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Bug 1474793 - Part 10.4: Add ToShmem impl for shared_lock::Locked. r=emilio
Depends on D17192 Differential Revision: https://phabricator.services.mozilla.com/D17193 --HG-- extra : moz-landing-system : lando
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@ -16,7 +16,10 @@ use std::fmt;
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#[cfg(feature = "servo")]
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use std::mem;
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#[cfg(feature = "gecko")]
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use std::mem::ManuallyDrop;
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#[cfg(feature = "gecko")]
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use std::ptr;
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use to_shmem::{SharedMemoryBuilder, ToShmem};
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/// A shared read/write lock that can protect multiple objects.
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///
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@ -238,6 +241,26 @@ impl<T> Locked<T> {
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}
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}
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#[cfg(feature = "gecko")]
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impl<T: ToShmem> ToShmem for Locked<T> {
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fn to_shmem(&self, builder: &mut SharedMemoryBuilder) -> ManuallyDrop<Self> {
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let guard = self.shared_lock.read();
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ManuallyDrop::new(Locked {
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shared_lock: SharedRwLock::read_only(),
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data: UnsafeCell::new(ManuallyDrop::into_inner(
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self.read_with(&guard).to_shmem(builder),
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)),
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})
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}
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}
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#[cfg(feature = "servo")]
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impl<T: ToShmem> ToShmem for Locked<T> {
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fn to_shmem(&self, _builder: &mut SharedMemoryBuilder) -> ManuallyDrop<Self> {
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panic!("ToShmem not supported in Servo currently")
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}
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}
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#[allow(dead_code)]
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mod compile_time_assert {
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use super::{SharedRwLockReadGuard, SharedRwLockWriteGuard};
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