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-rw-r--r--xpcom/threads/RecursiveMutex.cpp85
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