From 5b91cbdca17042f019c3fc35c61ac94d3654005b Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Mon, 26 Mar 2018 18:47:29 -0700
Subject: [PATCH] ircd::ctx: Add share counter observer to shared_mutex.

---
 include/ircd/ctx/shared_mutex.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/ircd/ctx/shared_mutex.h b/include/ircd/ctx/shared_mutex.h
index f9808534b..02c5cfe31 100644
--- a/include/ircd/ctx/shared_mutex.h
+++ b/include/ircd/ctx/shared_mutex.h
@@ -25,6 +25,7 @@ class ircd::ctx::shared_mutex
 	void release();
 
   public:
+	size_t shares() const;
 	size_t waiting() const;
 
 	bool try_lock();
@@ -360,6 +361,13 @@ const
 	return q.size();
 }
 
+inline size_t
+ircd::ctx::shared_mutex::shares()
+const
+{
+	return std::max(s, ssize_t(0));
+}
+
 inline void
 ircd::ctx::shared_mutex::release()
 {