From 91360e7d3cb0dc0934539b3bcad6ac6e8572678c Mon Sep 17 00:00:00 2001
From: Ondrej Mikle <ondrej.mikle@gmail.com>
Date: Sun, 29 Oct 2017 22:28:30 +0100
Subject: [PATCH] Comment about GIL while polling with NFC reader

---
 nfc_smartcard.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/nfc_smartcard.cpp b/nfc_smartcard.cpp
index 89ac373..64a78b7 100644
--- a/nfc_smartcard.cpp
+++ b/nfc_smartcard.cpp
@@ -104,6 +104,8 @@ std::string NFCDevice::scanUID() throw(NFCError)
         throw NFCError("NFC device not opened");
     }
 
+    // We release GIL because otherwise it would block other threads. Since this polling is de-facto sleep and
+    // doesn't touch any variables, it works as a language without GIL would.
     Py_BEGIN_ALLOW_THREADS
     res = nfc_initiator_poll_target(_nfcDevice, _modulations, _modulationsLen, pollNr, pollPeriod, &nt);
     Py_END_ALLOW_THREADS