Messages in this thread | | | Date | Tue, 18 Mar 2014 05:52:56 -0700 | From | "Paul E. McKenney" <> | Subject | Re: atomic read and increment question |
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On Tue, Mar 18, 2014 at 01:26:12AM -0700, noman pouigt wrote: > Hello, > > I looked through the documentation for atomic > operations but couldn't find out the api for following > operation: > > x = 1; > temp = atomic_read_increment(x); > > so basically this will read the old value of x in temp > and then increment x. > > so temp = 1 and x = 2. > > Is this api already available?
You want atomic_inc_return(). It returns the new value rather than the old value, but you can do the following:
temp = atomic_inc_return(&x) - 1;
Thanx, Paul
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