allocate()

audio_block_t * AudioStream::allocate ( void  )

staticprotectedinherited

Definition at line 92 of file AudioStream.cpp.

{
    uint32_t n, index, avail;
    uint32_t *p, *end;
    audio_block_t *block;
    uint32_t used;
 
    p = memory_pool_available_mask;
    end = p + NUM_MASKS;
    __disable_irq();
    index = memory_pool_first_mask;
    p += index;
    while (1) {
        if (p >= end) {
            __enable_irq();
            //Serial.println("alloc:null");
            return NULL;
        }
        avail = *p;
        if (avail) break;
        index++;
        p++;
    }
    n = __builtin_clz(avail);
    avail &= ~(0x80000000 >> n);
    *p = avail;
    if (!avail) index++;
    memory_pool_first_mask = index;
    used = memory_used + 1;
    memory_used = used;
    __enable_irq();
    index = p - memory_pool_available_mask;
    block = memory_pool + ((index << 5) + (31 - n));
    block->ref_count = 1;
    if (used > memory_used_max) memory_used_max = used;
    //Serial.print("alloc:");
    //Serial.println((uint32_t)block, HEX);
    return block;
}

References AudioStream::memory_pool, AudioStream::memory_pool_available_mask, AudioStream::memory_pool_first_mask, AudioStream::memory_used, AudioStream::memory_used_max, p, and audio_block_struct::ref_count.

Referenced by AudioStream::receiveWritable(), AudioSynthWaveformhd::update(), and AudioSynthWaveformModulated2k::update().

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