Complex sentence: The LinuxThreads project used this system call to simulate thread support entirely in userland; unfortunately, it had a number of issues with true POSIX compliance, particularly in the areas of signal handling, scheduling, and inter-process synchronization primitives.
Split into simpler sentences: The LinuxThreads project used this system call to simulate thread support entirely in userland. Unfortunately, it had a number of issues with true POSIX compliance, particularly in the areas of signal handling, scheduling, and inter-process synchronization primitives.