Re: [boost] [fiber] new version in vault

Subject: Re: [boost] [fiber] new version in vault
From: Phil Endecott (spam_from_boost_dev_at_[hidden])
Date: 2009-12-01 11:11:34

Stefan Strasser wrote:
> why would you want to use hashed mutexes when you can implement a mutex in the 
> size of a reference into a mutex table?

Say I have:

uint16_t counters[1000000];

If I want to use those counters from two threads I could pair each one 
with a mutex.  With some thought I might be able to do that with just 
one bit per counter, but that's still 125 kbytes.  Or, I could have 13 
mutexes and hash from counter i to mutex i%13; even with a 24-byte 
pthread_mutex that's only 312 bytes.

Phil.