1 files changed, 85 insertions, 0 deletions
diff --git a/xpcom/threads/RecursiveMutex.cpp b/xpcom/threads/RecursiveMutex.cpp
new file mode 100644
index 0000000000..7c45052c07
--- /dev/null
+++ b/xpcom/threads/RecursiveMutex.cpp
@@ -0,0 +1,85 @@
+/* -*- 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 "mozilla/RecursiveMutex.h"
+
+#ifdef XP_WIN
+#  include <windows.h>
+
+#  define NativeHandle(m) (reinterpret_cast<CRITICAL_SECTION*>(&m))
+#endif
+
+namespace mozilla {
+
+RecursiveMutex::RecursiveMutex(const char* aName)
+    : BlockingResourceBase(aName, eRecursiveMutex)
+#ifdef DEBUG
+      ,
+      mOwningThread(nullptr),
+      mEntryCount(0)
+#endif
+{
+#ifdef XP_WIN
+  // This number was adapted from NSPR.
+  static const DWORD sLockSpinCount = 100;
+
+#  if defined(RELEASE_OR_BETA)
+  // Vista and later automatically allocate and subsequently leak a debug info
+  // object for each critical section that we allocate unless we tell the
+  // system not to do that.
+  DWORD flags = CRITICAL_SECTION_NO_DEBUG_INFO;
+#  else
+  DWORD flags = 0;
+#  endif
+  BOOL r =
+      InitializeCriticalSectionEx(NativeHandle(mMutex), sLockSpinCount, flags);
+  MOZ_RELEASE_ASSERT(r);
+#else
+  pthread_mutexattr_t attr;
+
+  MOZ_RELEASE_ASSERT(pthread_mutexattr_init(&attr) == 0,
+                     "pthread_mutexattr_init failed");
+
+  MOZ_RELEASE_ASSERT(
+      pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) == 0,
+      "pthread_mutexattr_settype failed");
+
+  MOZ_RELEASE_ASSERT(pthread_mutex_init(&mMutex, &attr) == 0,
+                     "pthread_mutex_init failed");
+
+  MOZ_RELEASE_ASSERT(pthread_mutexattr_destroy(&attr) == 0,
+                     "pthread_mutexattr_destroy failed");
+#endif
+}
+
+RecursiveMutex::~RecursiveMutex() {
+#ifdef XP_WIN
+  DeleteCriticalSection(NativeHandle(mMutex));
+#else
+  MOZ_RELEASE_ASSERT(pthread_mutex_destroy(&mMutex) == 0,
+                     "pthread_mutex_destroy failed");
+#endif
+}
+
+void RecursiveMutex::LockInternal() {
+#ifdef XP_WIN
+  EnterCriticalSection(NativeHandle(mMutex));
+#else
+  MOZ_RELEASE_ASSERT(pthread_mutex_lock(&mMutex) == 0,
+                     "pthread_mutex_lock failed");
+#endif
+}
+
+void RecursiveMutex::UnlockInternal() {
+#ifdef XP_WIN
+  LeaveCriticalSection(NativeHandle(mMutex));
+#else
+  MOZ_RELEASE_ASSERT(pthread_mutex_unlock(&mMutex) == 0,
+                     "pthread_mutex_unlock failed");
+#endif
+}
+
+}  // namespace mozilla