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Chapter 9 Event Flag Management

Chapter 9 Event Flag Management. Event Flags Overview. Event flags are used when a task needs to synchronize with the occurrence of multiple events. The task can be synchronized when any of the events have occurred. disjunctive synchronization (logical OR).

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530 views • 35 slides

Chapter 8 Mutual Exclusion Semaphores

Chapter 8 Mutual Exclusion Semaphores. Mutual exclusion semaphores (mutexes) are used by tasks to gain exclusive access to resources It is a binary semaphores Use to reduce the priority inversion problem

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339 views • 18 slides

Chapter 11 Message Queue Management

Chapter 11 Message Queue Management. Message Queue. A message queue allows a task or an ISR to send pointer-sized variables to another task Each pointer typically is initialized to point to some application-specific data structure containing a message Seven services to access message queues

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469 views • 18 slides

Chapter7 Semaphore Management

Chapter7 Semaphore Management. Semaphores. Create a semaphore by calling OSSemCreate() The initial count of the semaphore can be 0 to 65535 Use to signal the occurrence of one ore more event, the init value is 0 (flag) Use to access a shared resource, the init value is set to 1 (binary) (key)

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334 views • 11 slides

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Tasks waiting - PowerPoint PPT Presentation

Chapter 9 Event Flag Management

Chapter 8 Mutual Exclusion Semaphores

Chapter 11 Message Queue Management

Chapter7 Semaphore Management