The signal behaviour required for POSIX threads is available by specifying the CLONE_SIGHAND flag to clone(2). This is what the glibc pthreads implementation d

The signal behaviour required for POSIX threads is available by specifying the CLONE_SIGHAND flag to clone(2). This is what the glibc pthreads implementation does. Linux did once have a pthreads implementation that wasn't POSIX-conforming in these sorts of areas ("LinuxThreads"), but those days are long behind us. NPTL has been the standard for at least 10 years now.