begriffs open source - cmsis-freertos/blob - Source/portable/MSVC-MingW/port.c

1 /*

4

5 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.

6

7 This file is part of the FreeRTOS distribution.

8

9 FreeRTOS is free software; you can redistribute it and/or modify it under

10 the terms of the GNU General Public License (version 2) as published by the

11 Free Software Foundation >>>> AND MODIFIED BY <<<< the FreeRTOS exception.

12

13 ***************************************************************************

14 >>! NOTE: The modification to the GPL is included to allow you to !<<

15 >>! distribute a combined work that includes FreeRTOS without being !<<

16 >>! obliged to provide the source code for proprietary components !<<

17 >>! outside of the FreeRTOS kernel. !<<

18 ***************************************************************************

19

20 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY

21 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

22 FOR A PARTICULAR PURPOSE. Full license text is available on the following

23 link: http://www.freertos.org/a00114.html

24

25 ***************************************************************************

26 * *

27 * FreeRTOS provides completely free yet professionally developed, *

28 * robust, strictly quality controlled, supported, and cross *

29 * platform software that is more than just the market leader, it *

30 * is the industry's de facto standard. *

31 * *

32 * Help yourself get started quickly while simultaneously helping *

33 * to support the FreeRTOS project by purchasing a FreeRTOS *

34 * tutorial book, reference manual, or both: *

35 * http://www.FreeRTOS.org/Documentation *

36 * *

37 ***************************************************************************

38

39 http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading

40 the FAQ page "My application does not run, what could be wrong?". Have you

41 defined configASSERT()?

42

43 http://www.FreeRTOS.org/support - In return for receiving this top quality

44 embedded software for free we request you assist our global community by

45 participating in the support forum.

46

47 http://www.FreeRTOS.org/training - Investing in training allows your team to

48 be as productive as possible as early as possible. Now you can receive

49 FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers

50 Ltd, and the world's leading authority on the world's leading RTOS.

51

52 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,

53 including FreeRTOS+Trace - an indispensable productivity tool, a DOS

54 compatible FAT file system, and our tiny thread aware UDP/IP stack.

55

56 http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.

57 Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.

58

59 http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High

60 Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS

61 licenses offer ticketed support, indemnification and commercial middleware.

62

63 http://www.SafeRTOS.com - High Integrity Systems also provide a safety

64 engineered and independently SIL3 certified version for use in safety and

65 mission critical applications that require provable dependability.

66

67 1 tab == 4 spaces!

68 */

69

70 /* Standard includes. */

71 #include <stdio.h>

72

73 /* Scheduler includes. */

74 #include "FreeRTOS.h"

75 #include "task.h"

76

77 #ifdef __GNUC__

78 #include "mmsystem.h"

79 #else

80 #pragma comment(lib, "winmm.lib")

81 #endif

82

83 #define portMAX_INTERRUPTS ( ( uint32_t ) sizeof( uint32_t ) * 8UL ) /* The number of bits in an uint32_t. */

84 #define portNO_CRITICAL_NESTING ( ( uint32_t ) 0 )

85

86 /* The priorities at which the various components of the simulation execute.

87 Priorities are higher when a soak test is performed to lessen the effect of

88 Windows interfering with the timing. */

89 #define portSOAK_TEST

90 #ifndef portSOAK_TEST

91 #define portDELETE_SELF_THREAD_PRIORITY THREAD_PRIORITY_HIGHEST /* Must be highest. */

92 #define portSIMULATED_INTERRUPTS_THREAD_PRIORITY THREAD_PRIORITY_NORMAL

93 #define portSIMULATED_TIMER_THREAD_PRIORITY THREAD_PRIORITY_BELOW_NORMAL

94 #define portTASK_THREAD_PRIORITY THREAD_PRIORITY_IDLE

95 #else

96 #define portDELETE_SELF_THREAD_PRIORITY THREAD_PRIORITY_TIME_CRITICAL /* Must be highest. */

97 #define portSIMULATED_INTERRUPTS_THREAD_PRIORITY THREAD_PRIORITY_HIGHEST

98 #define portSIMULATED_TIMER_THREAD_PRIORITY THREAD_PRIORITY_ABOVE_NORMAL

99 #define portTASK_THREAD_PRIORITY THREAD_PRIORITY_NORMAL

100 #endif

101 /*

102 * Created as a high priority thread, this function uses a timer to simulate

103 * a tick interrupt being generated on an embedded target. In this Windows

104 * environment the timer does not achieve anything approaching real time

105 * performance though.

