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-rw-r--r--src/event/PollGroupPoll.cxx89
1 files changed, 89 insertions, 0 deletions
diff --git a/src/event/PollGroupPoll.cxx b/src/event/PollGroupPoll.cxx
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+++ b/src/event/PollGroupPoll.cxx
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+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+
+#ifdef USE_POLL
+
+#include "PollGroupPoll.hxx"
+
+#include <assert.h>
+
+PollGroupPoll::PollGroupPoll() { }
+PollGroupPoll::~PollGroupPoll() { }
+
+bool PollGroupPoll::Add(int fd, unsigned events, void *obj)
+{
+ assert(items.find(fd) == items.end());
+
+ const size_t index = poll_events.size();
+ poll_events.resize(index + 1);
+ auto &e = poll_events[index];
+ e.fd = fd;
+ e.events = events;
+ e.revents = 0;
+ auto &item = items[fd];
+ item.index = index;
+ item.obj = obj;
+ return true;
+}
+
+bool PollGroupPoll::Modify(int fd, unsigned events, void *obj)
+{
+ auto item_iter = items.find(fd);
+ assert(item_iter != items.end());
+ auto &item = item_iter->second;
+ item.obj = obj;
+ auto &e = poll_events[item.index];
+ e.events = events;
+ e.revents &= events;
+ return true;
+}
+
+bool PollGroupPoll::Remove(int fd)
+{
+ auto item_iter = items.find(fd);
+ assert(item_iter != items.end());
+ auto &item = item_iter->second;
+ size_t index = item.index;
+ size_t last_index = poll_events.size() - 1;
+ if (index != last_index) {
+ std::swap(poll_events[index], poll_events[last_index]);
+ items[poll_events[index].fd].index = index;
+ }
+ poll_events.pop_back();
+ items.erase(item_iter);
+ return true;
+}
+
+void PollGroupPoll::ReadEvents(PollResultGeneric &result, int timeout_ms)
+{
+ int n = poll(poll_events.empty() ? nullptr : &poll_events[0],
+ poll_events.size(), timeout_ms);
+
+ for (size_t i = 0; n > 0 && i < poll_events.size(); ++i) {
+ const auto &e = poll_events[i];
+ if (e.revents != 0) {
+ result.Add(e.revents, items[e.fd].obj);
+ --n;
+ }
+ }
+}
+
+#endif