nginx 0.1.21 *) Bugfix: the ngx_http_stub_status_module showed incorrect statistics if "rtsig" method was used or if several worker process ran on SMP. *) Bugfix: nginx could not be built by the icc compiler on Linux or if the zlib-1.2.x library was building from sources. *) Bugfix: nginx could not be built on NetBSD 2.0.

--- a/src/core/ngx_spinlock.c
+++ b/src/core/ngx_spinlock.c
@@ -8,6 +8,10 @@
 #include <ngx_core.h>
 
 
+/*
+ * TODO: the P4 optimized assembler version with the "pause" operation
+ */
+
 void ngx_spinlock(ngx_atomic_t *lock, ngx_uint_t spin)
 {