Merge pull request #1675 from somdoron/Timers

Problem: no way to schedule timers with zmq_poll or zmq_poller

.gitignore

@@ -117,6 +117,7 @@ test_getsockopt_memset
 test_setsockopt
 test_stream_exceeds_buffer
 test_poller
+test_timers
 tests/test*.log
 tests/test*.trs
 src/platform.hpp*

CMakeLists.txt

@@ -449,6 +449,7 @@ set(cxx-sources
         zmq_utils.cpp
         decoder_allocators.cpp
         socket_poller.cpp
+        timers.cpp
         config.hpp)
 
 set(rc-sources version.rc)

Makefile.am

@@ -179,6 +179,8 @@ src_libzmq_la_SOURCES = \
 	src/tcp_listener.hpp \
 	src/thread.cpp \
 	src/thread.hpp \
+	src/timers.cpp \
+	src/timers.hpp \
 	src/tipc_address.cpp \
 	src/tipc_address.hpp \
 	src/tipc_connecter.cpp \
@@ -376,7 +378,8 @@ test_apps = \
 	tests/test_socketopt_hwm \
 	tests/test_heartbeats \
 	tests/test_stream_exceeds_buffer \
-	tests/test_poller
+	tests/test_poller \
+	tests/test_timers
 
 tests_test_system_SOURCES = tests/test_system.cpp
 tests_test_system_LDADD = src/libzmq.la
@@ -587,6 +590,9 @@ tests_test_stream_exceeds_buffer_LDADD = src/libzmq.la
 tests_test_poller_SOURCES = tests/test_poller.cpp
 tests_test_poller_LDADD = src/libzmq.la
 
+tests_test_timers_SOURCES = tests/test_timers.cpp
+tests_test_timers_LDADD = src/libzmq.la
+
 
 if !ON_MINGW
 if !ON_CYGWIN
@@ -729,4 +735,3 @@ dist-hook:
 
 maintainer-clean-local:
 	-rm -rf $(top_srcdir)/config
-

include/zmq.h

@@ -451,6 +451,21 @@ ZMQ_EXPORT int zmq_poller_modify_fd (void *poller, int fd, short events);
 ZMQ_EXPORT int zmq_poller_remove_fd (void *poller, int fd);
 #endif
 
+/******************************************************************************/
+/*  Scheduling timers                                                         */
+/******************************************************************************/
+
+typedef void (zmq_timer_fn)(int timer_id, void *arg);
+
+ZMQ_EXPORT void *zmq_timers_new ();
+ZMQ_EXPORT int   zmq_timers_close (void *timers);
+ZMQ_EXPORT int   zmq_timers_add (void *timers, size_t interval, zmq_timer_fn handler, void *arg);
+ZMQ_EXPORT int   zmq_timers_cancel (void *timers, int timer_id);
+ZMQ_EXPORT int   zmq_timers_set_interval (void *timers, int timer_id, size_t interval);
+ZMQ_EXPORT int   zmq_timers_reset (void *timers, int timer_id);
+ZMQ_EXPORT long  zmq_timers_timeout (void *timers);
+ZMQ_EXPORT int   zmq_timers_execute (void *timers);
+
 /******************************************************************************/
 /*  Message proxying                                                          */
 /******************************************************************************/
@@ -542,4 +557,3 @@ ZMQ_EXPORT void zmq_threadclose (void* thread);
 #endif
 