106 */

107 static DWORD WINAPI prvSimulatedPeripheralTimer( LPVOID lpParameter );

108

109 /*

110 * Process all the simulated interrupts - each represented by a bit in

111 * ulPendingInterrupts variable.

112 */

113 static void prvProcessSimulatedInterrupts( void );

114

115 /*

116 * Interrupt handlers used by the kernel itself. These are executed from the

117 * simulated interrupt handler thread.

118 */

119 static uint32_t prvProcessYieldInterrupt( void );

120 static uint32_t prvProcessTickInterrupt( void );

121

122 /*

123 * Called when the process exits to let Windows know the high timer resolution

124 * is no longer required.

125 */

126 static BOOL WINAPI prvEndProcess( DWORD dwCtrlType );

127

128 /*-----------------------------------------------------------*/

129

130 /* The WIN32 simulator runs each task in a thread. The context switching is

131 managed by the threads, so the task stack does not have to be managed directly,

132 although the task stack is still used to hold an xThreadState structure this is

133 the only thing it will ever hold. The structure indirectly maps the task handle

134 to a thread handle. */

135 typedef struct

136 {

137 /* Handle of the thread that executes the task. */

138 void *pvThread;

139

140 } xThreadState;

141

142 /* Simulated interrupts waiting to be processed. This is a bit mask where each

143 bit represents one interrupt, so a maximum of 32 interrupts can be simulated. */

144 static volatile uint32_t ulPendingInterrupts = 0UL;

145

146 /* An event used to inform the simulated interrupt processing thread (a high

147 priority thread that simulated interrupt processing) that an interrupt is

148 pending. */

149 static void *pvInterruptEvent = NULL;

150

151 /* Mutex used to protect all the simulated interrupt variables that are accessed

152 by multiple threads. */

153 static void *pvInterruptEventMutex = NULL;

154

155 /* The critical nesting count for the currently executing task. This is

156 initialised to a non-zero value so interrupts do not become enabled during

157 the initialisation phase. As each task has its own critical nesting value

158 ulCriticalNesting will get set to zero when the first task runs. This

159 initialisation is probably not critical in this simulated environment as the

160 simulated interrupt handlers do not get created until the FreeRTOS scheduler is

161 started anyway. */

162 static uint32_t ulCriticalNesting = 9999UL;

163

164 /* Handlers for all the simulated software interrupts. The first two positions

165 are used for the Yield and Tick interrupts so are handled slightly differently,

166 all the other interrupts can be user defined. */

167 static uint32_t (*ulIsrHandler[ portMAX_INTERRUPTS ])( void ) = { 0 };

168

169 /* Pointer to the TCB of the currently executing task. */

170 extern void *pxCurrentTCB;

171

172 /* Used to ensure nothing is processed during the startup sequence. */

173 static BaseType_t xPortRunning = pdFALSE;

174

175 /*-----------------------------------------------------------*/

176

177 static DWORD WINAPI prvSimulatedPeripheralTimer( LPVOID lpParameter )

178 {

179 TickType_t xMinimumWindowsBlockTime;

180 TIMECAPS xTimeCaps;

181

182 /* Set the timer resolution to the maximum possible. */

183 if( timeGetDevCaps( &xTimeCaps, sizeof( xTimeCaps ) ) == MMSYSERR_NOERROR )

184 {

185 xMinimumWindowsBlockTime = ( TickType_t ) xTimeCaps.wPeriodMin;

186 timeBeginPeriod( xTimeCaps.wPeriodMin );

187

188 /* Register an exit handler so the timeBeginPeriod() function can be

189 matched with a timeEndPeriod() when the application exits. */

190 SetConsoleCtrlHandler( prvEndProcess, TRUE );

191 }

192 else

193 {

194 xMinimumWindowsBlockTime = ( TickType_t ) 20;

195 }

196

197 /* Just to prevent compiler warnings. */

198 ( void ) lpParameter;

199

200 for( ;; )

201 {

202 /* Wait until the timer expires and we can access the simulated interrupt

203 variables. *NOTE* this is not a 'real time' way of generating tick

204 events as the next wake time should be relative to the previous wake

205 time, not the time that Sleep() is called. It is done this way to

206 prevent overruns in this very non real time simulated/emulated

207 environment. */

208 if( portTICK_PERIOD_MS < xMinimumWindowsBlockTime )

