100% CPU usage during wait #7

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1. raypulver commented on Dec 16, 2014

   

   raypulver

   on Dec 16, 2014

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   I took out the loop and replaced it with

   waitpid(child, &status, 0);

   This seems to work. WNOHANG makes it so the call is non-blocking. If you pass no flags to waitpid instead, it blocks without need for the do while loop. I wonder why WNOHANG was passed in though?
2. raypulver commented on Jan 1, 2015

   

   raypulver

   on Jan 1, 2015

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   I had problems with my original solution, finding out that you definitely have to loop over waitpid to use it correctly. I eventually ended up using the loop

   while (waitpid(child, &status, 0) == - 1) {
     if (errno != EINTR) {
       perror("waitpid");
       exit(1);
     }
   }
   

   This seems to work perfectly, without the 100% CPU problem.