erlang 进程消息和状态

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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"]}]}]]}