Linux kernel : thread group
1. POSIX-compliant multithreaded applications are best handled by kernels that support "thread group".
2. In linux, a thread group is basically a set of lightweight processes that implement a multithreaded application and act as a whole with regards to some system calls such as getpid(), kill() and _exit().
3. Examples of POSIX-compliant pthread libraries that use linux's lightweight processes are : LinuxThreads, Native POSIX Thread Library ( NPTL), IBM's Next Generation Posix Threading Package( NGPT).
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