blob: 600dda8b504e4ad48ab4aaece899772b474be1b0 [file] [log] [blame]
* Copyright 2017 The WebRTC Project Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
#include "rtc_base/atomic_ops.h"
#include "rtc_base/ref_count.h"
namespace webrtc {
namespace webrtc_impl {
class RefCounter {
explicit RefCounter(int ref_count) : ref_count_(ref_count) {}
RefCounter() = delete;
void IncRef() { rtc::AtomicOps::Increment(&ref_count_); }
// Returns kDroppedLastRef if this call dropped the last reference; the caller
// should therefore free the resource protected by the reference counter.
// Otherwise, returns kOtherRefsRemained (note that in case of multithreading,
// some other caller may have dropped the last reference by the time this call
// returns; all we know is that we didn't do it).
rtc::RefCountReleaseStatus DecRef() {
return (rtc::AtomicOps::Decrement(&ref_count_) == 0)
? rtc::RefCountReleaseStatus::kDroppedLastRef
: rtc::RefCountReleaseStatus::kOtherRefsRemained;
// Return whether the reference count is one. If the reference count is used
// in the conventional way, a reference count of 1 implies that the current
// thread owns the reference and no other thread shares it. This call performs
// the test for a reference count of one, and performs the memory barrier
// needed for the owning thread to act on the resource protected by the
// reference counter, knowing that it has exclusive access.
bool HasOneRef() const {
return rtc::AtomicOps::AcquireLoad(&ref_count_) == 1;
volatile int ref_count_;
} // namespace webrtc_impl
} // namespace webrtc