Re: [HACKERS] FreeBSD/i386 thread test

[Manfred Spraul]

Jeroen Ruigrok/asmodai wrote:

-On [20030908 23:52], Peter Eisentraut ([EMAIL PROTECTED]) wrote:
 

Why would FreeBSD have a "library of thread-safe libc functions" (libc_r)
if the functions weren't thread-safe?  I think the test is faulty.
   

A thread-safe library has a per-thread errno value (i.e. errno is a 
#define to a function call), thread-safe io buffers for stdio, etc. Some 
of these changes cause a noticable overhead, thus a seperate library for 
those users who want to avoid that overhead.

Reentrancy is independant from _r: If you look at the prototype of 
gethostbyname(), it's just not possible to make that thread safe with 
reasonable effort - the C library would have to keep one buffer per 
thread around.

Having libc_r is not a guarantee that all functions of libc are
represented in that library as thread-safe functions.
gethostbyname_r() is a notable reentrant function which is absent in
FreeBSD.
 

Is there a thread-safe alternate to gethostbyname() for FreeBSD?

--
   Manfred


---------------------------(end of broadcast)---------------------------
TIP 9: the planner will ignore your desire to choose an index scan if your
     joining column's datatypes do not match