1 /* 2 * Copyright (c) 2001 Daniel Eischen <deischen@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Neither the name of the author nor the names of any co-contributors 11 * may be used to endorse or promote products derived from this software 12 * without specific prior written permission. 13 * 14 * THIS SOFTWARE IS PROVIDED BY DANIEL EISCHEN AND CONTRIBUTORS ``AS IS'' 15 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 28 #include <sys/cdefs.h> 29 #include <sys/types.h> 30 #include "libc_private.h" 31 32 void _thread_init_stub(void); 33 void _nmalloc_thr_init(void); 34 void _upmap_thr_init(void); 35 36 int _thread_autoinit_dummy_decl_stub = 0; 37 38 /* 39 * This stub is overridden when libpthreads is linked in. However, 40 * we can apply the constructor to the weak reference. Instead the 41 * constructor is applied to the stub and we do a run-time check to 42 * see if the stub has been overridden by pthreads. 43 */ 44 void _thread_init_stub(void) __attribute__ ((constructor)); 45 __weak_reference(_thread_init_stub, _thread_init); 46 47 void 48 _thread_init_stub(void) 49 { 50 /* 51 * Only run libc related pthreads initialization from here 52 * if pthreads did not override the weak reference. Otherwise 53 * pthreads will do it after setting up a real thread context. 54 */ 55 if (_thread_init == _thread_init_stub) { 56 _libc_thr_init(); 57 } 58 } 59 60 /* 61 * Pre-initialization prior to thread startup to avoid certain 62 * chicken-and-egg issues with low-level allocations. 63 */ 64 void 65 _libc_thr_init(void) 66 { 67 _nmalloc_thr_init(); 68 _upmap_thr_init(); 69 } 70 71 __weak_reference(_thread_autoinit_dummy_decl_stub, _thread_autoinit_dummy_decl); 72