main.cc

   1 #include "libthreads.h"
   2 #include "common.h"
   3 #include "threads.h"
   4
   5 /* global "model" object */
   6 #include "model.h"
   7
   8 /*
   9  * Return 1 if found next thread, 0 otherwise
  10  */
  11 static int thread_system_next(void)
  12 {
  13         Thread *curr, *next;
  14
  15         curr = thread_current();
  16         if (curr) {
  17                 if (curr->get_state() == THREAD_READY) {
  18                         model->check_current_action();
  19                         model->scheduler->add_thread(curr);
  20                 } else if (curr->get_state() == THREAD_RUNNING)
  21                         /* Stopped while running; i.e., completed */
  22                         curr->complete();
  23                 else
  24                         ASSERT(false);
  25         }
  26         next = model->scheduler->next_thread();
  27         if (next)
  28                 next->set_state(THREAD_RUNNING);
  29         DEBUG("(%d, %d)\n", curr ? curr->get_id() : -1, next ? next->get_id() : -1);
  30         if (!next)
  31                 return 1;
  32         return Thread::swap(model->get_system_context(), next);
  33 }
  34
  35 static void thread_wait_finish(void)
  36 {
  37
  38         DBG();
  39
  40         while (!thread_system_next());
  41 }
  42
  43 /*
  44  * Main system function
  45  */
  46 int main()
  47 {
  48         thrd_t user_thread;
  49         ucontext_t main_context;
  50
  51         model = new ModelChecker();
  52
  53         if (getcontext(&main_context))
  54                 return 1;
  55
  56         model->set_system_context(&main_context);
  57
  58         do {
  59                 /* Start user program */
  60                 model->add_thread(new Thread(&user_thread, &user_main, NULL));
  61
  62                 /* Wait for all threads to complete */
  63                 thread_wait_finish();
  64         } while (model->next_execution());
  65
  66         delete model;
  67
  68         DEBUG("Exiting\n");
  69         return 0;
  70 }