1 /* 2 * Copyright (c) 2001, 2016, 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/os.hpp" 27 #include "runtime/thread.inline.hpp" 28 #include "runtime/threadCritical.hpp" 29 30 // OS-includes here 31 #include <thread.h> 32 #include <synch.h> 33 34 // 35 // See threadCritical.hpp for details of this class. 36 // 37 // For some reason, we don't do locking until the 38 // os::init() call completes. I'm not sure why this 39 // is, and have left it that way for now. This should 40 // be reviewed later. 41 42 static mutex_t global_mut; 43 static thread_t global_mut_owner = -1; 44 static int global_mut_count = 0; 45 46 ThreadCritical::ThreadCritical() { 47 if (os::Solaris::synchronization_initialized()) { 48 thread_t owner = thr_self(); 49 if (global_mut_owner != owner) { 50 if (os::Solaris::mutex_lock(&global_mut)) 51 fatal("ThreadCritical::ThreadCritical: mutex_lock failed (%s)", 52 os::strerror(errno)); 53 assert(global_mut_count == 0, "must have clean count"); 54 assert(global_mut_owner == -1, "must have clean owner"); 55 } 56 global_mut_owner = owner; 57 ++global_mut_count; 58 } else { 59 assert (Threads::number_of_threads() == 0, "valid only during initialization"); 60 } 61 } 62 63 ThreadCritical::~ThreadCritical() { 64 if (os::Solaris::synchronization_initialized()) { 65 assert(global_mut_owner == thr_self(), "must have correct owner"); 66 assert(global_mut_count > 0, "must have correct count"); 67 --global_mut_count; 68 if (global_mut_count == 0) { 69 global_mut_owner = -1; 70 if (os::Solaris::mutex_unlock(&global_mut)) 71 fatal("ThreadCritical::~ThreadCritical: mutex_unlock failed (%s)", os::strerror(errno)); 72 } 73 } else { 74 assert (Threads::number_of_threads() == 0, "valid only during initialization"); 75 } 76 }