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-rw-r--r--src/ctx.cpp300
1 files changed, 158 insertions, 142 deletions
diff --git a/src/ctx.cpp b/src/ctx.cpp
index 397f692..f6e62a7 100644
--- a/src/ctx.cpp
+++ b/src/ctx.cpp
@@ -20,11 +20,8 @@
#include <new>
#include <string.h>
-#include "../include/zmq.h"
-
#include "ctx.hpp"
#include "socket_base.hpp"
-#include "app_thread.hpp"
#include "io_thread.hpp"
#include "platform.hpp"
#include "err.hpp"
@@ -32,62 +29,60 @@
#if defined ZMQ_HAVE_WINDOWS
#include "windows.h"
+#else
+#include "unistd.h"
#endif
zmq::ctx_t::ctx_t (uint32_t io_threads_) :
- sockets (0),
- terminated (false)
+ no_sockets_notify (false)
{
+ int rc;
+
#ifdef ZMQ_HAVE_WINDOWS
// Intialise Windows sockets. Note that WSAStartup can be called multiple
// times given that WSACleanup will be called for each WSAStartup.
WORD version_requested = MAKEWORD (2, 2);
WSADATA wsa_data;
- int rc = WSAStartup (version_requested, &wsa_data);
+ rc = WSAStartup (version_requested, &wsa_data);
zmq_assert (rc == 0);
zmq_assert (LOBYTE (wsa_data.wVersion) == 2 &&
HIBYTE (wsa_data.wVersion) == 2);
#endif
// Initialise the array of signalers.
- signalers_count = max_app_threads + io_threads_;
- signalers = (signaler_t**) malloc (sizeof (signaler_t*) * signalers_count);
- zmq_assert (signalers);
- memset (signalers, 0, sizeof (signaler_t*) * signalers_count);
+ slot_count = max_sockets + io_threads_;
+ slots = (signaler_t**) malloc (sizeof (signaler_t*) * slot_count);
+ zmq_assert (slots);
// Create I/O thread objects and launch them.
for (uint32_t i = 0; i != io_threads_; i++) {
io_thread_t *io_thread = new (std::nothrow) io_thread_t (this, i);
zmq_assert (io_thread);
io_threads.push_back (io_thread);
- signalers [i] = io_thread->get_signaler ();
+ slots [i] = io_thread->get_signaler ();
io_thread->start ();
}
-}
-int zmq::ctx_t::term ()
-{
- // First send stop command to application threads so that any
- // blocking calls are interrupted.
- for (app_threads_t::size_type i = 0; i != app_threads.size (); i++)
- app_threads [i].app_thread->stop ();
-
- // Then mark context as terminated.
- term_sync.lock ();
- zmq_assert (!terminated);
- terminated = true;
- bool destroy = (sockets == 0);
- term_sync.unlock ();
-
- // If there are no sockets open, destroy the context immediately.
- if (destroy)
- delete this;
+ // In the unused part of the slot array, create a list of empty slots.
+ for (int32_t i = (int32_t) slot_count - 1;
+ i >= (int32_t) io_threads_; i--) {
+ empty_slots.push_back (i);
+ slots [i] = NULL;
+ }
- return 0;
+ // Create the logging infrastructure.
+ log_socket = create_socket (ZMQ_PUB);
+ zmq_assert (log_socket);
+ rc = log_socket->bind ("sys://log");
+ zmq_assert (rc == 0);
}
zmq::ctx_t::~ctx_t ()
{
+ // Check that there are no remaining open or zombie sockets.
+ zmq_assert (sockets.empty ());
+ zmq_assert (zombies.empty ());
+
// Ask I/O threads to terminate. If stop signal wasn't sent to I/O
// thread subsequent invocation of destructor would hang-up.
for (io_threads_t::size_type i = 0; i != io_threads.size (); i++)
@@ -97,18 +92,10 @@ zmq::ctx_t::~ctx_t ()
for (io_threads_t::size_type i = 0; i != io_threads.size (); i++)
delete io_threads [i];
- // Close all application theads, sockets, io_objects etc.
- for (app_threads_t::size_type i = 0; i != app_threads.size (); i++)
- delete app_threads [i].app_thread;
-
- // Deallocate all the orphaned pipes.
- while (!pipes.empty ())
- delete *pipes.begin ();
-
- // Deallocate the array of pointers to signalers. No special work is
+ // Deallocate the array of slot. No special work is
// needed as signalers themselves were deallocated with their
- // corresponding (app_/io_) thread objects.
- free (signalers);
+ // corresponding io_thread/socket objects.
+ free (slots);
#ifdef ZMQ_HAVE_WINDOWS
// On Windows, uninitialise socket layer.
