main.cc

   1 #include <stdlib.h>
   2
   3 #include "libthreads.h"
   4 #include "schedule.h"
   5 #include "common.h"
   6 #include "threads.h"
   7
   8 /* global "model" object */
   9 #include "model.h"
  10
  11 /*
  12  * Return 1 if found next thread, 0 otherwise
  13  */
  14 static int thread_system_next(void)
  15 {
  16         Thread *curr, *next;
  17
  18         curr = thread_current();
  19         if (curr) {
  20                 if (curr->get_state() == THREAD_READY) {
  21                         model->check_current_action();
  22                         model->scheduler->add_thread(curr);
  23                 } else if (curr->get_state() == THREAD_RUNNING)
  24                         /* Stopped while running; i.e., completed */
  25                         curr->complete();
  26                 else
  27                         ASSERT(false);
  28         }
  29         next = model->scheduler->next_thread();
  30         if (next)
  31                 next->set_state(THREAD_RUNNING);
  32         DEBUG("(%d, %d)\n", curr ? curr->get_id() : -1, next ? next->get_id() : -1);
  33         if (!next)
  34                 return 1;
  35         return Thread::swap(model->get_system_context(), next);
  36 }
  37
  38 static void thread_wait_finish(void)
  39 {
  40
  41         DBG();
  42
  43         while (!thread_system_next());
  44 }
  45
  46 /*
  47  * Main system function
  48  */
  49 int main()
  50 {
  51         thrd_t user_thread;
  52         ucontext_t main_context;
  53
  54         model = new ModelChecker();
  55
  56         if (getcontext(&main_context))
  57                 return 1;
  58
  59         model->set_system_context(&main_context);
  60
  61         do {
  62                 /* Start user program */
  63                 model->add_thread(new Thread(&user_thread, &user_main, NULL));
  64
  65                 /* Wait for all threads to complete */
  66                 thread_wait_finish();
  67         } while (model->next_execution());
  68
  69         delete model;
  70
  71         DEBUG("Exiting\n");
  72         return 0;
  73 }