text: //mudou estrutura do fork pra garantir o inteiro correspondente aos tickets
  // Demonstrate that moving the "acquire" in iderw after the loop that
  // appends to the idequeue results in a race.
  
  // For this to work, you should also add a spin within iderw's
  // idequeue traversal loop.  Adding the following demonstrated a panic
  // after about 5 runs of stressfs in QEMU on a 2.1GHz CPU:
  //    for (i = 0; i < 40000; i++)
  //      asm volatile("");
  
  #include "types.h"
  #include "stat.h"
  #include "user.h"
  #include "fs.h"
  #include "fcntl.h"
  
  int
  main(int argc, char *argv[])
  {
    int fd, i;
    char path[] = "stressfs0";
    char data[512];
  
    printf(1, "stressfs starting\n");
    memset(data, 'a', sizeof(data));
  
    for(i = 0; i < 4; i++)
      if(fork(0) > 0)
        break;
  
    printf(1, "write %d\n", i);
  
    path[8] += i;
    fd = open(path, O_CREATE | O_RDWR);
    for(i = 0; i < 20; i++)
  //    printf(fd, "%d\n", i);
      write(fd, data, sizeof(data));
    close(fd);
  
    printf(1, "read\n");
  
    fd = open(path, O_RDONLY);
    for (i = 0; i < 20; i++)
      read(fd, data, sizeof(data));
    close(fd);
  
    wait();
    
    exit();
  }
  