Write Barrier: General

Functions
void	__tm_write_barrier (void *ptr)
	Write barrier for general references.

---

Function Documentation

void __tm_write_barrier

(

void *

ptr

)

Write barrier for general references.

Begin time stats.

If the ptr is a reference to a stack allocated object, do nothing, because the stack will be marked before the sweep phase.

Otherwise, if the ptr is a reference to a node, schedule it for remarking if it has already been marked.

If it is not a reference to a node, It must be a reference to a statically allocated object. This means the data root set has (probably) been mutated. Must flag the roots for remarking before the sweep phase.

End time stats.

Definition at line 223 of file barrier.c.

References tm_data::data_mutations, tm_root::h, RETURN, tm_data::roots, tm_data::stack_mutations, tm, tm_msg(), tm_ptr_to_node(), tm_time_stat_begin(), tm_time_stat_end(), tm_write_barrier_node(), and tm_data::ts_barrier.

Referenced by tm_init().

{
  tm_node *n;

  /*! Begin time stats. */
#if tm_TIME_STAT
  tm_time_stat_begin(&tm.ts_barrier);
#endif

  /**
   * If the ptr is a reference to a stack allocated object,
   * do nothing, because the stack will be marked before
   * the sweep phase.
   */
  if ( (void*) &ptr <= ptr && ptr <= tm.roots[1].h ) {
    ++ tm.stack_mutations; 
    // tm_msg("w s p%p\n", ptr);
    RETURN;
  }

  /**
   * Otherwise,
   * if the ptr is a reference to a node,
   * schedule it for remarking if it has already been marked.
   *
   * If it is not a reference to a node,
   * It must be a reference to a statically allocated object.
   * This means the data root set has (probably) been mutated.
   * Must flag the roots for remarking before the sweep phase.
   */
  if ( (n = tm_ptr_to_node(ptr)) ) {
    tm_write_barrier_node(n);
  } else {
    ++ tm.data_mutations;
#if 0
    tm_msg("w r p%p\n", ptr);
#endif
  }

 _return:
  (void) 0;

  /*! End time stats. */
#if tm_TIME_STAT
  tm_time_stat_end(&tm.ts_barrier);
#endif
}

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