chapter2-day1.md

Review

• Race Conditions

• Memory Visibility

  • CPU caches
  • instruction reordering
  • double-lock pattern

• Deadlock

  • lock ordering
  • alien methods

Self study/Discussion

• Check out William Pugh’s Java memory model website.

• Acquaint yourself with the JSR 133 (Java memory model) FAQ.

• What guarantees does the Java memory model make regarding initializa- tion safety?

• Is it always necessary to use locks to safely publish objects between threads?

• What is the double-checked locking anti-pattern? Why is it an anti-pattern?