Merge System into Support.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120298 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 54 insertions, 0 deletions

diff --git a/include/llvm/Support/ThreadLocal.h b/include/llvm/Support/ThreadLocal.h
new file mode 100644
index 0000000000..155a4db818
--- /dev/null
+++ b/include/llvm/Support/ThreadLocal.h
@@ -0,0 +1,54 @@
+//===- llvm/System/ThreadLocal.h - Thread Local Data ------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the llvm::sys::ThreadLocal class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SYSTEM_THREAD_LOCAL_H
+#define LLVM_SYSTEM_THREAD_LOCAL_H
+
+#include "llvm/Support/Threading.h"
+#include <cassert>
+
+namespace llvm {
+  namespace sys {
+    // ThreadLocalImpl - Common base class of all ThreadLocal instantiations.
+    // YOU SHOULD NEVER USE THIS DIRECTLY.
+    class ThreadLocalImpl {
+      void* data;
+    public:
+      ThreadLocalImpl();
+      virtual ~ThreadLocalImpl();
+      void setInstance(const void* d);
+      const void* getInstance();
+      void removeInstance();
+    };
+
+    /// ThreadLocal - A class used to abstract thread-local storage.  It holds,
+    /// for each thread, a pointer a single object of type T.
+    template<class T>
+    class ThreadLocal : public ThreadLocalImpl {
+    public:
+      ThreadLocal() : ThreadLocalImpl() { }
+
+      /// get - Fetches a pointer to the object associated with the current
+      /// thread.  If no object has yet been associated, it returns NULL;
+      T* get() { return static_cast<T*>(getInstance()); }
+
+      // set - Associates a pointer to an object with the current thread.
+      void set(T* d) { setInstance(d); }
+
+      // erase - Removes the pointer associated with the current thread.
+      void erase() { removeInstance(); }
+    };
+  }
+}
+
+#endif