td_ta_map_id2thr.c 2.3 KB

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  1. /* Map thread ID to thread handle.
  2. Copyright (C) 1999, 2001, 2002 Free Software Foundation, Inc.
  3. This file is part of the GNU C Library.
  4. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.
  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. 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. You should have received a copy of the GNU Lesser General Public
  14. License along with the GNU C Library; if not, see
  15. <http://www.gnu.org/licenses/>. */
  16. #include "thread_dbP.h"
  17. #include <linuxthreads/internals.h>
  18. td_err_e
  19. td_ta_map_id2thr (const td_thragent_t *ta, pthread_t pt, td_thrhandle_t *th)
  20. {
  21. struct pthread_handle_struct phc;
  22. struct _pthread_descr_struct pds;
  23. int pthread_threads_max;
  24. LOG ("td_ta_map_id2thr");
  25. /* Test whether the TA parameter is ok. */
  26. if (! ta_ok (ta))
  27. return TD_BADTA;
  28. /* Make the following expression a bit smaller. */
  29. pthread_threads_max = ta->pthread_threads_max;
  30. /* We can compute the entry in the handle array we want. */
  31. if (ps_pdread (ta->ph, ta->handles + pt % pthread_threads_max, &phc,
  32. sizeof (struct pthread_handle_struct)) != PS_OK)
  33. return TD_ERR; /* XXX Other error value? */
  34. /* Test whether this entry is in use. */
  35. if (phc.h_descr == NULL)
  36. {
  37. if (pt % pthread_threads_max == 0)
  38. {
  39. /* The initial thread always exists but the thread library
  40. might not yet be initialized. */
  41. th->th_ta_p = (td_thragent_t *) ta;
  42. th->th_unique = NULL;
  43. return TD_OK;
  44. }
  45. return TD_BADTH;
  46. }
  47. /* Next test: get the descriptor to see whether this is not an old
  48. thread handle. */
  49. if (ps_pdread (ta->ph, phc.h_descr, &pds,
  50. sizeof (struct _pthread_descr_struct)) != PS_OK)
  51. return TD_ERR; /* XXX Other error value? */
  52. if (pds.p_tid != pt)
  53. return TD_BADTH;
  54. if (pds.p_terminated != 0)
  55. return TD_NOTHR;
  56. /* Create the `td_thrhandle_t' object. */
  57. th->th_ta_p = (td_thragent_t *) ta;
  58. th->th_unique = phc.h_descr;
  59. return TD_OK;
  60. }