erlang 进程消息和状态

最新推荐文章于 2017-09-21 19:55:00 发布

whatiserlang

最新推荐文章于 2017-09-21 19:55:00 发布

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分类专栏： erlang 文章标签： Dictionary state erlang

本文链接：https://blog.youkuaiyun.com/phyzhou/article/details/8955089

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本文介绍了两种在Erlang中查看进程消息和状态的方法。通过使用`whereis`获取进程ID，然后利用`process_info`或`si:ppi`展示进程消息，以及借助`sys:get_status`来获取进程状态。

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显示某进程的消息：

方法一：

1> Pid = whereis(?MODULE).

2> process_info(Pid) .

whereis(room_manager).
<0.107.0>
process_info(Pid).
[{registered_name,room_manager},
 {current_function,{gen_server,loop,6}},
 {initial_call,{proc_lib,init_p,5}},
 {status,waiting},
 {message_queue_len,0},
 {messages,[]},
 {links,[<0.102.0>]},
 {dictionary,[{'$ancestors',[server_sup,<0.101.0>]},
              {'$initial_call',{room_manager,init,1}}]},
 {trap_exit,true},
 {error_handler,error_handler},
 {priority,normal},
 {group_leader,<0.100.0>},
 {total_heap_size,233},
 {heap_size,233},
 {stack_size,9},
 {reductions,37},
 {garbage_collection,[{min_bin_vheap_size,46368},
                      {min_heap_size,233},
                      {fullsweep_after,65535},
                      {minor_gcs,0}]},
 {suspending,[]}]

方法二：

1> Pid = whereis(?MODULE).

2> si:ppi(Pid).

si:ppi(Pid).
  
Pretty Process Info
-------------------
[{registered_name,room_manager},
 {current_function,{gen_server,loop,6}},
 {initial_call,{proc_lib,init_p,5}},
 {status,waiting},
 {message_queue_len,0},
 {messages,[]},
 {links,[<0.102.0>]},
 {dictionary,[{'$ancestors',[server_sup,<0.101.0>]},
              {'$initial_call',{room_manager,init,1}}]},
 {trap_exit,true},
 {error_handler,error_handler},
 {priority,normal},
 {group_leader,<0.100.0>},
 {total_heap_size,233},
 {heap_size,233},
 {stack_size,9},
 {reductions,37},
 {garbage_collection,[{min_bin_vheap_size,46368},
                      {min_heap_size,233},
                      {fullsweep_after,65535},
                      {minor_gcs,0}]},
 {suspending,[]}]
ok

显示进行的状态

方法：

1> Pid = whereis(?MODULE).

2> sys:get_status(Pid).

sys:get_status(Pid).
{status,<0.107.0>,
        {module,gen_server},
        [[{'$ancestors',[server_sup,<0.101.0>]},
          {'$initial_call',{room_manager,init,1}}],
         running,<0.102.0>,[],
         [{header,"Status for generic server room_manager"},
          {data,[{"Status",running},
                 {"Parent",<0.102.0>},
                 {"Logged events",[]}]},
          {data,[{"State",["room_server1"]}]}]]}