LITMUS: add framework for carrying out jobs after dropping rq locks

Many things can't be done from within the scheduler.
This framework should make it easer to defer them.

1 files changed, 26 insertions, 0 deletions

diff --git a/include/litmus/norqlock.h b/include/litmus/norqlock.h
new file mode 100644
index 0000000000..e4c1d06f51
--- /dev/null
+++ b/include/litmus/norqlock.h
@@ -0,0 +1,26 @@
+#ifndef NORQLOCK_H
+#define NORQLOCK_H
+
+typedef void (*work_t)(unsigned long arg);
+
+struct no_rqlock_work {
+        int                     active;
+        work_t                  work;
+        unsigned long           arg;
+        struct no_rqlock_work*  next;
+};
+
+void init_no_rqlock_work(struct no_rqlock_work* w, work_t work,
+                         unsigned long arg);
+
+void __do_without_rqlock(struct no_rqlock_work *work);
+
+static inline void do_without_rqlock(struct no_rqlock_work *work)
+{
+        if (!test_and_set_bit(0, (void*)&work->active))
+                __do_without_rqlock(work);
+}
+
+void tick_no_rqlock(void);
+
+#endif