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81 lines
2.6 KiB
C
81 lines
2.6 KiB
C
/* Definition for thread-local data handling. Generic version.
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Copyright (C) 2002-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* An architecture-specific version of this file has to defined a
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number of symbols:
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TLS_TCB_AT_TP or TLS_DTV_AT_TP
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The presence of one of these symbols signals which variant of
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the TLS ABI is used. There are in the moment two variants
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available:
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* the thread pointer points to a thread control block
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* the thread pointer points to the dynamic thread vector
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TLS_TCB_SIZE
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This is the size of the thread control block structure. How
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this is actually defined depends on the ABI. The thread control
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block could be internal descriptor of the thread library or
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just a data structure which allows finding the DTV.
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TLS_INIT_TCB_SIZE
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Similarly, but this value is only used at startup and in the
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dynamic linker itself. There are no threads in use at that time.
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TLS_TCB_ALIGN
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Alignment requirements for the TCB structure.
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TLS_INIT_TCB_ALIGN
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Similarly, but for the structure used at startup time.
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INSTALL_DTV(tcb, init_dtv)
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This macro must install the given initial DTV into the thread control
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block TCB. The normal runtime functionality must then be able to
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use the value.
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TLS_INIT_TP(tcb)
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This macro must initialize the thread pointer to enable normal TLS
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operation. The parameter is a pointer to the thread control block.
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ld.so calls this macro once.
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THREAD_DTV()
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This macro returns the address of the DTV of the current thread.
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This normally is done using the thread register which points
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to the dtv or the TCB (from which the DTV can found).
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THREAD_GSCOPE_IN_TCB
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This should be set to 1 if the global scope flag is stored within the TCB.
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When set to 0, GL(_dl_thread_gscope_count) will be defined to store it.
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*/
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