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/* |
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* This file is part of Deliantra, the Roguelike Realtime MMORPG. |
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* |
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* Copyright (©) 2017,2018 Marc Alexander Lehmann / the Deliantra team |
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* Copyright (©) 2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
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* |
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* Deliantra is free software: you can redistribute it and/or modify it under |
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* the terms of the Affero GNU General Public License as published by the |
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* Free Software Foundation, either version 3 of the License, or (at your |
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* option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the Affero GNU General Public License |
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* and the GNU General Public License along with this program. If not, see |
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* <http://www.gnu.org/licenses/>. |
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* |
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* The authors can be reached via e-mail to <support@deliantra.net> |
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*/ |
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|
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#include "global.h" |
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#include "evthread.h" |
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#include "cfperl.h" |
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|
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thread evthread; |
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static ev_loop *loop; |
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|
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///////////////////////////////////////////////////////////////////////////// |
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|
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ev_async tick_watcher; |
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EV_ATOMIC_T coroapi::cede_pending; |
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|
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static ev_periodic cede_watcher; |
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|
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// it is a bit silly to have to use a mutex, but contention |
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// is basically non-existant, favouring good mutex implementations. |
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static SMUTEX (evthread_mutex); |
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static NV next_tick; |
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|
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NV get_next_tick () |
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{ |
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SMUTEX_LOCK (evthread_mutex); |
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NV retval = next_tick; |
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SMUTEX_UNLOCK (evthread_mutex); |
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return retval; |
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} |
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|
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static void |
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cede_cb (EV_P_ ev_periodic *w, int revents) |
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{ |
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SMUTEX_LOCK (evthread_mutex); |
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next_tick = w->at; |
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SMUTEX_UNLOCK (evthread_mutex); |
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|
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coroapi::cede_pending = 1; |
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|
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ev_async_send (EV_DEFAULT_UC, &tick_watcher); |
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} |
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|
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static void |
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tick_cb (EV_P_ ev_async *w, int revents) |
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{ |
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cfperl_tick (); |
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} |
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|
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///////////////////////////////////////////////////////////////////////////// |
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|
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static SMUTEX(cb_mutex); |
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static SCOND(cb_done); |
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|
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static ev_async async_watcher; |
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static ev_io aio_watcher; |
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|
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static void |
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async_cb (EV_P_ ev_async *w, int revents) |
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{ |
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CALL_BEGIN (0); |
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CALL_CALL ("IO::AIO::poll_cb", G_SCALAR); |
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IV reqs = POPi; |
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CALL_END; |
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|
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SMUTEX_LOCK (cb_mutex); |
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SCOND_SIGNAL (cb_done); |
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SMUTEX_UNLOCK (cb_mutex); |
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} |
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|
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static void |
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aio_cb (EV_P_ ev_io *w, int revents) |
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{ |
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ev_async_send (EV_DEFAULT_UC, &async_watcher); |
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|
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coroapi::cede_pending = 1; // to decrease latency |
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|
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SCOND_WAIT (cb_done, cb_mutex); |
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} |
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|
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///////////////////////////////////////////////////////////////////////////// |
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|
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static void * |
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evthread_proc (void *arg) |
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{ |
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SMUTEX_LOCK (cb_mutex); |
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|
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ev_run (loop, 0); |
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|
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return 0; |
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} |
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|
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void evthread_start (int aiofd) |
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{ |
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I_EV_API ("evthread"); |
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|
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// main loop |
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ev_async_init (&tick_watcher, tick_cb); |
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ev_set_priority (&tick_watcher, 1); |
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ev_async_start (EV_DEFAULT_UC, &tick_watcher); |
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|
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ev_async_init (&async_watcher, async_cb); |
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ev_set_priority (&async_watcher, 1); |
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ev_async_start (EV_DEFAULT_UC, &async_watcher); |
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|
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// secondary loop, we use select/poll as epoll has very |
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// bad timing characteristics and we only watch a single low fd. |
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loop = ev_loop_new (EVBACKEND_SELECT); |
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|
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ev_periodic_init (&cede_watcher, cede_cb, 0, TICK, 0); |
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ev_periodic_start (loop, &cede_watcher); |
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|
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ev_io_init (&aio_watcher, aio_cb, aiofd, EV_READ); |
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ev_io_start (loop, &aio_watcher); |
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|
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evthread.start (evthread_proc); |
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} |
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|
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