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69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
/* Demux messages sent on the signal port.
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Copyright (C) 1991-2020 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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#include <hurd.h>
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#include <hurd/signal.h>
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#include <stddef.h>
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struct demux
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{
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struct demux *next;
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boolean_t (*demux) (mach_msg_header_t *inp,
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mach_msg_header_t *outp);
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};
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struct demux *_hurd_msgport_demuxers = NULL;
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extern boolean_t __msg_server (mach_msg_header_t *inp,
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mach_msg_header_t *outp);
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static boolean_t
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msgport_server (mach_msg_header_t *inp,
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mach_msg_header_t *outp)
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{
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extern boolean_t _S_msg_server (mach_msg_header_t *inp,
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mach_msg_header_t *outp);
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extern boolean_t _S_exc_server (mach_msg_header_t *inp,
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mach_msg_header_t *outp);
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struct demux *d;
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for (d = _hurd_msgport_demuxers; d != NULL; d = d->next)
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if ((*d->demux) (inp, outp))
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return 1;
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return (_S_exc_server (inp, outp)
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|| _S_msg_server (inp, outp));
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}
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/* This is the code that the signal thread runs. */
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void *
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_hurd_msgport_receive (void *arg)
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{
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/* Get our own sigstate cached so we never again have to take a lock to
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fetch it. There is much code in hurdsig.c that operates with some
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sigstate lock held, which will deadlock with _hurd_thread_sigstate.
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Furthermore, in the pthread case this is the convenient spot
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to initialize _hurd_msgport_thread (see hurdsig.c:_hurdsig_init). */
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_hurd_msgport_thread = _hurd_self_sigstate ()->thread;
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while (1)
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(void) __mach_msg_server (msgport_server, __vm_page_size, _hurd_msgport);
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}
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