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comparison src/os/linux/vm/threadCritical_linux.cpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 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
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 }