jdk8-mips64-public/hotspot: src/os/solaris/vm/threadCritical

6784100: getTimeNanos - CAS reduction
Summary: Get rid of the CAS loop in getTimeNanos to reduce coherence traffic on Solaris.
Reviewed-by: acorn, kvn, ysr

     1 /*

     2  * Copyright 2001-2003 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 #include "incls/_precompiled.incl"

    26 #include "incls/_threadCritical_solaris.cpp.incl"

    28 // OS-includes here

    29 #include <thread.h>

    30 #include <synch.h>

    32 //

    33 // See threadCritical.hpp for details of this class.

    34 //

    35 // For some reason, we don't do locking until the

    36 // os::init() call completes. I'm not sure why this

    37 // is, and have left it that way for now. This should

    38 // be reviewed later.

    40 static  mutex_t  global_mut;

    41 static  thread_t global_mut_owner = -1;

    42 static  int      global_mut_count = 0;

    43 static  bool     initialized = false;

    45 ThreadCritical::ThreadCritical() {

    46   if (initialized) {

    47     thread_t owner = thr_self();

    48     if (global_mut_owner != owner) {

    49       if (os::Solaris::mutex_lock(&global_mut))

    50         fatal1("ThreadCritical::ThreadCritical: mutex_lock failed (%s)", strerror(errno));

    51       assert(global_mut_count == 0, "must have clean count");

    52       assert(global_mut_owner == -1, "must have clean owner");

    53     }

    54     global_mut_owner = owner;

    55     ++global_mut_count;

    56   } else {

    57     assert (Threads::number_of_threads() == 0, "valid only during initialization");

    58   }

    59 }

    61 ThreadCritical::~ThreadCritical() {

    62   if (initialized) {

    63     assert(global_mut_owner == thr_self(), "must have correct owner");

    64     assert(global_mut_count > 0, "must have correct count");

    65     --global_mut_count;

    66     if (global_mut_count == 0) {

    67       global_mut_owner = -1;

    68       if (os::Solaris::mutex_unlock(&global_mut))

    69         fatal1("ThreadCritical::~ThreadCritical: mutex_unlock failed (%s)", strerror(errno));

    70     }

    71   } else {

    72     assert (Threads::number_of_threads() == 0, "valid only during initialization");

    73   }

    74 }

    76 void ThreadCritical::initialize() {

    77   // This method is called at the end of os::init(). Until

    78   // then, we don't do real locking.

    79   initialized = true;

    80 }

    82 void ThreadCritical::release() {

    83 }

src/os/solaris/vm/threadCritical_solaris.cpp@8a25d96bcf08

src/os/solaris/vm/threadCritical_solaris.cpp

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

src/os/solaris/vm/threadCritical_solaris.cpp@8a25d96bcf08

src/os/solaris/vm/threadCritical_solaris.cpp