sources/liblfds/slist/slist_get_and_set.c

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#include "slist_internal.h"
#if defined(HLX_BUILD_WITH_PARALLEL_THREADING)

int slist_get_user_data_from_element( struct slist_element *se, void **user_data )
{
  int
    rv = 1;

  *user_data = (void *) se->user_data_and_flags[SLIST_USER_DATA];

  if( (atom_t) se->user_data_and_flags[SLIST_FLAGS] & SLIST_FLAG_DELETED )
    rv = 0;

  return( rv );
}

struct slist_element *slist_get_head( struct slist_state *ss, struct slist_element **se )
{
  *se = (struct slist_element *) ss->head;

  slist_internal_move_to_first_undeleted_element( se );

  return( *se );
}

struct slist_element *slist_get_next( struct slist_element *se, struct slist_element **next_se )
{
  *next_se = (struct slist_element *) se->next;

  slist_internal_move_to_first_undeleted_element( next_se );

  return( *next_se );
}

struct slist_element *slist_get_head_and_then_next( struct slist_state *ss, struct slist_element **se )
{
  if( *se == 0 )
    slist_get_head( ss, se );
  else
    slist_get_next( *se, se );

  return( *se );
}

void slist_internal_move_to_first_undeleted_element( struct slist_element **se )
{
  while( *se != 0 and (atom_t) (*se)->user_data_and_flags[SLIST_FLAGS] & SLIST_FLAG_DELETED )
    (*se) = (struct slist_element *) (*se)->next;

  return;
}

#endif /* !HLX_BUILD_WITH_PARALLEL_THREADING */