source: doc/papers/concurrency/examples/Fib.cfa @ aa22c60

arm-ehcleanup-dtorsenumforall-pointer-decayjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-expr
Last change on this file since aa22c60 was 2e041e27, checked in by Peter A. Buhr <pabuhr@…>, 3 years ago

add examples directory for testing code in the paper

  • Property mode set to 100644
File size: 1.6 KB
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1#include <thread.hfa>
2#include <fstream.hfa>
3
4int fn1, fn2, state = 1;
5int fib_gvar() {
6        int fn;
7        choose ( state ) {
8          case 1: fn = 0;  fn1 = fn;  state = 2;
9          case 2: fn = 1;  fn2 = fn1;  fn1 = fn;  state = 3;
10          case 3: fn = fn1 + fn2;  fn2 = fn1;  fn1 = fn;
11        }
12        return fn;
13}
14
15#define FIB_INIT { 0, 1 }
16typedef struct { int fn1, fn2; } Fib;
17int fib_state( Fib & f ) with( f ) {
18        int ret = fn2;
19        int fn = fn1 + fn2;
20        fn2 = fn1; fn1 = fn;
21        return ret;
22}
23
24coroutine Fib1 { int fn; };                                             // used for communication
25void main( Fib1 & fib ) with( fib ) {                   // called on first resume
26        fn = 0;  int fn1 = fn; suspend();
27        fn = 1;  int fn2 = fn1;  fn1 = fn; suspend();
28        for () {
29                fn = fn1 + fn2;  fn2 = fn1;  fn1 = fn; suspend();
30        }
31}
32int next( Fib1 & fib ) with( fib ) { resume( fib ); return fn; }
33
34coroutine Fib2 { int ret; };                                    // used for communication
35void main( Fib2 & fib ) with( fib ) {                   // called on first resume
36        int fn, fn1 = 1, fn2 = 0;                                       // precompute first two states
37        for () {
38                ret = fn2;
39                fn = fn1 + fn2;  fn2 = fn1;  fn1 = fn;  // general case
40                suspend();                                                              // restart last resume
41        }
42}
43int next( Fib2 & fib ) with( fib ) {
44        resume( fib );                                                          // restart last suspend
45        return ret;
46}
47
48int main() {
49        for ( 10 )
50                sout | fib_gvar();
51        sout | nl;
52
53        Fib f1 = FIB_INIT, f2 = FIB_INIT;
54        for ( 10 )
55                sout | fib_state( f1 ) | fib_state( f2 );
56        sout | nl;
57
58        Fib1 f1, f2;
59        for ( 10 )
60                sout | next( f1 ) | next( f2 );
61        sout | nl;
62
63        Fib2 f1, f2;
64        for ( 10 )
65                sout | next( (Fib2 &)f1 ) | next( (Fib2 &)f2 );
66}
67
68// Local Variables: //
69// tab-width: 4 //
70// fill-column: 120 //
71// compile-command: "cfa Fib.cfa" //
72// End: //
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