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The man page for pthreads mentions:
POSIX.1 also requires that threads share a range of other attributes
(i.e., these attributes are process-wide rather than per-thread):
...
- signal dispositions
...
What do “signal dispositions” mean?
I signal disposition is the action a process takes when a signal is delivered. Each signal has a disposition. There are defaults.
From signal(7):
Signal Dispositions Each signal has a current disposition, which determines how the process behaves when it is delivered the signal. [Dispositions are:] Term Default action is to terminate the process. Ign Default action is to ignore the signal. Core Default action is to terminate the process and dump core (see core(5)). Stop Default action is to stop the process. Cont Default action is to continue the process if it is currently stopped. [...] The signal disposition is a per-process attribute: in a multithreaded application, the disposition of a particular signal is the same for all threads.