5 replies to this topic

[WingedPanther]

lock isn't a keyword in C/C++. Are you trying to apply an ASM concept?

[dargueta]

The thread library you're using should provide some sort of mutex construction. Look at the documentation to see. Are you using pthreads or Windows API to create your threads? I can help you with either.

As far as the C construction for lock, there is none unless you're absolutely sure that your program will run only on Intel processors. In this case you'll have to write your increment instruction entirely in ASM, but that depends on the compiler. On a Microsoft compiler you can do this:

//32-bit processors only
__asm    lock inc    myvar;
//32- and 64-bit processors
__asm    lock add    myvar,1;

I forget the exact syntax for GNU GCC, but it's something like:

asm("lock add    myvar,1;","","");

Don't quote me on that.

Also, make sure you declare that variable as volatile.

Edited by dargueta, 11 September 2009 - 04:26 AM.
Fixed formatting

[dargueta]

Wow.