diff --git a/libc/bionic/pthread_internals.cpp b/libc/bionic/pthread_internals.cpp
new file mode 100644
index 0000000..66bc5b7
--- /dev/null
+++ b/libc/bionic/pthread_internals.cpp
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2008 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_internal.h"
+
+#include "bionic_tls.h"
+#include "ScopedPthreadMutexLocker.h"
+
+__LIBC_HIDDEN__ pthread_internal_t* gThreadList = NULL;
+__LIBC_HIDDEN__ pthread_mutex_t gThreadListLock = PTHREAD_MUTEX_INITIALIZER;
+
+void _pthread_internal_remove_locked(pthread_internal_t* thread) {
+  if (thread->next != NULL) {
+    thread->next->prev = thread->prev;
+  }
+  if (thread->prev != NULL) {
+    thread->prev->next = thread->next;
+  } else {
+    gThreadList = thread->next;
+  }
+
+  // The main thread is not heap-allocated. See __libc_init_tls for the declaration,
+  // and __libc_init_common for the point where it's added to the thread list.
+  if (thread->allocated_on_heap) {
+    free(thread);
+  }
+}
+
+__LIBC_ABI_PRIVATE__ void _pthread_internal_add(pthread_internal_t* thread) {
+  ScopedPthreadMutexLocker locker(&gThreadListLock);
+
+  // We insert at the head.
+  thread->next = gThreadList;
+  thread->prev = NULL;
+  if (thread->next != NULL) {
+    thread->next->prev = thread;
+  }
+  gThreadList = thread;
+}
+
+__LIBC_ABI_PRIVATE__ pthread_internal_t* __get_thread(void) {
+  void** tls = reinterpret_cast<void**>(const_cast<void*>(__get_tls()));
+  return reinterpret_cast<pthread_internal_t*>(tls[TLS_SLOT_THREAD_ID]);
+}