[Support] Base SmartMutex on std::recursive_mutex

- Remove support for non-recursive mutexes. This was unused.
- The std::recursive_mutex is now created/destroyed unconditionally.
  Locking is still only done if threading is enabled.
- Alias SmartScopedLock to std::lock_guard.

This should make no semantic difference on the existing APIs.

llvm-svn: 368158

1 files changed, 0 insertions, 42 deletions

diff --git a/llvm/lib/Support/Unix/Mutex.inc b/llvm/lib/Support/Unix/Mutex.inc
deleted file mode 100644
index 2c982b38d6f..00000000000
--- a/llvm/lib/Support/Unix/Mutex.inc
+++ /dev/null
@@ -1,42 +0,0 @@
-//===- llvm/Support/Unix/Mutex.inc - Unix Mutex Implementation ---*- C++ -*-===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements the Unix specific (non-pthread) Mutex class.
-//
-//===----------------------------------------------------------------------===//
-
-//===----------------------------------------------------------------------===//
-//=== WARNING: Implementation here must contain only generic UNIX code that
-//===          is guaranteed to work on *all* UNIX variants.
-//===----------------------------------------------------------------------===//
-
-namespace llvm
-{
-using namespace sys;
-
-MutexImpl::MutexImpl( bool recursive)
-{
-}
-
-MutexImpl::~MutexImpl()
-{
-}
-
-bool
-MutexImpl::release()
-{
-  return true;
-}
-
-bool
-MutexImpl::tryacquire( void )
-{
-  return true;
-}
-
-}