| // checking if errno is thread safe |
| |
| /*************************************************************************** |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed |
| * with this work for additional information regarding copyright |
| * ownership. The ASF licenses this file to you under the Apache |
| * License, Version 2.0 (the License); you may not use this file |
| * except in compliance with the License. You may obtain a copy of |
| * the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
| * implied. See the License for the specific language governing |
| * permissions and limitations under the License. |
| * |
| * Copyright 1999-2007 Rogue Wave Software, Inc. |
| * |
| **************************************************************************/ |
| |
| #include <errno.h> |
| #include "thread.h" |
| |
| |
| void *errno_addr = 0; |
| |
| |
| extern "C" void* thread_routine (void*) |
| { |
| errno_addr = &errno; |
| return 0; |
| } |
| |
| |
| int main () |
| { |
| pthread_t thread; |
| |
| int err; |
| |
| // create a thread that gets the address of errno |
| if ((err = pthread_create (&thread, 0, thread_routine, 0))) { |
| return 3; |
| } |
| |
| if ((err = pthread_join (thread, 0))) { |
| return 2; |
| } |
| |
| // compare the address of the (presumably) thread-local |
| // errno variable against that of the global errno and |
| // return 0 if they are different, 1 otherwise |
| return !(&errno != errno_addr); |
| } |