schedule: add sleep() function

The wait() and wake() functions are not very complementary. I will be removing
wait() in favor of a simpler sleep() function, which is introduced here.

diff --git a/schedule.cc b/schedule.cc
index be4a92f739a1129bb2aa4bee50bb23ba0a3f8556..9063fdb4680243c6d3a78e686ef29f217ecbf0cd 100644 (file)
--- a/schedule.cc
+++ b/schedule.cc
@@ -45,6 +45,17 @@ void Scheduler::wait(Thread *wait, Thread *join)
        wait->set_state(THREAD_BLOCKED);
 }
 
        wait->set_state(THREAD_BLOCKED);
 }
 

+/**
+ * Prevent a Thread from being scheduled. The sleeping Thread should be
+ * re-awoken via Scheduler::wake.
+ * @param thread The Thread that should sleep
+ */
+void Scheduler::sleep(Thread *t)
+{
+       remove_thread(t);
+       t->set_state(THREAD_BLOCKED);
+}
+

 /**
  * Wake a Thread up that was previously waiting (see Scheduler::wait)
  * @param t The Thread to wake up
 /**
  * Wake a Thread up that was previously waiting (see Scheduler::wait)
  * @param t The Thread to wake up

diff --git a/schedule.h b/schedule.h
index 664b2d245bea0b05a3f072d9c0eb75146bdfaf0f..7875e0b6e24147c5e526b58ace7a580bc53c79c3 100644 (file)
--- a/schedule.h
+++ b/schedule.h
@@ -19,6 +19,7 @@ public:
        void add_thread(Thread *t);
        void remove_thread(Thread *t);
        void wait(Thread *wait, Thread *join);
        void add_thread(Thread *t);
        void remove_thread(Thread *t);
        void wait(Thread *wait, Thread *join);

+       void sleep(Thread *t);

        void wake(Thread *t);
        Thread * next_thread(Thread *t);
        Thread * get_current_thread() const;
        void wake(Thread *t);
        Thread * next_thread(Thread *t);
        Thread * get_current_thread() const;