nptl/pthread_tryjoin.c

   1 /* Copyright (C) 2002-2021 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include "pthreadP.h"
  19 #include <shlib-compat.h>
  20
  21 int
  22 __pthread_tryjoin_np (pthread_t threadid, void **thread_return)
  23 {
  24   /* Return right away if the thread hasn't terminated yet.  */
  25   struct pthread *pd = (struct pthread *) threadid;
  26   if (pd->tid != 0)
  27     return EBUSY;
  28
  29   /* If pd->tid == 0 then lll_wait_tid will not block on futex
  30      operation.  */
  31   return __pthread_clockjoin_ex (threadid, thread_return, 0 /* Ignored */,
  32                                  NULL, false);
  33 }
  34 versioned_symbol (libc, __pthread_tryjoin_np, pthread_tryjoin_np, GLIBC_2_34);
  35
  36 #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_34)
  37 compat_symbol (libc, __pthread_tryjoin_np, pthread_tryjoin_np, GLIBC_2_3_3);
  38 #endif