tailieunhanh - HandBooks Professional Java-C-Scrip-SQL part 211

Tham khảo tài liệu 'handbooks professional java-c-scrip-sql part 211', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | recursive Refers to software that calls itself. Recursion should generally be avoided in an embedded system because it frequently requires a large stack. reentrant Refers to software that can be executed multiple times simultaneously. A reentrant function can be safely called recursively or from multiple tasks. The key to making code reentrant is to ensure mutual exclusion whenever accessing global variables or shared registers. register A memory location that is part of a processor or a peripheral. In other words it s not normal memory. Generally each bit or set of bits within the register controls some behavior of the larger device. relocatable A file containing object code that is almost ready for execution on the target. The final step is to use a locator to fix the remaining relocatable addresses within the code. The result of that process is an executable. reset address The address from which the first instruction will be fetched after the processor is powered on or reset. reset code A small piece of code that is placed at the reset address. The reset code is usually written in assembly language and might simply be the equivalent of jump to the startup code. reset vector See reset address. S SRAM Static Random-Access Memory. A type of RAM that retains its contents as long as power is supplied to it. Data stored in an SRAM is lost when the system is powered down or reset. scheduler The part of an operating system that decides which task to run next. This decision is based on the readiness of each task their relative priorities and the specific scheduling algorithm implemented. semaphore A data structure that is used for intertask communication. Semaphores are usually provided by the operating system. simulator A debugging tool that runs on the host and pretends to be the target processor. A simulator can be used to test pieces of the software before the embedded hardware is available. Unfortunately attempts to simulate interactions with complex peripherals are