105436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* Multithreading primitives. 205436638acc7c010349a69c3395f1a57c642dc62Ying Wang Copyright (C) 2005-2012 Free Software Foundation, Inc. 305436638acc7c010349a69c3395f1a57c642dc62Ying Wang 405436638acc7c010349a69c3395f1a57c642dc62Ying Wang This program is free software; you can redistribute it and/or modify 505436638acc7c010349a69c3395f1a57c642dc62Ying Wang it under the terms of the GNU General Public License as published by 605436638acc7c010349a69c3395f1a57c642dc62Ying Wang the Free Software Foundation; either version 3, or (at your option) 705436638acc7c010349a69c3395f1a57c642dc62Ying Wang any later version. 805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 905436638acc7c010349a69c3395f1a57c642dc62Ying Wang This program is distributed in the hope that it will be useful, 1005436638acc7c010349a69c3395f1a57c642dc62Ying Wang but WITHOUT ANY WARRANTY; without even the implied warranty of 1105436638acc7c010349a69c3395f1a57c642dc62Ying Wang MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1205436638acc7c010349a69c3395f1a57c642dc62Ying Wang GNU General Public License for more details. 1305436638acc7c010349a69c3395f1a57c642dc62Ying Wang 1405436638acc7c010349a69c3395f1a57c642dc62Ying Wang You should have received a copy of the GNU General Public License 1505436638acc7c010349a69c3395f1a57c642dc62Ying Wang along with this program; if not, see <http://www.gnu.org/licenses/>. */ 1605436638acc7c010349a69c3395f1a57c642dc62Ying Wang 1705436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* Written by Bruno Haible <bruno@clisp.org>, 2005. */ 1805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 1905436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <config.h> 2005436638acc7c010349a69c3395f1a57c642dc62Ying Wang 2105436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* ========================================================================= */ 2205436638acc7c010349a69c3395f1a57c642dc62Ying Wang 2305436638acc7c010349a69c3395f1a57c642dc62Ying Wang#if USE_POSIX_THREADS 2405436638acc7c010349a69c3395f1a57c642dc62Ying Wang 2505436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* Use the POSIX threads library. */ 2605436638acc7c010349a69c3395f1a57c642dc62Ying Wang 2705436638acc7c010349a69c3395f1a57c642dc62Ying Wang# include <pthread.h> 2805436638acc7c010349a69c3395f1a57c642dc62Ying Wang# include <stdlib.h> 2905436638acc7c010349a69c3395f1a57c642dc62Ying Wang 3005436638acc7c010349a69c3395f1a57c642dc62Ying Wang# if PTHREAD_IN_USE_DETECTION_HARD 3105436638acc7c010349a69c3395f1a57c642dc62Ying Wang 3205436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* The function to be executed by a dummy thread. */ 3305436638acc7c010349a69c3395f1a57c642dc62Ying Wangstatic void * 3405436638acc7c010349a69c3395f1a57c642dc62Ying Wangdummy_thread_func (void *arg) 3505436638acc7c010349a69c3395f1a57c642dc62Ying Wang{ 3605436638acc7c010349a69c3395f1a57c642dc62Ying Wang return arg; 3705436638acc7c010349a69c3395f1a57c642dc62Ying Wang} 3805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 3905436638acc7c010349a69c3395f1a57c642dc62Ying Wangint 4005436638acc7c010349a69c3395f1a57c642dc62Ying Wangglthread_in_use (void) 4105436638acc7c010349a69c3395f1a57c642dc62Ying Wang{ 4205436638acc7c010349a69c3395f1a57c642dc62Ying Wang static int tested; 4305436638acc7c010349a69c3395f1a57c642dc62Ying Wang static int result; /* 1: linked with -lpthread, 0: only with libc */ 4405436638acc7c010349a69c3395f1a57c642dc62Ying Wang 4505436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (!tested) 4605436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 4705436638acc7c010349a69c3395f1a57c642dc62Ying Wang pthread_t thread; 4805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 4905436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (pthread_create (&thread, NULL, dummy_thread_func, NULL) != 0) 5005436638acc7c010349a69c3395f1a57c642dc62Ying Wang /* Thread creation failed. */ 5105436638acc7c010349a69c3395f1a57c642dc62Ying Wang result = 0; 5205436638acc7c010349a69c3395f1a57c642dc62Ying Wang else 5305436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 5405436638acc7c010349a69c3395f1a57c642dc62Ying Wang /* Thread creation works. */ 5505436638acc7c010349a69c3395f1a57c642dc62Ying Wang void *retval; 5605436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (pthread_join (thread, &retval) != 0) 5705436638acc7c010349a69c3395f1a57c642dc62Ying Wang abort (); 5805436638acc7c010349a69c3395f1a57c642dc62Ying Wang result = 1; 5905436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 6005436638acc7c010349a69c3395f1a57c642dc62Ying Wang tested = 1; 6105436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 6205436638acc7c010349a69c3395f1a57c642dc62Ying Wang return result; 6305436638acc7c010349a69c3395f1a57c642dc62Ying Wang} 6405436638acc7c010349a69c3395f1a57c642dc62Ying Wang 6505436638acc7c010349a69c3395f1a57c642dc62Ying Wang# endif 6605436638acc7c010349a69c3395f1a57c642dc62Ying Wang 6705436638acc7c010349a69c3395f1a57c642dc62Ying Wang#endif 6805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 6905436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* ========================================================================= */ 7005436638acc7c010349a69c3395f1a57c642dc62Ying Wang 7105436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* This declaration is solely to ensure that after preprocessing 7205436638acc7c010349a69c3395f1a57c642dc62Ying Wang this file is never empty. */ 7305436638acc7c010349a69c3395f1a57c642dc62Ying Wangtypedef int dummy; 74