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In computer programming, thread-local storage (TLS) is a memory management method that uses static or global memory local to a thread. The concept allows storage of data that appears to be global in a system with separate threads.
Kernel threads are preemptively multitasked if the operating system's process scheduler is preemptive. Kernel threads do not own resources except for a stack, a copy of the registers including the program counter, and thread-local storage (if any), and are thus relatively cheap to create and destroy. Thread switching is also relatively cheap ...
TLS—Thread-Local Storage; TLS—Transport Layer Security; TLV—Type—length—value; tmp—temporary; TNC—Terminal Node Controller; TNC—Threaded Neill-Concelman connector; TPF—Transaction Processing Facility; TPM—Trusted Platform Module; TROFF—Trace Off; TRON—Trace On; TRON—The Real-time Operating system Nucleus
The stack is often used to store variables of fixed length local to the currently active functions. Programmers may further choose to explicitly use the stack to store local data of variable length. If a region of memory lies on the thread's stack, that memory is said to have been allocated on the stack, i.e. stack-based memory allocation (SBMA).
Pauses CPU thread for a short time period. [h] Intended for use in spinlocks. [i] CLFSH [j] Cache Line Flush. CLFLUSH m8: NP 0F AE /7: Flush one cache line to memory. In a system with multiple cache hierarchy levels and/or multiple processors each with their own caches, the line is flushed from all of them. 3 (SSE2), Geode LX: MONITOR [k]
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Thread-local storage Variables are localized so that each thread has its own private copy. These variables retain their values across subroutine and other code boundaries and are thread-safe since they are local to each thread, even though the code which accesses them might be executed simultaneously by another thread. Immutable objects
Current Linux also uses GS to point to thread-local storage. Segments can be defined to be either code, data, or system segments. Additional permission bits are present to make segments read only, read/write, execute, etc. In protected mode, code may always modify all segment registers except CS (the code segment selector). This is because the ...