Real-Time Embedded Multithreading Using ThreadX and MIPS- P20 doc

... service retrieves performance information about the specifi ed semaphore. NOTE : The ThreadX library and application must be built with TX_SEMAPHORE_ENABLE_ PERFORMANCE_INFO defi ned for this ... retrieves performance information about all the semaphores in the system. NOTE : The ThreadX library and application must be built with TX_SEMAPHORE_ENABLE_ PERFORMANCE_INFO defi ned for...

Ngày tải lên: 03/07/2014, 05:20

... interrupt-handling software no longer has to determine which interrupt source caused the interrupt. 6.2 ThreadX Implementation of MIPS Exception Handling ThreadX is a popular RTOS for embedded ... interrupt processing, and others are for handling program exceptions. The EXL, ERL, and UM of the Status Register defi ne the current processor mode. Figure 5.8 shows these values a...

Ngày tải lên: 03/07/2014, 05:20

... other threads, create priority inversion, reduce processing bandwidth, and make the application’s run-time behavior diffi cult to understand. If thread starvation is a problem, an application can ... thread has priority 15 and a preemption-threshold of 0, will another thread with priority 5 be able to preempt it? 10 Explain the difference between time-slicing and cooperative multithr...

Ngày tải lên: 03/07/2014, 05:20

... Services J Application Timer Services K ThreadX API 1 ThreadX is a registered trademark of Express Logic, Inc. The ThreadX API, associated data structures, and data types are copyrights of Express ... Service name and brief description Prototype Prototype showing service name, parameter order, and data types Description Detailed information about the service Input P...

Ngày tải lên: 03/07/2014, 05:20

... an internal counter is incremented and a successful status is returned. If the mutex is owned by another thread and the calling thread has higher priority and priority inheritance was enabled ... retrieves performance information about the specifi ed mutex. www.newnespress.com NOTE : The ThreadX library and application must be built with TX_MUTEX_ENABLE_ PERFORMANCE_INFO defi ned...

Ngày tải lên: 03/07/2014, 05:20

... performance information about all the queues in the system. www.newnespress.com NOTE : The ThreadX library and application must be built with TX_QUEUE_ENABLE_ PERFORMANCE_INFO defi ned for this service ... retrieves performance information about the specifi ed queue. www.newnespress.com NOTE : The ThreadX library and application must be built with TX_QUEUE_ENABLE_ PERFORMANCE_INFO...

Ngày tải lên: 03/07/2014, 05:20

... equipment. 2 1.2 What is an Embedded System? In recent years, the line between embedded and nonembedded systems has blurred, largely because embedded systems have expanded to a vast array of ... control to ThreadX (and does not return!). ThreadX performs initialization of various internal data structures and then processes the application defi nitions and the thread ent...

Ngày tải lên: 03/07/2014, 05:20

... variety of services to the developer of real-time embedded systems. These services allow the developer to create, manipulate, and manage system resources and entities in order to facilitate application ... has a higher priority and becomes ready for execution. ThreadX then interrupts Thread 1 and gives Thread 2 control of the processor. When Thread 2 completes its work, Thr...

Ngày tải lên: 03/07/2014, 05:20

... thread. 6.2.3 ThreadX Interrupt Handling ThreadX provides basic handling for all MIPS program exceptions and interrupts. The ThreadX program exception handlers are small spin loops that enable ... $26,_tx_exception_handler # Pickup exception handler address j $26 # Jump to exception handler nop # Delay slot These instructions jump to _tx_exception_handler , the ThreadX MIPS exc...

Ngày tải lên: 03/07/2014, 05:20

... allocates and deallocates from a memory block pool — it always allocates and deallocates at the head of the available list. This provides the fastest possible linked list processing and might ... Memory Block Pools Allocating memory in a fast and deterministic manner is essential in real-time applications. This is made possible by creating and managing multiple pools of fi xed...

Ngày tải lên: 03/07/2014, 05:20