跟蹤asio日志
#define BOOST_ASIO_ENABLE_HANDLER_TRACKING
#include <boost/asio.hpp>
./a.out 2>out.log
sudo apt-get install graphviz
perl handlerviz.pl < out.log | dot -Tpng > out.png

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@asio|1528964168.087468|01|signal_set@0x7ffc87552888.async_wait
@asio|1528964168.087629|02|signal_set@0x7ffc87552888.async_wait@asio|1528964181.199519|>1|ec=system:0,signal_number=10
br/>@asio|1528964181.199519|>1|ec=system:0,signal_number=10
br/>@asio|1528964181.199628|>2|ec=system:0,signal_number=10
@asio|1528964181.199717|0|signal_set@0x7ffc87552888.cancel

out.log格式解釋，請參考 https://www.boost.org/doc/libs/1_47_0/doc/html/boost_asio/overview/core/handler_tracking.html

摘抄過來：
Each line is of the form:

<tag>|<timestamp>|<action>|<description>

The <tag> is always @asio, and is used to identify and extract the handler tracking messages from the program output.

The <timestamp> is seconds and microseconds from 1 Jan 1970 UTC.

The <action> takes one of the following forms:

n

The program entered the handler number n. The <description> shows the arguments to the handler. 

<n

The program left handler number n. 

!n

The program left handler number n due to an exception. 

~n

The handler number n was destroyed without having been invoked. This is usually the case for any unfinished asynchronous operations when the io_service is destroyed. 

n*m

The handler number n created a new asynchronous operation with completion handler number m. The <description> shows what asynchronous operation was started. 

n

The handler number n performed some other operation. The <description> shows what function was called. Currently only close() and cancel() operations are logged, as these may affect the state of pending asynchronous operations. 

Where the <description> shows a synchronous or asynchronous operation, the format is <object-type>@<pointer>.<operation>. For handler entry, it shows a comma-separated list of arguments and their values.

As shown above, Each handler is assigned a numeric identifier. Where the handler tracking output shows a handler number of 0, it means that the action was performed outside of any handler.

本文名稱：跟蹤asio日志
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