src/hotspot/share/utilities/singleWriterSynchronizer.cpp

*** 42,52 ****
  
  // Wait until all threads that entered a critical section before
  // synchronization have exited that critical section.
  void SingleWriterSynchronizer::synchronize() {
    // Side-effect in assert balanced by debug-only dec at end.
!   assert(Atomic::add(1u, &_writers) == 1u, "multiple writers");
    // We don't know anything about the muxing between this invocation
    // and invocations in other threads.  We must start with the latest
    // _enter polarity, else we could clobber the wrong _exit value on
    // the first iteration.  So fence to ensure everything here follows
    // whatever muxing was used.
--- 42,52 ----
  
  // Wait until all threads that entered a critical section before
  // synchronization have exited that critical section.
  void SingleWriterSynchronizer::synchronize() {
    // Side-effect in assert balanced by debug-only dec at end.
!   assert(Atomic::add(&_writers, 1u) == 1u, "multiple writers");
    // We don't know anything about the muxing between this invocation
    // and invocations in other threads.  We must start with the latest
    // _enter polarity, else we could clobber the wrong _exit value on
    // the first iteration.  So fence to ensure everything here follows
    // whatever muxing was used.