jdk8-mips64-public/hotspot: src/share/vm/runtime/threadCritical.hpp@6deeaebad47a

6902182: 4/4 Starting with jdwp agent should not incur performance penalty
Summary: Rename can_post_exceptions support to can_post_on_exceptions. Add support for should_post_on_exceptions flag to permit per JavaThread optimizations.
Reviewed-by: never, kvn, dcubed
Contributed-by: tom.deneau@amd.com

     1 /*

     2  * Copyright 2001-2002 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 // ThreadCritical is used to protect short non-blocking critical sections.

    26 // This class must use no vm facilities that require initialization.

    27 // It is used very early in the vm's initialization, in allocation

    28 // code and other areas. ThreadCritical regions are reentrant.

    29 //

    30 // Due to race conditions during vm exit, some of the os level

    31 // synchronization primitives may not be deallocated at exit. It

    32 // is a good plan to implement the platform dependent sections of

    33 // code with resources that are recoverable during process

    34 // cleanup by the os. Calling the initialize method before use

    35 // is also problematic, it is best to use preinitialized primitives

    36 // if possible. As an example:

    37 //

    38 // mutex_t  mp  =  DEFAULTMUTEX;

    39 //

    40 // Also note that this class is declared as a StackObj to enforce

    41 // block structured short locks. It cannot be declared a ResourceObj

    42 // or CHeapObj, due to initialization issues.

    44 class ThreadCritical : public StackObj {

    45  friend class os;

    46  private:

    47   static void initialize();

    48   static void release();

    50  public:

    51   ThreadCritical();

    52   ~ThreadCritical();

    53 };

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

src/share/vm/runtime/threadCritical.hpp@6deeaebad47a

src/share/vm/runtime/threadCritical.hpp