@@ -117,116 +104,129 @@ zmq::ctx_t::~ctx_t ()
#endif
}
-zmq::socket_base_t *zmq::ctx_t::create_socket (int type_)
+int zmq::ctx_t::terminate ()
{
- app_threads_sync.lock ();
-
- // Find whether the calling thread has app_thread_t object associated
- // already. At the same time find an unused app_thread_t so that it can
- // be used if there's no associated object for the calling thread.
- // Check whether thread ID is already assigned. If so, return it.
- app_threads_t::size_type unused = app_threads.size ();
- app_threads_t::size_type current;
- for (current = 0; current != app_threads.size (); current++) {
- if (app_threads [current].associated &&
- thread_t::equal (thread_t::id (), app_threads [current].tid))
- break;
- if (!app_threads [current].associated)
- unused = current;
- }
+ // Close the logging infrastructure.
+ log_sync.lock ();
+ int rc = log_socket->close ();
+ zmq_assert (rc == 0);
+ log_socket = NULL;
+ log_sync.unlock ();
- // If no app_thread_t is associated with the calling thread,
- // associate it with one of the unused app_thread_t objects.
- if (current == app_threads.size ()) {
+ // First send stop command to sockets so that any
+ // blocking calls are interrupted.
+ slot_sync.lock ();
+ for (sockets_t::size_type i = 0; i != sockets.size (); i++)
+ sockets [i]->stop ();
+ if (!sockets.empty ())
+ no_sockets_notify = true;
+ slot_sync.unlock ();
+
+ // Find out whether there are any open sockets to care about.
+ // If there are open sockets, sleep till they are closed. Note that we can
+ // use no_sockets_notify safely out of the critical section as once set
+ // its value is never changed again.
+ if (no_sockets_notify)
+ no_sockets_sync.wait ();
+
+ // Note that the lock won't block anyone here. There's noone else having
+ // open sockets anyway. The only purpose of the lock is to double-check all
+ // the CPU caches have been synchronised.
+ slot_sync.lock ();
+
+ // At this point there should be no active sockets. What we have is a set
+ // of zombies waiting to be dezombified.
+ zmq_assert (sockets.empty ());
+
+ // Get rid of remaining zombie sockets.
+ while (!zombies.empty ()) {
+ dezombify ();
+
+ // Sleep for 1ms not to end up busy-looping in the case the I/O threads
+ // are still busy sending data. We can possibly add a grand poll here
+ // (polling for fds associated with all the zombie sockets), but it's
+ // probably not worth of implementing it.
+#if defined ZMQ_HAVE_WINDOWS
+ Sleep (1);
+#else
+ usleep (1000);
+#endif
+ }
+ slot_sync.unlock ();
- // If all the existing app_threads are already used, create one more.
- if (unused == app_threads.size ()) {
+ // Deallocate the resources.
+ delete this;
- // If max_app_threads limit was reached, return error.
- if (app_threads.size () == max_app_threads) {
- app_threads_sync.unlock ();
- errno = EMTHREAD;
- return NULL;
- }
+ return 0;
+}
- // Create the new application thread proxy object.
- app_thread_info_t info;
- memset (&info, 0, sizeof (info));
- info.associated = false;
- info.app_thread = new (std::nothrow) app_thread_t (this,
- io_threads.size () + app_threads.size ());
- zmq_assert (info.app_thread);
- signalers [io_threads.size () + app_threads.size ()] =
- info.app_thread->get_signaler ();
- app_threads.push_back (info);
- }
+zmq::socket_base_t *zmq::ctx_t::create_socket (int type_)
+{
+ slot_sync.lock ();
- // Incidentally, this works both when there is an unused app_thread
- // and when a new one is created.
- current = unused;
+ // Free the slots, if possible.
+ dezombify ();
- // Associate the selected app_thread with the OS thread.
- app_threads [current].associated = true;
- app_threads [current].tid = thread_t::id ();
+ // If max_sockets limit was reached, return error.
+ if (empty_slots.empty ()) {
+ slot_sync.unlock ();
+ errno = EMFILE;
+ return NULL;
}
- app_thread_t *thread = app_threads [current].app_thread;
- app_threads_sync.unlock ();
+ // Choose a slot for the socket.
+ uint32_t slot = empty_slots.back ();
+ empty_slots.pop_back ();
- socket_base_t *s = thread->create_socket (type_);
- if (!s)
+ // Create the socket and register its signaler.
+ socket_base_t *s = socket_base_t::create (type_, this, slot);
+ if (!s) {
+ empty_slots.push_back (slot);
+ slot_sync.unlock ();
return NULL;
+ }
+ sockets.push_back (s);
+ slots [slot] = s->get_signaler ();
- term_sync.lock ();
- sockets++;
- term_sync.unlock ();
+ slot_sync.unlock ();
return s;
}
-void zmq::ctx_t::destroy_socket ()
+void zmq::ctx_t::zombify_socket (socket_base_t *socket_)
{
- // If zmq_term was already called and there are no more sockets,
- // terminate the whole 0MQ infrastructure.
