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#include <revolution.h>
#include <revolution/os.h>
void OSInitMessageQueue(OSMessageQueue* mq, void* msgArray, s32 msgCount) {
OSInitThreadQueue(&mq->queueSend);
OSInitThreadQueue(&mq->queueReceive);
mq->msgArray = msgArray;
mq->msgCount = msgCount;
mq->firstIndex = 0;
mq->usedCount = 0;
}
int OSSendMessage(OSMessageQueue* mq, void* msg, s32 flags) {
BOOL enabled;
s32 lastIndex;
enabled = OSDisableInterrupts();
while(mq->msgCount <= mq->usedCount) {
if (!(flags & 1)) {
OSRestoreInterrupts(enabled);
return 0;
}
OSSleepThread(&mq->queueSend);
}
lastIndex = (mq->firstIndex + mq->usedCount) % mq->msgCount;
((u32*)mq->msgArray)[lastIndex] = (u32)msg;
mq->usedCount++;
OSWakeupThread(&mq->queueReceive);
OSRestoreInterrupts(enabled);
return 1;
}
int OSReceiveMessage(OSMessageQueue* mq, void* msg, s32 flags) {
BOOL enabled = OSDisableInterrupts();
while(mq->usedCount == 0) {
if (!(flags & 1)) {
OSRestoreInterrupts(enabled);
return 0;
}
OSSleepThread(&mq->queueReceive);
}
if(msg != NULL) {
*(u32*)msg = ((u32*)mq->msgArray)[mq->firstIndex];
}
mq->firstIndex = (mq->firstIndex + 1) % mq->msgCount;
mq->usedCount--;
OSWakeupThread(&mq->queueSend);
OSRestoreInterrupts(enabled);
return 1;
}
int OSJamMessage(OSMessageQueue* mq, void* msg, s32 flags) {
BOOL enabled = OSDisableInterrupts();
while(mq->msgCount <= mq->usedCount) {
if(!(flags & 1)) {
OSRestoreInterrupts(enabled);
return 0;
}
OSSleepThread(&mq->queueSend);
}
mq->firstIndex = (mq->firstIndex + mq->msgCount - 1) % mq->msgCount;
((u32*)mq->msgArray)[mq->firstIndex] = (u32)msg;
mq->usedCount++;
OSWakeupThread(&mq->queueReceive);
OSRestoreInterrupts(enabled);
return 1;
}
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