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#1
October 7th, 2004, 05:28 PM
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how semaphores can be used?
i have a questions that i don't quite understan and i would like some help.
Servers may be designed so that they limit the number of open connections. For example, a server may only wish to have N socket connections at any point and time. As soon as N connections are made, the server willnot except another incoming connection until an existing connection is released. how can semaphores be used by a server to limit the number of concurrent connecitons?
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#2
October 8th, 2004, 02:46 PM
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semaphores can count from 0 .... 100. When a connection is added, the sempahore is incrmented, and when a connection goes away, the semaphore is decremented.
When the semaphore value is 100, no more connections are allowed until it decrements to 99.
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#3
October 10th, 2004, 04:25 AM
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jim, i don't believe that limit of 100
on my solaris in /usr/include/limits.h i read #define _POSIX_SEM_VALUE_MAX 32767
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#4
October 11th, 2004, 09:21 AM
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He wanted 100 connections - the limit for POSIX is 0xffff because the semaphore is a unsigned short word - 16 bits.
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