209 {

210 Sleep( xMinimumWindowsBlockTime );

211 }

212 else

213 {

214 Sleep( portTICK_PERIOD_MS );

215 }

216

217 configASSERT( xPortRunning );

218

219 WaitForSingleObject( pvInterruptEventMutex, INFINITE );

220

221 /* The timer has expired, generate the simulated tick event. */

222 ulPendingInterrupts |= ( 1 << portINTERRUPT_TICK );

223

224 /* The interrupt is now pending - notify the simulated interrupt

225 handler thread. */

226 if( ulCriticalNesting == 0 )

227 {

228 SetEvent( pvInterruptEvent );

229 }

230

231 /* Give back the mutex so the simulated interrupt handler unblocks

232 and can access the interrupt handler variables. */

233 ReleaseMutex( pvInterruptEventMutex );

234 }

235

236 #ifdef __GNUC__

237 /* Should never reach here - MingW complains if you leave this line out,

238 MSVC complains if you put it in. */

239 return 0;

240 #endif

241 }

242 /*-----------------------------------------------------------*/

243

244 static BOOL WINAPI prvEndProcess( DWORD dwCtrlType )

245 {

246 TIMECAPS xTimeCaps;

247

248 ( void ) dwCtrlType;

249

250 if( timeGetDevCaps( &xTimeCaps, sizeof( xTimeCaps ) ) == MMSYSERR_NOERROR )

251 {

252 /* Match the call to timeBeginPeriod( xTimeCaps.wPeriodMin ) made when

253 the process started with a timeEndPeriod() as the process exits. */

254 timeEndPeriod( xTimeCaps.wPeriodMin );

255 }

256

257 return pdPASS;

258 }

259 /*-----------------------------------------------------------*/

260

261 StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t pxCode, void *pvParameters )

262 {

263 xThreadState *pxThreadState = NULL;

264 int8_t *pcTopOfStack = ( int8_t * ) pxTopOfStack;

265 const SIZE_T xStackSize = 1024; /* Set the size to a small number which will get rounded up to the minimum possible. */

266

267 #ifdef portSOAK_TEST

268 {

269 /* Ensure highest priority class is inherited. */

270 if( !SetPriorityClass( GetCurrentProcess(), REALTIME_PRIORITY_CLASS ) )

271 {

272 printf( "SetPriorityClass() failed\r\n" );

273 }

274 }

275 #endif

276

277 /* In this simulated case a stack is not initialised, but instead a thread

278 is created that will execute the task being created. The thread handles

279 the context switching itself. The xThreadState object is placed onto

280 the stack that was created for the task - so the stack buffer is still

281 used, just not in the conventional way. It will not be used for anything

282 other than holding this structure. */

283 pxThreadState = ( xThreadState * ) ( pcTopOfStack - sizeof( xThreadState ) );

284

285 /* Create the thread itself. */

286 pxThreadState->pvThread = CreateThread( NULL, xStackSize, ( LPTHREAD_START_ROUTINE ) pxCode, pvParameters, CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION, NULL );

287 configASSERT( pxThreadState->pvThread ); /* See comment where TerminateThread() is called. */

288 SetThreadAffinityMask( pxThreadState->pvThread, 0x01 );

289 SetThreadPriorityBoost( pxThreadState->pvThread, TRUE );

290 SetThreadPriority( pxThreadState->pvThread, portTASK_THREAD_PRIORITY );

291

292 return ( StackType_t * ) pxThreadState;

293 }

294 /*-----------------------------------------------------------*/

295

296 BaseType_t xPortStartScheduler( void )

297 {

298 void *pvHandle;

299 int32_t lSuccess = pdPASS;

300 xThreadState *pxThreadState;

301

302 /* Install the interrupt handlers used by the scheduler itself. */

303 vPortSetInterruptHandler( portINTERRUPT_YIELD, prvProcessYieldInterrupt );

304 vPortSetInterruptHandler( portINTERRUPT_TICK, prvProcessTickInterrupt );

305

306 /* Create the events and mutexes that are used to synchronise all the

307 threads. */

308 pvInterruptEventMutex = CreateMutex( NULL, FALSE, NULL );

309 pvInterruptEvent = CreateEvent( NULL, FALSE, FALSE, NULL );

