Real time embedded multithreading

... computers, and medical 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 ... www.verypdf.com to remove this watermark Embedded and Real-time Systems 1.7 Architecture of Real-time Systems The architecture of a real-time system determines how and when...

Ngày tải lên: 03/07/2014, 05:20

... of ThreadX service call data types and their associated meanings In addition to the primitive data types, ThreadX uses system data types to define and declare system resources, such as threads and ... Thread has a higher priority and becomes ready for execution ThreadX then interrupts Thread and gives Thread control of the processor When Thread completes its work, ThreadX ret...

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 designs using ... of time and without losing any accuracy of ThreadX time-related features 5.5 Key Terms and Phrases Cause Register CISC code density Compare Register Count Register Error M...

Ngày tải lên: 03/07/2014, 05:20

... instruction of the 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 ... r e s s c o m Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark MIPS Exception Handling 65 (by application calls to ThreadX services), ThreadX creates a...

Ngày tải lên: 03/07/2014, 05:20

... process of continually executing and scheduling threads is the most common type of program execution in ThreadX applications Interrupts are the cornerstone of real-time systems Without interrupts, ... selects and removes the thread in that list that has the highest priority and which has been waiting the longest If an executing thread is interrupted for any reason, its context is sa...

Ngày tải lên: 03/07/2014, 05:20

... purchase PDF Split-Merge on www.verypdf.com to remove this watermark Mutual Exclusion Challenges and Considerations 125 Suppose a mutex has the priority-inheritance option enabled and a thread ... capabilities, pitfalls, and services for each type We will also create illustrative sample systems using these resources w w w.ne w nespress.com Please purchase PDF Split-Merge on www.v...

Ngày tải lên: 03/07/2014, 05:20

... Furthermore, 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 and Phrases allocation ... a definition for Speedy_Thread using a block of memory for its stack Develop a definition for Slow_Thread using a block of memory for its stack, and then compile and...

Ngày tải lên: 03/07/2014, 05:20

... remove this watermark Internal System Clock and Application Timers 163 /* Declare the application timer */ TX_TIMER stats_timer; /* Declare the counters and accumulators */ ULONG Speedy_Thread_counter ... for both the Speedy_Thread and the Slow_Thread To accomplish this, we need two variables for each of the two threads: one to store the total time spent in the cycle, and one to coun...

Ngày tải lên: 03/07/2014, 05:20

... compare the results of thread processing by using a mutex versus using a binary semaphore w w w.ne w nespress.com Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark 188 Chapter ... protect critical sections in Activities and for the Speedy_Thread, and Activities and for the Slow_Thread We will show only the changes for the Speedy_Thread and will leave t...

Ngày tải lên: 03/07/2014, 05:20

... 0x111 (i.e., event flags 0, 4, and 8) and use the TX _AND option Figure 12.18 illustrates this operation Set option Description TX _AND The specified event flags are ANDed into the current event ... returned The previous example uses the TX _AND and the TX _AND_ CLEAR get_options We will consider another example that illustrates the effect of the TX_OR and the TX_ OR_ CLEAR get_option...

Ngày tải lên: 03/07/2014, 05:20

... clear event flags using the tx_event_flags_set service and get them (wait on them) by using the tx_event_flags_get service The clearing or setting of event flags entails a logical TX _AND or TX_OR operation ... { /* Put system definitions here, e.g., thread and event flags group creates */ w w w.ne w nespress.com Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark...

Ngày tải lên: 03/07/2014, 05:20

... empty and another thread is suspended because it is waiting for a message, then that message bypasses the queue entirely and goes directly to the destination specified by the other thread ThreadX ... case study based on an application that could use both the ThreadX RTOS and the ARM processor The application we will consider is a real-time video/audio/motion (VAM) recording system...

Ngày tải lên: 03/07/2014, 05:20

... initialization and to process routine data 14.4 Design of the System Our design will be simplified and will concentrate on control issues In this section, we will consider thread design issues, and public ... other processes will handle4 the actual storing and copying of data 14.4.1 Thread Design We need a thread to perform various initialization duties such as setting pointers and v...

Ngày tải lên: 03/07/2014, 05:20

... Services J Application Timer Services K ThreadX API ThreadX is a registered trademark of Express Logic, Inc The ThreadX API, associated data structures, and data types are copyrights of Express ... ThreadX. 1 Every service is described here, including purpose, parameters, return values, and examples Following is a list of the services discussed in the appendices Appendix K contains...

Ngày tải lên: 03/07/2014, 05:20

... service retrieves performance information about the specified memory block pool NOTE: The ThreadX library and application must be built with TX_BLOCK_POOL_ ENABLE_PERFORMANCE_INFO defined for this ... on www.verypdf.com to remove this watermark Memory Block Pool Services A-11 NOTE: The ThreadX library and application must be built with TX_BLOCK_POOL_ENABLE_ PERFORMANCE_INFO defined for...

Ngày tải lên: 03/07/2014, 05:20