pd.if.org Git - liblfds/blob - liblfds/liblfds7.1.0/liblfds710/src/lfds710_queue_bounded_singleproducer_singleconsumer/lfds710_queue_bounded_singleproducer_singleconsumer_dequeue.c

   1 /***** includes *****/
   2 #include "lfds710_queue_bounded_singleproducer_singleconsumer_internal.h"
   3
   4
   5
   6
   7
   8 /****************************************************************************/
   9 int lfds710_queue_bss_dequeue( struct lfds710_queue_bss_state *qbsss,
  10                                void **key,
  11                                void **value )
  12 {
  13   struct lfds710_queue_bss_element
  14     *qbsse;
  15
  16   LFDS710_PAL_ASSERT( qbsss != NULL );
  17   // TRD : key can be NULL
  18   // TRD : value can be NULL
  19
  20   LFDS710_MISC_BARRIER_LOAD;
  21
  22   if( qbsss->read_index != qbsss->write_index )
  23   {
  24     qbsse = qbsss->element_array + qbsss->read_index;
  25
  26     if( key != NULL )
  27       *key = qbsse->key;
  28
  29     if( value != NULL )
  30       *value = qbsse->value;
  31
  32     qbsss->read_index = (qbsss->read_index + 1) & qbsss->mask;
  33
  34     LFDS710_MISC_BARRIER_STORE;
  35
  36     return 1;
  37   }
  38
  39   return 0;
  40 }
  41