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https://stackoverflow.com/questions/10833317/pthread-threads-and-signals
May 31, 2012 · I am using pthread library under Linux for creating threads and I have two questions about signal handling in such applications. I know that signal handlers are process-wide, which means that if I set handler in process every thread will have this signal handler, also I know that there is pthread_kill function for sending signals to particular threads.
https://www.linuxjournal.com/article/3985
May 01, 2000 · An interesting signal-delivery case, however, is on SMP. Imagine a thread is executing on one processor, and it gets an asynchronous event (e.g., synchronous socket I/O signal) from an IRQ handler (or another process) on another CPU. In that case, we send a cross-CPU message to the running process, so there is no latency in signal delivery.
https://unix.stackexchange.com/questions/225687/what-happens-to-a-multithreaded-linux-process-if-it-gets-a-signal
The entry in POSIX on "Signal Generation and Delivery" in "Rationale: System Interfaces General Information" saysSignals generated for a process are delivered to only one thread. Thus, if more than one thread is eligible to receive a signal, one has to be chosen.
https://www.linuxprogrammingblog.com/all-about-linux-signals?page=show
If there is no signal handler defined for the signal and the default action is to terminate the process with or without dumping the core the whole process is terminated. Thread-directed signals. There is a special function to send a signal to a specific thread: pthread_kill(2). It can be used to send a signal from one thread to another (or itself).
https://linux.die.net/man/7/signal
signal(7) - Linux man page Name. signal - overview of signals ... a process can elect one of the following behaviors to occur on delivery of the signal: perform the default action; ... then the kernel chooses an arbitrary thread to which to deliver the signal. A thread can obtain the set of signals that it currently has pending using sigpending ...
http://man7.org/linux/man-pages/man7/signal.7.html
SIGNAL(7) Linux Programmer's Manual SIGNAL(7) ... a process can elect one of the following behaviors to occur on delivery of the signal: perform the ... A thread- directed signal is one that is targeted at a specific thread. A signal may be thread-directed because it was generated as a consequence of executing a specific ...
https://devopedia.org/linux-signals
Signal mask can be set using sigprocmask (single-threaded) or pthread_sigmask (multi-threaded). When a process has multiple threads, a signal can be blocked on a per thread basis. Signal will be delivered to any one thread that hasn't blocked it. Essentially, Signal handlers are per process, signal masks are per thread.
https://www.ibm.com/support/knowledgecenter/en/ssw_aix_71/kernelextension/kern_proc_sign_exc_handl.html?origURL=ssw_aix_71/com.ibm.aix.kernextc/kern_proc_sign_exc_handl.htm
See Thread Signal Handling for more information on signal handling by threads. Signals whose action is applied at generation time (rather than delivery time) have the same effect regardless of whether the target is a kernel or user process. A kernel process can poll for unmasked signals that are waiting to be delivered by calling the sig_chk ...
http://poincare.matf.bg.ac.rs/~ivana/courses/ps/sistemi_knjige/pomocno/apue/APUE/0201433079/ch12lev1sec8.html
In the POSIX.1 thread model, asynchronous signals are sent to a process, and then an individual thread within the process is selected to receive the signal, based on which threads are not currently blocking the signal. On Linux, an asynchronous signal is sent to a particular thread, and since each thread executes as a separate process, the ...
https://www.unix.com/unix-for-dummies-questions-and-answers/123045-sending-signal-child-parent-process.html
When executing a call that is not async-signal safe you get undefined results when a second signal hits a signal handler that is currently executing that function. ie., if the function call works it is purely by accident not design. printf is a large chunk of code made from a lot of functions and system calls. write() is a single base system ...
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