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247   uptr prev = atomic_fetch_sub(&state_, kWriteLock, memory_order_release);
248   (void)prev;
249   DCHECK_NE(prev & kWriteLock, 0);
259   uptr prev = atomic_fetch_add(&state_, kReadLock, memory_order_acquire);
260   if ((prev & kWriteLock) == 0)
263     prev = atomic_load(&state_, memory_order_acquire);
264     if ((prev & kWriteLock) == 0) {
274   uptr prev = atomic_fetch_sub(&state_, kReadLock, memory_order_release);
275   (void)prev;
276   DCHECK_EQ(prev & kWriteLock, 0);
277   DCHECK_GT(prev & ~kWriteLock, 0);