jdk8-mips64-public/hotspot: src/share/vm/runtime/task.cpp@b92c45f2bc75

7016023: Enable building ARM and PPC from src/closed repository
Reviewed-by: dholmes, bdelsart

     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

    43 int PeriodicTask::_num_tasks = 0;

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

    45 #ifndef PRODUCT

    46 elapsedTimer PeriodicTask::_timer;

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

    48 int PeriodicTask::_ticks;

    50 void PeriodicTask::print_intervals() {

    51   if (ProfilerCheckIntervals) {

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

    53       int n = _intervalHistogram[i];

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

    55     }

    56   }

    57 }

    58 #endif

    60 void PeriodicTask::real_time_tick(size_t delay_time) {

    61 #ifndef PRODUCT

    62   if (ProfilerCheckIntervals) {

    63     _ticks++;

    64     _timer.stop();

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

    66     _timer.reset();

    67     _timer.start();

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

    69     _intervalHistogram[ms]++;

    70   }

    71 #endif

    72   int orig_num_tasks = _num_tasks;

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

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

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

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

    77       orig_num_tasks = _num_tasks;

    78     }

    79   }

    80 }

    83 PeriodicTask::PeriodicTask(size_t interval_time) :

    84   _counter(0), _interval(interval_time) {

    85   // Sanity check the interval time

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

    87          _interval <= PeriodicTask::max_interval &&

    88          _interval %  PeriodicTask::interval_gran == 0,

    89               "improper PeriodicTask interval time");

    90 }

    92 PeriodicTask::~PeriodicTask() {

    93   if (is_enrolled())

    94     disenroll();

    95 }

    97 bool PeriodicTask::is_enrolled() const {

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

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

   100   return false;

   101 }

   103 void PeriodicTask::enroll() {

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

   106   if (_num_tasks == PeriodicTask::max_tasks)

   107     fatal("Overflow in PeriodicTask table");

   108   _tasks[_num_tasks++] = this;

   109 }

   111 void PeriodicTask::disenroll() {

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

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

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

   116   int index;

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

   118   if (index == _num_tasks) return;

   119   _num_tasks--;

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

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

   122   }

   123 }

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