NOTE

Linux IO

Buffered IO, Direct IO, mmap

Buffered IO

Page Cache 頁緩存

ARM Processor

SSE, OOE, Pipeline, Von Neumann, Harvard, Cortex, SoC, Affinity

AArch64 Instruction Set

RISC, ARM, Registers, Instruction, Stack Frame

RISC (Reduced Instruction Set Computer)

• 相較於 CISC (complex instruction set computer)
• David Patterson…

Semiconductor Note

PN Semiconductor、Diode、BJT、JFET、MOSFET、CMOS、IC

半導體 Semiconductor

Kalman Filter

卡爾曼濾波器的原理和應用

What is Kalman Filter

• 卡爾曼濾波器能夠從時間序列中不完全、包含雜訊的測量中…

POSIX Timer

SIGEV_SIGNAL/SIGEV_THREAD

Signals

sigev_notify

SIGEV_NONE: Do nothing. I can use timer_gettime() and timer_getoverrun() to query.

SIGEV_SIGNAL: When timer expire, the kernel…

C++ Cast

static_cast, dynamic_cast, const_cast, reinterpret_cast

Why C++ has four different casts, but in C only has one?

• Inheritance
• Templates

C++ Smart Pointer

unique_ptr, shared_ptr, weak_ptr

Smart Pointer

• 避免 new 出來的記憶體，忘記 delete，然後也沒有 pointer 指到它，導致 memory leak。
• 為了解決這個問題，C++11 提供了幾種不同的 Smart pointer，自動做 Garbage Collection 的動作。