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| OPENMP API Specification: Version 5.0 November 2018

1.2.1  Threading Concepts

thread
An execution entity with a stack and associated static memory, called threadprivate memory.

OpenMP thread
A thread that is managed by the OpenMP implementation.

thread number
A number that the OpenMP implementation assigns to an OpenMP thread. For threads within the same team, zero identifies the master thread and consecutive numbers identify the other threads of this team.

idle thread
An OpenMP thread that is not currently part of any parallel region.

thread-safe routine
A routine that performs the intended function even when executed concurrently (by more than one thread).

processor
Implementation-defined hardware unit on which one or more OpenMP threads can execute.

device
An implementation-defined logical execution engine.

COMMENT: A device could have one or more processors.

host device
The device on which the OpenMP program begins execution.

target device
A device onto which code and data may be offloaded from the host device.

parent device
For a given target region, the device on which the corresponding target construct was encountered.