c++ - "printf" appears to be non-deterministic in Qt? -

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i know "printf" standard-c , should deterministic. when run in qt see more non-deterministic response(clock cycles). due qt adding "pork" response?

i have multiple threads make call function uses mutex. when 1 thread enters set switch others can't until done. things appeared work ok acouple seconds , threads appeared killed off 10 1 thread. tried adding delay: (k=k+1: no help), (looping k=k+1: no help), (usleep works), , (printf) work @ creating random delay , allowing threads continue running.

void ccb::write(int ithread) {     static bool buse = false;     bool bdone = false;     char cstr[20];     int poswrite;// = *m_poswrite;  // issue of poswrite altered next extrance     long k = 0;     long m = 0;     m_threadcount++;      while(bdone == false){          if(buse == false){             buse = true;             poswrite = *m_poswrite;              memcpy(m_cmmessagecb + poswrite, &m_cmmessagewrite, sizeof(typecanmessage));              memset(cstr, '\0', 20);             memcpy(cstr, (m_cmmessagecb + poswrite)->cmessage, 11); //fails: every 20              *m_poswrite = *m_poswrite + 1;             if(*m_poswrite == m_inbufferlength)                 *m_poswrite = 0;              bdone = true;             buse = false;          }else if(buse == true){             //why threads being killed ?     //            printf("t%d_%d ", ithread, m_threadcount);//non-deterministic value ?             usleep(1);//non-deterministic value             //k++;//delay of couple clock cycles not enough              /*             for(k = 0; k < ithread * 100; k++){//deterministic , fails resolve thread problem                 m++;             }             */         }     } }


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