Ian Appru wrote:
The boost library's shared_ptr project requires a conditional increment like
inline int atomic_conditional_increment( int * pw )
{
// if( *pw != 0 ) ++*pw;
// return *pw;
}
I'd like to extend shared_ptr to support sparc v8+ processors using the sun
studio compiler (v5.7 and above) using an atomic operation - the current
implementation uses pthreads mutexes and so doesn't scale that well.
While atomic increment/decrements (using cas) are suffiently well documented
for me to be pretty confident in my implementation I would apreciate any input
for an atomic conditional increment.
This message posted from opensolaris.org
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man atomic_inc_32
<assuming your code is correct as written>
inline int atomic_conditional_increment(int * pw )
{
if (*pw)
return (atomic_inc_32(pw));
else
return (0);
}
- Bart
--
Bart Smaalders Solaris Kernel Performance
[EMAIL PROTECTED] http://blogs.sun.com/barts
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