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  1. #include <sys/types.h>
  2. #include <sys/wait.h>
  3. #include <stdio.h>
  4. #include <unistd.h>
  5.  
  6. int main() {
  7.     int value = 10;
  8.     pid_t pid;
  9.  
  10.     pid = fork();
  11.  
  12.     if (pid > 0) {
  13.         value += 10;
  14.         waitpid(-1, NULL, 0);
  15.         printf("%d: val = %d\n", getpid(), value);
  16.     }
  17.  
  18.     pid = fork();
  19.     if (pid == 0) {
  20.         pid = fork();
  21.         if (pid > 0) {
  22.             value += 15;
  23.             printf("%d: val = %d\n", getpid(), value);
  24.         }
  25.         else if (pid == 0) {
  26.             value /= 4;
  27.             printf("%d: val = %d\n", getpid(), value);
  28.         }
  29.     }    
  30.     else {
  31.         value -= 10;
  32.     }
  33.  
  34.     waitpid(-1, NULL, 0);
  35.     printf("%d: val = %d\n", getpid(), value);
  36.  
  37.     return 0;
  38. }
  39.  
Success #stdin #stdout 0.01s 5308KB
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stdin
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Standard input is empty
stdout
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1313760: val = 2
1313760: val = 2
1313759: val = 25
1313759: val = 25
1313758: val = 0
1313755: val = 20
1313762: val = 5
1313762: val = 5
1313755: val = 20
1313761: val = 35
1313761: val = 35
1313755: val = 20
1313755: val = 10
https://ideone.com/D7KEh5
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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