mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-05 03:01:05 +00:00
b74ea861cb
* sysdeps/generic/tls.h: Describe would must be defined.
80 lines
2.6 KiB
C
80 lines
2.6 KiB
C
/* 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)
|
|
|
|
This macro must initialize the thread pointer to enable normal TLS
|
|
operation. The parameter is a pointer to the thread control block.
|
|
|
|
|
|
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).
|
|
*/
|