source: src/tests/coroutine/fibonacci.c@ 2248dc7

//
// Cforall Version 1.0.0 Copyright (C) 2017 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// fibonacci.c -- 3-state finite-state machine

//
// Author           : Thierry Delisle
// Created On       : Thu Jun  8 07:29:37 2017
// Last Modified By : Peter A. Buhr
// Last Modified On : Fri Apr 27 08:55:31 2018
// Update Count     : 19
//

#include <fstream>
#include <coroutine>

coroutine Fibonacci { int fn; };                                                // used for communication

void main( Fibonacci & fib ) with( fib ) {                              // called on first resume
        int fn1, fn2;                                                                           // retained between resumes
        fn = 0;  fn1 = fn;                                                                      // 1st case
        suspend();                                                                                      // restart last resume
        fn = 1;  fn2 = fn1;  fn1 = fn;                                          // 2nd case
        suspend();                                                                                      // restart last resume
        for ( ;; ) {
                fn = fn1 + fn2;  fn2 = fn1;  fn1 = fn;                  // general case
                suspend();                                                                              // restart last resume
        } // for
}

int next( Fibonacci & fib ) with( fib ) {
        resume( fib );                                                                          // restart last suspend
        return fn;
}

int main() {
        Fibonacci f1, f2;
        for ( int i = 1; i <= 10; i += 1 ) {
                sout | next( f1 ) | next( f2 ) | endl;
        } // for
}

// Local Variables: //
// tab-width: 4 //
// compile-command: "cfa fibonacci.c" //
// End: //