- term_sync.lock ();
- zmq_assert (sockets > 0);
- sockets--;
- bool destroy = (sockets == 0 && terminated);
- term_sync.unlock ();
-
- if (destroy)
- delete this;
-}
+ // Zombification of socket basically means that its ownership is tranferred
+ // from the application that created it to the context.
-void zmq::ctx_t::no_sockets (app_thread_t *thread_)
-{
- app_threads_sync.lock ();
- app_threads_t::size_type i;
- for (i = 0; i != app_threads.size (); i++)
- if (app_threads [i].app_thread == thread_) {
- app_threads [i].associated = false;
- break;
- }
- zmq_assert (i != app_threads.size ());
- app_threads_sync.unlock ();
-}
+ // Note that the lock provides the memory barrier needed to migrate
+ // zombie-to-be socket from it's native thread to shared data area
+ // synchronised by slot_sync.
+ slot_sync.lock ();
+ sockets.erase (socket_);
+ zombies.push_back (socket_);
-void zmq::ctx_t::send_command (uint32_t destination_,
- const command_t &command_)
-{
- signalers [destination_]->send (command_);
+ // Try to get rid of at least some zombie sockets at this point.
+ dezombify ();
+
+ // If shutdown thread is interested in notification about no more
+ // open sockets, notify it now.
+ if (sockets.empty () && no_sockets_notify)
+ no_sockets_sync.post ();
+
+ slot_sync.unlock ();
}
-bool zmq::ctx_t::recv_command (uint32_t thread_slot_,
- command_t *command_, bool block_)
+void zmq::ctx_t::send_command (uint32_t slot_, const command_t &command_)
{
- return signalers [thread_slot_]->recv (command_, block_);
+ slots [slot_]->send (command_);
}
zmq::io_thread_t *zmq::ctx_t::choose_io_thread (uint64_t affinity_)
{
+ if (io_threads.empty ())
+ return NULL;
+
// Find the I/O thread with minimum load.
- zmq_assert (io_threads.size () > 0);
int min_load = -1;
io_threads_t::size_type result = 0;
for (io_threads_t::size_type i = 0; i != io_threads.size (); i++) {
@@ -242,29 +242,13 @@ zmq::io_thread_t *zmq::ctx_t::choose_io_thread (uint64_t affinity_)
return io_threads [result];
}
-void zmq::ctx_t::register_pipe (class pipe_t *pipe_)
-{
- pipes_sync.lock ();
- bool inserted = pipes.insert (pipe_).second;
- zmq_assert (inserted);
- pipes_sync.unlock ();
-}
-
-void zmq::ctx_t::unregister_pipe (class pipe_t *pipe_)
-{
- pipes_sync.lock ();
- pipes_t::size_type erased = pipes.erase (pipe_);
- zmq_assert (erased == 1);
- pipes_sync.unlock ();
-}
-
int zmq::ctx_t::register_endpoint (const char *addr_,
socket_base_t *socket_)
{
endpoints_sync.lock ();
- bool inserted = endpoints.insert (std::make_pair (std::string (addr_),
- socket_)).second;
+ bool inserted = endpoints.insert (endpoints_t::value_type (
+ std::string (addr_), socket_)).second;
if (!inserted) {
errno = EADDRINUSE;
endpoints_sync.unlock ();
@@ -315,3 +299,35 @@ zmq::socket_base_t *zmq::ctx_t::find_endpoint (const char *addr_)
return endpoint;
}
+void zmq::ctx_t::log (zmq_msg_t *msg_)
+{
+ // At this point we migrate the log socket to the current thread.
+ // We rely on mutex for executing the memory barrier.
+ log_sync.lock ();
+ if (log_socket)
+ log_socket->send (msg_, 0);
+ log_sync.unlock ();
+}
+
+void zmq::ctx_t::dezombify ()
+{
+ // Try to dezombify each zombie in the list. Note that caller is
+ // responsible for calling this method in the slot_sync critical section.
+ for (zombies_t::iterator it = zombies.begin (); it != zombies.end ();) {
+ uint32_t slot = (*it)->get_slot ();
+ if ((*it)->dezombify ()) {
+#if defined _MSC_VER
+
+ // HP implementation of STL requires doing it this way...
+ it = zombies.erase (it);
+#else
+ zombies.erase (it);
+#endif
+ empty_slots.push_back (slot);
+ slots [slot] = NULL;
+ }
+ else
+ it++;
+ }
+}
+
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