macro with in a macro

Is it possible to define a macro with in a macro ? Any trick will do.
I am trying to do quick conversion of cuda program to open mp by defining some macros at the top:

Code:

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#define __syncthreads()  #pragma omp barrier

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Thanks

See http://msdn.microsoft.com/en-us/library/d9x1s805.aspx
Also note that you should not start names with an underscore, as these are reserved for the compiler.

Thanks I came up with an inline function solution but yours works too.

Code:

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//inline void l_barrier() {
//        #pragma omp barrier
//}
#define l_barrier() { \
__pragma(omp barrier) \
}

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The __syncthreads with double underscores is defined by the cuda compiler (not from me).