sockets - How to I make UDP and TCP flows simultaneously without multi-thread program -

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my program following

sender side:

while(1){    sendto(); // send data packets    usleep(); // delay avoid overflow }

receiver side:

while(1){    recvfrom(); // receive }

i have tcp socket appeared in receiver while loop, send control message (to change time of usleep) receiver side sender side every 2 seconds( or every 100 received packets). in mean while, sender should able listen control message in while loop. can achieved without multi-thread program?


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