Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 173 insertions, 0 deletions

diff --git a/dom/locks/LockManagerParent.cpp b/dom/locks/LockManagerParent.cpp
new file mode 100644
index 0000000000..4af7fe2129
--- /dev/null
+++ b/dom/locks/LockManagerParent.cpp
@@ -0,0 +1,173 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "LockManagerParent.h"
+#include "LockRequestParent.h"
+
+#include "mozilla/PrincipalHashKey.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/dom/locks/PLockManager.h"
+#include "mozilla/media/MediaUtils.h"
+#include "nsIDUtils.h"
+#include "nsTHashMap.h"
+
+namespace mozilla::dom::locks {
+
+static StaticAutoPtr<nsTHashMap<PrincipalHashKey, WeakPtr<ManagedLocks>>>
+    sManagedLocksMap;
+
+using IPCResult = mozilla::ipc::IPCResult;
+
+LockManagerParent::LockManagerParent(NotNull<nsIPrincipal*> aPrincipal,
+                                     const nsID& aClientId)
+    : mClientId(NSID_TrimBracketsUTF16(aClientId)), mPrincipal(aPrincipal) {
+  if (!sManagedLocksMap) {
+    sManagedLocksMap =
+        new nsTHashMap<PrincipalHashKey, WeakPtr<ManagedLocks>>();
+  } else {
+    mManagedLocks = sManagedLocksMap->Get(aPrincipal);
+  }
+
+  if (!mManagedLocks) {
+    mManagedLocks = new ManagedLocks();
+    sManagedLocksMap->LookupOrInsert(aPrincipal, mManagedLocks);
+  }
+}
+
+void LockManagerParent::ActorDestroy(ActorDestroyReason aWhy) {
+  if (!mManagedLocks) {
+    return;
+  }
+
+  nsTArray<nsString> affectedResourceNames;
+
+  mManagedLocks->mHeldLocks.RemoveElementsBy(
+      [this, &affectedResourceNames](const RefPtr<LockRequestParent>& request) {
+        bool equals = request->Manager() == this;
+        if (equals) {
+          affectedResourceNames.AppendElement(request->Data().name());
+        }
+        return equals;
+      });
+
+  for (auto& queue : mManagedLocks->mQueueMap) {
+    queue.GetModifiableData()->RemoveElementsBy(
+        [this, &name = queue.GetKey(),
+         &affectedResourceNames](const RefPtr<LockRequestParent>& request) {
+          bool equals = request->Manager() == this;
+          if (equals) {
+            affectedResourceNames.AppendElement(name);
+          }
+          return equals;
+        });
+  }
+
+  for (const nsString& name : affectedResourceNames) {
+    if (auto queue = mManagedLocks->mQueueMap.Lookup(name)) {
+      ProcessRequestQueue(queue.Data());
+    }
+  }
+
+  mManagedLocks = nullptr;
+  // We just decreased the refcount and potentially deleted it, so check whether
+  // the weak pointer still points to anything and remove the entry if not.
+  if (!sManagedLocksMap->Get(mPrincipal)) {
+    sManagedLocksMap->Remove(mPrincipal);
+  }
+}
+
+void LockManagerParent::ProcessRequestQueue(
+    nsTArray<RefPtr<LockRequestParent>>& aQueue) {
+  while (aQueue.Length()) {
+    RefPtr<LockRequestParent> first = aQueue[0];
+    if (!IsGrantableRequest(first->Data())) {
+      break;
+    }
+    aQueue.RemoveElementAt(0);
+    mManagedLocks->mHeldLocks.AppendElement(first);
+    Unused << NS_WARN_IF(!first->SendResolve(first->Data().lockMode(), true));
+  }
+}
+
+bool LockManagerParent::IsGrantableRequest(const IPCLockRequest& aRequest) {
+  for (const auto& held : mManagedLocks->mHeldLocks) {
+    if (held->Data().name() == aRequest.name()) {
+      if (aRequest.lockMode() == LockMode::Exclusive) {
+        return false;
+      }
+      MOZ_ASSERT(aRequest.lockMode() == LockMode::Shared);
+      if (held->Data().lockMode() == LockMode::Exclusive) {
+        return false;
+      }
+    }
+  }
+  return true;
+}
+
+IPCResult LockManagerParent::RecvQuery(QueryResolver&& aResolver) {
+  LockManagerSnapshot snapshot;
+  snapshot.mHeld.Construct();
+  snapshot.mPending.Construct();
+  for (const auto& queueMapEntry : mManagedLocks->mQueueMap) {
+    for (const RefPtr<LockRequestParent>& request : queueMapEntry.GetData()) {
+      LockInfo info;
+      info.mMode.Construct(request->Data().lockMode());
+      info.mName.Construct(request->Data().name());
+      info.mClientId.Construct(
+          static_cast<LockManagerParent*>(request->Manager())->mClientId);
+      if (!snapshot.mPending.Value().AppendElement(info, mozilla::fallible)) {
+        return IPC_FAIL(this, "Out of memory");
+      };
+    }
+  }
+  for (const RefPtr<LockRequestParent>& request : mManagedLocks->mHeldLocks) {
+    LockInfo info;
+    info.mMode.Construct(request->Data().lockMode());
+    info.mName.Construct(request->Data().name());
+    info.mClientId.Construct(
+        static_cast<LockManagerParent*>(request->Manager())->mClientId);
+    if (!snapshot.mHeld.Value().AppendElement(info, mozilla::fallible)) {
+      return IPC_FAIL(this, "Out of memory");
+    };
+  }
+  aResolver(snapshot);
+  return IPC_OK();
+};
+
+already_AddRefed<PLockRequestParent> LockManagerParent::AllocPLockRequestParent(
+    const IPCLockRequest& aRequest) {
+  return MakeAndAddRef<LockRequestParent>(aRequest);
+}
+
+IPCResult LockManagerParent::RecvPLockRequestConstructor(
+    PLockRequestParent* aActor, const IPCLockRequest& aRequest) {
+  RefPtr<LockRequestParent> actor = static_cast<LockRequestParent*>(aActor);
+  nsTArray<RefPtr<LockRequestParent>>& queue =
+      mManagedLocks->mQueueMap.LookupOrInsert(aRequest.name());
+  if (aRequest.steal()) {
+    mManagedLocks->mHeldLocks.RemoveElementsBy(
+        [&aRequest](const RefPtr<LockRequestParent>& aHeld) {
+          if (aHeld->Data().name() == aRequest.name()) {
+            Unused << NS_WARN_IF(
+                !PLockRequestParent::Send__delete__(aHeld, true));
+            return true;
+          }
+          return false;
+        });
+    queue.InsertElementAt(0, actor);
+  } else if (aRequest.ifAvailable() &&
+             (!queue.IsEmpty() || !IsGrantableRequest(actor->Data()))) {
+    Unused << NS_WARN_IF(!aActor->SendResolve(aRequest.lockMode(), false));
+    return IPC_OK();
+  } else {
+    queue.AppendElement(actor);
+  }
+  ProcessRequestQueue(queue);
+  return IPC_OK();
+}
+
+}  // namespace mozilla::dom::locks