FeatureμC/OS-IIμC/OS-III

Release Date(發(fā)布時(shí)間)	1999–present	2009–present
Preemptive Multitasking(搶先多任務(wù)處理)	?	?
Maximum number of tasks(最大任務(wù)數(shù))	255	Unlimited
Number?of?tasks?at?each?priority?level(每個(gè)優(yōu)先級(jí)的任務(wù)數(shù)量)	1	Unlimited
Round robin scheduling(輪轉(zhuǎn)調(diào)度)	?	?
Semaphores(信號(hào))	?	?
Mutual exclusion semaphores(互斥信號(hào)量)	?	? (Nestable)
Event flags(事件標(biāo)志)	?	?
Message mailboxes(消息郵箱)	?	No (not needed)
Message queues(消息隊(duì)列)	?	?
Fixed sized memory management(固定大小的內(nèi)存管理)	?	?
Signal a task without requiring a semaphore(在不需要信號(hào)量的情況下給任務(wù)發(fā)送信號(hào))	?	?
Option to post without scheduling(沒有發(fā)布調(diào)度選項(xiàng))	?	?
Send messages to a task without requiring a message queue(不需要消息隊(duì)列就可以向任務(wù)發(fā)送消息)	?	?
Software timers(軟件定時(shí)器)	?	?
Task suspend/resume(任務(wù)掛起/恢復(fù))	?	? (Nestable)
Deadlock prevention(預(yù)防死鎖)	?	?
Scalable(可擴(kuò)展性)	?	?
Code footprint(代碼的足跡)	6K to 26K	6K to 24K
Data footprint(數(shù)據(jù)足跡)	1K+	1K+
ROMable(可只讀存儲(chǔ)器化)	?	?
Run-time configurable(運(yùn)行時(shí)配置)	?	?
Compile-time configurable(編譯時(shí)可配置)	?	?
ASCII names for each kernel object(每個(gè)內(nèi)核對(duì)象的ASCII名稱)	?	?
Pend on multiple objects(花費(fèi)在多個(gè)對(duì)象上)	?	?
Task registers(任務(wù)的寄存器)	?	?
Built-in performance measurements(內(nèi)置性能測(cè)量)	Limited	Extensive
User definable hook functions(用戶可定義的鉤子函數(shù))	?	?
Time stamps on posts(郵政時(shí)間戳)	?	?
Built-in kernel awareness support(內(nèi)置內(nèi)核感知支持)	?	?
Optimizable scheduler in assembly language(可優(yōu)化的匯編語言調(diào)度程序)	?	?
Catch a task that returns(捕獲返回的任務(wù))	?	?
Tick handling at task level(在任務(wù)級(jí)別處理滴答)	?	?
Dynamic tick rate(動(dòng)態(tài)嘀嗒頻率)	?	?
Source code available(源代碼開源)	?	?
Number of services(數(shù)量的服務(wù))	~90	~70
MISRA-C:1998	? (except 10 rules)	N/A
MISRA-C:2012	?	? (except 8 advisory and 8 required guidelines)
DO178B Level A and EUROCAE ED-12B	?	?
Medical FDA pre-market notification (510(k)) and pre-market approval (PMA)	?	?
SIL3/SIL4 IEC for transportation and nuclear systems	?	?
IEC-61508()	?	?

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