1 /* 2 * Copyright (c) 2001, 2010, 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 "precompiled.hpp" 26 #include "runtime/thread.inline.hpp" 27 #include "runtime/threadCritical.hpp" 28 29 // put OS-includes here 30 # include <pthread.h> 31 32 // 33 // See threadCritical.hpp for details of this class. 34 // 35 36 static pthread_t tc_owner = 0; 37 static pthread_mutex_t tc_mutex = PTHREAD_MUTEX_INITIALIZER; 38 static int tc_count = 0; 39 40 ThreadCritical::ThreadCritical() { 41 pthread_t self = pthread_self(); 42 if (self != tc_owner) { 43 int ret = pthread_mutex_lock(&tc_mutex); 44 guarantee(ret == 0, "fatal error with pthread_mutex_lock()"); 45 assert(tc_count == 0, "Lock acquired with illegal reentry count."); 46 tc_owner = self; 47 } 48 tc_count++; 49 } 50 51 ThreadCritical::~ThreadCritical() { 52 assert(tc_owner == pthread_self(), "must have correct owner"); 53 assert(tc_count > 0, "must have correct count"); 54 55 tc_count--; 56 if (tc_count == 0) { 57 tc_owner = 0; 58 int ret = pthread_mutex_unlock(&tc_mutex); 59 guarantee(ret == 0, "fatal error with pthread_mutex_unlock()"); 60 } 61 }