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- /* Definition for thread-local data handling. Generic version.
- Copyright (C) 2002 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
- /* By default no TLS support is available. This is signaled by the
- absence of the symbol USE_TLS. */
- #undef USE_TLS
- /* An architecture-specific version of this file has to defined a
- number of symbols:
- TLS_TCB_AT_TP or TLS_DTV_AT_TP
- The presence of one of these symbols signals which variant of
- the TLS ABI is used. There are in the moment two variants
- available:
- * the thread pointer points to a thread control block
- * the thread pointer points to the dynamic thread vector
- TLS_TCB_SIZE
- This is the size of the thread control block structure. How
- this is actually defined depends on the ABI. The thread control
- block could be internal descriptor of the thread library or
- just a data structure which allows finding the DTV.
- TLS_INIT_TCB_SIZE
- Similarly, but this value is only used at startup and in the
- dynamic linker itself. There are no threads in use at that time.
- TLS_TCB_ALIGN
- Alignment requirements for the TCB structure.
- TLS_INIT_TCB_ALIGN
- Similarly, but for the structure used at startup time.
- INSTALL_DTV(tcb, init_dtv)
- This macro must install the given initial DTV into the thread control
- block TCB. The normal runtime functionality must then be able to
- use the value.
- TLS_INIT_TP(tcb, firstcall)
- This macro must initialize the thread pointer to enable normal TLS
- operation. The first parameter is a pointer to the thread control
- block. The second parameter specifies whether this is the first
- call for the TCB. ld.so calls this macro more than once.
- THREAD_DTV()
- This macro returns the address of the DTV of the current thread.
- This normally is done using the the thread register which points
- to the dtv or the TCB (from which the DTV can found).
- */
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