Thread scheduling parameters: Use ZMQ context options instead of

environment variables.

src/devpoll.hpp

@@ -26,6 +26,7 @@
 
 #include <vector>
 
+#include "ctx.hpp"
 #include "fd.hpp"
 #include "thread.hpp"
 #include "poller_base.hpp"
@@ -43,7 +44,7 @@ namespace zmq
 
         typedef fd_t handle_t;
 
-        devpoll_t ();
+        devpoll_t (const ctx_t &ctx_);
         ~devpoll_t ();
 
         //  "poller" concept.
@@ -66,6 +67,9 @@ namespace zmq
         //  Main event loop.
         void loop ();
 
+        // Reference to ZMQ context.
+        const ctx_t &ctx;
+
         //  File descriptor referring to "/dev/poll" pseudo-device.
         fd_t devpoll_fd;