alThunk.c

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#include "config.h"

#include <stdlib.h>

#include "alMain.h"
#include "alThunk.h"


static ALenum *ThunkArray;
static ALuint  ThunkArraySize;
static RWLock  ThunkLock;

void ThunkInit(void)
{
    RWLockInit(&ThunkLock);
    ThunkArraySize = 1;
    ThunkArray = calloc(1, ThunkArraySize * sizeof(*ThunkArray));
}

void ThunkExit(void)
{
    free(ThunkArray);
    ThunkArray = NULL;
    ThunkArraySize = 0;
}

ALenum NewThunkEntry(ALuint *index)
{
    ALenum *NewList;
    ALuint i;

    ReadLock(&ThunkLock);
    for(i = 0;i < ThunkArraySize;i++)
    {
        if(ExchangeInt(&ThunkArray[i], AL_TRUE) == AL_FALSE)
        {
            ReadUnlock(&ThunkLock);
            *index = i+1;
            return AL_NO_ERROR;
        }
    }
    ReadUnlock(&ThunkLock);

    WriteLock(&ThunkLock);
    NewList = realloc(ThunkArray, ThunkArraySize*2 * sizeof(*ThunkArray));
    if(!NewList)
    {
        WriteUnlock(&ThunkLock);
        ERR("Realloc failed to increase to %u entries!\n", ThunkArraySize*2);
        return AL_OUT_OF_MEMORY;
    }
    memset(&NewList[ThunkArraySize], 0, ThunkArraySize*sizeof(*ThunkArray));
    ThunkArraySize *= 2;
    ThunkArray = NewList;

    ThunkArray[i] = AL_TRUE;
    WriteUnlock(&ThunkLock);

    *index = i+1;
    return AL_NO_ERROR;
}

void FreeThunkEntry(ALuint index)
{
    ReadLock(&ThunkLock);
    if(index > 0 && index <= ThunkArraySize)
        ExchangeInt(&ThunkArray[index-1], AL_FALSE);
    ReadUnlock(&ThunkLock);
}