内存屏障和 TLB

I am seeing a problem where the JVM (java 7 update 1) sometimes crashes with memory errors (SIGBUS, SIGSEG) when passing a MappedByteBuffer between threads.

例如

final AtomicReference<MappedByteBuffer> mbbQueue = new AtomicReference<>();

// in a background thread.
MappedByteBuffer map = raf.map(MapMode.READ_WRITE, offset, allocationSize);
Thread.yield();
while (!inQueue.compareAndSet(null, map));


// the main thread. (more than 10x faster than using map() in the same thread)
MappedByteBuffer mbb = inQueue.getAndSet(null);

如果没有 Thread.yield()，我偶尔会在 force()、put() 和 C 的 memcpy() 中崩溃，所有这些都表明我试图非法访问内存.使用 Thread.yield() 我没有遇到问题，但这听起来不是一个可靠的解决方案.