diff --git a/libc/malloc_debug/debug_disable.cpp b/libc/malloc_debug/debug_disable.cpp
new file mode 100644
index 0000000..af0264b
--- /dev/null
+++ b/libc/malloc_debug/debug_disable.cpp
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <pthread.h>
+
+#include "DebugData.h"
+#include "debug_disable.h"
+#include "debug_log.h"
+
+extern DebugData* g_debug;
+pthread_key_t g_disable_key;
+
+bool DebugCallsDisabled() {
+  if (g_debug == nullptr || pthread_getspecific(g_disable_key) != nullptr) {
+    return true;
+  }
+  return false;
+}
+
+bool DebugDisableInitialize() {
+  int error = pthread_key_create(&g_disable_key, nullptr);
+  if (error != 0) {
+    error_log("pthread_key_create failed: %s", strerror(error));
+    return false;
+  }
+  pthread_setspecific(g_disable_key, nullptr);
+
+  return true;
+}
+
+void DebugDisableFinalize() {
+  pthread_key_delete(g_disable_key);
+}
+
+void DebugDisableSet(bool disable) {
+  if (disable) {
+    pthread_setspecific(g_disable_key, reinterpret_cast<void*>(1));
+  } else {
+    pthread_setspecific(g_disable_key, nullptr);
+  }
+}