sysdeps/mach/htl/pt-thread-terminate.c

   1 /* Deallocate the kernel thread resources.  Mach version.
   2    Copyright (C) 2000-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library;  if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <assert.h>
  20 #include <errno.h>
  21 #include <mach.h>
  22
  23 #include <mach/mig_support.h>
  24
  25 #include <pt-internal.h>
  26
  27 /* Terminate the kernel thread associated with THREAD, and deallocate its
  28    right reference and its stack.  The function also drops a reference
  29    on THREAD.  */
  30 void
  31 __pthread_thread_terminate (struct __pthread *thread)
  32 {
  33   thread_t kernel_thread, self_ktid;
  34   mach_port_t wakeup_port, reply_port;
  35   void *stackaddr;
  36   size_t stacksize;
  37   error_t err;
  38   int self;
  39
  40   kernel_thread = thread->kernel_thread;
  41
  42   if (thread->stack)
  43     {
  44       stackaddr = thread->stackaddr;
  45       stacksize = ((thread->guardsize + __vm_page_size - 1)
  46                    / __vm_page_size) * __vm_page_size + thread->stacksize;
  47     }
  48   else
  49     {
  50       stackaddr = NULL;
  51       stacksize = 0;
  52     }
  53
  54   wakeup_port = thread->wakeupmsg.msgh_remote_port;
  55
  56   self_ktid = __mach_thread_self ();
  57   self = self_ktid == kernel_thread;
  58   __mach_port_deallocate (__mach_task_self (), self_ktid);
  59
  60   /* The kernel thread won't be there any more.  */
  61   thread->kernel_thread = MACH_PORT_DEAD;
  62
  63   /* Release thread resources.  */
  64   __pthread_dealloc (thread);
  65
  66   /* The wake up port (needed for locks in __pthread_dealloc) is now no longer
  67      needed.  */
  68   __mach_port_destroy (__mach_task_self (), wakeup_port);
  69
  70   /* Each thread has its own reply port, allocated from MiG stub code calling
  71      __mig_get_reply_port.  Destroying it is a bit tricky because the calls
  72      involved are also RPCs, causing the creation of a new reply port if
  73      currently null. The __thread_terminate_release call is actually a one way
  74      simple routine designed not to require a reply port.  */
  75   reply_port = self ? __mig_get_reply_port () : MACH_PORT_NULL;
  76   /* From here we shall not use a MIG reply port any more.  */
  77
  78   /* Finally done with the thread structure (we still needed it to access the
  79      reply port).  */
  80   __pthread_dealloc_finish (thread);
  81
  82   /* Terminate and release all that's left.  */
  83   err = __thread_terminate_release (kernel_thread, mach_task_self (),
  84                                     kernel_thread, reply_port,
  85                                     (vm_address_t) stackaddr, stacksize);
  86
  87   /* The kernel does not support it yet.  Leak but at least terminate
  88      correctly.  */
  89   err = __thread_terminate (kernel_thread);
  90
  91   /* We are out of luck.  */
  92   assert_perror (err);
  93 }