06-16-2010
I know you want to avoid mutexes, but this is really what they're for. You could try using Linux futexes, which handle the nonblocking case completely in userspace, but I'm not sure what that'd do for memory barriers(this MAY have something to do with a special mmap flag to create the futex pages, though I think futexes have changed several times since I began fiddling with them) -- and modern Linux NPTL pthreads is based on futexes anyway, so you'd just be reinventing pthreads.
Besides, what if you need to move it to MIPS or something?
[edit] One thought does occur to me. How large are these structures? Could you perhaps reorder it to put prefix, instance, and state in order in memory? You could assemble the data in an MMX or SSE register, then overwrite several structure members in one assembly op.
Last edited by Corona688; 06-16-2010 at 03:15 PM..
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LEARN ABOUT SUNOS
libmlib_mt
libmlib_mt(3LIB) libmlib_mt(3LIB)
NAME
libmlib_mt - multi-threaded mediaLib
SYNOPSIS
cc [ flag... ] file... -lmlib_mt -lmlib [ library... ]
#include <mlib.h>
Interfaces in this library provide functions for multimedia processing. Multi-threaded (MT) mediaLib is a software layer developed on top
of mediaLib using OpenMP. When it is used with a large data set on a multi-processor system, MT mediaLib will partition data into subsets
and process the subsets in parallel, thus greatly improving performance of applications that use mediaLib.
INTERFACES
The shared object libmlib_mt.so.2 provides the same public interfaces as those defined in libmlib(3lib). See intro(3) for additional infor-
mation on shared object interfaces.
There are two ways to use MT mediaLib.
1. Pre-load a multi-threaded mediaLib library during runtime by setting the LD_PRELOAD environment variable as follows before starting
your application, in Bourne/Korn shell:
LD_PRELOAD=libmlib_mt.so
export LD_PRELOAD
or in C shell:
setenv LD_PRELOAD libmlib_mt.so
In this way, you can take advantage of MT mediaLib without rebuilding your application.
2. Link your application with a multi-threaded mediaLib library directly as shown under . In this way, an MT mediaLib library is always
used whenever your application is started.
The parallelization of MT mediaLib is controlled, in part, by the PARALLEL environment variable. You can change its setting to adjust the
degree of parallelization before starting your application, in Bourne/Korn shell:
PARALLEL=n
export PARALLEL
or in C shell:
setenv PARALLEL n
where n is a positive integer for number of threads. Note that other factors also affect the degree of parallelization in MT mediaLib.
/usr/lib/libmlib_mt.so.2 shared object
/usr/lib/64/libmlib_mt.so.2 64-bit shared object
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWmlibt |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
Intro(3), libmlib(3lib), attributes(5)
30 Sep 2005 libmlib_mt(3LIB)