1  /* Start thread.  Mach version.
       2     Copyright (C) 2000-2023 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 <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  }