Thread scheduling parameters: Use ZMQ context options instead of

environment variables.

src/kqueue.hpp

@@ -27,6 +27,7 @@
 #include <vector>
 #include <unistd.h>
 
+#include "ctx.hpp"
 #include "fd.hpp"
 #include "thread.hpp"
 #include "poller_base.hpp"
@@ -45,7 +46,7 @@ namespace zmq
 
         typedef void* handle_t;
 
-        kqueue_t ();
+        kqueue_t (const ctx_t &ctx_);
         ~kqueue_t ();
 
         //  "poller" concept.
@@ -68,6 +69,9 @@ namespace zmq
         //  Main event loop.
         void loop ();
 
+        // Reference to ZMQ context.
+        const ctx_t &ctx;
+
         //  File descriptor referring to the kernel event queue.
         fd_t kqueue_fd;