Mutithread variable share Topic is solved

[leon_titan]

Code: Select all


bool start = false;

// thread 1
static THD_WORKING_AREA(waThread1, 128);
static THD_FUNCTION(Thread1, arg) {
   while(true) {
      uprintf(": %u\n", start);
   }
}

// main thread
void somefunc() {
   start = true;
}



How to share variables between threads? I use the code above but the value of "start" is changed not as expected. When I change the start to true, the print is like:

Code: Select all

:1
:1
:1
:1
:0
:0
:0
:0
...


Why and how to do that correct?

[Giovanni]

Hi,

Make the variable "volatile" or the compiled will optimize it out.

Giovanni

[leon_titan]

Got it. Thx for reply.

[leon_titan]

after add volatile still got the same result

[Giovanni]

I don't see enough code for an explanation. It is possible that thread is starving the others, there are no sleep functions called inside the loop.

Giovanni