nptl/cleanup_defer.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 <stdlib.h>
  20 #include "pthreadP.h"
  21 #include <shlib-compat.h>
  22
  23 void
  24 __cleanup_fct_attribute
  25 ___pthread_register_cancel_defer (__pthread_unwind_buf_t *buf)
  26 {
  27   struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf;
  28   struct pthread *self = THREAD_SELF;
  29
  30   /* Store old info.  */
  31   ibuf->priv.data.prev = THREAD_GETMEM (self, cleanup_jmp_buf);
  32   ibuf->priv.data.cleanup = THREAD_GETMEM (self, cleanup);
  33
  34   /* Disable asynchronous cancellation for now.  */
  35   ibuf->priv.data.canceltype = THREAD_GETMEM (self, canceltype);
  36   THREAD_SETMEM (self, canceltype, PTHREAD_CANCEL_DEFERRED);
  37
  38   /* Store the new cleanup handler info.  */
  39   THREAD_SETMEM (self, cleanup_jmp_buf, (struct pthread_unwind_buf *) buf);
  40 }
  41 versioned_symbol (libc, ___pthread_register_cancel_defer,
  42                   __pthread_register_cancel_defer, GLIBC_2_34);
  43
  44 #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_34)
  45 compat_symbol (libpthread, ___pthread_register_cancel_defer,
  46                __pthread_register_cancel_defer, GLIBC_2_3_3);
  47 #endif
  48
  49 void
  50 __cleanup_fct_attribute
  51 ___pthread_unregister_cancel_restore (__pthread_unwind_buf_t *buf)
  52 {
  53   struct pthread *self = THREAD_SELF;
  54   struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf;
  55
  56   THREAD_SETMEM (self, cleanup_jmp_buf, ibuf->priv.data.prev);
  57
  58   THREAD_SETMEM (self, canceltype, ibuf->priv.data.canceltype);
  59   if (ibuf->priv.data.canceltype == PTHREAD_CANCEL_ASYNCHRONOUS)
  60     __pthread_testcancel ();
  61 }
  62 versioned_symbol (libc, ___pthread_unregister_cancel_restore,
  63                   __pthread_unregister_cancel_restore, GLIBC_2_34);
  64
  65 #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_34)
  66 compat_symbol (libpthread, ___pthread_unregister_cancel_restore,
  67                __pthread_unregister_cancel_restore, GLIBC_2_3_3);
  68 #endif