Was this just a general bitch about how multi-threaded operating systems
function or did you have a real question?
On 20 Jun 2010, at 23:06, BobG wrote:
I finally realized why I cant find a good overview of android
programming tecnique that doesnt assume that the student is a
proficient windows/event driven programmer. Android is a stack on top
of java, which is a stack on top of an operating system, and I betcha
most experienced java programmers have never really wondered what goes
on below the java interpreter. It isnt necessary. Just call the
function, and assume that there are lots of spare mips and megabytes
left on the pc. Us old embedded programmers are painfully aware of the
number of cycles to read a file and/or draw rectangles because weve
probably written every subroutine in a file system and a graphics
package at one time or another. My model is that after oncreate
returns to the operating system, every event that gets delivered to
the activity is sent by the operating system, and the activity gets a
quantum to run, however long that is (100ms?) and one really has no
idea how many ms will elapse until the activity gets to run again.
Horrible for real time stuff like embedded guys are used to. The huge
complex overhead of splitting a simple program that does input,
process, output and runs in a loop into two tasks makes no sense
because both of these tasks are being run by the operating system.
Just more overhead. There doesnt seem to be a way to generate a 50ms
timer event and run a program at a hi priority. Do any android gurus
have an embedded backfround also? I know my lack of 'windows' model
programming hinders my understanding, and I'd be grateful for a link
to some examples that might help. I have no prob generating a timer
interrupt that hits every 100usec on a 20mhz 8 bit microcontroller.
Hard to believe I cant run a program faster than every 100ms on a
500mhz 32 bit arm.
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