From 89fb42ab069321087be8cc49f25b8ff5a3a956a6 Mon Sep 17 00:00:00 2001
From: Jan Varga <jan.varga@gmail.com>
Date: Thu, 29 Nov 2018 21:47:17 +0100
Subject: [PATCH] Bug 1286798 - Part 2: Add IsOnDOMFileThread() and
 AssertIsOnDOMFileThread() generic helper methods; r=asuth

---
 dom/file/ipc/IPCBlobInputStreamThread.cpp | 17 +++++++++++++++++
 dom/file/ipc/IPCBlobInputStreamThread.h   |  6 ++++++
 2 files changed, 23 insertions(+)

diff --git a/dom/file/ipc/IPCBlobInputStreamThread.cpp b/dom/file/ipc/IPCBlobInputStreamThread.cpp
index 15671b7cb769..a4cfa52a442b 100644
--- a/dom/file/ipc/IPCBlobInputStreamThread.cpp
+++ b/dom/file/ipc/IPCBlobInputStreamThread.cpp
@@ -247,5 +247,22 @@ IPCBlobInputStreamThread::DelayedDispatch(already_AddRefed<nsIRunnable>, uint32_
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 
+bool
+IsOnDOMFileThread()
+{
+  mozilla::StaticMutexAutoLock lock(gIPCBlobThreadMutex);
+
+  MOZ_ASSERT(!gShutdownHasStarted);
+  MOZ_ASSERT(gIPCBlobThread);
+
+  return gIPCBlobThread->IsOnCurrentThreadInfallible();
+}
+
+void
+AssertIsOnDOMFileThread()
+{
+  MOZ_ASSERT(IsOnDOMFileThread());
+}
+
 } // dom namespace
 } // mozilla namespace
diff --git a/dom/file/ipc/IPCBlobInputStreamThread.h b/dom/file/ipc/IPCBlobInputStreamThread.h
index 45900a6182a6..02bda56e1de7 100644
--- a/dom/file/ipc/IPCBlobInputStreamThread.h
+++ b/dom/file/ipc/IPCBlobInputStreamThread.h
@@ -54,6 +54,12 @@ private:
   nsTArray<RefPtr<IPCBlobInputStreamChild>> mPendingActors;
 };
 
+bool
+IsOnDOMFileThread();
+
+void
+AssertIsOnDOMFileThread();
+
 } // dom namespace
 } // mozilla namespace