src/hotspot/share/gc/shared/gc_globals.hpp

*** 172,185 ****
                                                                              \
    product(uint, ParallelGCThreads, 0,                                       \
            "Number of parallel threads parallel gc will use")                \
            constraint(ParallelGCThreadsConstraintFunc,AfterErgo)             \
                                                                              \
-   diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true,              \
-             "Use semaphore synchronization for the GC Threads, "            \
-             "instead of synchronization based on mutexes")                  \
-                                                                             \
    product(bool, UseDynamicNumberOfGCThreads, true,                          \
            "Dynamically choose the number of threads up to a maximum of "    \
            "ParallelGCThreads parallel collectors will use for garbage "     \
            "collection work")                                                \
                                                                              \
--- 172,181 ----