read thread high CPU usage on linux(centos 7)

[itas109]

Describe the bug
read thread high CPU usage on linux(centos 7)

To Reproduce
compile and run examples\CommNoGui\CSerialPortDemoNoGui
run top or htop command

$ htop

CPU[|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||100.0%]   Tasks: 40, 59 thr; 1 running

   PID USER      PRI  NI  VIRT   RES   SHR S CPU% MEM%   TIME+  Command
12165 root     20   0 14980  2884  2684 R 99.1  0.1  0:26.62 ./CSerialPortDemoNoGui

Desktop (please complete the following information):

• OS: centos 7.6 x86_64
• Compiler: gcc 4.8.5
• Version: 4.1.0.201010

[itas109]

use sleep could solve high cpu usage problem.
for(;;) is better than while(true)

for(;;)
{
    //do sth.
    usleep(1);
}