310

311 if( ( pvInterruptEventMutex == NULL ) || ( pvInterruptEvent == NULL ) )

312 {

313 lSuccess = pdFAIL;

314 }

315

316 /* Set the priority of this thread such that it is above the priority of

317 the threads that run tasks. This higher priority is required to ensure

318 simulated interrupts take priority over tasks. */

319 pvHandle = GetCurrentThread();

320 if( pvHandle == NULL )

321 {

322 lSuccess = pdFAIL;

323 }

324

325 if( lSuccess == pdPASS )

326 {

327 if( SetThreadPriority( pvHandle, portSIMULATED_INTERRUPTS_THREAD_PRIORITY ) == 0 )

328 {

329 lSuccess = pdFAIL;

330 }

331 SetThreadPriorityBoost( pvHandle, TRUE );

332 SetThreadAffinityMask( pvHandle, 0x01 );

333 }

334

335 if( lSuccess == pdPASS )

336 {

337 /* Start the thread that simulates the timer peripheral to generate

338 tick interrupts. The priority is set below that of the simulated

339 interrupt handler so the interrupt event mutex is used for the

340 handshake / overrun protection. */

341 pvHandle = CreateThread( NULL, 0, prvSimulatedPeripheralTimer, NULL, CREATE_SUSPENDED, NULL );

342 if( pvHandle != NULL )

343 {

344 SetThreadPriority( pvHandle, portSIMULATED_TIMER_THREAD_PRIORITY );

345 SetThreadPriorityBoost( pvHandle, TRUE );

346 SetThreadAffinityMask( pvHandle, 0x01 );

347 ResumeThread( pvHandle );

348 }

349

350 /* Start the highest priority task by obtaining its associated thread

351 state structure, in which is stored the thread handle. */

352 pxThreadState = ( xThreadState * ) *( ( size_t * ) pxCurrentTCB );

353 ulCriticalNesting = portNO_CRITICAL_NESTING;

354

355 /* Bump up the priority of the thread that is going to run, in the

356 hope that this will assist in getting the Windows thread scheduler to

357 behave as an embedded engineer might expect. */

358 ResumeThread( pxThreadState->pvThread );

359

360 /* Handle all simulated interrupts - including yield requests and

361 simulated ticks. */

362 prvProcessSimulatedInterrupts();

363 }

364

365 /* Would not expect to return from prvProcessSimulatedInterrupts(), so should

366 not get here. */

367 return 0;

368 }

369 /*-----------------------------------------------------------*/

370

371 static uint32_t prvProcessYieldInterrupt( void )

372 {

373 return pdTRUE;

374 }

375 /*-----------------------------------------------------------*/

376

377 static uint32_t prvProcessTickInterrupt( void )

378 {

379 uint32_t ulSwitchRequired;

380

381 /* Process the tick itself. */

382 configASSERT( xPortRunning );

383 ulSwitchRequired = ( uint32_t ) xTaskIncrementTick();

384

385 return ulSwitchRequired;

386 }

387 /*-----------------------------------------------------------*/

388

389 static void prvProcessSimulatedInterrupts( void )

390 {

391 uint32_t ulSwitchRequired, i;

392 xThreadState *pxThreadState;

393 void *pvObjectList[ 2 ];

394 CONTEXT xContext;

395

396 /* Going to block on the mutex that ensured exclusive access to the simulated

397 interrupt objects, and the event that signals that a simulated interrupt

398 should be processed. */

399 pvObjectList[ 0 ] = pvInterruptEventMutex;

400 pvObjectList[ 1 ] = pvInterruptEvent;

401

402 /* Create a pending tick to ensure the first task is started as soon as

403 this thread pends. */

404 ulPendingInterrupts |= ( 1 << portINTERRUPT_TICK );

405 SetEvent( pvInterruptEvent );

406

407 xPortRunning = pdTRUE;

408

409 for(;;)

410 {

411 WaitForMultipleObjects( sizeof( pvObjectList ) / sizeof( void * ), pvObjectList, TRUE, INFINITE );

412

413 /* Used to indicate whether the simulated interrupt processing has

414 necessitated a context switch to another task/thread. */

415 ulSwitchRequired = pdFALSE;

416

417 /* For each interrupt we are interested in processing, each of which is

418 represented by a bit in the 32bit ulPendingInterrupts variable. */

419 for( i = 0; i < portMAX_INTERRUPTS; i++ )

