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1 /*
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2 * Copyright 2001-2003 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 #include "incls/_precompiled.incl"
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26 #include "incls/_threadCritical_solaris.cpp.incl"
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27
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28 // OS-includes here
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29 #include <thread.h>
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30 #include <synch.h>
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31
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32 //
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33 // See threadCritical.hpp for details of this class.
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34 //
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35 // For some reason, we don't do locking until the
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36 // os::init() call completes. I'm not sure why this
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37 // is, and have left it that way for now. This should
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38 // be reviewed later.
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39
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40 static mutex_t global_mut;
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41 static thread_t global_mut_owner = -1;
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42 static int global_mut_count = 0;
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43 static bool initialized = false;
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44
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45 ThreadCritical::ThreadCritical() {
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46 if (initialized) {
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47 thread_t owner = thr_self();
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48 if (global_mut_owner != owner) {
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49 if (os::Solaris::mutex_lock(&global_mut))
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50 fatal1("ThreadCritical::ThreadCritical: mutex_lock failed (%s)", strerror(errno));
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51 assert(global_mut_count == 0, "must have clean count");
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52 assert(global_mut_owner == -1, "must have clean owner");
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53 }
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54 global_mut_owner = owner;
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55 ++global_mut_count;
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56 } else {
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57 assert (Threads::number_of_threads() == 0, "valid only during initialization");
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58 }
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59 }
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60
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61 ThreadCritical::~ThreadCritical() {
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62 if (initialized) {
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63 assert(global_mut_owner == thr_self(), "must have correct owner");
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64 assert(global_mut_count > 0, "must have correct count");
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65 --global_mut_count;
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66 if (global_mut_count == 0) {
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67 global_mut_owner = -1;
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68 if (os::Solaris::mutex_unlock(&global_mut))
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69 fatal1("ThreadCritical::~ThreadCritical: mutex_unlock failed (%s)", strerror(errno));
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70 }
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71 } else {
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72 assert (Threads::number_of_threads() == 0, "valid only during initialization");
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73 }
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74 }
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75
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76 void ThreadCritical::initialize() {
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77 // This method is called at the end of os::init(). Until
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78 // then, we don't do real locking.
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79 initialized = true;
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80 }
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81
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82 void ThreadCritical::release() {
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83 }
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