Hi,

I have some web services which call flurry api. To get some data from 
flurry api, I must wait 1 sec before each calls to the api.
There is 6 actions on my web services

   1. getActiveUsers
   2. getSessionsNumberByDay
   3. getNewUsers
   4. getTotalActiveUsers
   5. getTotalSessions
   6. getTotalNewUsers
   
On my web page I made 6 http request and between each request I'm waiting 1 
sec.

If this web page is display twice on the same time, I have a concurrency in 
the first http request.
I want to implement "a semaphore" like on my web services, when a request 
is received and there is no request executed, is executed, if not, the 
request wait to be executed. The 6 actions must use the same semaphore.

How can I implement this on node ?

Thanks

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