1 /*
   2  * Copyright (c) 2001, 2006, 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 "incls/_precompiled.incl"
  26 #include "incls/_threadCritical_linux.cpp.incl"
  27 
  28 // put OS-includes here
  29 # include <pthread.h>
  30 
  31 //
  32 // See threadCritical.hpp for details of this class.
  33 //
  34 
  35 static pthread_t             tc_owner = 0;
  36 static pthread_mutex_t       tc_mutex = PTHREAD_MUTEX_INITIALIZER;
  37 static int                   tc_count = 0;
  38 
  39 void ThreadCritical::initialize() {
  40 }
  41 
  42 void ThreadCritical::release() {
  43 }
  44 
  45 ThreadCritical::ThreadCritical() {
  46   pthread_t self = pthread_self();
  47   if (self != tc_owner) {
  48     int ret = pthread_mutex_lock(&tc_mutex);
  49     guarantee(ret == 0, "fatal error with pthread_mutex_lock()");
  50     assert(tc_count == 0, "Lock acquired with illegal reentry count.");
  51     tc_owner = self;
  52   }
  53   tc_count++;
  54 }
  55 
  56 ThreadCritical::~ThreadCritical() {
  57   assert(tc_owner == pthread_self(), "must have correct owner");
  58   assert(tc_count > 0, "must have correct count");
  59 
  60   tc_count--;
  61   if (tc_count == 0) {
  62     tc_owner = 0;
  63     int ret = pthread_mutex_unlock(&tc_mutex);
  64     guarantee(ret == 0, "fatal error with pthread_mutex_unlock()");
  65   }
  66 }