initial code repo

[stor4nfv.git] / src / ceph / src / msg / async / EventEpoll.cc

diff --git a/src/ceph/src/msg/async/EventEpoll.cc b/src/ceph/src/msg/async/EventEpoll.cc
new file mode 100644 (file)
index 0000000..17f3a29
--- /dev/null
+++ b/src/ceph/src/msg/async/EventEpoll.cc
@@ -0,0 +1,133 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2014 UnitedStack <haomai@unitedstack.com>
+ *
+ * Author: Haomai Wang <haomaiwang@gmail.com>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#include "common/errno.h"
+#include "EventEpoll.h"
+
+#define dout_subsys ceph_subsys_ms
+
+#undef dout_prefix
+#define dout_prefix *_dout << "EpollDriver."
+
+int EpollDriver::init(EventCenter *c, int nevent)
+{
+  events = (struct epoll_event*)malloc(sizeof(struct epoll_event)*nevent);
+  if (!events) {
+    lderr(cct) << __func__ << " unable to malloc memory. " << dendl;
+    return -ENOMEM;
+  }
+  memset(events, 0, sizeof(struct epoll_event)*nevent);
+
+  epfd = epoll_create(1024); /* 1024 is just an hint for the kernel */
+  if (epfd == -1) {
+    lderr(cct) << __func__ << " unable to do epoll_create: "
+                       << cpp_strerror(errno) << dendl;
+    return -errno;
+  }
+
+  size = nevent;
+
+  return 0;
+}
+
+int EpollDriver::add_event(int fd, int cur_mask, int add_mask)
+{
+  ldout(cct, 20) << __func__ << " add event fd=" << fd << " cur_mask=" << cur_mask
+                 << " add_mask=" << add_mask << " to " << epfd << dendl;
+  struct epoll_event ee;
+  /* If the fd was already monitored for some event, we need a MOD
+   * operation. Otherwise we need an ADD operation. */
+  int op;
+  op = cur_mask == EVENT_NONE ? EPOLL_CTL_ADD: EPOLL_CTL_MOD;
+
+  ee.events = EPOLLET;
+  add_mask |= cur_mask; /* Merge old events */
+  if (add_mask & EVENT_READABLE)
+    ee.events |= EPOLLIN;
+  if (add_mask & EVENT_WRITABLE)
+    ee.events |= EPOLLOUT;
+  ee.data.u64 = 0; /* avoid valgrind warning */
+  ee.data.fd = fd;
+  if (epoll_ctl(epfd, op, fd, &ee) == -1) {
+    lderr(cct) << __func__ << " epoll_ctl: add fd=" << fd << " failed. "
+               << cpp_strerror(errno) << dendl;
+    return -errno;
+  }
+
+  return 0;
+}
+
+int EpollDriver::del_event(int fd, int cur_mask, int delmask)
+{
+  ldout(cct, 20) << __func__ << " del event fd=" << fd << " cur_mask=" << cur_mask
+                 << " delmask=" << delmask << " to " << epfd << dendl;
+  struct epoll_event ee;
+  int mask = cur_mask & (~delmask);
+  int r = 0;
+
+  ee.events = 0;
+  if (mask & EVENT_READABLE) ee.events |= EPOLLIN;
+  if (mask & EVENT_WRITABLE) ee.events |= EPOLLOUT;
+  ee.data.u64 = 0; /* avoid valgrind warning */
+  ee.data.fd = fd;
+  if (mask != EVENT_NONE) {
+    if ((r = epoll_ctl(epfd, EPOLL_CTL_MOD, fd, &ee)) < 0) {
+      lderr(cct) << __func__ << " epoll_ctl: modify fd=" << fd << " mask=" << mask
+                 << " failed." << cpp_strerror(errno) << dendl;
+      return -errno;
+    }
+  } else {
+    /* Note, Kernel < 2.6.9 requires a non null event pointer even for
+     * EPOLL_CTL_DEL. */
+    if ((r = epoll_ctl(epfd, EPOLL_CTL_DEL, fd, &ee)) < 0) {
+      lderr(cct) << __func__ << " epoll_ctl: delete fd=" << fd
+                 << " failed." << cpp_strerror(errno) << dendl;
+      return -errno;
+    }
+  }
+  return 0;
+}
+
+int EpollDriver::resize_events(int newsize)
+{
+  return 0;
+}
+
+int EpollDriver::event_wait(vector<FiredFileEvent> &fired_events, struct timeval *tvp)
+{
+  int retval, numevents = 0;
+
+  retval = epoll_wait(epfd, events, size,
+                      tvp ? (tvp->tv_sec*1000 + tvp->tv_usec/1000) : -1);
+  if (retval > 0) {
+    int j;
+
+    numevents = retval;
+    fired_events.resize(numevents);
+    for (j = 0; j < numevents; j++) {
+      int mask = 0;
+      struct epoll_event *e = events + j;
+
+      if (e->events & EPOLLIN) mask |= EVENT_READABLE;
+      if (e->events & EPOLLOUT) mask |= EVENT_WRITABLE;
+      if (e->events & EPOLLERR) mask |= EVENT_READABLE|EVENT_WRITABLE;
+      if (e->events & EPOLLHUP) mask |= EVENT_READABLE|EVENT_WRITABLE;
+      fired_events[j].fd = e->data.fd;
+      fired_events[j].mask = mask;
+    }
+  }
+  return numevents;
+}