Shutdown cleanup prep-work

Create a boost::thread_group object at the qt/bitcoind main-loop level
that will hold pointers to all the main-loop threads.

This will replace the vnThreadsRunning[] array.

For testing, ported the BitcoinMiner threads to use its
own boost::thread_group.

1 files changed, 6 insertions, 3 deletions

diff --git a/src/util.cpp b/src/util.cpp
index fc3e846a6b..ba012d3216 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -1431,9 +1431,12 @@ void RenameThread(const char* name)
     //       removed.
     pthread_set_name_np(pthread_self(), name);
 
-// This is XCode 10.6-and-later; bring back if we drop 10.5 support:
-// #elif defined(MAC_OSX)
-//    pthread_setname_np(name);
+#elif defined(MAC_OSX) && defined(__MAC_OS_X_VERSION_MAX_ALLOWED)
+
+// pthread_setname_np is XCode 10.6-and-later
+#if __MAC_OS_X_VERSION_MAX_ALLOWED >= 1060
+    pthread_setname_np(name);
+#endif
 
 #else
     // Prevent warnings for unused parameters...