From mboxrd@z Thu Jan  1 00:00:00 1970
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References: <Pine.LNX.4.64.0906081807350.385@tank.cs.indiana.edu>
Date: Tue,  9 Jun 2009 15:11:24 -0700
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Subject: Re: [9fans] critique of sockets API
From: Russ Cox <rsc@swtch.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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> * performance overhead: app requesting data from a socket typically needs to
> perform 2 system calls (select/read or alt/read) * lack of an "kernel
> up-call API": which allows the kernel to inform an app each time network
> data is available

there is a mechanism.
user programs call read(2).
when data is available,
the read finishes.