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| daniele_athome |
 Posted: Wed Apr 05, 2006 11:53 pm |
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Hi all! I have a problem with network host resolution in my multithreaded
application. Because of gethostbyname() which uses static data (i.e. is not
designed for multiple threads), I often have some "unexpected" results,
like this:
localhost 192.168.0.1
router 192.168.0.1
the second is right, the first not.
This happens if I make more than one resolution at a time.
One way could be locking the gethostbyname(), but until it will finish its
task, it won't exit and won't permit other thread to proceed with host
resolution...
What can I do without requiring external libraries? Or, if external
libraries are needed, can you suggest me any that is multithreaded?
thanks
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daniele_athome |
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| Scott Lacy Salley |
| Posted: Sun Apr 09, 2006 11:44 pm |
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In article <G02Zf.53150$nz4.41649@tornado.fastwebnet.it>, daniele_athome wrote:
Quote: Hi all! I have a problem with network host resolution in my multithreaded
application. Because of gethostbyname() which uses static data (i.e. is not
designed for multiple threads), I often have some "unexpected" results,
gethostbyname_r
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Scott Lacy Salley <scottlacysalley@comcast.net>
formerly Scott Lacy Smith |
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| daniele_athome |
| Posted: Mon Apr 10, 2006 3:49 am |
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Guest
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Scott Lacy Salley wrote:
Quote: In article <G02Zf.53150$nz4.41649@tornado.fastwebnet.it>, daniele_athome
wrote:
Hi all! I have a problem with network host resolution in my multithreaded
application. Because of gethostbyname() which uses static data (i.e. is
not designed for multiple threads), I often have some "unexpected"
results,
gethostbyname_r
it doesn't work i'll use getaddrinfo
thanks anyway
bye 
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daniele_athome |
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| Scott Lacy Salley |
| Posted: Wed Apr 19, 2006 12:03 am |
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In article <8Sp_f.7166$QM3.4031@tornado.fastwebnet.it>, daniele_athome wrote:
Quote: Scott Lacy Salley wrote:
In article <G02Zf.53150$nz4.41649@tornado.fastwebnet.it>, daniele_athome
wrote:
Hi all! I have a problem with network host resolution in my multithreaded
application. Because of gethostbyname() which uses static data (i.e. is
not designed for multiple threads), I often have some "unexpected"
results,
gethostbyname_r
it doesn't work i'll use getaddrinfo
Why or what doesn't work about it? Is it unavailable on your system or is
there a bug in it?
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Scott Lacy Salley <scottlacysalley@comcast.net>
formerly Scott Lacy Smith |
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| Steve Thompson |
| Posted: Thu Apr 20, 2006 3:45 pm |
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On Wed, 19 Apr 2006, Scott Lacy Salley wrote:
Quote: In article <8Sp_f.7166$QM3.4031@tornado.fastwebnet.it>, daniele_athome wrote:
Scott Lacy Salley wrote:
In article <G02Zf.53150$nz4.41649@tornado.fastwebnet.it>,
daniele_athome wrote:
Hi all! I have a problem with network host resolution in my multithreaded
application. Because of gethostbyname() which uses static data (i.e. is
not designed for multiple threads), I often have some "unexpected"
results,
gethostbyname_r
it doesn't work i'll use getaddrinfo
Why or what doesn't work about it? Is it unavailable on your system or is
there a bug in it?
The problem is that gethostbyname() is not thread safe. If I have to use
it, and cannot use _r, I usually surround gethostbyname() by a mutex.
Steve |
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