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8284161: Implementation of Virtual Threads (Preview)
Co-authored-by: Ron Pressler <rpressler@openjdk.org> Co-authored-by: Alan Bateman <alanb@openjdk.org> Co-authored-by: Erik Österlund <eosterlund@openjdk.org> Co-authored-by: Andrew Haley <aph@openjdk.org> Co-authored-by: Rickard Bäckman <rbackman@openjdk.org> Co-authored-by: Markus Grönlund <mgronlun@openjdk.org> Co-authored-by: Leonid Mesnik <lmesnik@openjdk.org> Co-authored-by: Serguei Spitsyn <sspitsyn@openjdk.org> Co-authored-by: Chris Plummer <cjplummer@openjdk.org> Co-authored-by: Coleen Phillimore <coleenp@openjdk.org> Co-authored-by: Robbin Ehn <rehn@openjdk.org> Co-authored-by: Stefan Karlsson <stefank@openjdk.org> Co-authored-by: Thomas Schatzl <tschatzl@openjdk.org> Co-authored-by: Sergey Kuksenko <skuksenko@openjdk.org> Reviewed-by: lancea, eosterlund, rehn, sspitsyn, stefank, tschatzl, dfuchs, lmesnik, dcubed, kevinw, amenkov, dlong, mchung, psandoz, bpb, coleenp, smarks, egahlin, mseledtsov, coffeys, darcy
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parent
5212535a27
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1133 changed files with 95935 additions and 8335 deletions
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@ -45,6 +45,7 @@ import java.util.ServiceLoader;
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import jdk.internal.access.JavaNetURLAccess;
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import jdk.internal.access.SharedSecrets;
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import jdk.internal.misc.ThreadTracker;
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import jdk.internal.misc.VM;
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import sun.net.util.IPAddressUtil;
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import sun.security.util.SecurityConstants;
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@ -1342,15 +1343,24 @@ public final class URL implements java.io.Serializable {
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};
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}
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// Thread-local gate to prevent recursive provider lookups
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private static ThreadLocal<Object> gate = new ThreadLocal<>();
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private static class ThreadTrackHolder {
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static final ThreadTracker TRACKER = new ThreadTracker();
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}
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private static Object tryBeginLookup() {
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return ThreadTrackHolder.TRACKER.tryBegin();
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}
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private static void endLookup(Object key) {
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ThreadTrackHolder.TRACKER.end(key);
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}
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@SuppressWarnings("removal")
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private static URLStreamHandler lookupViaProviders(final String protocol) {
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if (gate.get() != null)
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Object key = tryBeginLookup();
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if (key == null) {
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throw new Error("Circular loading of URL stream handler providers detected");
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gate.set(gate);
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}
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try {
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return AccessController.doPrivileged(
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new PrivilegedAction<>() {
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@ -1366,7 +1376,7 @@ public final class URL implements java.io.Serializable {
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}
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});
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} finally {
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gate.set(null);
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endLookup(key);
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}
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}
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