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d6e0eb0a48
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.
108 lines
3 KiB
C
108 lines
3 KiB
C
/*-
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* Copyright (c) 2002 Daniel Eischen <deischen@freebsd.org>.
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* Copyright (c) 2005 David Xu <davidxu@freebsd.org>.
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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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* 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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* 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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#include <sys/types.h>
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#include <machine/sysarch.h>
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#define CPU_SPINWAIT __asm __volatile("pause")
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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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* %gs 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;
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};
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/*
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* Evaluates to the byte offset of the per-tcb variable name.
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*/
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#define __tcb_offset(name) __offsetof(struct tcb, name)
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/*
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* Evaluates to the type of the per-tcb variable name.
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*/
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#define __tcb_type(name) __typeof(((struct tcb *)0)->name)
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/*
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* Evaluates to the value of the per-tcb variable name.
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*/
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#define TCB_GET32(name) ({ \
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__tcb_type(name) __result; \
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\
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u_int __i; \
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__asm __volatile("movl %%gs:%1, %0" \
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: "=r" (__i) \
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: "m" (*(u_int *)(__tcb_offset(name)))); \
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__result = (__tcb_type(name))__i; \
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\
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__result; \
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})
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/*
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* The 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 *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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i386_set_gsbase(tcb);
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}
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/* Get the current kcb. */
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static __inline struct tcb *
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_tcb_get(void)
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{
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return (TCB_GET32(tcb_self));
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}
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/* Get the current thread. */
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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_GET32(tcb_thread));
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}
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#define HAS__UMTX_OP_ERR 1
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#endif
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