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I'm trying to write a program that uses the futex system call. I'm on Ubuntu 10.04.
The problem is that even though I include
#include <linux/futex.h>
the compiler complains that it can not find its declaration. When I open up this header file, I see many macros related to the futex system call, but I can't see any functions defined at all for it (not even do_futex as I've seen at this header file online).
What should I do?
Thanks
Are you getting a compiler error, or a linker error? On my Ubuntu 10.10, trying to call futex() compiles (with an implicit prototype warning) but fails to link. I imagine that means there's a library that's missing, but the man pages don't mention one. You might need some of the fancier dev packages, I suppose.
This is a compiler error that I'm getting. What do you mean by fancier dev packages...? I'm googling it but apparently I'm the first one in the internet with this problem!
Why are you trying to use a futex?
pthread_mutex_t uses them already - including all the "fast path" code that you are responsible for writing yourself when using a futex.
http://linux.die.net/man/7/futex
https://bartoszmilewski.wordpress.co...lock-vs-futex/
gg
thanks for the responses.
i managed to accomplished what i wanted with:
syscall(SYS_futex, &futexVar, FUTEX_WAKE, -999, NULL, NULL, 0);