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Table of Contents
12-4
Timer Management Internals ............................................................. 197
12-4-1
Timer Management Internals - Timers States .................................. 197
12-4-2
Timer Management Internals - OS_TMR ........................................... 198
12-4-3
Timer Management Internals - Timer Task ....................................... 200
12-4-4
Timer Management Internals - Timer List ......................................... 203
12-5
Summary ............................................................................................ 208
Chapter 13
Resource Management ...................................................................... 209
13-1
Disable/Enable Interrupts .................................................................. 212
13-2
Lock/Unlock ....................................................................................... 214
13-3
Semaphores ....................................................................................... 215
13-3-1
Binary Semaphores ............................................................................ 217
13-3-2
Counting Semaphores ....................................................................... 224
13-3-3
Notes on Semaphores ....................................................................... 226
13-3-4
Semaphore Internals (for resource sharing) ..................................... 227
13-3-5
Priority Inversions .............................................................................. 232
13-4
Mutual Exclusion Semaphores (Mutex) ............................................ 234
13-4-1
Mutual Exclusion Semaphore Internals ............................................ 239
13-5
Should You Use a Semaphore Instead of a Mutex? ........................ 245
13-6
Deadlocks (or Deadly Embrace) ........................................................ 245
13-7
Summary ............................................................................................ 250
Chapter 14
Synchronization ................................................................................. 251
14-1
Semaphores ....................................................................................... 252
14-1-1
Unilateral Rendezvous ....................................................................... 254
14-1-2
Credit Tracking ................................................................................... 257
14-1-3
Multiple Tasks Waiting on a Semaphore .......................................... 259
14-1-4
Semaphore Internals (for synchronization) ....................................... 260
14-2
Task Semaphore ................................................................................ 267
14-2-1
Pending (i.e., Waiting) on a Task Semaphore ................................... 268
14-2-2
Posting (i.e., Signaling) a Task Semaphore ...................................... 269
14-2-3
Bilateral Rendezvous ......................................................................... 271
14-3
Event Flags ......................................................................................... 273
14-3-1
Using Event Flags .............................................................................. 275
14-3-2
Event Flags Internals ......................................................................... 279
14-4
Synchronizing Multiple Tasks ............................................................ 286
14-5
Summary ............................................................................................ 288
6
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