This is a discussion on Com port access in two threads.. within the C Programming forums, part of the General Programming Boards category; I am developing a serial communication utility in VC++, which is Windows console application. I am creating a communication port ...
I am developing a serial communication utility in VC++, which is Windows console application.
I am creating a communication port in main thread. And I use com port handle in main thread and in another thread spawned by main thread.
Do I really need to synchronise com port access in both threads by mutex? What is side effect, if I do not synchronise com port access, in thread spanwned by main thread?
Please let me know.
Well obviously if one thread is writing to the port and suddenly the second begins writing too for instance...you have a problem.
In cases like this, sinchronization is not just an option - it's mandatory! You might check out 'Multithreading Applications in Win32' by Beveridge and Weiner.
Code:int main(void){srand(time(0));for(double l=rand(),l0=0,l00=0;;l0+=0.1){for(double l000=0;l000 <1;l000+=.001,l+=((double)rand()/RAND_MAX)/0x64,l00+=((sin(l*0x8*atan(l0)*l000-(l0*0x8*atan (l)))*0.5)+0.5)){l00-=floor(l00);for(size_t l0000=0,l00000=(size_t)(0x50*(l00));l0000<l00000;++l0000 )putchar(0x20);putchar(0x61+(int)((double)rand()/RAND_MAX*0x1a));putchar('\n');}}return 0;}
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