- FreeBSD Device Drivers
- About the Technical Reviewer
- Foreword
- Acknowledgments
- Introduction
- 1. Building and Running Modules
- 2. Allocating Memory
- 3. Device Communication and Control
- 4. Thread Synchronization
- A Simple Synchronization Problem
- A More Complex Synchronization Problem
- Preventing Race Conditions
- Mutexes
- Mutex Management Routines
- Implementing Mutexes
- Shared/Exclusive Locks
- Shared/Exclusive Lock Management Routines
- Implementing Shared/Exclusive Locks
- Reader/Writer Locks
- Reader/Writer Lock Management Routines
- Condition Variables
- Condition Variable Management Routines
- General Guidelines
- Conclusion
- 5. Delaying Execution
- 6. Case Study: Virtual Null Modem
- 7. Newbus and Resource Allocation
- 8. Interrupt Handling
- 9. Case Study: Parallel Port Printer Driver
- Code Analysis
- lpt_identify Function
- lpt_probe Function
- lpt_detect Function
- lpt_port_test Function
- lpt_attach Function
- lpt_detach Function
- lpt_open Function
- lpt_read Function
- lpt_write Function
- lpt_intr Function
- lpt_timeout Function
- lpt_push_bytes Function
- lpt_close Function
- lpt_ioctl Function
- lpt_request_ppbus Function
- lpt_release_ppbus Function
- Conclusion
- Code Analysis
- 10. Managing and Using Resources
- 11. Case Study: Intelligent Platform Management Interface Driver
- 12. Direct Memory Access
- 13. Storage Drivers
- 14. Common Access Method
- 15. USB Drivers
- About USB Devices
- More About USB Devices
- USB Configuration Structures
- USB Transfers (in FreeBSD)
- USB Configuration Structure Management Routines
- USB Methods Structure
- Tying Everything Together
- ulpt_probe Function
- ulpt_attach Function
- ulpt_detach Function
- ulpt_open Function
- ulpt_reset Function
- unlpt_open Function
- ulpt_close Function
- ulpt_ioctl Function
- ulpt_watchdog Function
- ulpt_start_read Function
- ulpt_stop_read Function
- ulpt_start_write Function
- ulpt_stop_write Function
- ulpt_write_callback Function
- ulpt_read_callback Function
- ulpt_status_callback Function
- Conclusion
- 16. Network Drivers, Part 1: Data Structures
- 17. Network Drivers, Part 2: Packet Reception and Transmission
- References
- Index
- About the Author
- Colophon
- A. UPDATES
This chapter covered the four different methods for delaying execution:
| Sleeping Sleeping is done when you must wait for something to occur before you can proceed. |
| Event Handlers Event handlers let you register one or more functions to be executed when an event occurs. |
| Callouts Callouts let you perform asyn chronous code execution. Callouts are used to execute your functions at a specific time. |
| Taskqueues Taskqueues also let you perform asynchronous code execution. Taskqueues are used for deferred work. |
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