From 2636d86ce2f45f06bdcf4cb60c15df55838a3aa7 Mon Sep 17 00:00:00 2001
From: Justin Berger <j.david.berger@gmail.com>
Date: Mon, 21 Aug 2017 12:27:10 -0600
Subject: utility: Added minimal std::thread drop-in

---
 Source/CMakeLists.txt |  1 +
 Source/cm_thread.hxx  | 78 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 79 insertions(+)
 create mode 100644 Source/cm_thread.hxx

diff --git a/Source/CMakeLists.txt b/Source/CMakeLists.txt
index e1c34bf..b016f40 100644
--- a/Source/CMakeLists.txt
+++ b/Source/CMakeLists.txt
@@ -593,6 +593,7 @@ set(SRCS
   cm_utf8.c
   cm_codecvt.hxx
   cm_codecvt.cxx
+  cm_thread.hxx
   )
 
 SET_PROPERTY(SOURCE cmProcessOutput.cxx APPEND PROPERTY COMPILE_DEFINITIONS
diff --git a/Source/cm_thread.hxx b/Source/cm_thread.hxx
new file mode 100644
index 0000000..b8c25c7
--- /dev/null
+++ b/Source/cm_thread.hxx
@@ -0,0 +1,78 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#ifndef CM_THREAD_HXX
+#define CM_THREAD_HXX
+
+#include "cmConfigure.h" // IWYU pragma: keep
+#include "cm_uv.h"
+
+namespace cm {
+class mutex
+{
+  uv_mutex_t _M_;
+
+public:
+  mutex() { uv_mutex_init(&_M_); }
+  ~mutex() { uv_mutex_destroy(&_M_); }
+
+  void lock() { uv_mutex_lock(&_M_); }
+
+  void unlock() { uv_mutex_unlock(&_M_); }
+};
+
+template <typename T>
+class lock_guard
+{
+  T& _mutex;
+
+public:
+  lock_guard(T& m)
+    : _mutex(m)
+  {
+    _mutex.lock();
+  }
+  ~lock_guard() { _mutex.unlock(); }
+};
+
+class shared_mutex
+{
+  uv_rwlock_t _M_;
+
+public:
+  shared_mutex() { uv_rwlock_init(&_M_); }
+  ~shared_mutex() { uv_rwlock_destroy(&_M_); }
+
+  void lock() { uv_rwlock_wrlock(&_M_); }
+
+  void unlock() { uv_rwlock_wrunlock(&_M_); }
+
+  void lock_shared() { uv_rwlock_rdlock(&_M_); }
+
+  void unlock_shared() { uv_rwlock_rdunlock(&_M_); }
+};
+
+template <typename T>
+class shared_lock
+{
+  T& _mutex;
+
+public:
+  shared_lock(T& m)
+    : _mutex(m)
+  {
+    _mutex.lock_shared();
+  }
+  ~shared_lock() { _mutex.unlock_shared(); }
+};
+
+template <typename T>
+class unique_lock : public lock_guard<T>
+{
+public:
+  unique_lock(T& m)
+    : lock_guard<T>(m)
+  {
+  }
+};
+}
+#endif
-- 
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