8169517: WhiteBox should provide concurrent GC phase control
Added WhiteBox API and G1 implementation.
Reviewed-by: shade, dfazunen
diff --git a/test/lib/sun/hotspot/WhiteBox.java b/test/lib/sun/hotspot/WhiteBox.java
index 0198f0a..f72de59 100644
--- a/test/lib/sun/hotspot/WhiteBox.java
+++ b/test/lib/sun/hotspot/WhiteBox.java
@@ -390,6 +390,39 @@
// Force Full GC
public native void fullGC();
+ // Returns true if the current GC supports control of its concurrent
+ // phase via requestConcurrentGCPhase(). If false, a request will
+ // always fail.
+ public native boolean supportsConcurrentGCPhaseControl();
+
+ // Returns an array of concurrent phase names provided by this
+ // collector. These are the names recognized by
+ // requestConcurrentGCPhase().
+ public native String[] getConcurrentGCPhases();
+
+ // Attempt to put the collector into the indicated concurrent phase,
+ // and attempt to remain in that state until a new request is made.
+ //
+ // Returns immediately if already in the requested phase.
+ // Otherwise, waits until the phase is reached.
+ //
+ // Throws IllegalStateException if unsupported by the current collector.
+ // Throws NullPointerException if phase is null.
+ // Throws IllegalArgumentException if phase is not valid for the current collector.
+ public void requestConcurrentGCPhase(String phase) {
+ if (!supportsConcurrentGCPhaseControl()) {
+ throw new IllegalStateException("Concurrent GC phase control not supported");
+ } else if (phase == null) {
+ throw new NullPointerException("null phase");
+ } else if (!requestConcurrentGCPhase0(phase)) {
+ throw new IllegalArgumentException("Unknown concurrent GC phase: " + phase);
+ }
+ }
+
+ // Helper for requestConcurrentGCPhase(). Returns true if request
+ // succeeded, false if the phase is invalid.
+ private native boolean requestConcurrentGCPhase0(String phase);
+
// Method tries to start concurrent mark cycle.
// It returns false if CM Thread is always in concurrent cycle.
public native boolean g1StartConcMarkCycle();
