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 
  40 static  mutex_t  global_mut;
  41 static  thread_t global_mut_owner = -1;
  42 static  int      global_mut_count = 0;
  43 static  bool     initialized = false;
  44 
  45 ThreadCritical::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 
  62 ThreadCritical::~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 
  78 void 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 
  84 void ThreadCritical::release() {
  85 }