1 files changed, 44 insertions, 0 deletions
diff --git a/Source/cm_thread.hxx b/Source/cm_thread.hxx
new file mode 100644
index 000000000..84e6a5c32
--- /dev/null
+++ b/Source/cm_thread.hxx
@@ -0,0 +1,44 @@
+/* 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 shared_mutex
+{
+  uv_rwlock_t _M_;
+  CM_DISABLE_COPY(shared_mutex)
+
+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;
+  CM_DISABLE_COPY(shared_lock)
+
+public:
+  shared_lock(T& m)
+    : _mutex(m)
+  {
+    _mutex.lock_shared();
+  }
+  ~shared_lock() { _mutex.unlock_shared(); }
+};
+}
+#endif