cleanup_defer_compat.c 2.9 KB

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  1. /* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
  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. The GNU C Library is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. Lesser General Public License for more details.
  12. You should have received a copy of the GNU Lesser General Public
  13. License along with the GNU C Library; if not, write to the Free
  14. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  15. 02111-1307 USA. */
  16. #include "pthreadP.h"
  17. void
  18. _pthread_cleanup_push_defer (
  19. struct _pthread_cleanup_buffer *buffer,
  20. void (*routine) (void *),
  21. void *arg)
  22. {
  23. struct pthread *self = THREAD_SELF;
  24. buffer->__routine = routine;
  25. buffer->__arg = arg;
  26. buffer->__prev = THREAD_GETMEM (self, cleanup);
  27. int cancelhandling = THREAD_GETMEM (self, cancelhandling);
  28. /* Disable asynchronous cancellation for now. */
  29. if (__builtin_expect (cancelhandling & CANCELTYPE_BITMASK, 0))
  30. while (1)
  31. {
  32. int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling,
  33. cancelhandling
  34. & ~CANCELTYPE_BITMASK,
  35. cancelhandling);
  36. if (__builtin_expect (curval == cancelhandling, 1))
  37. /* Successfully replaced the value. */
  38. break;
  39. /* Prepare for the next round. */
  40. cancelhandling = curval;
  41. }
  42. buffer->__canceltype = (cancelhandling & CANCELTYPE_BITMASK
  43. ? PTHREAD_CANCEL_ASYNCHRONOUS
  44. : PTHREAD_CANCEL_DEFERRED);
  45. THREAD_SETMEM (self, cleanup, buffer);
  46. }
  47. strong_alias (_pthread_cleanup_push_defer, __pthread_cleanup_push_defer)
  48. void
  49. _pthread_cleanup_pop_restore (
  50. struct _pthread_cleanup_buffer *buffer,
  51. int execute)
  52. {
  53. struct pthread *self = THREAD_SELF;
  54. THREAD_SETMEM (self, cleanup, buffer->__prev);
  55. int cancelhandling;
  56. if (__builtin_expect (buffer->__canceltype != PTHREAD_CANCEL_DEFERRED, 0)
  57. && ((cancelhandling = THREAD_GETMEM (self, cancelhandling))
  58. & CANCELTYPE_BITMASK) == 0)
  59. {
  60. while (1)
  61. {
  62. int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling,
  63. cancelhandling
  64. | CANCELTYPE_BITMASK,
  65. cancelhandling);
  66. if (__builtin_expect (curval == cancelhandling, 1))
  67. /* Successfully replaced the value. */
  68. break;
  69. /* Prepare for the next round. */
  70. cancelhandling = curval;
  71. }
  72. CANCELLATION_P (self);
  73. }
  74. /* If necessary call the cleanup routine after we removed the
  75. current cleanup block from the list. */
  76. if (execute)
  77. buffer->__routine (buffer->__arg);
  78. }
  79. strong_alias (_pthread_cleanup_pop_restore, __pthread_cleanup_pop_restore)