add new test for priority donation with conditions

1 files changed, 97 insertions, 0 deletions

diff --git a/tests/threads/priority-donate-condvar.c b/tests/threads/priority-donate-condvar.c
new file mode 100644
index 0000000..321a58a
--- /dev/null
+++ b/tests/threads/priority-donate-condvar.c
@@ -0,0 +1,97 @@
+/* Basically that's the same test as priority-donate-sema but using
+   conditions instead of semaphores.
+
+   Low priority thread L acquires a lock, then blocks waiting for
+   the condition.  Medium priority thread M then blocks waiting for
+   the same condition.  Next, high priority thread H attempts to
+   acquire the lock, donating its priority to L.
+
+   Next, the main thread signals the condition, waking up L.  L
+   releases the lock, which wakes up H.  H signals the condition,
+   waking up M.  H terminates, then M, then L, and finally the
+   main thread.
+
+   Written by Manuel Mausz <manuel-tuwien@mausz.at>. */
+
+#include <stdio.h>
+#include "tests/threads/tests.h"
+#include "threads/init.h"
+#include "threads/synch.h"
+#include "threads/thread.h"
+
+struct lock_and_cond
+  {
+    struct lock lock;
+    struct lock lockc;
+    struct condition cond;
+  };
+
+static thread_func l_thread_func;
+static thread_func m_thread_func;
+static thread_func h_thread_func;
+
+void
+test_priority_donate_condvar (void)
+{
+  struct lock_and_cond ls;
+
+  /* This test does not work with the MLFQS. */
+  ASSERT (!thread_mlfqs);
+
+  /* Make sure our priority is the default. */
+  ASSERT (thread_get_priority () == PRI_DEFAULT);
+
+  lock_init (&ls.lock);
+  lock_init (&ls.lockc);
+  cond_init (&ls.cond);
+  thread_create ("low", PRI_DEFAULT + 1, l_thread_func, &ls);
+  thread_create ("med", PRI_DEFAULT + 3, m_thread_func, &ls);
+  thread_create ("high", PRI_DEFAULT + 5, h_thread_func, &ls);
+  lock_acquire (&ls.lockc);
+  msg ("Signaling...");
+  cond_signal (&ls.cond, &ls.lockc);
+  lock_release (&ls.lockc);
+  msg ("Main thread finished.");
+}
+
+static void
+l_thread_func (void *ls_)
+{
+  struct lock_and_cond *ls = ls_;
+
+  lock_acquire (&ls->lock);
+  msg ("Thread L acquired lock.");
+  lock_acquire (&ls->lockc);
+  cond_wait (&ls->cond, &ls->lockc);
+  lock_release (&ls->lockc);
+  msg ("Thread L woke up.");
+  lock_release (&ls->lock);
+  msg ("Thread L finished.");
+}
+
+static void
+m_thread_func (void *ls_)
+{
+  struct lock_and_cond *ls = ls_;
+
+  lock_acquire (&ls->lockc);
+  cond_wait (&ls->cond, &ls->lockc);
+  lock_release (&ls->lockc);
+  msg ("Thread M finished.");
+}
+
+static void
+h_thread_func (void *ls_)
+{
+  struct lock_and_cond *ls = ls_;
+
+  lock_acquire (&ls->lock);
+  msg ("Thread H acquired lock.");
+
+  lock_acquire (&ls->lockc);
+  msg ("Signaling...");
+  cond_signal (&ls->cond, &ls->lockc);
+  lock_release (&ls->lockc);
+  lock_release (&ls->lock);
+  msg ("Thread H finished.");
+}