exit_group - exit all threads in a process
void exit_group(int status);
This system call is equivalent to _exit(2) except that it terminates not
only the calling thread, but all threads in the calling process's thread
This system call does not return.
This call is present since Linux 2.5.35.
This call is Linux-specific.
Since glibc 2.3, this is the system call invoked when the _exit(2)
wrapper function is called.
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