Adding upstream version 86.0.1.upstream/86.0.1upstream

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

1 files changed, 78 insertions, 0 deletions

diff --git a/xpcom/build/LateWriteChecks.h b/xpcom/build/LateWriteChecks.h
new file mode 100644
index 0000000000..6c9ee419f9
--- /dev/null
+++ b/xpcom/build/LateWriteChecks.h
@@ -0,0 +1,78 @@
+/* -*- 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/. */
+
+#ifndef mozilla_LateWriteChecks_h
+#define mozilla_LateWriteChecks_h
+
+// This file, along with LateWriteChecks.cpp, serves to check for and report
+// late writes. The idea is discover writes to the file system that happens
+// during shutdown such that these maybe be moved forward and the process may be
+// killed without waiting for static destructors.
+
+namespace mozilla {
+
+/** Different shutdown check modes */
+enum ShutdownChecksMode {
+  SCM_CRASH,  /** Crash on shutdown check failure */
+  SCM_RECORD, /** Record shutdown check violations */
+  SCM_NOTHING /** Don't attempt any shutdown checks */
+};
+
+/**
+ * Current shutdown check mode.
+ * This variable is defined and initialized in nsAppRunner.cpp
+ */
+extern ShutdownChecksMode gShutdownChecks;
+
+/**
+ * Allocate structures and acquire information from XPCOM necessary to do late
+ * write checks. This function must be invoked before BeginLateWriteChecks()
+ * and before XPCOM has stopped working.
+ */
+void InitLateWriteChecks();
+
+/**
+ * Begin recording all writes as late-writes. This function should be called
+ * when all legitimate writes have occurred. This function does not rely on
+ * XPCOM as it is designed to be invoked during XPCOM shutdown.
+ *
+ * For late-write checks to work you must initialize one or more backends that
+ * reports IO through the IOInterposer API. PoisonIOInterposer would probably
+ * be the backend of choice in this case.
+ *
+ * Note: BeginLateWriteChecks() must have been invoked before this function.
+ */
+void BeginLateWriteChecks();
+
+/**
+ * Stop recording all writes as late-writes, call this function when you want
+ * late-write checks to stop. I.e. exception handling, or the special case on
+ * Mac described in bug 826029.
+ */
+void StopLateWriteChecks();
+
+/**
+ * Temporarily suspend late write checks for the current thread. This is useful
+ * if you're about to perform a write, but it would be fine if this write were
+ * interrupted or skipped during a fast shutdown.
+ */
+void PushSuspendLateWriteChecks();
+
+/**
+ * Resume late write checks for the current thread, assuming an ancestor in the
+ * call stack hasn't also pushed a suspension.
+ */
+void PopSuspendLateWriteChecks();
+
+class MOZ_RAII AutoSuspendLateWriteChecks {
+ public:
+  AutoSuspendLateWriteChecks() { PushSuspendLateWriteChecks(); }
+  ~AutoSuspendLateWriteChecks() { PopSuspendLateWriteChecks(); }
+};
+
+}  // namespace mozilla
+
+#endif  // mozilla_LateWriteChecks_h