is shared correct kind memory when i allocate memory in AmigaOS4.1? i dont here exact flag name only is "named" is important.

@Vanhapolle

the best thing to do on this question is:

1. read the exec memory allocation section on the developer wiki thoroughly
2. make sure other AOS4 developers see this question by asking at os4coding.net or the developer support forum



-- eliyahu

Last edited by eliyahu on 22-Dec-2014 at 02:46 PM.
Last edited by eliyahu on 22-Dec-2014 at 02:45 PM.

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@Vanhapolle

Quote:

Is shared correct kind memory when i allocate memory in AmigaOS4.1? i dont here exact flag name only is "named" is important.

No, unless you want to share it, then yes.

For AmigaOS4 all memory should be allocated via AllocMemVecTags() system object should be allocated with AllocSysObject() that way the correct memory type is used.

Shared memeory is used if you wat to share memeory between processes, and private memory otherwise. Also to consider is whether the memeory is locked or not shared is locked by defaul ( for backwards comptabilty) but most often doesn't need to be.

Basically allocate all memory as private and unlocked unless you have specific reason not to, such as sharing it between tasks.

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@eliyahu

I cannot wrote at least yet anything i dont own yet os i wait os. Even after this maybe needed do so something which allows writing OS4coding.net. AVT_Contiguous tag is maybe needed also when i use memory area WritePixelArray way? to me is hard
understand how single pointer can tell where my memory is.Someone maybe can tell to me how.

Last edited by Vanhapolle on 23-Dec-2014 at 09:10 AM.

@Vanhapolle

Quote:

Vanhapolle wrote: @eliyahu I cannot wrote at least yet anything i dont own yet os i wait os. Even after this maybe needed do so something which allows writing OS4coding.net. AVT_Contiguous tag is maybe needed also when i use memory area WritePixelArray way? to me is hard understand how single pointer can tell where my memory is.Someone maybe can tell to me how.

No, you don't need AVT_Contiguous tag for memory that you wish to use with WritePixelArray.

As Broadblues said, you should allocate memory as private, unless it's memory that will be shared between tasks (e.g., messages, which you should be allocating with AllocSysObject(), anyway).

Hans

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@Hans

good if want access it this way needs then
value which function returns + (x*bytesperpixel+y*width*bytesperpixel)
where is width is width of picture data,x is x coordinate pixel what i need access,and y is y coordinate pixel what i want address.bytesperpixel is value which tells how many bytes single pixel is. for ARGB its 4 and for RGB is 3 etc.
and formula should be correct one.

I am now really angry becouse i cannot solve this simple thing how i can write and read
values form this memory what i allocated. I hope someone can want help me. even sitll i asked so much.

@Vanhapolle

Not to throw another spoon into the soup but probsbly using MEMF_ANY will suffice.

How have you declared your memory pointer? The following should work fine for example:

unit8 *RGB = image_ptr; // Or...

RGB = AllocVec(RGB_SIZE, MEMF_ANY);

unit red = RGB[];

uint8 green = RGB[1];

uint8 blue = *(RGB + 2);

// Untested.