在 https://github.com/giorgiosironi/erlang-2pc/blob/master/nodes.erl#L95 中,我生成了 3 个进程,这些进程在算法完成后终止(或者我认为:它们的函数返回(。我认为 start/0 函数也已终止。
我开始执行这个函数:
erl -noshell -run nodes test_commit -noshell
执行函数后,我得到预期的输出:
<0.30.0> - As coordinator added cohort: <0.31.0>
<0.31.0> - Will propose: yes
<0.32.0> - Will propose: yes
<0.30.0> - As coordinator added cohort: <0.32.0>
<0.30.0> - As coordinator, 1st phase trying to commit
<0.31.0> - Queried by coordinator
<0.32.0> - Queried by coordinator
<0.30.0> - As coordinator received a yes
<0.30.0> - As coordinator received a yes
<0.30.0> - As coordinator, 2nd phase
<0.31.0> - COMMIT!
<0.32.0> - COMMIT!
<0.30.0> - COMMIT!
但随后外壳无限期地挂在那里。我用 CTRL+C 退出,然后 (A(bort。
为什么外壳没有自行终止?如何检查在此挂起状态下哪些进程仍处于活动状态?如果正常,如何以编程方式从测试脚本终止它?
您需要告诉运行时在完成函数运行后停止。一种方法是使用 init:stop/0
函数:
erl -noinput -run nodes test_commit -s init stop
请注意,-noinput
选项还意味着-noshell
。