RTI Connext DDS Micro C API  Version 3.0.2
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The DDS_DataReaderResourceLimitsQosPolicy::max_outstanding_reads resource-limit limits the maximum number of simultaneous loans an application can make at any given time using the FooDataReader_read() and FooDataReader_take() APIs.
Typically a value of 1 is sufficient. It is only necessary to increase this value if an application thread will access the same cache before another thread has returned the loan.

RTI Connext DDS Micro C API Version 3.0.2 Copyright © Thu Dec 12 2019 Real-Time Innovations, Inc