On 06/11/2009 01:35 AM, Greg wrote:
One final thought / question / observation along the same lines...
This is what got me started on this line of thinking / research...
I have experimented with posix threads and find repeatedly that even a
multi-threaded application yields results the same
as if I have coded a non-multi-threaded application.
If I need to give examples, I shall later, but basicly, I code with pthreads.h
in C a simple counting thread which reports
its thread number and the count. I then set main to spawn multiple threads, and
in the threads, each has a random sleep in
between printfs to show the thread / count.
I even put in flushes to make sure the results weren't due to a printf
buffering issue.
Each and every result was of a thread counting in sequence before going to the
next thread. No sleep states were put in
the main program. It simple spawned a bunch of threads back to back, and then waited for
them to "join".
Is this normal? I thought even under a uniprocessor machine the threads were to
time-slice like on a multicore.
No, it's not normal. That means the code you wrote has bugs :)
