sysdeps/mach/hurd/mig-reply.c

   1 /* Copyright (C) 1994,1995,1996,1997,2005 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <mach.h>
  20 #include <hurd/threadvar.h>
  21
  22 #define GETPORT \
  23   mach_port_t *portloc = \
  24     (mach_port_t *) __hurd_threadvar_location (_HURD_THREADVAR_MIG_REPLY)
  25 #define reply_port (*(use_threadvar ? portloc : &global_reply_port))
  26
  27 static int use_threadvar;
  28 static mach_port_t global_reply_port;
  29
  30 /* These functions are called by MiG-generated code.  */
  31
  32 /* Called by MiG to get a reply port.  */
  33 mach_port_t
  34 __mig_get_reply_port (void)
  35 {
  36   GETPORT;
  37
  38   if (reply_port == MACH_PORT_NULL)
  39     reply_port = __mach_reply_port ();
  40
  41   return reply_port;
  42 }
  43 weak_alias (__mig_get_reply_port, mig_get_reply_port)
  44
  45 /* Called by MiG to deallocate the reply port.  */
  46 void
  47 __mig_dealloc_reply_port (mach_port_t arg)
  48 {
  49   mach_port_t port;
  50
  51   GETPORT;
  52
  53   port = reply_port;
  54   reply_port = MACH_PORT_NULL;  /* So the mod_refs RPC won't use it.  */
  55
  56   if (MACH_PORT_VALID (port))
  57     __mach_port_mod_refs (__mach_task_self (), port,
  58                           MACH_PORT_RIGHT_RECEIVE, -1);
  59 }
  60 weak_alias (__mig_dealloc_reply_port, mig_dealloc_reply_port)
  61
  62 /* Called by mig interfaces when done with a port.  Used to provide the
  63    same interface as needed when a custom allocator is used.  */
  64 void
  65 __mig_put_reply_port(mach_port_t port)
  66 {
  67   /* Do nothing.  */
  68 }
  69 weak_alias (__mig_put_reply_port, mig_put_reply_port)
  70
  71 /* Called at startup with STACK == NULL.  When per-thread variables are set
  72    up, this is called again with STACK set to the new stack being switched
  73    to, where per-thread variables should be set up.  */
  74 void
  75 __mig_init (void *stack)
  76 {
  77   use_threadvar = stack != 0;
  78
  79   if (use_threadvar)
  80     {
  81       /* Recycle the reply port used before multithreading was enabled.  */
  82       mach_port_t *portloc = (mach_port_t *)
  83         __hurd_threadvar_location_from_sp (_HURD_THREADVAR_MIG_REPLY, stack);
  84       *portloc = global_reply_port;
  85       global_reply_port = MACH_PORT_NULL;
  86     }
  87 }
  88 weak_alias (__mig_init, mig_init)