatabase AdministratorCommented:
If the job is running, the above query will return a record.
I don't really understand what you are looking exactly; but in order for you to check it on a continuous basis, you can use the WAITFOR  DELAY statement  (https://msdn.microsoft.com/en-us/library/ms187331.aspx)

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Microsoft SQL Server

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