 #endif
-

src/timers.cpp

@@ -0,0 +1,169 @@
+/*
+Copyright (c) 2007-2015 Contributors as noted in the AUTHORS file
+
+This file is part of libzmq, the ZeroMQ core engine in C++.
+
+libzmq is free software; you can redistribute it and/or modify it under
+the terms of the GNU Lesser General Public License (LGPL) as published
+by the Free Software Foundation; either version 3 of the License, or
+(at your option) any later version.
+
+As a special exception, the Contributors give you permission to link
+this library with independent modules to produce an executable,
+regardless of the license terms of these independent modules, and to
+copy and distribute the resulting executable under terms of your choice,
+provided that you also meet, for each linked independent module, the
+terms and conditions of the license of that module. An independent
+module is a module which is not derived from or based on this library.
+If you modify this library, you must extend this exception to your
+version of the library.
+
+libzmq is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "timers.hpp"
+#include "err.hpp"
+
+zmq::timers_t::timers_t () :
+tag (0xCAFEDADA),
+next_timer_id (0)
+{
+
+}
+
+zmq::timers_t::~timers_t ()
+{
+    //  Mark the timers as dead
+    tag = 0xdeadbeef;
+}
+
+bool zmq::timers_t::check_tag ()
+{
+    return tag == 0xCAFEDADA;
+}
+
+int zmq::timers_t::add (size_t interval_, timers_timer_fn handler_, void* arg_)
+{
+    uint64_t when = clock.now_ms() + interval_;
+    timer_t timer = {++next_timer_id, interval_, handler_, arg_};
+    timers.insert (timersmap_t::value_type (when, timer));
+
+    return timer.timer_id;
+}
+
+int zmq::timers_t::cancel (int timer_id_)
+{
+    cancelled_timers_t::iterator it = cancelled_timers.find (timer_id_);
+
+    if (it != cancelled_timers.end ()) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    cancelled_timers.insert (timer_id_);
+
+    return 0;
+}
+
+int zmq::timers_t::set_interval (int timer_id_, size_t interval_)
+{
+    for (timersmap_t::iterator it = timers.begin (); it != timers.end (); ++it) {
+        if (it->second.timer_id == timer_id_) {
+            timer_t timer = it->second;
+            timer.interval = interval_;
+            uint64_t when = clock.now_ms() + interval_;
+            timers.erase (it);
+                timers.insert (timersmap_t::value_type (when, timer));
+
+            return 0;
+        }
+    }
+
+    errno = EINVAL;
+    return -1;
+}
+
+int zmq::timers_t::reset (int timer_id_) {
+    for (timersmap_t::iterator it = timers.begin (); it != timers.end (); ++it) {
+        if (it->second.timer_id == timer_id_) {
+            timer_t timer = it->second;
+            uint64_t when = clock.now_ms() + timer.interval;
+            timers.erase (it);
+            timers.insert (timersmap_t::value_type (when, timer));
+
+            return 0;
+        }
+    }
+
+    errno = EINVAL;
+    return -1;
+}
+
+long zmq::timers_t::timeout ()
+{
+    timersmap_t::iterator it = timers.begin ();
+
+    uint64_t now = clock.now_ms();
+
+    while (it != timers.end ()) {
+        cancelled_timers_t::iterator cancelled_it = cancelled_timers.find (it->second.timer_id);
+
+        //  Live timer, lets return the timeout
+        if (cancelled_it == cancelled_timers.end ()) {
+            if (it->first > now)
+            return it->first - now;
+            else
+            return 0;
+        }
+
+        // Let's remove it from the begining of the list
+        timersmap_t::iterator old = it;
+        ++it;
+        timers.erase (old);
+        cancelled_timers.erase (cancelled_it);
+    }
+
+    //  Wait forever as no timers are alive
+    return -1;
+}
+
+int zmq::timers_t::execute ()
+{
+    timersmap_t::iterator it = timers.begin ();
+
+    uint64_t now = clock.now_ms();
+
+    while (it != timers.end ()) {
+        cancelled_timers_t::iterator cancelled_it = cancelled_timers.find (it->second.timer_id);
+
+        //  Dead timer, lets remove it and continue
+        if (cancelled_it != cancelled_timers.end ()) {
+            timersmap_t::iterator old = it;
+            ++it;
+            timers.erase (old);
+            cancelled_timers.erase (cancelled_it);
+            continue;
+        }
+
+        //  Map is ordered, if we have to wait for current timer we can stop.
+        if (it->first > now)
+        break;
+
+        timer_t timer = it->second;
+
+        timer.handler (timer.timer_id, timer.arg);
+
+        timersmap_t::iterator old = it;
+        ++it;
+        timers.erase (old);
+        timers.insert (timersmap_t::value_type (now + timer.interval, timer));
+    }
+
+    return 0;
+}

