kern/sleepq: new module

This module provides simple generic sleep queues that can be used to
implement higher level synchronization facilities such as mutexes and
condition variables.

1 files changed, 8 insertions, 0 deletions

diff --git a/kern/thread_i.h b/kern/thread_i.h
index a062773d..af278b26 100644
--- a/kern/thread_i.h
+++ b/kern/thread_i.h
@@ -27,6 +27,11 @@
 #include <machine/atomic.h>
 #include <machine/tcb.h>
 
+/*
+ * Forward declarations.
+ */
+struct sleepq;
+
 struct thread_runq;
 struct thread_fs_runq;
 
@@ -92,6 +97,9 @@ struct thread {
     const char *wchan_desc;
     unsigned short state;
 
+    /* Sleep queue available for lending */
+    struct sleepq *priv_sleepq;
+
     /* Thread-local members */
     unsigned short preempt;
     unsigned short pinned;