Kernel spinlock support.

1 files changed, 12 insertions, 0 deletions

diff --git a/src/kernel/spinlock.C b/src/kernel/spinlock.C
new file mode 100644
index 000000000..bfada05c4
--- /dev/null
+++ b/src/kernel/spinlock.C
@@ -0,0 +1,12 @@
+#include <kernel/spinlock.H>
+
+void Spinlock::lock()
+{
+    uint64_t reservation = __sync_fetch_and_add(&iv_reserve, 1);
+    while(iv_ready != reservation);
+}
+
+void Spinlock::unlock()
+{
+    __sync_add_and_fetch(&iv_ready, 1);
+}