jdk8-mips64-public/hotspot: src/share/vm/runtime/task.cpp@f34d701e952e

8003935: Simplify the needed includes for using Thread::current()
Reviewed-by: dholmes, rbackman, coleenp

     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/thread.inline.hpp"

    30 #include "runtime/timer.hpp"

    31 #ifdef TARGET_OS_FAMILY_linux

    32 # include "os_linux.inline.hpp"

    33 #endif

    34 #ifdef TARGET_OS_FAMILY_solaris

    35 # include "os_solaris.inline.hpp"

    36 #endif

    37 #ifdef TARGET_OS_FAMILY_windows

    38 # include "os_windows.inline.hpp"

    39 #endif

    40 #ifdef TARGET_OS_FAMILY_bsd

    41 # include "os_bsd.inline.hpp"

    42 #endif

    44 int PeriodicTask::_num_tasks = 0;

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

    46 #ifndef PRODUCT

    47 elapsedTimer PeriodicTask::_timer;

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

    49 int PeriodicTask::_ticks;

    51 void PeriodicTask::print_intervals() {

    52   if (ProfilerCheckIntervals) {

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

    54       int n = _intervalHistogram[i];

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

    56     }

    57   }

    58 }

    59 #endif

    61 void PeriodicTask::real_time_tick(int delay_time) {

    62 #ifndef PRODUCT

    63   if (ProfilerCheckIntervals) {

    64     _ticks++;

    65     _timer.stop();

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

    67     _timer.reset();

    68     _timer.start();

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

    70     _intervalHistogram[ms]++;

    71   }

    72 #endif

    74   {

    75     MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag);

    76     int orig_num_tasks = _num_tasks;

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

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

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

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

    82         orig_num_tasks = _num_tasks;

    83       }

    84     }

    85   }

    86 }

    88 int PeriodicTask::time_to_wait() {

    89   MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ?

    90                      NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag);

    92   if (_num_tasks == 0) {

    93     return 0; // sleep until shutdown or a task is enrolled

    94   }

    96   int delay = _tasks[0]->time_to_next_interval();

    97   for (int index = 1; index < _num_tasks; index++) {

    98     delay = MIN2(delay, _tasks[index]->time_to_next_interval());

    99   }

   100   return delay;

   101 }

   104 PeriodicTask::PeriodicTask(size_t interval_time) :

   105   _counter(0), _interval((int) interval_time) {

   106   // Sanity check the interval time

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

   108          _interval <= PeriodicTask::max_interval &&

   109          _interval %  PeriodicTask::interval_gran == 0,

   110               "improper PeriodicTask interval time");

   111 }

   113 PeriodicTask::~PeriodicTask() {

   114   disenroll();

   115 }

   117 void PeriodicTask::enroll() {

   118   MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ?

   119                      NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag);

   121   if (_num_tasks == PeriodicTask::max_tasks) {

   122     fatal("Overflow in PeriodicTask table");

   123   }

   124   _tasks[_num_tasks++] = this;

   126   WatcherThread* thread = WatcherThread::watcher_thread();

   127   if (thread) {

   128     thread->unpark();

   129   } else {

   130     WatcherThread::start();

   131   }

   132 }

   134 void PeriodicTask::disenroll() {

   135   MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ?

   136                      NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag);

   138   int index;

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

   140     ;

   142   if (index == _num_tasks) {

   143     return;

   144   }

   146   _num_tasks--;

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

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

   150   }

   151 }

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