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ATOMIC_ADD_INT(9) FreeBSD Kernel Developer's Manual ATOMIC_ADD_INT(9) NAME atomic_add_int, atomic_add_int_nv, atomic_add_long, atomic_add_long_nv - atomic addition operations SYNOPSIS #include <sys/atomic.h> void atomic_add_int(volatile unsigned int *p, unsigned int v); unsigned int atomic_add_int_nv(volatile unsigned int *p, unsigned int v); void atomic_add_long(volatile unsigned long *p, unsigned long v); unsigned long atomic_add_long_nv(volatile unsigned long *p, unsigned long v); DESCRIPTION The atomic_add set of functions provide an interface for atomically performing add and add-and-fetch operations with respect to interrupts and multiple processors in the system. The value referenced by the pointer p is incremented by the value v. CONTEXT atomic_add_int(), atomic_add_int_nv(), atomic_add_long(), and atomic_add_long_nv() can all be called during autoconf, from process context, or from interrupt context. RETURN VALUES atomic_add_int and atomic_add_long perform the addition without returning any knowledge of the value at p. atomic_add_int_nv and atomic_add_long_nv return the value at p after the addition was performed. SEE ALSO atomic_inc_int(9), atomic_sub_int(9) HISTORY The atomic_add functions first appeared in NetBSD 5.0 and OpenBSD 5.5. FreeBSD 14.1-RELEASE-p8 February 13, 2014 FreeBSD 14.1-RELEASE-p8