420 {

421 /* Is the simulated interrupt pending? */

422 if( ulPendingInterrupts & ( 1UL << i ) )

423 {

424 /* Is a handler installed? */

425 if( ulIsrHandler[ i ] != NULL )

426 {

427 /* Run the actual handler. */

428 if( ulIsrHandler[ i ]() != pdFALSE )

429 {

430 ulSwitchRequired |= ( 1 << i );

431 }

432 }

433

434 /* Clear the interrupt pending bit. */

435 ulPendingInterrupts &= ~( 1UL << i );

436 }

437 }

438

439 if( ulSwitchRequired != pdFALSE )

440 {

441 void *pvOldCurrentTCB;

442

443 pvOldCurrentTCB = pxCurrentTCB;

444

445 /* Select the next task to run. */

446 vTaskSwitchContext();

447

448 /* If the task selected to enter the running state is not the task

449 that is already in the running state. */

450 if( pvOldCurrentTCB != pxCurrentTCB )

451 {

452 /* Suspend the old thread. */

453 pxThreadState = ( xThreadState *) *( ( size_t * ) pvOldCurrentTCB );

454 SuspendThread( pxThreadState->pvThread );

455

456 /* Ensure the thread is actually suspended by performing a

457 synchronous operation that can only complete when the thread is

458 actually suspended. The below code asks for dummy register

459 data. */

460 xContext.ContextFlags = CONTEXT_INTEGER;

461 ( void ) GetThreadContext( pxThreadState->pvThread, &xContext );

462

463 /* Obtain the state of the task now selected to enter the

464 Running state. */

465 pxThreadState = ( xThreadState * ) ( *( size_t *) pxCurrentTCB );

466 ResumeThread( pxThreadState->pvThread );

467 }

468 }

469

470 ReleaseMutex( pvInterruptEventMutex );

471 }

472 }

473 /*-----------------------------------------------------------*/

474

475 void vPortDeleteThread( void *pvTaskToDelete )

476 {

477 xThreadState *pxThreadState;

478 uint32_t ulErrorCode;

479

480 /* Remove compiler warnings if configASSERT() is not defined. */

481 ( void ) ulErrorCode;

482

483 /* Find the handle of the thread being deleted. */

484 pxThreadState = ( xThreadState * ) ( *( size_t *) pvTaskToDelete );

485

486 /* Check that the thread is still valid, it might have been closed by

487 vPortCloseRunningThread() - which will be the case if the task associated

488 with the thread originally deleted itself rather than being deleted by a

489 different task. */

490 if( pxThreadState->pvThread != NULL )

491 {

492 WaitForSingleObject( pvInterruptEventMutex, INFINITE );

493

494 /* !!! This is not a nice way to terminate a thread, and will eventually

495 result in resources being depleted if tasks frequently delete other

496 tasks (rather than deleting themselves) as the task stacks will not be

497 freed. */

498 ulErrorCode = TerminateThread( pxThreadState->pvThread, 0 );

499 configASSERT( ulErrorCode );

500

501 ulErrorCode = CloseHandle( pxThreadState->pvThread );

502 configASSERT( ulErrorCode );

503

504 ReleaseMutex( pvInterruptEventMutex );

505 }

506 }

507 /*-----------------------------------------------------------*/

508

509 void vPortCloseRunningThread( void *pvTaskToDelete, volatile BaseType_t *pxPendYield )

510 {

511 xThreadState *pxThreadState;

512 void *pvThread;

513 uint32_t ulErrorCode;

514

515 /* Remove compiler warnings if configASSERT() is not defined. */

516 ( void ) ulErrorCode;

517

518 /* Find the handle of the thread being deleted. */

519 pxThreadState = ( xThreadState * ) ( *( size_t *) pvTaskToDelete );

520 pvThread = pxThreadState->pvThread;

521

522 /* Raise the Windows priority of the thread to ensure the FreeRTOS scheduler

523 does not run and swap it out before it is closed. If that were to happen

524 the thread would never run again and effectively be a thread handle and

525 memory leak. */

526 SetThreadPriority( pvThread, portDELETE_SELF_THREAD_PRIORITY );

527

528 /* This function will not return, therefore a yield is set as pending to

529 ensure a context switch occurs away from this thread on the next tick. */

530 *pxPendYield = pdTRUE;

