ZMQ_POLL option forces fd_signaler to be used in app_thread

src/app_thread.cpp

@@ -31,6 +31,8 @@
 
 #include "app_thread.hpp"
 #include "dispatcher.hpp"
+#include "fd_signaler.hpp"
+#include "ypollset.hpp"
 #include "err.hpp"
 #include "pipe.hpp"
 #include "config.hpp"
@@ -52,16 +54,26 @@ zmq::app_thread_t::app_thread_t (dispatcher_t *dispatcher_, int thread_slot_,
     associated (false),
     last_processing_time (0)
 {
+    if (flags_ & ZMQ_POLL) {
+        signaler = new fd_signaler_t;
+        zmq_assert (signaler);
+    }
+    else {
+        signaler = new ypollset_t;
+        zmq_assert (signaler);
+    }
 }
 
 zmq::app_thread_t::~app_thread_t ()
 {
     zmq_assert (sockets.empty ());
+    zmq_assert (signaler);
+    delete signaler;
 }
 
 zmq::i_signaler *zmq::app_thread_t::get_signaler ()
 {
-    return &pollset;
+    return signaler;
 }
 
 bool zmq::app_thread_t::is_current ()
@@ -86,7 +98,7 @@ void zmq::app_thread_t::process_commands (bool block_, bool throttle_)
 {
     uint64_t signals;
     if (block_)
-        signals = pollset.poll ();
+        signals = signaler->poll ();
     else {
 
 #if defined ZMQ_DELAY_COMMANDS
@@ -119,7 +131,7 @@ void zmq::app_thread_t::process_commands (bool block_, bool throttle_)
 #endif
 
         //  Check whether there are any commands pending for this thread.
-        signals = pollset.check ();
+        signals = signaler->check ();
     }
 
     if (signals) {

src/app_thread.hpp

@@ -24,7 +24,6 @@
 
 #include "stdint.hpp"
 #include "object.hpp"
-#include "ypollset.hpp"
 #include "thread.hpp"
 
 namespace zmq
@@ -40,7 +39,7 @@ namespace zmq
         ~app_thread_t ();
 
         //  Returns signaler associated with this application thread.
-        i_signaler *get_signaler ();
+        struct i_signaler *get_signaler ();
 
         //  Nota bene: Following two functions are accessed from different
         //  threads. The caller (dispatcher) is responsible for synchronisation
@@ -79,7 +78,7 @@ namespace zmq
         thread_t::id_t tid;
 
         //  App thread's signaler object.
-        ypollset_t pollset;
+        struct i_signaler *signaler;
 
         //  Timestamp of when commands were processed the last time.
         uint64_t last_processing_time;

src/fd_signaler.cpp

@@ -65,12 +65,18 @@ void zmq::fd_signaler_t::signal (int signal_)
     errno_assert (sz == sizeof (uint64_t));
 }
 
+uint64_t zmq::fd_signaler_t::poll ()
+{
+    //  TODO: Can we do a blocking read on non-blocking eventfd?
+    //  It's not needed as for now, so let it stay unimplemented.
+    zmq_assert (false);
+}
+
 uint64_t zmq::fd_signaler_t::check ()
 {
     uint64_t val;
     ssize_t sz = read (fd, &val, sizeof (uint64_t));
-    if (sz == -1 && (errno == EAGAIN || errno == EWOULDBLOCK ||
-          errno == EINTR))
+    if (sz == -1 && (errno == EAGAIN || errno == EINTR))
         return 0;
     errno_assert (sz != -1);
     return val;
@@ -120,7 +126,7 @@ zmq::fd_signaler_t::fd_signaler_t ()
     rc = connect (w, (sockaddr *) &addr, sizeof (addr));
     wsa_assert (rc != SOCKET_ERROR);
                                     
-    //  Accept connection from w
+    //  Accept connection from w.
     r = accept (listener, NULL, NULL);
     wsa_assert (r != INVALID_SOCKET);
             
@@ -139,6 +145,9 @@ zmq::fd_signaler_t::~fd_signaler_t ()
 
 void zmq::fd_signaler_t::signal (int signal_)
 {
+    //  TODO: Note that send is a blocking operation.
+    //  How should we behave if the signal cannot be written to the signaler?
+
     zmq_assert (signal_ >= 0 && signal_ < 64);
     char c = (char) signal_;
     int rc = send (w, &c, 1, 0);
@@ -154,7 +163,7 @@ uint64_t zmq::fd_signaler_t::poll ()
 
