1 /*

     2  * Copyright (c) 2001, 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  */

    24 

    25 #include "precompiled.hpp"

    26 #include "runtime/thread.inline.hpp"

    27 #include "runtime/threadCritical.hpp"

    28 

    29 // put OS-includes here

    30 # include <pthread.h>

    31 

    32 //

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

    34 //

    35 

    36 static pthread_t             tc_owner = 0;

    37 static pthread_mutex_t       tc_mutex = PTHREAD_MUTEX_INITIALIZER;

    38 static int                   tc_count = 0;

    39 

    40 void ThreadCritical::initialize() {

    41 }

    42 

    43 void ThreadCritical::release() {

    44 }

    45 

    46 ThreadCritical::ThreadCritical() {

    47   pthread_t self = pthread_self();

    48   if (self != tc_owner) {

    49     int ret = pthread_mutex_lock(&tc_mutex);

    50     guarantee(ret == 0, "fatal error with pthread_mutex_lock()");

    51     assert(tc_count == 0, "Lock acquired with illegal reentry count.");

    52     tc_owner = self;

    53   }

    54   tc_count++;

    55 }

    56 

    57 ThreadCritical::~ThreadCritical() {

    58   assert(tc_owner == pthread_self(), "must have correct owner");

    59   assert(tc_count > 0, "must have correct count");

    60 

    61   tc_count--;

    62   if (tc_count == 0) {

    63     tc_owner = 0;

    64     int ret = pthread_mutex_unlock(&tc_mutex);

    65     guarantee(ret == 0, "fatal error with pthread_mutex_unlock()");

    66   }

    67 }