1 /* 2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2012, 2014 SAP SE. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #include "precompiled.hpp" 27 #include "runtime/threadCritical.hpp" 28 #include "runtime/thread.inline.hpp" 29 30 // put OS-includes here 31 # include <pthread.h> 32 33 // 34 // See threadCritical.hpp for details of this class. 35 // 36 37 static pthread_t tc_owner = 0; 38 static pthread_mutex_t tc_mutex = PTHREAD_MUTEX_INITIALIZER; 39 static int tc_count = 0; 40 41 ThreadCritical::ThreadCritical() { 42 pthread_t self = pthread_self(); 43 if (self != tc_owner) { 44 int ret = pthread_mutex_lock(&tc_mutex); 45 guarantee(ret == 0, "fatal error with pthread_mutex_lock()"); 46 assert(tc_count == 0, "Lock acquired with illegal reentry count."); 47 tc_owner = self; 48 } 49 tc_count++; 50 } 51 52 ThreadCritical::~ThreadCritical() { 53 assert(tc_owner == pthread_self(), "must have correct owner"); 54 assert(tc_count > 0, "must have correct count"); 55 56 tc_count--; 57 if (tc_count == 0) { 58 tc_owner = 0; 59 int ret = pthread_mutex_unlock(&tc_mutex); 60 guarantee(ret == 0, "fatal error with pthread_mutex_unlock()"); 61 } 62 }