The spinn_common library provides miscellaneous support functions to SpiNNaker applications. These are mainly:

assert.h — a general assertion framework
bit_field.h — a bit-field system (used particularly for recording spike events in sPyNNaker)
circular_buffer.h — a high-speed lock-free circular buffer implementation
pair.h — a type of a pair of words
arm.h — access to low-level ARM instructions
random.h — various validated random number generators

In addition, the following libraries are provided for access to mathematical operations and types:

stdfix-full-iso.h — extends the standard stdfix.h header to support more of the optional parts of the ISO specification for fixed point arithmetic in C
log.h — fixed point logarithm
normal.h — fixed point normally distributed random numbers
round.h — fixed point multiplication with rounding control (especially stochastic rounding)
sincos.h — basic fixed point trigonometric functions
sqrt.h — fixed point square root
stdfix-exp.h — fixed point exponential
utils.h — miscellaneous fixed point functions