TIdThreadPriority Type

Indicates the scheduling priority for a thread.

File

TIdThreadPriority = TThreadPriority;

Description

TIdThreadPriority is an enumerated type used when scheduling the priority of a thread relative to other processes on the local computer system. TIdThreadPriority is a platform-specific enumeration, and contains values pertinent to the operating system or platform.

For the Linux platform, TIdThreadPriority is defined as a numeric enumeration. Each value corresponds to the "niceness" scale, where positive numbers indicate a lower priority.

On the Windows and .Net platforms, TIdThreadPriority is defined as a TThreadPriority type. Windows schedules CPU cycles for each thread based on a priority scale; the Priority property adjusts a thread's priority higher or lower on the scale. TIdThreadPriority can contain one of the following values and meanings:

Value	Meaning
tpIdle	The thread executes only when the system is idle. Windows won't interrupt other threads to execute a thread with tpIdle priority.
tpLowest	The thread's priority is two points below normal.
tpLower	The thread's priority is one point below normal.
tpNormal	The thread has normal priority.
tpHigher	The thread's priority is one point above normal.
tpHighest	The thread's priority is two points above normal.
tpTimeCritical	The thread gets highest priority.

Use SetThreadPriority to adjust the priority of a thread using the platform-specific API calls required.

Notes

Boosting the thread priority of a CPU intensive operation may adversely affect other threads in the application. Only apply priority boosts to threads that spend most of their time waiting for external events.