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Some operating systems may provide for a maximum process niceness level of 20, but this is not supported by all targeted versions; for this reason, we choose 19 as the maximum nice  value that can be set. 

• Solaris : Setting thread_prio  on Solaris sets the Solaris FX priority, with mappings as shown in the following table: 

<img src='content_image/832537.jpg'>

A thread_prio  setting of 9 is mapped on Solaris to the special FX priority value 59, which means that the operating system also attempts to force the thread to run alone on its own CPU core. 

• Windows : We map thread_prio  to a Windows thread priority value passed to the Windows API SetThreadPriority()  function. This mapping is shown in the following table: 

<img src='content_image/832538.jpg'>

