java-thread.md中的一个问题

[Huiaong]

在 https://github.com/zhonghuasheng/Tutorial/blob/master/java/basic/java-thread.md#%E7%BA%BF%E7%A8%8B%E7%9A%84%E8%AE%A9%E6%AD%A5yeild
代码中Yield#call方法使用了synchronized导致Thread.yield()失效

[Huiaong]

并且我不明白为什么会失效

[zhonghuasheng]

并且我不明白为什么会失效

没明白你说的失效是什么意思

[Huiaong]

并且我不明白为什么会失效

没明白你说的失效是什么意思

就是代码运行起来并没有达到yield的效果，如果你去掉synchronized关键字就达到了yield的效果

yeild1 -------1
yeild1 -------2
yeild1 -------3
yeild1 -------4
yeild1 -------5should be yield
yeild1 -------6
yeild1 -------7
yeild1 -------8
yeild1 -------9
yeild1 -------10should be yield
yeild1 -------11
yeild1 -------12
yeild1 -------13
yeild1 -------14
yeild1 -------15should be yield
yeild1 -------16
yeild1 -------17
yeild1 -------18
yeild1 -------19
yeild3 -------0should be yield
yeild3 -------1
yeild3 -------2
yeild3 -------3
yeild3 -------4
yeild3 -------5should be yield
yeild3 -------6
yeild3 -------7
yeild3 -------8
yeild3 -------9
yeild3 -------10should be yield
yeild3 -------11
yeild3 -------12
yeild3 -------13
yeild3 -------14
yeild3 -------15should be yield
yeild3 -------16
yeild3 -------17
yeild3 -------18
yeild3 -------19
yeild2 -------0should be yield
yeild2 -------1
yeild2 -------2
yeild2 -------3
yeild2 -------4
yeild2 -------5should be yield
yeild2 -------6
yeild2 -------7
yeild2 -------8
yeild2 -------9
yeild2 -------10should be yield
yeild2 -------11
yeild2 -------12
yeild2 -------13
yeild2 -------14
yeild2 -------15should be yield
yeild2 -------16
yeild2 -------17
yeild2 -------18
yeild2 -------19
yeild7 -------0should be yield
yeild7 -------1
yeild7 -------2
yeild7 -------3
yeild7 -------4
yeild7 -------5should be yield
yeild7 -------6
yeild7 -------7
yeild7 -------8
yeild7 -------9
yeild7 -------10should be yield
yeild7 -------11
yeild7 -------12
yeild7 -------13
yeild7 -------14
yeild7 -------15should be yield
yeild7 -------16
yeild7 -------17
yeild7 -------18
yeild7 -------19
yeild9 -------0should be yield
yeild9 -------1
yeild9 -------2
yeild9 -------3
yeild9 -------4
yeild9 -------5should be yield
yeild9 -------6
yeild9 -------7
yeild9 -------8
yeild9 -------9
yeild9 -------10should be yield
yeild9 -------11
yeild9 -------12
yeild9 -------13
yeild9 -------14
yeild9 -------15should be yield
yeild9 -------16
yeild9 -------17
yeild9 -------18
yeild9 -------19
yeild6 -------0should be yield
yeild6 -------1
yeild6 -------2
yeild6 -------3
yeild6 -------4
yeild6 -------5should be yield
yeild6 -------6
yeild6 -------7
yeild6 -------8
yeild6 -------9
yeild6 -------10should be yield
yeild6 -------11
yeild6 -------12
yeild6 -------13
yeild6 -------14
yeild6 -------15should be yield
yeild6 -------16
yeild6 -------17
yeild6 -------18
yeild6 -------19
yeild5 -------0should be yield
yeild5 -------1
yeild5 -------2
yeild5 -------3
yeild5 -------4
yeild5 -------5should be yield
yeild5 -------6
yeild5 -------7
yeild5 -------8
yeild5 -------9
yeild5 -------10should be yield
yeild5 -------11
yeild5 -------12
yeild5 -------13
yeild5 -------14
yeild5 -------15should be yield
yeild5 -------16
yeild5 -------17
yeild5 -------18
yeild5 -------19
yeild4 -------0should be yield
yeild4 -------1
yeild4 -------2
yeild4 -------3
yeild4 -------4
yeild4 -------5should be yield
yeild4 -------6
yeild4 -------7
yeild4 -------8
yeild4 -------9
yeild4 -------10should be yield
yeild4 -------11
yeild4 -------12
yeild4 -------13
yeild4 -------14
yeild4 -------15should be yield
yeild4 -------16
yeild4 -------17
yeild4 -------18
yeild4 -------19
yeild0 -------0should be yield
yeild0 -------1
yeild0 -------2
yeild0 -------3
yeild0 -------4
yeild0 -------5should be yield
yeild0 -------6
yeild0 -------7
yeild0 -------8
yeild0 -------9
yeild0 -------10should be yield
yeild0 -------11
yeild0 -------12
yeild0 -------13
yeild0 -------14
yeild0 -------15should be yield
yeild0 -------16
yeild0 -------17
yeild0 -------18
yeild0 -------19
yeild8 -------0should be yield
yeild8 -------1
yeild8 -------2
yeild8 -------3
yeild8 -------4
yeild8 -------5should be yield
yeild8 -------6
yeild8 -------7
yeild8 -------8
yeild8 -------9
yeild8 -------10should be yield
yeild8 -------11
yeild8 -------12
yeild8 -------13
yeild8 -------14
yeild8 -------15should be yield
yeild8 -------16
yeild8 -------17
yeild8 -------18
yeild8 -------19

Process finished with exit code 0```

[zhonghuasheng]

是的，需要把synchronized去掉。加上synchronized关键字是可以测出来在同步方法中执行Thread.yeild()会不会起作用