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 marked as being thread safe (the developer is responsible for making sure that is the case, for the given DLL or shared library). When a DLL or shared library has been marked as THREAD-SAFE, multiple sessions can access it simultaneously, otherwise access to it is single-threaded, that is, only one session can access it at a time. 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.