How to generate truly random numbers across multiple charts in the same terminal?

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I have 4 charts setup with my EA on an MT4 terminal. A portion of the code needs to generate a random number, which will then be used as the interval for a timer. This is done to prevent the 4 charts from writing to a particular terminal global variable at the same time. This is my code to initialise random number generator.

int OnInit()
  {
//---
   
   MathSrand(GetTickCount());

//---
   return(INIT_SUCCEEDED);
  }

Then I use this to generate a random number between 1,000 and 10,000 and use it as the interval for a millisecond timer.

int timerinterval;

do
 {
    timerinterval=MathRand();
 }
 while((timerinterval<1000) || (timerinterval>10000));

 EventSetMillisecondTimer(timerinterval);

I call this function once every M15 bar. The problem is throughout the day multiple times I can see two of the four charts getting the same 4 digit number for timerinterval, which defeats the purpose. So my question is whether there is a way to generate truly random numbers across multiple charts running the same EA in a single terminal.

 
Tony A Antony: prevent the 4 charts from writing to a particular terminal global variable at the same time.

Use a Mutex for that.
          Prevent EA from opening trades at the same time across 2 or more pairs? - MQL4 programming forum - Page%nbsp;2 #11 (2022)

 
William Roeder #:

Use a Mutex for that.
          Prevent EA from opening trades at the same time across 2 or more pairs? - MQL4 programming forum - Page%nbsp;2 #11 (2022)

Thank you for pointing me in the right direction. I have replied on that thread with a query. Please go through it.

 
Tony A Antony:


code:

int timerinterval;

do
 {
    timerinterval=MathRand();
 }
 while((timerinterval<1000) || (timerinterval>10000));

is equivalent to code

int timerinterval = 1000 + ((rand()<<15)|rand())%9000;
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