Real-Time Embedded Multithreading Using ThreadX and MIPS- P1 potx

... 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

... retrieves performance information about the specifi ed memory block pool. NOTE : The ThreadX library and application must be built with TX_BLOCK_POOL_ ENABLE_PERFORMANCE_INFO defi ned for this ... service retrieves performance information about the specifi ed memory byte pool. NOTE : The ThreadX library and application must be built with TX_BYTE_POOL_ENABLE_ PERFORMANCE_INFO defi n...

Ngày tải lên: 03/07/2014, 05:20

... the “my_stack_error_handler” function with ThreadX so that thread stack errors can be handled by the application. */ status ϭ tx_thread_stack_error_notify(my_stack_error_handler); /* If status ... tx_thread_stack_error_notify( VOID (*error_handler) (TX_THREAD *)); Description This service registers a notifi cation callback function for handling thread stack errors. When ThreadX de...

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

... 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

... 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

... 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

... defi nition for Speedy_Thread using a block of memory for its stack. Develop a defi nition for Slow_Thread using a block of memory for its stack, and then compile and execute the resulting system. ... allocating and releasing memory blocks is fast and predictable. In general, we recommend the use of memory block pools for deterministic, real-time applications. 9.26 Key Terms...

Ngày tải lên: 03/07/2014, 05:20

... declarations and the other additions to the declarations and defi nitions section of the program. /* Declare the application timer */ TX_TIMER stats_timer; /* Declare the counters and accumulators ... tx_timer_interrupt.c , and tx_timer_interrupt.s . 10.14 Overview The internal system clock is essential for capturing timing information, as illustrated by the sample program i...

Ngày tải lên: 03/07/2014, 05:20