nptl/cleanup_defer.c

   1 /* Copyright (C) 2002-2022 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 <stdlib.h>
  19 #include "pthreadP.h"
  20 #include <shlib-compat.h>
  21
  22 void
  23 __cleanup_fct_attribute
  24 ___pthread_register_cancel_defer (__pthread_unwind_buf_t *buf)
  25 {
  26   struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf;
  27   struct pthread *self = THREAD_SELF;
  28
  29   /* Store old info.  */
  30   ibuf->priv.data.prev = THREAD_GETMEM (self, cleanup_jmp_buf);
  31   ibuf->priv.data.cleanup = THREAD_GETMEM (self, cleanup);
  32
  33   /* Disable asynchronous cancellation for now.  */
  34   ibuf->priv.data.canceltype = THREAD_GETMEM (self, canceltype);
  35   THREAD_SETMEM (self, canceltype, PTHREAD_CANCEL_DEFERRED);
  36
  37   /* Store the new cleanup handler info.  */
  38   THREAD_SETMEM (self, cleanup_jmp_buf, (struct pthread_unwind_buf *) buf);
  39 }
  40 versioned_symbol (libc, ___pthread_register_cancel_defer,
  41                   __pthread_register_cancel_defer, GLIBC_2_34);
  42
  43 #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_34)
  44 compat_symbol (libpthread, ___pthread_register_cancel_defer,
  45                __pthread_register_cancel_defer, GLIBC_2_3_3);
  46 #endif
  47
  48 void
  49 __cleanup_fct_attribute
  50 ___pthread_unregister_cancel_restore (__pthread_unwind_buf_t *buf)
  51 {
  52   struct pthread *self = THREAD_SELF;
  53   struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf;
  54
  55   THREAD_SETMEM (self, cleanup_jmp_buf, ibuf->priv.data.prev);
  56
  57   THREAD_SETMEM (self, canceltype, ibuf->priv.data.canceltype);
  58   if (ibuf->priv.data.canceltype == PTHREAD_CANCEL_ASYNCHRONOUS)
  59     __pthread_testcancel ();
  60 }
  61 versioned_symbol (libc, ___pthread_unregister_cancel_restore,
  62                   __pthread_unregister_cancel_restore, GLIBC_2_34);
  63
  64 #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_34)
  65 compat_symbol (libpthread, ___pthread_unregister_cancel_restore,
  66                __pthread_unregister_cancel_restore, GLIBC_2_3_3);
  67 #endif