nptl/pthread_tryjoin.c

   1 /* Copyright (C) 2002-2021 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   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 "pthreadP.h"
  20 #include <shlib-compat.h>
  21
  22 int
  23 __pthread_tryjoin_np (pthread_t threadid, void **thread_return)
  24 {
  25   /* Return right away if the thread hasn't terminated yet.  */
  26   struct pthread *pd = (struct pthread *) threadid;
  27   if (pd->tid != 0)
  28     return EBUSY;
  29
  30   /* If pd->tid == 0 then lll_wait_tid will not block on futex
  31      operation.  */
  32   return __pthread_clockjoin_ex (threadid, thread_return, 0 /* Ignored */,
  33                                  NULL, false);
  34 }
  35 versioned_symbol (libc, __pthread_tryjoin_np, pthread_tryjoin_np, GLIBC_2_34);
  36
  37 #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_34)
  38 compat_symbol (libc, __pthread_tryjoin_np, pthread_tryjoin_np, GLIBC_2_3_3);
  39 #endif