Functions passed to pthread_create are declared as extern "C"

So far these were declared as C++ static functions which
was incorrect and caused warnings with SunStudio.

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>

src/thread.cpp

@@ -23,6 +23,16 @@
 
 #ifdef ZMQ_HAVE_WINDOWS
 
+extern "C"
+{
+    static unsigned int __stdcall thread_routine (void *arg_)
+    {
+        thread_t *self = (zmq::thread_t*) arg_;
+        self->tfn (self->arg);
+        return 0;
+    }
+}
+
 void zmq::thread_t::start (thread_fn *tfn_, void *arg_)
 {
     tfn = tfn_;
@@ -38,17 +48,30 @@ void zmq::thread_t::stop ()
     win_assert (rc != WAIT_FAILED);
 }
 
-unsigned int __stdcall zmq::thread_t::thread_routine (void *arg_)
-{
-    thread_t *self = (thread_t*) arg_;
-    self->tfn (self->arg);
-    return 0;
-}
-
 #else
 
 #include <signal.h>
 
+extern "C"
+{
+    static void *thread_routine (void *arg_)
+    {
+    #if !defined ZMQ_HAVE_OPENVMS
+        //  Following code will guarantee more predictable latecnies as it'll
+        //  disallow any signal handling in the I/O thread.
+        sigset_t signal_set;
+        int rc = sigfillset (&signal_set);
+        errno_assert (rc == 0);
+        rc = pthread_sigmask (SIG_BLOCK, &signal_set, NULL);
+        errno_assert (rc == 0);
+    #endif
+
+        zmq::thread_t *self = (zmq::thread_t*) arg_;   
+        self->tfn (self->arg);
+        return NULL;
+    }
+}
+
 void zmq::thread_t::start (thread_fn *tfn_, void *arg_)
 {
     tfn = tfn_;
@@ -63,23 +86,6 @@ void zmq::thread_t::stop ()
     errno_assert (rc == 0);
 }
 
-void *zmq::thread_t::thread_routine (void *arg_)
-{
-#if !defined ZMQ_HAVE_OPENVMS
-    //  Following code will guarantee more predictable latecnies as it'll
-    //  disallow any signal handling in the I/O thread.
-    sigset_t signal_set;
-    int rc = sigfillset (&signal_set);
-    errno_assert (rc == 0);
-    rc = pthread_sigmask (SIG_BLOCK, &signal_set, NULL);
-    errno_assert (rc == 0);
-#endif
-
-    thread_t *self = (thread_t*) arg_;   
-    self->tfn (self->arg);
-    return NULL;
-}
-
 #endif
 
 

src/thread.hpp

@@ -55,19 +55,19 @@ namespace zmq
         //  Waits for thread termination.
         void stop ();
 
+        //  These are internal members. They should be private, however then
+        //  they would not be accessible from the main C routine of the thread.
+        thread_fn *tfn;
+        void *arg;
+        
     private:
 
 #ifdef ZMQ_HAVE_WINDOWS
-        static unsigned int __stdcall thread_routine (void *arg_);
         HANDLE descriptor;
 #else
-        static void *thread_routine (void *arg_);
         pthread_t descriptor;
 #endif
 
-        thread_fn *tfn;
-        void *arg;
-
         thread_t (const thread_t&);
         void operator = (const thread_t&);
     };

tests/test_shutdown_stress.cpp

@@ -24,7 +24,9 @@
 
 #define THREAD_COUNT 100
 
-void *worker (void *s)
+extern "C"
+{
+    static void *worker (void *s)
     {
         int rc;
 
@@ -37,6 +39,7 @@ void *worker (void *s)
 
         return NULL;
     }
+}
 
 int main (int argc, char *argv [])
 {