src/share/vm/runtime/globals.hpp

*** 1449,1458 ****
--- 1449,1462 ----
            "limiter (a number between 0-100)")                               \
                                                                              \
    product(uintx, ParallelGCThreads, 0,                                      \
            "Number of parallel threads parallel gc will use")                \
                                                                              \
+   diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true,              \
+             "Use semaphore synchronization for the GC Threads, "            \
+             "instead of synchronization based on mutexes")                  \
+                                                                             \
    product(bool, UseDynamicNumberOfGCThreads, false,                         \
            "Dynamically choose the number of parallel threads "              \
            "parallel gc will use")                                           \
                                                                              \
    diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \