Hi again, Tim.
Just wondered, if this operation in `muse_atomic_set` can be considered
safe? (i386 case)
`v->counter = i;`
It seems that it can be easily interrupted.
Regards,
Andrew
01.02.2015 05:54, Andrew Deryabin wrote:
Hi Tim,
Just made a check:
------------
Konsole output
gcc -m32 -dM -E -x c /dev/null | grep 386
Konsole output
#define __i386 1
#define __i386__ 1
#define i386 1
------------
------------
Konsole output
clang -m32 -dM -E -x c /dev/null | grep 386
Konsole output
#define __i386 1
#define __i386__ 1
#define i386 1
------------
So it seems, that all of these macros are defined both on gcc and clang.
Regards,
Andrew
31.01.2015 23:58, Tim E. Real wrote:
Hi.
I asked this before but can't remember, I think some said they got
different results:
Can you guys please simply check in the (new) file muse_atomic.h,
and tell me if the sections marked "#ifndef i386" are active?
(I created this file and simply moved some code from another file into it.)
On all my systems (currently KUbuntu, Intel) the "#ifndef i386" sections
have been active (as viewed in KDevelop) for as long as I can remember.
Yet the compiler actually knows about this i386 define - you can see it
in a printout of a simple "test for compile defines" program.
I do not know if the compiler is actually compiling THOSE sections.
I would need to check compiled objects...
Just that KDevelop shows the sections as active.
I want to change the define test to "#ifndef __i386__" which works.
But is that really correct? SHOULD it be i386 not __i386__?
This issue could be important, it means MusE might gain a good
speed boost by using processor atomic features instead of calling
pthread_mutex_lock() !
Tim.
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