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markt-asf pushed a commit to branch 9.0.x
in repository https://gitbox.apache.org/repos/asf/tomcat.git


The following commit(s) were added to refs/heads/9.0.x by this push:
     new 7a5945f1de Reduce CPU usage while sending WebSocket close message
7a5945f1de is described below

commit 7a5945f1de1d3310214234dfbbd7c569af52d058
Author: Mark Thomas <[email protected]>
AuthorDate: Fri Aug 21 13:45:25 2026 +0100

    Reduce CPU usage while sending WebSocket close message
---
 .../org/apache/tomcat/websocket/server/WsRemoteEndpointImplServer.java | 2 +-
 webapps/docs/changelog.xml                                             | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git 
a/java/org/apache/tomcat/websocket/server/WsRemoteEndpointImplServer.java 
b/java/org/apache/tomcat/websocket/server/WsRemoteEndpointImplServer.java
index f834650f7a..fe9ede384c 100644
--- a/java/org/apache/tomcat/websocket/server/WsRemoteEndpointImplServer.java
+++ b/java/org/apache/tomcat/websocket/server/WsRemoteEndpointImplServer.java
@@ -139,7 +139,7 @@ public class WsRemoteEndpointImplServer extends 
WsRemoteEndpointImplBase {
                             socketWrapper.getLock().unlock();
                         }
                         // Provide opportunity for another thread to obtain 
the socketWrapper lock
-                        Thread.yield();
+                        Thread.sleep(50);
                     } finally {
                         // Re-obtain the per socket lock(s)
                         for (int i = 0; i < socketWrapperLockCount; i++) {
diff --git a/webapps/docs/changelog.xml b/webapps/docs/changelog.xml
index 3ab247ac0a..5f6e4a4fa8 100644
--- a/webapps/docs/changelog.xml
+++ b/webapps/docs/changelog.xml
@@ -284,6 +284,9 @@
         Ensure that WebSocket write timeouts apply to the complete message and
         are not lost if two writes have the same timeout. (markt)
       </fix>
+      <fix>
+        Reduce CPU usage while sending WebSocket close message. (markt)
+      </fix>
     </changelog>
   </subsection>
   <subsection name="Web applications">


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