[tomcat] branch 9.0.x updated: Sync keepalive

[remm]

This is an automated email from the ASF dual-hosted git repository.

remm 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 0b58157b0c Sync keepalive
0b58157b0c is described below

commit 0b58157b0cc94a38d22ada4d479235163c319f4a
Author: remm <r...@apache.org>
AuthorDate: Wed Sep 27 10:26:16 2023 +0200

    Sync keepalive
    
    The call seems risky with unsynced accesses to maps and the sender.
    Found by coverity.
---
 java/org/apache/catalina/tribes/transport/nio/ParallelNioSender.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git 
a/java/org/apache/catalina/tribes/transport/nio/ParallelNioSender.java 
b/java/org/apache/catalina/tribes/transport/nio/ParallelNioSender.java
index c212f3faa7..a47404ce8d 100644
--- a/java/org/apache/catalina/tribes/transport/nio/ParallelNioSender.java
+++ b/java/org/apache/catalina/tribes/transport/nio/ParallelNioSender.java
@@ -381,7 +381,7 @@ public class ParallelNioSender extends AbstractSender 
implements MultiPointSende
     }
 
     @Override
-    public boolean keepalive() {
+    public synchronized boolean keepalive() {
         boolean result = false;
         for (Iterator<Entry<Member,NioSender>> i = 
nioSenders.entrySet().iterator(); i.hasNext();) {
             Map.Entry<Member, NioSender> entry = i.next();


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