关于flex的多线程

hsum

最近用flex&bison的时候,发现貌似默认flex是不可重入的,开多个线程同时调用yyparse()的时候,flex就混乱了,查了资料说flex的c代码默认是不可重入的，c++是可重入的,不过c代码加一些参数就可以实现多线程安全了，不知道有没有人了解具体怎么实现，指教下，谢谢

ah13k

加入
%pure_parser

hsum

ls能详细点吗？

单单加一句pure_parse貌似不行，

ah13k

info flex
这种基本的能力你自己要会。

1. 
   
2. `-R, --reentrant, `%option reentrant''
   
3.      instructs flex to generate a reentrant C scanner.  The generated
   
4.      scanner may safely be used in a multi-threaded environment. The
   
5.      API for a reentrant scanner is different than for a non-reentrant
   
6.      scanner *note Reentrant::).  Because of the API difference between
   
7.      reentrant and non-reentrant `flex' scanners, non-reentrant flex
   
8.      code must be modified before it is suitable for use with this
   
9.      option.  This option is not compatible with the `--c++' option.
   
10. 
    
11.      The option `--reentrant' does not affect the performance of the
    
12.      scanner.
    

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1. 
   
2. 19 Reentrant C Scanners
   
3. ***********************
   
4. 
   
5. `flex' has the ability to generate a reentrant C scanner. This is
   
6. accomplished by specifying `%option reentrant' (`-R') The generated
   
7. scanner is both portable, and safe to use in one or more separate
   
8. threads of control.  The most common use for reentrant scanners is from
   
9. within multi-threaded applications.  Any thread may create and execute
   
10. a reentrant `flex' scanner without the need for synchronization with
    
11. other threads.
    

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ah13k

如果你还不明白，那就自己想办法把
http://compilers.iecc.com/comparch/article/98-01-017
这个链接你可以参考一下

东北008

看看，喜欢好的创意