threadCritical_solaris.cpp revision 1472:c18cbe5936b8 
1/*
2 * Copyright (c) 2001, 2003, 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_solaris.cpp.incl"
27
28// OS-includes here
29#include <thread.h>
30#include <synch.h>
31
32//
33// See threadCritical.hpp for details of this class.
34//
35// For some reason, we don't do locking until the
36// os::init() call completes. I'm not sure why this
37// is, and have left it that way for now. This should
38// be reviewed later.
39
40static  mutex_t  global_mut;
41static  thread_t global_mut_owner = -1;
42static  int      global_mut_count = 0;
43static  bool     initialized = false;
44
45ThreadCritical::ThreadCritical() {
46  if (initialized) {
47    thread_t owner = thr_self();
48    if (global_mut_owner != owner) {
49      if (os::Solaris::mutex_lock(&global_mut))
50        fatal(err_msg("ThreadCritical::ThreadCritical: mutex_lock failed (%s)",
51                      strerror(errno)));
52      assert(global_mut_count == 0, "must have clean count");
53      assert(global_mut_owner == -1, "must have clean owner");
54    }
55    global_mut_owner = owner;
56    ++global_mut_count;
57  } else {
58    assert (Threads::number_of_threads() == 0, "valid only during initialization");
59  }
60}
61
62ThreadCritical::~ThreadCritical() {
63  if (initialized) {
64    assert(global_mut_owner == thr_self(), "must have correct owner");
65    assert(global_mut_count > 0, "must have correct count");
66    --global_mut_count;
67    if (global_mut_count == 0) {
68      global_mut_owner = -1;
69      if (os::Solaris::mutex_unlock(&global_mut))
70        fatal(err_msg("ThreadCritical::~ThreadCritical: mutex_unlock failed "
71                      "(%s)", strerror(errno)));
72    }
73  } else {
74    assert (Threads::number_of_threads() == 0, "valid only during initialization");
75  }
76}
77
78void ThreadCritical::initialize() {
79  // This method is called at the end of os::init(). Until
80  // then, we don't do real locking.
81  initialized = true;
82}
83
84void ThreadCritical::release() {
85}
86