On Mon, 7 Nov 2022 17:56:00 GMT, Alan Bateman <[email protected]> wrote:
>> This patch moves the acquisition of the boot class loader lock out of the
>> JVM and into the Java function.
>> Tested with tier1-4, and jvmti and jdi tests locally.
>
> src/java.base/share/classes/jdk/internal/loader/ClassLoaders.java line 204:
>
>> 202: * @see
>> java.lang.instrument.Instrumentation#appendToSystemClassLoaderSearch
>> 203: */
>> 204: synchronized void appendToClassPathForInstrumentation(String
>> path) {
>
> We might not need this. appendClasspath is thread safe so it's okay for
> several agents calling appendToSystemClassLoaderSearch at around the same
> time. I don't think it needs to sycnrhonize with anything else.
I traced it down to this: Is this why it's already synchronized ?
appendClassPath -> ucp.addFile -> addURL
public synchronized void addURL(URL url) {
if (closed || url == null)
return;
synchronized (unopenedUrls) {
if (! path.contains(url)) {
unopenedUrls.addLast(url);
path.add(url);
}
}
}
-------------
PR: https://git.openjdk.org/jdk/pull/11023
