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 }