1  /* Block a 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  
      22  #include <mach.h>
      23  #include <mach/message.h>
      24  
      25  #include <pt-internal.h>
      26  
      27  #ifndef MSG_OPTIONS
      28  # define MSG_OPTIONS 0
      29  #endif
      30  
      31  #ifndef RETTYPE
      32  # define RETTYPE void
      33  #endif
      34  
      35  #ifndef RETURN
      36  # define RETURN(val)
      37  #endif
      38  
      39  /* Block THREAD.  */
      40  RETTYPE
      41  __pthread_block (struct __pthread *thread)
      42  {
      43    mach_msg_header_t msg;
      44    error_t err;
      45  
      46    err = __mach_msg (&msg, MACH_RCV_MSG | MSG_OPTIONS, 0, sizeof msg,
      47  		    thread->wakeupmsg.msgh_remote_port,
      48  		    MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
      49    if ((MSG_OPTIONS & MACH_RCV_INTERRUPT) && err == MACH_RCV_INTERRUPTED)
      50      RETURN(EINTR);
      51    assert_perror (err);
      52    RETURN(0);
      53  }