metrics have been added

1 files changed, 227 insertions, 0 deletions

diff --git a/contrib/libs/libmysql_r/mysys/kqueue_timers.cc b/contrib/libs/libmysql_r/mysys/kqueue_timers.cc
new file mode 100644
index 0000000000..9945cc9aca
--- /dev/null
+++ b/contrib/libs/libmysql_r/mysys/kqueue_timers.cc
@@ -0,0 +1,227 @@
+/* Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License, version 2.0,
+   as published by the Free Software Foundation.
+
+   This program is also distributed with certain software (including
+   but not limited to OpenSSL) that is licensed under separate terms,
+   as designated in a particular file or component or in included license
+   documentation.  The authors of MySQL hereby grant you an additional
+   permission to link the program and your derivative works with the
+   separately licensed software that they have included with MySQL.
+
+   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, version 2.0, 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 St, Fifth Floor, Boston, MA 02110-1301  USA */
+
+/**
+  @file mysys/kqueue_timers.cc
+*/
+
+#include <errno.h>
+#include <sys/types.h> /* Must be before <sys/event.h> on FreeBSD. */
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+
+#include <sys/event.h>
+
+#include "my_dbug.h"
+#include "my_sys.h"    /* my_message_local */
+#include "my_thread.h" /* my_thread_init, my_thread_end */
+#include "my_timer.h"  /* my_timer_t */
+#include "mysql/psi/mysql_thread.h"
+#include "mysys_err.h"
+#include "mysys_priv.h" /* key_thread_timer_notifier */
+
+/* Kernel event queue file descriptor. */
+static int kq_fd = -1;
+
+/* Timer thread object. */
+static my_thread_handle timer_notify_thread;
+
+/**
+  Timer expiration notification thread.
+
+  @param  arg   Unused.
+*/
+
+static void *timer_notify_thread_func(void *arg MY_ATTRIBUTE((unused))) {
+  my_timer_t *timer;
+  struct kevent kev;
+
+  my_thread_init();
+
+  while (1) {
+    if (kevent(kq_fd, NULL, 0, &kev, 1, NULL) < 0) {
+      if (errno == EINTR)
+        continue;
+      else {
+        my_message_local(ERROR_LEVEL, EE_EXITING_TIMER_NOTIFY_THREAD, errno);
+        break;
+      }
+    }
+
+    if (kev.filter == EVFILT_TIMER) {
+      timer = static_cast<my_timer_t *>(kev.udata);
+      DBUG_ASSERT(timer->id == kev.ident);
+      timer->notify_function(timer);
+    } else if (kev.filter == EVFILT_USER)
+      break;
+  }
+
+  close(kq_fd);
+  my_thread_end();
+
+  return NULL;
+}
+
+/**
+  Create a helper thread to dispatch timer expiration notifications.
+
+  @return On success, 0. On error, -1 is returned.
+*/
+
+static int start_helper_thread(void) {
+  struct kevent kev;
+
+  EV_SET(&kev, 0, EVFILT_USER, EV_ADD, 0, 0, 0);
+
+  if (kevent(kq_fd, &kev, 1, NULL, 0, NULL) < 0) {
+    my_message_local(ERROR_LEVEL, EE_FAILED_TO_CREATE_TIMER, errno);
+    return -1;
+  }
+
+  return mysql_thread_create(key_thread_timer_notifier, &timer_notify_thread,
+                             NULL, timer_notify_thread_func, NULL);
+}
+
+/**
+  Initialize internal components.
+
+  @return On success, 0.
+          On error, -1 is returned, and errno is set to indicate the error.
+*/
+
+int my_timer_initialize(void) {
+  int rc;
+
+  /* Create a file descriptor for event notification. */
+  if ((kq_fd = kqueue()) < 0) {
+    my_message_local(ERROR_LEVEL, EE_FAILED_TO_CREATE_TIMER_QUEUE, errno);
+    return -1;
+  }
+
+  /* Create a helper thread. */
+  if ((rc = start_helper_thread())) {
+    my_message_local(ERROR_LEVEL, EE_FAILED_TO_START_TIMER_NOTIFY_THREAD);
+    close(kq_fd);
+  }
+
+  return rc;
+}
+
+/**
+  Release any resources that were allocated as part of initialization.
+*/
+
+void my_timer_deinitialize(void) {
+  struct kevent kev;
+
+  EV_SET(&kev, 0, EVFILT_USER, 0, NOTE_TRIGGER, 0, 0);
+
+  if (kevent(kq_fd, &kev, 1, NULL, 0, NULL) < 0)
+    my_message_local(ERROR_LEVEL,
+                     EE_FAILED_TO_CREATE_TIMER_NOTIFY_THREAD_INTERRUPT_EVENT,
+                     errno);
+
+  my_thread_join(&timer_notify_thread, NULL);
+}
+
+/**
+  Create a timer object.
+
+  @param  timer   Timer object.
+
+  @return On success, 0.
+          On error, -1 is returned, and errno is set to indicate the error.
+*/
+
+int my_timer_create(my_timer_t *timer) {
+  DBUG_ASSERT(kq_fd >= 0);
+
+  timer->id = (uintptr_t)timer;
+
+  return 0;
+}
+
+/**
+  Set the time until the next expiration of the timer.
+
+  @param  timer   Timer object.
+  @param  time    Amount of time (in milliseconds) before the timer expires.
+
+  @return On success, 0.
+          On error, -1 is returned, and errno is set to indicate the error.
+*/
+
+int my_timer_set(my_timer_t *timer, unsigned long time) {
+  struct kevent kev;
+
+  EV_SET(&kev, timer->id, EVFILT_TIMER, EV_ADD | EV_ONESHOT, 0, time, timer);
+
+  return kevent(kq_fd, &kev, 1, NULL, 0, NULL);
+}
+
+/**
+  Cancel the timer.
+
+  @param  timer   Timer object.
+  @param  state   The state of the timer at the time of cancellation, either
+                  signaled (false) or nonsignaled (true).
+
+  @return On success, 0.
+          On error, -1 is returned, and errno is set to indicate the error.
+*/
+
+int my_timer_cancel(my_timer_t *timer, int *state) {
+  int status;
+  struct kevent kev;
+
+  EV_SET(&kev, timer->id, EVFILT_TIMER, EV_DELETE, 0, 0, NULL);
+
+  status = kevent(kq_fd, &kev, 1, NULL, 0, NULL);
+
+  /*
+    If the event was retrieved from the kqueue (at which point we
+    consider it to be signaled), the timer was automatically deleted.
+  */
+  if (!status)
+    *state = 1;
+  else if (errno == ENOENT) {
+    *state = 0;
+    status = 0;
+  }
+
+  return status;
+}
+
+/**
+  Delete a timer object.
+
+  @param  timer   Timer object.
+*/
+
+void my_timer_delete(my_timer_t *timer) {
+  struct kevent kev;
+
+  EV_SET(&kev, timer->id, EVFILT_TIMER, EV_DELETE, 0, 0, NULL);
+
+  kevent(kq_fd, &kev, 1, NULL, 0, NULL);
+}