From e4bac9b0033658e95261f50098f12665d33c9ae4 Mon Sep 17 00:00:00 2001
From: heck <heck@pep.foundation>
Date: Mon, 28 Feb 2022 23:27:10 +0100
Subject: [PATCH] Import: module 'call_with_lock' from libpEpAdapter

---
 src/call_with_lock.cc |  8 ++++++++
 src/call_with_lock.hh | 26 ++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 src/call_with_lock.cc
 create mode 100644 src/call_with_lock.hh

diff --git a/src/call_with_lock.cc b/src/call_with_lock.cc
new file mode 100644
index 0000000..82a9c49
--- /dev/null
+++ b/src/call_with_lock.cc
@@ -0,0 +1,8 @@
+// This file is under GNU General Public License 3.0
+// see LICENSE.txt
+
+#include "call_with_lock.hh"
+
+namespace pEp {
+    std::mutex call_with_lock_mutex;
+}
diff --git a/src/call_with_lock.hh b/src/call_with_lock.hh
new file mode 100644
index 0000000..7e38dae
--- /dev/null
+++ b/src/call_with_lock.hh
@@ -0,0 +1,26 @@
+// This file is under GNU General Public License 3.0
+// see LICENSE.txt
+
+#ifndef LIBPEPADAPTER_CALL_WITH_LOCK_HH
+#define LIBPEPADAPTER_CALL_WITH_LOCK_HH
+
+#include <mutex>
+
+namespace pEp {
+    extern std::mutex call_with_lock_mutex;
+
+    // TODO: use && and std::forward<> to avoid copying of the arguments.
+    // It is not relevant, yet, because at the moment we use this function
+    // template only for init() and release() which have cheap-to-copy pointer
+    // parameters only
+    template<class R, class... Args>
+    R call_with_lock(R (*fn)(Args...), Args... args)
+    {
+        std::lock_guard<std::mutex> L(call_with_lock_mutex);
+        return fn(args...);
+    }
+
+
+} // namespace pEp
+
+#endif // LIBPEPADAPTER_CALL_WITH_LOCK_HH