Quelle thread.inline.hpp Sprache: C

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#ifndef SHARE_RUNTIME_THREAD_INLINE_HPP
#define SHARE_RUNTIME_THREAD_INLINE_HPP

#include "runtime/javaThread.hpp"

#include "gc/shared/tlab_globals.hpp"
#include "runtime/atomic.hpp"

#if defined(__APPLE__) && defined(AARCH64)
#include "runtime/os.hpp"
#endif

inline jlong Thread::cooked_allocated_bytes() {
  jlong allocated_bytes = Atomic::load_acquire(&_allocated_bytes);
  if (UseTLAB) {
    // These reads are unsynchronized and unordered with the thread updating its tlab pointers.
    // Use only if top > start && used_bytes <= max_tlab_size_bytes.
    const HeapWord* const top = tlab().top_relaxed();
    const HeapWord* const start = tlab().start_relaxed();
    if (top <= start) {
      return allocated_bytes;
    }
    const size_t used_bytes = pointer_delta(top, start, 1);
    if (used_bytes <= ThreadLocalAllocBuffer::max_size_in_bytes()) {
      // Comparing used_bytes with the maximum allowed size will ensure
      // that we don't add the used bytes from a semi-initialized TLAB
      // ending up with incorrect values. There is still a race between
      // incrementing _allocated_bytes and clearing the TLAB, that might
      // cause double counting in rare cases.
      return allocated_bytes + used_bytes;
    }
  }
  return allocated_bytes;
}

inline ThreadsList* Thread::cmpxchg_threads_hazard_ptr(ThreadsList* exchange_value, ThreadsList* compare_value) {
  return (ThreadsList*)Atomic::cmpxchg(&_threads_hazard_ptr, compare_value, exchange_value);
}

inline ThreadsList* Thread::get_threads_hazard_ptr() const {
  return (ThreadsList*)Atomic::load_acquire(&_threads_hazard_ptr);
}

inline void Thread::set_threads_hazard_ptr(ThreadsList* new_list) {
  Atomic::release_store_fence(&_threads_hazard_ptr, new_list);
}

#if defined(__APPLE__) && defined(AARCH64)
inline void Thread::init_wx() {
  assert(this == Thread::current(), "should only be called for current thread");
  assert(!_wx_init, "second init");
  _wx_state = WXWrite;
  os::current_thread_enable_wx(_wx_state);
  DEBUG_ONLY(_wx_init = true);
}

inline WXMode Thread::enable_wx(WXMode new_state) {
  assert(this == Thread::current(), "should only be called for current thread");
  assert(_wx_init, "should be inited");
  WXMode old = _wx_state;
  if (_wx_state != new_state) {
    _wx_state = new_state;
    os::current_thread_enable_wx(new_state);
  }
  return old;
}
#endif // __APPLE__ && AARCH64

#endif // SHARE_RUNTIME_THREAD_INLINE_HPP

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