Optimization processing for BPX1PST, BPX4PST (pthread_setintrtype)

Information in the THLI area can be used to optimize pthread_setintrtype (BPX1PST, BPX4PST) callable service invocations.

Table 1 maps the actions that can be taken for BPX1PST (BPX4PST) when there is no signal pending. The result column shows the action that the optimizing program can take. The cancel pending column reflects the setting of ThliCancelPending, the cancel disabled column the setting of ThliCancelPending, and the current interruptability type column the setting of ThliCancelAsync. The new interruptability type is provided by the caller of BPX1PST (BPX4PST).

Table 1. Optimization processing for BPX1PST, BPX4PST (pthread_setintrtype)
The current int. type	New int. type	Cancel disabled	Cancel pending	Result
Controlled	Controlled	N/A	N/A	Return "controlled"
Asynch	Controlled	N/A	N/A	Issue BPX1PST
Controlled	Asynch	N/A	N/A	Issue BPX1PST (BPX4PST)
Asynch	Asynch	Yes	N/A	Return "asynch"
Asynch	Asynch	No	No	Return "asynch"
Asynch	Asynch	No	Yes	Issue BPX1PST (BPX4PST)
N/A	Invalid	N/A	N/A	Issue BPX1PST (BPX4PST)

In other words, the optimizing program should issue the BPX1PST (BPX4PST) if there is a request to change the interruptability type; or if the type is asynchronous and cancel is not disabled (ThliCancelDisabled off) and there is a cancel pending (ThliCancelPending on).