jdk8-mips64-public/hotspot: src/share/vm/runtime/task.cpp@0a10d80352d5

     1 /*

     2  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #include "precompiled.hpp"

    26 #include "memory/allocation.hpp"

    27 #include "runtime/init.hpp"

    28 #include "runtime/task.hpp"

    29 #include "runtime/timer.hpp"

    30 #ifdef TARGET_OS_FAMILY_linux

    31 # include "os_linux.inline.hpp"

    32 # include "thread_linux.inline.hpp"

    33 #endif

    34 #ifdef TARGET_OS_FAMILY_solaris

    35 # include "os_solaris.inline.hpp"

    36 # include "thread_solaris.inline.hpp"

    37 #endif

    38 #ifdef TARGET_OS_FAMILY_windows

    39 # include "os_windows.inline.hpp"

    40 # include "thread_windows.inline.hpp"

    41 #endif

    42 #ifdef TARGET_OS_FAMILY_bsd

    43 # include "os_bsd.inline.hpp"

    44 # include "thread_bsd.inline.hpp"

    45 #endif

    47 int PeriodicTask::_num_tasks = 0;

    48 PeriodicTask* PeriodicTask::_tasks[PeriodicTask::max_tasks];

    49 #ifndef PRODUCT

    50 elapsedTimer PeriodicTask::_timer;

    51 int PeriodicTask::_intervalHistogram[PeriodicTask::max_interval];

    52 int PeriodicTask::_ticks;

    54 void PeriodicTask::print_intervals() {

    55   if (ProfilerCheckIntervals) {

    56     for (int i = 0; i < PeriodicTask::max_interval; i++) {

    57       int n = _intervalHistogram[i];

    58       if (n > 0) tty->print_cr("%3d: %5d (%4.1f%%)", i, n, 100.0 * n / _ticks);

    59     }

    60   }

    61 }

    62 #endif

    64 void PeriodicTask::real_time_tick(size_t delay_time) {

    65 #ifndef PRODUCT

    66   if (ProfilerCheckIntervals) {

    67     _ticks++;

    68     _timer.stop();

    69     int ms = (int)(_timer.seconds() * 1000.0);

    70     _timer.reset();

    71     _timer.start();

    72     if (ms >= PeriodicTask::max_interval) ms = PeriodicTask::max_interval - 1;

    73     _intervalHistogram[ms]++;

    74   }

    75 #endif

    76   int orig_num_tasks = _num_tasks;

    77   for(int index = 0; index < _num_tasks; index++) {

    78     _tasks[index]->execute_if_pending(delay_time);

    79     if (_num_tasks < orig_num_tasks) { // task dis-enrolled itself

    80       index--;  // re-do current slot as it has changed

    81       orig_num_tasks = _num_tasks;

    82     }

    83   }

    84 }

    87 PeriodicTask::PeriodicTask(size_t interval_time) :

    88   _counter(0), _interval(interval_time) {

    89   // Sanity check the interval time

    90   assert(_interval >= PeriodicTask::min_interval &&

    91          _interval <= PeriodicTask::max_interval &&

    92          _interval %  PeriodicTask::interval_gran == 0,

    93               "improper PeriodicTask interval time");

    94 }

    96 PeriodicTask::~PeriodicTask() {

    97   if (is_enrolled())

    98     disenroll();

    99 }

   101 bool PeriodicTask::is_enrolled() const {

   102   for(int index = 0; index < _num_tasks; index++)

   103     if (_tasks[index] == this) return true;

   104   return false;

   105 }

   107 void PeriodicTask::enroll() {

   108   assert(WatcherThread::watcher_thread() == NULL, "dynamic enrollment of tasks not yet supported");

   110   if (_num_tasks == PeriodicTask::max_tasks)

   111     fatal("Overflow in PeriodicTask table");

   112   _tasks[_num_tasks++] = this;

   113 }

   115 void PeriodicTask::disenroll() {

   116   assert(WatcherThread::watcher_thread() == NULL ||

   117          Thread::current() == WatcherThread::watcher_thread(),

   118          "dynamic disenrollment currently only handled from WatcherThread from within task() method");

   120   int index;

   121   for(index = 0; index < _num_tasks && _tasks[index] != this; index++);

   122   if (index == _num_tasks) return;

   123   _num_tasks--;

   124   for (; index < _num_tasks; index++) {

   125     _tasks[index] = _tasks[index+1];

   126   }

   127 }

Mercurial > jdk8-mips64-public > hotspot / file revision