RFR: 8293282: LoadLibraryUnloadTest.java fails with "Too few cleared WeakReferences"

[Mandy Chung]

On Thu, 8 Sep 2022 20:26:41 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

> Modify the LoadLibraryUnload test to call gc() more a few times, allowing multiple gc cycles to queue the expected refs.
> Short the timeout on each cycle to 10 sec.

test/jdk/java/lang/ClassLoader/loadLibraryUnload/LoadLibraryUnload.java line 171:

> 169:                 dequeueCount++;
> 170:         }
> 171:         Asserts.assertEquals(dequeueCount, LOADER_COUNT, "Too few cleared WeakReferences");

This only invokes GC `LOADER_COUNT` times.  I think you may want something like what ForceGC does:


        int retries = (int)(Math.round(1000L * TIMEOUT_FACTOR) / 200);
        for (; retries >= 0; retries--) {
            if (dequeueCount == LOADER_COUNT) return;
            
            System.gc();
            refQueue.remove(200L);
        }

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PR: https://git.openjdk.org/jdk/pull/10223