threadCritical_linux.cpp revision 0:a61af66fc99e 
1/*
2 * Copyright 2001-2006 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 */
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
35static pthread_t             tc_owner = 0;
36static pthread_mutex_t       tc_mutex = PTHREAD_MUTEX_INITIALIZER;
37static int                   tc_count = 0;
38
39void ThreadCritical::initialize() {
40}
41
42void ThreadCritical::release() {
43}
44
45ThreadCritical::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
56ThreadCritical::~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}
67