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rtld_tls.h
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Editing: rtld_tls.h
/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2004 Doug Rabson * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD$ */ /* * Semi-public interface from thread libraries to rtld for managing * TLS. */ #ifndef _RTLD_TLS_H_ #define _RTLD_TLS_H_ /* * Allocate a TLS block for a new thread. The memory allocated will * include 'tcbsize' bytes aligned to a 'tcbalign' boundary (in bytes) * for the thread library's private purposes. The location of the TCB * block is returned by this function. For architectures using * 'Variant I' TLS, the thread local storage follows the TCB, and for * 'Variant II', the thread local storage precedes it. For * architectures using the 'Variant II' model (e.g. i386, amd64) the * TCB must begin with two pointer fields which are used by rtld for * its TLS implementation. For the 'Variant I' model, the TCB must * begin with a single pointer field for rtld's implementation. * * If the value of 'oldtls' is non-NULL, the new TLS block will be * initialised using the values contained in 'oldtls' and 'oldtls' * will be freed. This is typically used when initialising a thread * library to migrate from using the initial bootstrap TLS block * created by rtld to one which contains suitable thread library * private data. * * The value returned from this function is suitable for installing * directly into the thread pointer register. */ void *_rtld_allocate_tls(void* oldtls, size_t tcbsize, size_t tcbalign) __exported; /* * Free a TLS block allocated using _rtld_allocate_tls(). The tcbsize * and tcbalign parameters must be the same as those used to allocate * the block. */ void _rtld_free_tls(void *tcb, size_t tcbsize, size_t tcbalign) __exported; #endif
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