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glibc  2.9
hurd-raise.c
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00001 /* Copyright (C) 1994,95,96,97,99 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <hurd.h>
00020 #include <hurd/signal.h>
00021 #include <hurd/msg.h>
00022 #include <setjmp.h>
00023 
00024 /* Handle signal SIGNO in the calling thread.
00025    If SS is not NULL it is the sigstate for the calling thread;
00026    SS->lock is held on entry and released before return.  */
00027 
00028 void
00029 _hurd_raise_signal (struct hurd_sigstate *ss,
00030                   int signo, const struct hurd_signal_detail *detail)
00031 {
00032   if (ss == NULL)
00033     {
00034       ss = _hurd_self_sigstate ();
00035       __spin_lock (&ss->lock);
00036     }
00037 
00038   /* Mark SIGNO as pending to be delivered.  */
00039   __sigaddset (&ss->pending, signo);
00040   ss->pending_data[signo] = *detail;
00041 
00042   __spin_unlock (&ss->lock);
00043 
00044   /* Send a message to the signal thread so it will wake up and check for
00045      pending signals.  This is a generic "poll request" message (SIGNO==0)
00046      rather than delivering this signal and its detail, because we have
00047      already marked the signal as pending for the particular thread we
00048      want.  Generating the signal with an RPC might deliver it to some
00049      other thread.  */
00050   __msg_sig_post (_hurd_msgport, 0, 0, __mach_task_self ());
00051 }