fork(1) download 
  1. #include <stdio.h>
  2.  
  3.  
  4. #define BEGIN switch (ctx->state) { \
  5.                         case 0:
  6.  
  7. #define YIELD(val) do { \
  8.                         ctx->state = __LINE__;   \
  9.                         return val;         \
  10.                         case __LINE__:        \
  11.                         ;                   \
  12.                         } while (0)
  13.  
  14. #define END }
  15.  
  16. typedef struct{
  17.     int state;	
  18.     int i;
  19. }  Ctx;
  20.  
  21. int fibs(Ctx* ctx)
  22. {
  23.     int x;
  24.     BEGIN;
  25.         YIELD(++ctx->i);
  26.         YIELD(++ctx->i);
  27.  
  28.     END;
  29.     return 0;
  30. } 
  31.  
  32. int main()
  33. {
  34.     int i=0;
  35.  
  36.     Ctx t0 = {0,1};
  37.     Ctx t1 = {0,101};    
  38.     while (i = fibs(&t0)) {
  39.         printf("t0:%d\n", i);
  40.         printf("t1:%d\n", fibs(&t1));
  41.     } 
  42.  
  43.     return 0;
  44. }
Success #stdin #stdout 0s 5428KB
comments (?)
stdin 
Standard input is empty
stdout 
t0:2
t1:102
t0:3
t1:103
https://ideone.com/4ZZUYA
language:
C (gcc 8.3)
created:
2 years ago
visibility:
secret

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