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00190 #include <cfg/os.h>
00191 #include <cfg/memory.h>
00192
00193 #include <string.h>
00194
00195 #include <sys/types.h>
00196 #include <sys/heap.h>
00197 #include <sys/atom.h>
00198 #include <sys/timer.h>
00199 #include <sys/event.h>
00200 #include <sys/thread.h>
00201
00202 #ifdef NUTDEBUG
00203 #include <sys/osdebug.h>
00204 #endif
00205
00206 #ifdef NUTTRACER
00207 #include <sys/tracer.h>
00208 #endif
00209
00214
00215 #if defined(NUT_CRITICAL_NESTING) && !defined(NUT_CRITICAL_NESTING_STACK)
00216 u_int critical_nesting_level;
00217 #endif
00218
00219 #if defined(__linux__) || defined(__APPLE__) || defined(__CYGWIN__)
00220
00221 extern void NutUnixThreadYieldHook(void);
00222 #endif
00223
00230 NUTTHREADINFO * runningThread;
00231
00238 NUTTHREADINFO * killedThread;
00239
00248 NUTTHREADINFO * nutThreadList;
00249
00257 NUTTHREADINFO * runQueue;
00258
00259
00260
00271 void NutThreadAddPriQueue(NUTTHREADINFO * td, NUTTHREADINFO * volatile *tqpp)
00272 {
00273 NUTTHREADINFO *tqp;
00274
00275 td->td_queue = (HANDLE) tqpp;
00276 td->td_qpec = 0;
00277
00278
00279
00280
00281
00282
00283 NutEnterCritical();
00284 tqp = *tqpp;
00285
00286 if (tqp == SIGNALED) {
00287 tqp = 0;
00288 td->td_qpec++;
00289 } else if (tqp) {
00290 NutExitCritical();
00291
00292
00293 while (tqp && tqp->td_priority <= td->td_priority) {
00294 tqpp = &tqp->td_qnxt;
00295 tqp = tqp->td_qnxt;
00296 }
00297
00298 NutEnterCritical();
00299 }
00300
00301 td->td_qnxt = tqp;
00302
00303 *tqpp = td;
00304 if (td->td_qnxt && td->td_qnxt->td_qpec) {
00305 td->td_qpec += td->td_qnxt->td_qpec;
00306 td->td_qnxt->td_qpec = 0;
00307 }
00308 NutExitCritical();
00309 }
00310
00321 void NutThreadRemoveQueue(NUTTHREADINFO * td, NUTTHREADINFO * volatile *tqpp)
00322 {
00323 NUTTHREADINFO *tqp;
00324
00325 NutEnterCritical();
00326 tqp = *tqpp;
00327 NutExitCritical();
00328
00329 if (tqp != SIGNALED) {
00330 while (tqp) {
00331 if (tqp == td) {
00332 NutEnterCritical();
00333 *tqpp = td->td_qnxt;
00334 if (td->td_qpec) {
00335 if (td->td_qnxt) {
00336 td->td_qnxt->td_qpec = td->td_qpec;
00337 }
00338 td->td_qpec = 0;
00339 }
00340 NutExitCritical();
00341
00342 td->td_qnxt = 0;
00343 td->td_queue = 0;
00344 break;
00345 }
00346 tqpp = &tqp->td_qnxt;
00347 tqp = tqp->td_qnxt;
00348 }
00349 }
00350 }
00351
00362 void NutThreadResume(void)
00363 {
00364 NUTTHREADINFO *td;
00365 NUTTHREADINFO **qhp;
00366 NUTTHREADINFO *tqp;
00367 u_int cnt;
00368
00369
00370
00371
00372 td = nutThreadList;
00373 while (td) {
00374 NutEnterCritical();
00375 cnt = td->td_qpec;
00376 NutExitCritical();
00377 if (cnt) {
00378
00379
00380 qhp = (NUTTHREADINFO **)(td->td_queue);
00381 NutEnterCritical();
00382 td->td_qpec--;
00383 tqp = *qhp;
00384 NutExitCritical();
00385 if (tqp != SIGNALED) {
00386 NutEventPostAsync((HANDLE *)qhp);
00387 }
00388 }
00389 td = td->td_next;
