ACC Release Notes for the B.03.01 Release

Advanced Communications Controller Release Notes for the B.03.01 Release

Major Enhancements and New Features

Changes for ACC Development

• This release of ACC software supports true multi-threading.

All APIs are enhanced to be Thread-Safe using POSIX

(1003.1c) kernel threads. The ACC kernel drivers are also

optimized for multiprocessor hardware. Hence, maximum

concurrency and true physical parallelism can be achieved

with multiprocessor hardware.

• During compilation and linking, the POSIX thread library is

required to link an ACC application. The thread option is also

required if the application is multi-threaded. For example, the

following options are to be used in cc:

-D_POSIX_C_SOURCE=199506L -lzcom_c -lpthread

• Fields ltmxtm and ltsubch are removed from the Logical

Terminal Table (zltt_type). The same information can be

retrieved from the Physical Terminal Table (zptt_type), ﬁelds

ptmx_term and subch.

• To support 64-bit operations, the API zltstore( ) is modiﬁed to

silently round up the storage size to be allocated to a multiple

of 8-bytes. For consistency, this behavior is the same in both

32/64-bit ACC.

• Three new ZX25 API calls have been added in conjunction with

the D-bit enhancements to the X.25 protocol. The calls are:

zx25dbit_ack() used to acknowledge the receipt of an X.25

message fragment with the D-bit set to 1. zx25int_conf() used

to acknowledge the receipt of an interrupt packet on an X.25

virtual circuit. zx25send_int() is provided as the preferred

method for sending interrupt data on an X.25 virtual circuit.

For backwards compatibility, the use of zcntl() is still

supported, but if using this older call, the interrupt data may

not be sent when a virtual circuit is transmit ﬂow control

blocked.

• When a T1 port is dynamically conﬁgured using zconﬁg()

timeslots 25 to 31 inclusive and timeslot zero can only be

assigned to subchannel zero, otherwise a status code

(PT_BAD_TS) will be returned. When an E1 port is