NOTE
Linux Threads
Thread execution, shared process resources, scheduling, stacks, TLS, and synchronization.
This is a historical learning note and may contain outdated or incomplete understanding.
Threads within a process share resources such as the address space and many file/process attributes while each has its own execution state and stack. POSIX threads are represented by schedulable kernel tasks using Linux’s internal mechanisms.
Threads make shared-memory communication cheap but require synchronization around mutable shared state. Performance depends on runnable-thread count, blocking behavior, contention, cache locality, and scheduler decisions.
The exact clone flags and task structures are implementation details; program against pthread/runtime semantics.