Write Barrier: Root

Functions
void	__tm_write_barrier_root (void *ptr)
	Write barrier for root or stack pointers.

---

Function Documentation

void __tm_write_barrier_root

(

void *

ptr

)

Write barrier for root or stack pointers.

Don't know if this root has been marked yet or not.

Begin time stats.

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

Otherwise, If the ptr is a reference to the heap. Do nothing, because we haven't started marking yet.

Otherwise, ptr must be a pointer to statically allocated (root) object. Mark the roots as being mutated.

End time stats.

Definition at line 159 of file barrier.c.

References _tm_page_in_use(), tm_data::data_mutations, tm_root::h, RETURN, tm_data::roots, tm_data::stack_mutations, tm, tm_msg(), tm_ptr_h, tm_ptr_l, tm_time_stat_begin(), tm_time_stat_end(), and tm_data::ts_barrier_root.

Referenced by tm_init().

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

  /**
   * If the ptr is a reference to a stack allocated object,
   * do nothing, because the stack will be scanned atomically before
   * the sweep phase.
   */
  if ( (void*) &ptr <= ptr && ptr <= tm.roots[1].h ) {
    ++ tm.stack_mutations; 
#if 0
    tm_msg("w s p%p\n", ptr);
#endif
    RETURN;
  }

  /**
   * Otherwise,
   * If the ptr is a reference to the heap. 
   * Do nothing, because we haven't started marking yet.
   */
#if 1
  if ( _tm_page_in_use(ptr) ) 
    RETURN;
#else
  if ( tm_ptr_l <= ptr && ptr <= tm_ptr_h )
    RETURN;
#endif

  /**
   * Otherwise, ptr must be a pointer to statically allocated (root) object.
   * Mark the roots as being mutated.
   */
  ++ 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_root);
#endif
}

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