src/timers.hpp

@@ -0,0 +1,108 @@
+/*
+Copyright (c) 2007-2015 Contributors as noted in the AUTHORS file
+
+This file is part of libzmq, the ZeroMQ core engine in C++.
+
+libzmq is free software; you can redistribute it and/or modify it under
+the terms of the GNU Lesser General Public License (LGPL) as published
+by the Free Software Foundation; either version 3 of the License, or
+(at your option) any later version.
+
+As a special exception, the Contributors give you permission to link
+this library with independent modules to produce an executable,
+regardless of the license terms of these independent modules, and to
+copy and distribute the resulting executable under terms of your choice,
+provided that you also meet, for each linked independent module, the
+terms and conditions of the license of that module. An independent
+module is a module which is not derived from or based on this library.
+If you modify this library, you must extend this exception to your
+version of the library.
+
+libzmq is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_TIMERS_HPP_INCLUDED__
+#define __ZMQ_TIMERS_HPP_INCLUDED__
+
+#include <stddef.h>
+#include <map>
+#include <set>
+
+#include "clock.hpp"
+
+namespace zmq
+{
+    typedef void (timers_timer_fn)(
+        int timer_id, void *arg);
+
+        class timers_t
+        {
+        public:
+            timers_t ();
+            ~timers_t ();
+
+            //  Add timer to the set, timer repeats forever, or until cancel is called.
+            //  Returns a timer_id that is used to cancel the timer.
+            //  Returns -1 if there was an error.
+            int add (size_t interval, timers_timer_fn handler, void* arg);
+
+            //  Set the interval of the timer.
+            //  This method is slow, cancelling exsting and adding a new timer yield better performance.
+            //  Returns 0 on success and -1 on error.
+            int set_interval (int timer_id, size_t interval);
+
+            //  Reset the timer.
+            //  This method is slow, cancelling exsting and adding a new timer yield better performance.
+            //  Returns 0 on success and -1 on error.
+            int reset (int timer_id);
+
+            //  Cancel a timer.
+            //  Returns 0 on success and -1 on error.
+            int cancel (int timer_id);
+
+            //  Returns the time in millisecond until the next timer.
+            //  Returns -1 if no timer is due.
+            long timeout ();
+
+            //  Execute timers.
+            //  Return 0 if all succeed and -1 if error.
+            int execute ();
+
+            //  Return false if object is not a timers class.
+            bool check_tag ();
+
+        private:
+
+            //  Used to check whether the object is a timers class.
+            uint32_t tag;
+
+            int next_timer_id;
+
+            //  Clock instance.
+            clock_t clock;
+
+            typedef struct timer_t {
+                int timer_id;
+                size_t interval;
+                timers_timer_fn *handler;
+                void *arg;
+            } timer_t;
+
+            typedef std::multimap <uint64_t, timer_t> timersmap_t;
+            timersmap_t timers;
+
+            typedef std::set<int> cancelled_timers_t;
+            cancelled_timers_t cancelled_timers;
+
+            timers_t (const timers_t&);
+            const timers_t &operator = (const timers_t&);
+        };
+    }
+
+    #endif

src/zmq.cpp

@@ -77,6 +77,7 @@ struct iovec {
 #include "metadata.hpp"
 #include "signaler.hpp"
 #include "socket_poller.hpp"
+#include "timers.hpp"
 
 #if !defined ZMQ_HAVE_WINDOWS
 #include <unistd.h>
@@ -1175,6 +1176,86 @@ int zmq_poller_wait (void *poller_, zmq_poller_event_t *event, long timeout_)
     return rc;
 }
 
+//  Timers
+
+void *zmq_timers_new ()
+{
+    zmq::timers_t *timers = new (std::nothrow) zmq::timers_t;
+    alloc_assert (timers);
+    return timers;
+}
+
+int zmq_timers_close (void *timers_)
+{
+    if (!timers_ || !((zmq::timers_t*)timers_)->check_tag ()) {
+        errno = EFAULT;
+        return -1;
+    }
+
+    delete ((zmq::timers_t*)timers_);
+    return 0;
+}
+
+int zmq_timers_add (void *timers_, size_t interval_, zmq_timer_fn handler_, void *arg_)
+{
+    if (!timers_ || !((zmq::timers_t*)timers_)->check_tag ()) {
+        errno = EFAULT;
+        return -1;
+    }
+
+    return ((zmq::timers_t*)timers_)->add (interval_, handler_, arg_);
+}
+
+int zmq_timers_cancel (void *timers_, int timer_id_)
+{
+    if (!timers_ || !((zmq::timers_t*)timers_)->check_tag ()) {
+        errno = EFAULT;
+        return -1;
+    }
+
+    return ((zmq::timers_t*)timers_)->cancel (timer_id_);
+}
+
+int zmq_timers_set_interval (void *timers_, int timer_id_, size_t interval_)
+{
+    if (!timers_ || !((zmq::timers_t*)timers_)->check_tag ()) {
+        errno = EFAULT;
+        return -1;
+    }
+
+    return ((zmq::timers_t*)timers_)->set_interval (timer_id_, interval_);
+}
+
+int zmq_timers_reset (void *timers_, int timer_id_)
+{
+    if (!timers_ || !((zmq::timers_t*)timers_)->check_tag ()) {
+        errno = EFAULT;
+        return -1;
+    }
+
+    return ((zmq::timers_t*)timers_)->reset (timer_id_);
+}
+
+long zmq_timers_timeout (void *timers_)
+{
+    if (!timers_ || !((zmq::timers_t*)timers_)->check_tag ()) {
+        errno = EFAULT;
+        return -1;
+    }
+
+    return ((zmq::timers_t*)timers_)->timeout ();
+}
+
+int zmq_timers_execute (void *timers_)
+{
+    if (!timers_ || !((zmq::timers_t*)timers_)->check_tag ()) {
+        errno = EFAULT;
+        return -1;
+    }
+
+    return ((zmq::timers_t*)timers_)->execute ();
+}
+
 //  The proxy functionality
 
