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ABL Reference
Handle Attributes and Methods Reference : THREAD-SAFE attribute

THREAD-SAFE attribute

Indicates whether the DLL or shared library call specified is thread safe.
Data type: LOGICAL
Access: Readable/Writeable
Applies to: Call object handle
If TRUE, the specified DLL or shared library call is thread safe. When a DLL or shared library has been marked as THREAD-SAFE, multiple sessions can access it simultaneously. The value of this attribute is ignored if the LIBRARY attribute is not set or if the application is not running on an instance of the Progress Application Server for OpenEdge.