6ce2f878d3
o Set TP using inline assembly to avoid dead code elimination. o Eliminate _tcb. Merge from r161840: Stylize: avoid using a global register variable. Merge from r157461: Simplify _get_curthread() and _tcb_ctor because libc and rtld now already allocate thread pointer space in tls block for initial thread. Merge from r177853: Replace function _umtx_op with _umtx_op_err, the later function directly returns errno, because errno can be mucked by user's signal handler and most of pthread api heavily depends on errno to be correct, this change should improve stability of the thread library. MFC after: 1 week
85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
/*-
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* Copyright (c) 2003 Jake Burkholder <jake@freebsd.org>.
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* Copyright (c) 2003 Marcel Moolenaar
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Machine-dependent thread prototypes/definitions.
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*/
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#ifndef _PTHREAD_MD_H_
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#define _PTHREAD_MD_H_
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#include <stddef.h>
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#define CPU_SPINWAIT
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#define DTV_OFFSET offsetof(struct tcb, tcb_dtv)
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/*
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* Variant II tcb, first two members are required by rtld.
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* %g7 points to the structure.
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*/
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struct tcb {
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struct tcb *tcb_self; /* required by rtld */
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void *tcb_dtv; /* required by rtld */
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struct pthread *tcb_thread; /* our hook */
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void *tcb_spare[1];
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};
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/*
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* The tcb constructors.
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*/
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struct tcb *_tcb_ctor(struct pthread *, int);
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void _tcb_dtor(struct tcb *);
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/* Called from the thread to set its private data. */
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static __inline void
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_tcb_set(struct tcb *tcb)
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{
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__asm __volatile("mov %0, %%g7" : : "r" (tcb));
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}
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static __inline struct tcb *
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_tcb_get(void)
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{
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register struct tcb *tp __asm("%g7");
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return (tp);
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}
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static __inline struct pthread *
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_get_curthread(void)
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{
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return (_tcb_get()->tcb_thread);
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}
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#define HAS__UMTX_OP_ERR 1
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#endif /* _PTHREAD_MD_H_ */
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