Hi!

libusb(x) links to libpthread:

$ ldd /lib/x86_64-linux-gnu/libusb-1.0.so.0
linux-vdso.so.1 =>
librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6
/lib64/ld-linux-x86-64.so.2

If I'm linking to libusb(x), the resulting executable also links to libpthread.

Looking at the libusbx source code (and API documentation) reveals, that they don't use threading, they only use the mutexes (pthread_mutex_*) and condition variables (pthread_cond_*).

Is it necessary to have the unit "CThreads" in my Uses clause?

Thanks
Hansi

2012/10/1 Johann Glaser :

Is it necessary to have the unit "CThreads" in my Uses clause?

No, only if you use threads in your pascal code.