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ATOMIC_DEC_INT(9) FreeBSD Kernel Developer's Manual ATOMIC_DEC_INT(9) NAME atomic_dec_int, atomic_dec_int_nv, atomic_dec_long, atomic_dec_long_nv - atomic decrement operations SYNOPSIS #include <sys/atomic.h> void atomic_dec_int(volatile unsigned int *p); unsigned int atomic_dec_int_nv(volatile unsigned int *p); void atomic_dec_long(volatile unsigned long *p ); unsigned long atomic_dec_long_nv(volatile unsigned long *p); DESCRIPTION The atomic_dec set of functions provide an interface for atomically performing decrement and decrement-and-fetch operations with respect to interrupts and multiple processors in the system. The value referenced by the pointer p is decremented by 1. CONTEXT atomic_dec_int(), atomic_dec_int_nv(), atomic_dec_long(), and atomic_dec_long_nv() can all be called during autoconf, from process context, or from interrupt context. RETURN VALUES atomic_dec_int and atomic_dec_long perform the decrement without returning any knowledge of the value at p. atomic_dec_int_nv and atomic_dec_long_nv return the value at p after the decrement was performed. SEE ALSO atomic_add_int(9), atomic_inc_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