 int zmq_proxy (void *frontend_, void *backend_, void *capture_)

tests/CMakeLists.txt

@@ -69,6 +69,7 @@ set(tests
         test_sub_forward_tipc
         test_xpub_manual
         test_xpub_welcome_msg
+        test_timers
 )
 if(NOT WIN32)
   list(APPEND tests

tests/test_timers.cpp

@@ -0,0 +1,126 @@
+/*
+    Copyright (c) 2007-2015 Contributors as noted in the AUTHORS file
+
+    This file is part of libzmq, the ZeroMQ core engine in C++.
+
+    libzmq is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License (LGPL) as published
+    by the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    As a special exception, the Contributors give you permission to link
+    this library with independent modules to produce an executable,
+    regardless of the license terms of these independent modules, and to
+    copy and distribute the resulting executable under terms of your choice,
+    provided that you also meet, for each linked independent module, the
+    terms and conditions of the license of that module. An independent
+    module is a module which is not derived from or based on this library.
+    If you modify this library, you must extend this exception to your
+    version of the library.
+
+    libzmq is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "testutil.hpp"
+#include "../include/zmq_utils.h"
+
+#if defined ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#else
+#include <unistd.h>
+#endif
+
+void _sleep (long timeout_)
+{
+#if defined ZMQ_HAVE_WINDOWS
+    Sleep (timeout_ > 0 ? timeout_ : INFINITE);
+#elif defined ZMQ_HAVE_ANDROID
+    usleep (timeout_ * 1000);
+#else
+    usleep (timeout_ * 1000);
+#endif
+}
+
+void handler (int timer_id, void* arg)
+{
+    *((bool *)arg) = true;
+}
+
+int main (void)
+{
+    setup_test_environment ();
+
+    void* timers = zmq_timers_new ();
+    assert (timers);
+
+    bool timer_invoked = false;
+
+    int timer_id = zmq_timers_add (timers, 100, handler, &timer_invoked);
+    assert (timer_id);
+
+    //  Timer should be invoked yet
+    int rc = zmq_timers_execute (timers);
+    assert (rc == 0);
+    assert (!timer_invoked);
+
+    //  Wait half the time and check again
+    _sleep (zmq_timers_timeout (timers) / 2);
+    rc = zmq_timers_execute (timers);
+    assert (rc == 0);
+    assert (!timer_invoked);
+
+    // Wait until the end
+    _sleep (zmq_timers_timeout (timers));
+    rc = zmq_timers_execute (timers);
+    assert (rc == 0);
+    assert (timer_invoked);
+    timer_invoked = false;
+
+    //  Wait half the time and check again
+    long timeout = zmq_timers_timeout (timers);
+    _sleep (timeout / 2);
+    rc = zmq_timers_execute (timers);
+    assert (rc == 0);
+    assert (!timer_invoked);
+
+    // Reset timer and wait half of the time left
+    rc = zmq_timers_reset (timers, timer_id);
+    _sleep (timeout / 2);
+    rc = zmq_timers_execute (timers);
+    assert (rc == 0);
+    assert (!timer_invoked);
+
+    // Wait until the end
+    _sleep (zmq_timers_timeout (timers));
+    rc = zmq_timers_execute (timers);
+    assert (rc == 0);
+    assert (timer_invoked);
+    timer_invoked = false;
+
+    // reschedule
+    zmq_timers_set_interval (timers, timer_id, 50);
+    _sleep (51);
+    rc = zmq_timers_execute (timers);
+    assert (rc == 0);
+    assert (timer_invoked);
+    timer_invoked = false;
+
+    // cancel timer
+    timeout = zmq_timers_timeout (timers);
+    zmq_timers_cancel (timers, timer_id);
+    _sleep (timeout * 2);
+    rc = zmq_timers_execute (timers);
+    assert (rc == 0);
+    assert (!timer_invoked);
+
+    rc = zmq_timers_close (timers);
+    assert (rc == 0);
+
+    return 0;
+}