62 linhas
1.1 KiB
C
62 linhas
1.1 KiB
C
#include "yakk.h"
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#include "clib.h"
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#include "PriorityQueue.h"
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extern PriorityQueue readyQueue;
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YKSEM* YKSemCreate(int initialValue) {
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YKSEM* newSemaphore;
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newSemaphore = getNewSem();
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if (newSemaphore == null) exit(NEW_SEM_FAILED);
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initializePriorityQueue(&(newSemaphore->queue));
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newSemaphore->value = initialValue;
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return newSemaphore;
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}
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void YKSemPend(YKSEM* semaphore) {
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TCB* runningTask;
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YKEnterMutex();
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if (semaphore->value < 1) {
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semaphore->value--;
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runningTask = removePriorityQueue(&readyQueue);
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runningTask->state = T_BLOCKED;
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insertPriorityQueue((&(semaphore->queue)), runningTask);
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YKExitMutex();
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asm("int 0x20");
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return;
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} else {
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semaphore->value--;
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YKExitMutex();
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return;
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}
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}
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void YKSemPost(YKSEM* semaphore) {
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TCB* readyTask;
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YKEnterMutex();
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semaphore->value++;
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readyTask = removePriorityQueue(&(semaphore->queue));
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if (readyTask == null) {
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YKExitMutex();
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return;
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}
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readyTask->state = T_READY;
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insertPriorityQueue(&readyQueue, readyTask);
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YKExitMutex();
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if (YKGetISRCallDepth() == 0) {
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asm("int 0x20");
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}
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return;
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}
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