6351f43f14
minimize the amount and complexity of assembly code that needs to be written. This way the core functionality is spread over 3 elementary functions that don't have to do anything that can more easily and more safely be done in C. As such, assembly code will only have to know about the definition of mcontext_t. The runtime cost of not having these functions being inlined is less important than the cleanliness and maintainability of the code at this stage of the implementation.
75 lines
2.4 KiB
C
75 lines
2.4 KiB
C
/*
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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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#ifndef _PTHREAD_MD_H_
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#define _PTHREAD_MD_H_
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#define THR_GETCONTEXT(ucp) getcontext(ucp)
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#define THR_SETCONTEXT(ucp) setcontext(ucp)
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#define THR_ALIGNBYTES 15
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#define THR_ALIGN(td) (((uintptr_t)(td) + THR_ALIGNBYTES) & ~THR_ALIGNBYTES)
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/* KSE Specific Data. */
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struct ksd {
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void *ksd_base;
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int ksd_size;
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};
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void _ia64_enter_uts(kse_func_t uts, struct kse_mailbox *km, void *stack,
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size_t stacksz);
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int _ia64_restore_context(mcontext_t *mc, intptr_t val, intptr_t *loc);
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int _ia64_save_context(mcontext_t *mc);
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static __inline int
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_thread_enter_uts(struct kse_thr_mailbox *tm, struct kse_mailbox *km)
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{
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if (tm == NULL)
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return (-1);
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if (!_ia64_save_context(&tm->tm_context.uc_mcontext)) {
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_ia64_enter_uts(km->km_func, km, km->km_stack.ss_sp,
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km->km_stack.ss_size);
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/* We should not reach here. */
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return (-1);
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}
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return (0);
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}
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static __inline int
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_thread_switch(struct kse_thr_mailbox *tm, struct kse_thr_mailbox **thrp)
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{
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if (tm == NULL)
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return (-1);
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_ia64_restore_context(&tm->tm_context.uc_mcontext, (intptr_t)tm,
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(intptr_t*)thrp);
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/* We should not reach here. */
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return (-1);
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}
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#endif /* _PTHREAD_MD_H_ */
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