531

532 /* Mark the thread associated with this task as invalid so

533 vPortDeleteThread() does not try to terminate it. */

534 pxThreadState->pvThread = NULL;

535

536 /* Close the thread. */

537 ulErrorCode = CloseHandle( pvThread );

538 configASSERT( ulErrorCode );

539

540 /* This is called from a critical section, which must be exited before the

541 thread stops. */

542 taskEXIT_CRITICAL();

543

544 ExitThread( 0 );

545 }

546 /*-----------------------------------------------------------*/

547

548 void vPortEndScheduler( void )

549 {

550 /* This function IS NOT TESTED! */

551 TerminateProcess( GetCurrentProcess(), 0 );

552 }

553 /*-----------------------------------------------------------*/

554

555 void vPortGenerateSimulatedInterrupt( uint32_t ulInterruptNumber )

556 {

557 configASSERT( xPortRunning );

558

559 if( ( ulInterruptNumber < portMAX_INTERRUPTS ) && ( pvInterruptEventMutex != NULL ) )

560 {

561 /* Yield interrupts are processed even when critical nesting is

562 non-zero. */

563 WaitForSingleObject( pvInterruptEventMutex, INFINITE );

564 ulPendingInterrupts |= ( 1 << ulInterruptNumber );

565

566 /* The simulated interrupt is now held pending, but don't actually

567 process it yet if this call is within a critical section. It is

568 possible for this to be in a critical section as calls to wait for

569 mutexes are accumulative. */

570 if( ulCriticalNesting == 0 )

571 {

572 SetEvent( pvInterruptEvent );

573 }

574

575 ReleaseMutex( pvInterruptEventMutex );

576 }

577 }

578 /*-----------------------------------------------------------*/

579

580 void vPortSetInterruptHandler( uint32_t ulInterruptNumber, uint32_t (*pvHandler)( void ) )

581 {

582 if( ulInterruptNumber < portMAX_INTERRUPTS )

583 {

584 if( pvInterruptEventMutex != NULL )

585 {

586 WaitForSingleObject( pvInterruptEventMutex, INFINITE );

587 ulIsrHandler[ ulInterruptNumber ] = pvHandler;

588 ReleaseMutex( pvInterruptEventMutex );

589 }

590 else

591 {

592 ulIsrHandler[ ulInterruptNumber ] = pvHandler;

593 }

594 }

595 }

596 /*-----------------------------------------------------------*/

597

598 void vPortEnterCritical( void )

599 {

600 if( xPortRunning == pdTRUE )

601 {

602 /* The interrupt event mutex is held for the entire critical section,

603 effectively disabling (simulated) interrupts. */

604 WaitForSingleObject( pvInterruptEventMutex, INFINITE );

605 ulCriticalNesting++;

606 }

607 else

608 {

609 ulCriticalNesting++;

610 }

611 }

612 /*-----------------------------------------------------------*/

613

614 void vPortExitCritical( void )

615 {

616 int32_t lMutexNeedsReleasing;

617

618 /* The interrupt event mutex should already be held by this thread as it was

619 obtained on entry to the critical section. */

620

621 lMutexNeedsReleasing = pdTRUE;

622

623 if( ulCriticalNesting > portNO_CRITICAL_NESTING )

624 {

625 if( ulCriticalNesting == ( portNO_CRITICAL_NESTING + 1 ) )

626 {

627 ulCriticalNesting--;

628

629 /* Were any interrupts set to pending while interrupts were

630 (simulated) disabled? */

631 if( ulPendingInterrupts != 0UL )

632 {

633 configASSERT( xPortRunning );

634 SetEvent( pvInterruptEvent );

635

636 /* Mutex will be released now, so does not require releasing

637 on function exit. */

638 lMutexNeedsReleasing = pdFALSE;

639 ReleaseMutex( pvInterruptEventMutex );

640 }

641 }

642 else

643 {

644 /* Tick interrupts will still not be processed as the critical

645 nesting depth will not be zero. */

646 ulCriticalNesting--;

647 }

648 }

649

650 if( pvInterruptEventMutex != NULL )

651 {

652 if( lMutexNeedsReleasing == pdTRUE )

653 {

654 configASSERT( xPortRunning );

655 ReleaseMutex( pvInterruptEventMutex );

656 }

657 }

658 }

659 /*-----------------------------------------------------------*/

660