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glibc  2.9
Functions
td_thr_tsd.c File Reference
#include "thread_dbP.h"

Go to the source code of this file.

Functions

td_err_e td_thr_tsd (const td_thrhandle_t *th, const thread_key_t tk, void **data)

Function Documentation

td_err_e td_thr_tsd ( const td_thrhandle_t th,
const thread_key_t  tk,
void **  data 
)

Definition at line 25 of file td_thr_tsd.c.

{
  td_err_e err;
  psaddr_t tk_seq, level1, level2, seq, value;
  void *copy;
  uint32_t pthread_key_2ndlevel_size, idx1st, idx2nd;

  LOG ("td_thr_tsd");

  /* Get the key entry.  */
  err = DB_GET_VALUE (tk_seq, th->th_ta_p, __pthread_keys, tk);
  if (err == TD_NOAPLIC)
    return TD_BADKEY;
  if (err != TD_OK)
    return err;

  /* Fail if this key is not at all used.  */
  if (((uintptr_t) tk_seq & 1) == 0)
    return TD_BADKEY;

  /* This makes sure we have the size information on hand.  */
  err = DB_GET_FIELD_ADDRESS (level2, th->th_ta_p, 0, pthread_key_data_level2,
                           data, 1);
  if (err != TD_OK)
    return err;

  /* Compute the indeces.  */
  pthread_key_2ndlevel_size
    = DB_DESC_NELEM (th->th_ta_p->ta_field_pthread_key_data_level2_data);
  idx1st = tk / pthread_key_2ndlevel_size;
  idx2nd = tk % pthread_key_2ndlevel_size;

  /* Now fetch the first level pointer.  */
  err = DB_GET_FIELD (level1, th->th_ta_p, th->th_unique, pthread,
                    specific, idx1st);
  if (err == TD_NOAPLIC)
    return TD_DBERR;
  if (err != TD_OK)
    return err;

  /* Check the pointer to the second level array.  */
  if (level1 == 0)
    return TD_NOTSD;

  /* Locate the element within the second level array.  */
  err = DB_GET_FIELD_ADDRESS (level2, th->th_ta_p,
                           level1, pthread_key_data_level2, data, idx2nd);
  if (err == TD_NOAPLIC)
    return TD_DBERR;
  if (err != TD_OK)
    return err;

  /* Now copy in that whole structure.  */
  err = DB_GET_STRUCT (copy, th->th_ta_p, level2, pthread_key_data);
  if (err != TD_OK)
    return err;

  /* Check whether the data is valid.  */
  err = DB_GET_FIELD_LOCAL (seq, th->th_ta_p, copy, pthread_key_data, seq, 0);
  if (err != TD_OK)
    return err;
  if (seq != tk_seq)
    return TD_NOTSD;

  /* Finally, fetch the value.  */
  err = DB_GET_FIELD_LOCAL (value, th->th_ta_p, copy, pthread_key_data,
                         data, 0);
  if (err == TD_OK)
    *data = value;

  return err;
}

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