     //  If there are no signals, wait until at least one signal arrives.
     unsigned char sig;
-    int nbytes = recv (r, (char*) &sig, 1, MSG_WAITALL);
+    int nbytes = recv (r, (char*) &sig, 1, 0);
     win_assert (nbytes != -1);
     return uint64_t (1) << sig;
 }
@@ -162,7 +171,9 @@ uint64_t zmq::fd_signaler_t::poll ()
 uint64_t zmq::fd_signaler_t::check ()
 {
     unsigned char buffer [32];      
-    int nbytes = recv (r, (char*) buffer, 32, 0);
+    int nbytes = recv (r, (char*) buffer, 32, MSG_DONTWAIT);
+    if (nbytes == -1 && errno == EAGAIN)
+        return 0;
     win_assert (nbytes != -1);
 
     uint64_t signals = 0;
@@ -190,13 +201,6 @@ zmq::fd_signaler_t::fd_signaler_t ()
     errno_assert (rc == 0);
     w = sv [0];
     r = sv [1];
-                      
-    //  Set to non-blocking mode.
-    int flags = fcntl (r, F_GETFL, 0);
-    if (flags == -1)
-        flags = 0;
-    rc = fcntl (r, F_SETFL, flags | O_NONBLOCK);
-    errno_assert (rc != -1);
 }
 
 zmq::fd_signaler_t::~fd_signaler_t ()
@@ -207,6 +211,9 @@ zmq::fd_signaler_t::~fd_signaler_t ()
 
 void zmq::fd_signaler_t::signal (int signal_)
 {
+    //  TODO: Note that send is a blocking operation.
+    //  How should we behave if the signal cannot be written to the signaler?
+
     zmq_assert (signal_ >= 0 && signal_ < 64);
     unsigned char c = (unsigned char) signal_;
     ssize_t nbytes = send (w, &c, 1, 0);
@@ -222,7 +229,7 @@ uint64_t zmq::fd_signaler_t::poll ()
 
     //  If there are no signals, wait until at least one signal arrives.
     unsigned char sig;
-    ssize_t nbytes = recv (r, &sig, 1, MSG_WAITALL);
+    ssize_t nbytes = recv (r, &sig, 1, 0);
     errno_assert (nbytes != -1);
     return uint64_t (1) << sig;
 }
@@ -230,8 +237,10 @@ uint64_t zmq::fd_signaler_t::poll ()
 uint64_t zmq::fd_signaler_t::check ()
 {
     unsigned char buffer [32];
-    ssize_t nbytes = recv (r, buffer, 32, 0);
-    errno_assert (nbytes != -1);
+    ssize_t nbytes = recv (r, buffer, 32, MSG_DONTWAIT);
+    if (nbytes == -1 && errno == EAGAIN)
+        return 0;
+    zmq_assert (nbytes != -1);
 
     uint64_t signals = 0;
     for (int pos = 0; pos != nbytes; pos ++) {

src/fd_signaler.hpp

@@ -37,10 +37,7 @@ namespace zmq
     {
     public:
 
-        //  Initialise the object.
         fd_signaler_t ();
-
-        //  Destroy the object.
         ~fd_signaler_t ();
 
         //  i_signaler interface implementation.

src/i_signaler.hpp

@@ -37,11 +37,11 @@ namespace zmq
         //  Wait for signal. Returns a set of signals in form of a bitmap.
         //  Signal with index 0 corresponds to value 1, index 1 to value 2,
         //  index 2 to value 3 etc.
-        uint64_t poll ();
+        virtual uint64_t poll () = 0;
 
         //  Same as poll, however, if there is no signal available,
         //  function returns zero immediately instead of waiting for a signal.
-        uint64_t check ();
+        virtual uint64_t check () = 0;
     };
 
 }

src/ypollset.cpp

@@ -23,6 +23,10 @@ zmq::ypollset_t::ypollset_t ()
 {
 }
 
+zmq::ypollset_t::~ypollset_t ()
+{
+}
+
 void zmq::ypollset_t::signal (int signal_)
 {
     zmq_assert (signal_ >= 0 && signal_ < wait_signal);

src/ypollset.hpp

@@ -35,8 +35,8 @@ namespace zmq
     {
     public:
 
-        //  Create the pollset.
         ypollset_t ();
+        ~ypollset_t ();
 
         //  i_signaler interface implementation.
         void signal (int signal_);