utility: Added minimal std::thread drop-in

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

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