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futex - how/where?

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I figured I could experiment somewhat with futexes (futices?), as I do have lots of synchronisation in the project I'm currently involved with. I hit the wall pretty quick, namely: 1. I don't know where the headers are, I know about <linux/futex.h>, but I'm not sure if it's not exclusively for kernel developers 2. Even if I use the aforementioned header, I get undefined references - I have no idea what library to link agains. I tried googling, but I was flooded with worthless techno babble. Any help?

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There isn't really a userland API for futexes (futexen?)

The NPTL pthreads implementation's mutex objects are lightweight wrappers around futexes, so there isn't really much advantage to writing your own, unless you're trying to come up with a new IPC layer or you gain profound physical pleasure from self-inflicted pain.

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Quote:
Original post by Bregma
The NPTL pthreads implementation's mutex objects are lightweight wrappers around futexes


Ugh. I didn't know that...
Is NPTL the default implementation in latest unix systems? (Or does it depend on the kernel? I certainly lack knowledge in this area).

On the other hand, I program on embeeded devices, so pthread implementation might differ, which might force me to implement the synchronisation primitives myself (but I doubt it will come to that, and no, I don't enjoy inflicting pain on myself).

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