00390 }
00391
00392
00393
00394
00395
00396 NutTimerProcessElapsed();
00397
00398
00399 if (runningThread != runQueue) {
00400 #ifdef NUTTRACER
00401 TRACE_ADD_ITEM(TRACE_TAG_THREAD_YIELD,(int)runningThread);
00402 #endif
00403
00404 if (runningThread->td_state == TDS_RUNNING) {
00405 runningThread->td_state = TDS_READY;
00406 }
00407 NutEnterCritical();
00408 NutThreadSwitch();
00409 NutExitCritical();
00410 }
00411 }
00412
00430 void NutThreadWake(HANDLE timer, HANDLE th)
00431 {
00432
00433 ((NUTTHREADINFO *) th)->td_timer = 0;
00434 ((NUTTHREADINFO *) th)->td_state = TDS_READY;
00435 NutThreadAddPriQueue(th, (NUTTHREADINFO **) & runQueue);
00436 }
00437
00446 void NutThreadYield(void)
00447 {
00448
00449 #if defined(__linux__) || defined(__APPLE__) || defined(__CYGWIN__)
00450 NutEnterCritical();
00451 NutUnixThreadYieldHook();
00452 NutExitCritical();
00453 #endif
00454
00455
00456
00457
00458
00459
00460 if (runningThread->td_qnxt) {
00461 NutThreadRemoveQueue(runningThread, (NUTTHREADINFO **) & runQueue);
00462 NutThreadAddPriQueue(runningThread, (NUTTHREADINFO **) & runQueue);
00463 }
00464
00465
00466 NutThreadResume();
00467 }
00468
00496 uint8_t NutThreadSetPriority(uint8_t level)
00497 {
00498 uint8_t last = runningThread->td_priority;
00499
00500
00501
00502
00503
00504
00505 NutThreadRemoveQueue(runningThread, &runQueue);
00506 runningThread->td_priority = level;
00507 if (level < 255) {
00508 NutThreadAddPriQueue(runningThread, (NUTTHREADINFO **) & runQueue);
00509 } else {
00510 NutThreadKill();
00511 }
00512
00513
00514
00515
00516
00517 if (runningThread == runQueue) {
00518 runningThread->td_state = TDS_RUNNING;
00519 } else {
00520 runningThread->td_state = TDS_READY;
00521 #ifdef NUTTRACER
00522 TRACE_ADD_ITEM(TRACE_TAG_THREAD_SETPRIO,(int)runningThread);
00523 #endif
00524
00525 NutEnterCritical();
00526 NutThreadSwitch();
00527 NutExitCritical();
00528 }
00529
00530 return last;
00531 }
00532
00543 void NutThreadExit(void)
00544 {
00545 NutThreadSetPriority(255);
00546 }
00547
00557 void NutThreadDestroy(void)
00558 {
00559 if (killedThread) {
00560 NutStackFree(killedThread->td_memory);
00561 killedThread = 0;
00562 }
00563 }
00564
00572 void NutThreadKill(void)
00573 {
00574
00575 NUTTHREADINFO *pCur = nutThreadList;
00576 NUTTHREADINFO **pp = (NUTTHREADINFO **) & nutThreadList;
00577
00578
00579 NutThreadDestroy();
00580
00581
00582 while (pCur) {
00583 if (pCur == runningThread) {
00584 *pp = pCur->td_next;
00585 break;
00586 }
00587
00588 pp = (NUTTHREADINFO **) & pCur->td_next;
00589 pCur = pCur->td_next;
00590 }
00591
00592
00593 killedThread = runningThread;
00594 }
00595
00605 HANDLE GetThreadByName(char * name)
00606 {
00607 NUTTHREADINFO *tdp;
00608
00609 for (tdp = nutThreadList; tdp; tdp = tdp->td_next) {
00610 if (strcmp(tdp->td_name, name) == 0)
00611 return tdp;
00612 }
00613 return NULL;
00614 }
00615