nptl/nptl_free_tcb.c

   1 /* TCB deallocation for NPTL.
   2    Copyright (C) 2002-2024 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 <nptl-stack.h>
  20 #include <pthreadP.h>
  21 #include <stdlib.h>
  22
  23 void
  24 __nptl_free_tcb (struct pthread *pd)
  25 {
  26   /* The thread is exiting now.  */
  27   if ((atomic_fetch_or_relaxed (&pd->cancelhandling, TERMINATED_BITMASK)
  28       & TERMINATED_BITMASK) == 0)
  29     {
  30       /* Free TPP data.  */
  31       if (pd->tpp != NULL)
  32         {
  33           struct priority_protection_data *tpp = pd->tpp;
  34
  35           pd->tpp = NULL;
  36           free (tpp);
  37         }
  38
  39       /* Queue the stack memory block for reuse and exit the process.  The
  40          kernel will signal via writing to the address returned by
  41          QUEUE-STACK when the stack is available.  */
  42       __nptl_deallocate_stack (pd);
  43     }
  44 }
  45 libc_hidden_def (__nptl_free_tcb)