summaryrefslogtreecommitdiff
path: root/zen/globals.h
diff options
context:
space:
mode:
Diffstat (limited to 'zen/globals.h')
-rwxr-xr-x[-rw-r--r--]zen/globals.h125
1 files changed, 61 insertions, 64 deletions
diff --git a/zen/globals.h b/zen/globals.h
index 123028c7..a1fd2764 100644..100755
--- a/zen/globals.h
+++ b/zen/globals.h
@@ -1,64 +1,61 @@
-// *****************************************************************************
-// * This file is part of the FreeFileSync project. It is distributed under *
-// * GNU General Public License: http://www.gnu.org/licenses/gpl-3.0 *
-// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
-// *****************************************************************************
-
-#ifndef GLOBALS_H_8013740213748021573485
-#define GLOBALS_H_8013740213748021573485
-
-#include <atomic>
-#include <memory>
-#include "scope_guard.h"
-
-namespace zen
-{
-//solve static destruction order fiasco by providing shared ownership and serialized access to global variables
-template <class T>
-class Global
-{
-public:
- Global() { static_assert(std::is_trivially_destructible<Pod>::value, "this memory needs to live forever"); }
- explicit Global(std::unique_ptr<T>&& newInst) { set(std::move(newInst)); }
- ~Global() { set(nullptr); }
-
- std::shared_ptr<T> get() //=> return std::shared_ptr to let instance life time be handled by caller (MT usage!)
- {
- while (pod.spinLock.exchange(true)) ;
- ZEN_ON_SCOPE_EXIT(pod.spinLock = false);
- if (pod.inst)
- return *pod.inst;
- return nullptr;
- }
-
- void set(std::unique_ptr<T>&& newInst)
- {
- std::shared_ptr<T>* tmpInst = nullptr;
- if (newInst)
- tmpInst = new std::shared_ptr<T>(std::move(newInst));
- {
- while (pod.spinLock.exchange(true)) ;
- ZEN_ON_SCOPE_EXIT(pod.spinLock = false);
- std::swap(pod.inst, tmpInst);
- }
- delete tmpInst;
- }
-
-private:
- //avoid static destruction order fiasco: there may be accesses to "Global<T>::get()" during process shutdown
- //e.g. _("") used by message in debug_minidump.cpp or by some detached thread assembling an error message!
- //=> use trivially-destructible POD only!!!
- struct Pod
- {
- std::shared_ptr<T>* inst = nullptr;
- //serialize access; can't use std::mutex: has non-trival destructor
- std::atomic<bool> spinLock { false };
- } pod;
-};
-
-#if defined _MSC_VER && _MSC_VER < 1900
- #error function scope static initialization is not yet thread-safe!
-#endif
-}
-
-#endif //GLOBALS_H_8013740213748021573485
+// *****************************************************************************
+// * This file is part of the FreeFileSync project. It is distributed under *
+// * GNU General Public License: http://www.gnu.org/licenses/gpl-3.0 *
+// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
+// *****************************************************************************
+
+#ifndef GLOBALS_H_8013740213748021573485
+#define GLOBALS_H_8013740213748021573485
+
+#include <atomic>
+#include <memory>
+#include "scope_guard.h"
+
+namespace zen
+{
+//solve static destruction order fiasco by providing shared ownership and serialized access to global variables
+template <class T>
+class Global
+{
+public:
+ Global() { static_assert(std::is_trivially_destructible<Pod>::value, "this memory needs to live forever"); }
+ explicit Global(std::unique_ptr<T>&& newInst) { set(std::move(newInst)); }
+ ~Global() { set(nullptr); }
+
+ std::shared_ptr<T> get() //=> return std::shared_ptr to let instance life time be handled by caller (MT usage!)
+ {
+ while (pod.spinLock.exchange(true)) ;
+ ZEN_ON_SCOPE_EXIT(pod.spinLock = false);
+ if (pod.inst)
+ return *pod.inst;
+ return nullptr;
+ }
+
+ void set(std::unique_ptr<T>&& newInst)
+ {
+ std::shared_ptr<T>* tmpInst = nullptr;
+ if (newInst)
+ tmpInst = new std::shared_ptr<T>(std::move(newInst));
+ {
+ while (pod.spinLock.exchange(true)) ;
+ ZEN_ON_SCOPE_EXIT(pod.spinLock = false);
+ std::swap(pod.inst, tmpInst);
+ }
+ delete tmpInst;
+ }
+
+private:
+ //avoid static destruction order fiasco: there may be accesses to "Global<T>::get()" during process shutdown
+ //e.g. _("") used by message in debug_minidump.cpp or by some detached thread assembling an error message!
+ //=> use trivially-destructible POD only!!!
+ struct Pod
+ {
+ std::shared_ptr<T>* inst = nullptr;
+ //serialize access; can't use std::mutex: has non-trival destructor
+ std::atomic<bool> spinLock { false };
+ } pod;
+};
+
+}
+
+#endif //GLOBALS_H_8013740213748021573485
bgstack15