threadCritical_solaris.cpp revision 0:a61af66fc99e 
1/*
2 * Copyright 2001-2003 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_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        fatal1("ThreadCritical::ThreadCritical: mutex_lock failed (%s)", strerror(errno));
51      assert(global_mut_count == 0, "must have clean count");
52      assert(global_mut_owner == -1, "must have clean owner");
53    }
54    global_mut_owner = owner;
55    ++global_mut_count;
56  } else {
57    assert (Threads::number_of_threads() == 0, "valid only during initialization");
58  }
59}
60
61ThreadCritical::~ThreadCritical() {
62  if (initialized) {
63    assert(global_mut_owner == thr_self(), "must have correct owner");
64    assert(global_mut_count > 0, "must have correct count");
65    --global_mut_count;
66    if (global_mut_count == 0) {
67      global_mut_owner = -1;
68      if (os::Solaris::mutex_unlock(&global_mut))
69        fatal1("ThreadCritical::~ThreadCritical: mutex_unlock failed (%s)", strerror(errno));
70    }
71  } else {
72    assert (Threads::number_of_threads() == 0, "valid only during initialization");
73  }
74}
75
76void ThreadCritical::initialize() {
77  // This method is called at the end of os::init(). Until
78  // then, we don't do real locking.
79  initialized = true;
80}
81
82void ThreadCritical::release() {
83}
84