Signal Delivery
Signal delivery became much more complicated with the advent of multithreaded processes. The kernel has to support the old paradigm of delivering a signal to a process as well as to deliver the signal to a particular thread within the process. Signal delivery is further complicated because the interface to the kill() system call is complicated—a pretty good feat for a system call with only two arguments.
The kill() system call is the way a process sends a signal. The first argument is the PID of the process to which the signal should be sent, and the second argument is the number of the signal to send. The complication comes from the PID argument, which can take on values other than an actual PID. If the specified PID is zero, ...
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