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

   1 /* Start thread.  Mach version.
   2    Copyright (C) 2000-2018 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <assert.h>
  20 #include <errno.h>
  21 #include <mach.h>
  22
  23 #include <pt-internal.h>
  24
  25 /* Start THREAD.  Get the kernel thread scheduled and running.  */
  26 int
  27 __pthread_thread_start (struct __pthread *thread)
  28 {
  29   static int do_start;
  30   error_t err;
  31
  32   if (!do_start)
  33     {
  34       /* The main thread is already running: do nothing.  */
  35       assert (__pthread_total == 1);
  36       assert ((
  37                 {
  38                   mach_port_t ktid = __mach_thread_self ();
  39                   int ok = thread->kernel_thread == ktid;
  40                   __mach_port_deallocate (__mach_task_self (),
  41                                           thread->kernel_thread);
  42                   ok;
  43                 }));
  44       do_start = 1;
  45     }
  46   else
  47     {
  48       err = __thread_resume (thread->kernel_thread);
  49       assert_perror (err);
  50     }
  51
  52   return 0;
  53 }