From: Kefu Chai <kchai@redhat.com>
Date: Sun, 7 Jul 2019 03:21:12 +0000 (+0800)
Subject: common/RWLock: add RWLock::{lock,unlock}_shared()
X-Git-Tag: v15.1.0~1971^2~47
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=3f612c45e30592f1ca9a8fbe77c03efd8fd181c3;p=ceph.git

common/RWLock: add RWLock::{lock,unlock}_shared()

so RWLock can be used with std::shared_lock,

rgw is using RWLock'prioritize_write feature, which is not offered by
std::shared_mutex, but we want to unify the way we use mutex, so add
these helper functions.

Signed-off-by: Kefu Chai <kchai@redhat.com>
---

diff --git a/src/common/RWLock.h b/src/common/RWLock.h
index 94ba7a001164..08c8edc7b6d5 100644
--- a/src/common/RWLock.h
+++ b/src/common/RWLock.h
@@ -122,7 +122,12 @@ public:
   void put_read() const {
     unlock();
   }
-
+  void lock_shared() {
+    get_read();
+  }
+  void unlock_shared() {
+    put_read();
+  }
   // write
   void get_write(bool lockdep=true) {
     if (lockdep && this->lockdep && g_lockdep)
@@ -148,7 +153,9 @@ public:
   void put_write() {
     unlock();
   }
-
+  void lock() {
+    get_write();
+  }
   void get(bool for_write) {
     if (for_write) {
       get_write();