1 /*
   2  * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright (c) 2012, 2014 SAP SE. All rights reserved.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 #include "precompiled.hpp"
  27 #include "runtime/threadCritical.hpp"
  28 #include "runtime/thread.inline.hpp"
  29 
  30 // put OS-includes here
  31 # include <pthread.h>
  32 
  33 //
  34 // See threadCritical.hpp for details of this class.
  35 //
  36 
  37 static pthread_t             tc_owner = 0;
  38 static pthread_mutex_t       tc_mutex = PTHREAD_MUTEX_INITIALIZER;
  39 static int                   tc_count = 0;
  40 
  41 void ThreadCritical::initialize() {
  42 }
  43 
  44 void ThreadCritical::release() {
  45 }
  46 
  47 ThreadCritical::ThreadCritical() {
  48   pthread_t self = pthread_self();
  49   if (self != tc_owner) {
  50     int ret = pthread_mutex_lock(&tc_mutex);
  51     guarantee(ret == 0, "fatal error with pthread_mutex_lock()");
  52     assert(tc_count == 0, "Lock acquired with illegal reentry count.");
  53     tc_owner = self;
  54   }
  55   tc_count++;
  56 }
  57 
  58 ThreadCritical::~ThreadCritical() {
  59   assert(tc_owner == pthread_self(), "must have correct owner");
  60   assert(tc_count > 0, "must have correct count");
  61 
  62   tc_count--;
  63   if (tc_count == 0) {
  64     tc_owner = 0;
  65     int ret = pthread_mutex_unlock(&tc_mutex);
  66     guarantee(ret == 0, "fatal error with pthread_mutex_unlock()");
  67   }
  68 }