https://issues.apache.org/bugzilla/show_bug.cgi?id=49686
Summary: Using an instance lock to protect static shared data
in class SocketConnector
Product: Tomcat 7
Version: 7.0.0
Platform: PC
OS/Version: Windows XP
Status: NEW
Severity: normal
Priority: P2
Component: Modules: tomcat-lite
AssignedTo: [email protected]
ReportedBy: [email protected]
SocketConnector has the unsafe synchronization as follow.
public class SocketConnector extends IOConnector {
...
static int id = 0;
public synchronized NioThread getSelector() {
if (selector == null) {
String name = "SelectorThread-" + id++;
selector = new NioThread(name, true);
}
return selector;
}
...
}
id is a static shared data, and it is not proper to use a instance lock to
protect it, especially when two instance of the class are created.
it would be more safer to write this instead:
public static synchronized NioThread getSelector() {
if (selector == null) {
String name = "SelectorThread-" + id++;
selector = new NioThread(name, true);
}
return selector;
}
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