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.Dd April 11, 2013
.Dt ck_pr_btc 3
.Sh NAME
.Nm ck_pr_btc_ptr ,
.Nm ck_pr_btc_uint ,
.Nm ck_pr_btc_int ,
.Nm ck_pr_btc_64 ,
.Nm ck_pr_btc_32 ,
.Nm ck_pr_btc_16
.Nd atomic bit test-and-complement operations
.Sh LIBRARY
Concurrency Kit (libck, \-lck)
.Sh SYNOPSIS
.In ck_pr.h
.Ft bool
.Fn ck_pr_btc_ptr "void *target" "unsigned int bit_index"
.Ft bool
.Fn ck_pr_btc_uint "uint *target" "unsigned int bit_index"
.Ft bool
.Fn ck_pr_btc_int "int *target" "unsigned int bit_index"
.Ft bool
.Fn ck_pr_btc_64 "uint64_t *target" "unsigned int bit_index"
.Ft bool
.Fn ck_pr_btc_32 "uint32_t *target" "unsigned int bit_index"
.Ft bool
.Fn ck_pr_btc_16 "uint16_t *target" "unsigned int bit_index"
.Sh DESCRIPTION
The 
.Fn ck_pr_btc 3
family of functions atomically fetch the value
of the bit in
.Fa target
at index
.Fa bit_index 
and set that bit to its complement.
.Sh RETURN VALUES
These family of functions return the original value of
the bit at offset
.Fa bit_index
that is in the value pointed to by
.Fa target .
.Sh SEE ALSO
.Xr ck_pr_fence_load 3 ,
.Xr ck_pr_fence_load_depends 3 ,
.Xr ck_pr_fence_store 3 ,
.Xr ck_pr_fence_memory 3 ,
.Xr ck_pr_load 3 ,
.Xr ck_pr_store 3 ,
.Xr ck_pr_fas 3 ,
.Xr ck_pr_faa 3 ,
.Xr ck_pr_inc 3 ,
.Xr ck_pr_dec 3 ,
.Xr ck_pr_neg 3 , 
.Xr ck_pr_not 3 ,
.Xr ck_pr_sub 3 ,
.Xr ck_pr_and 3 ,
.Xr ck_pr_or 3 ,
.Xr ck_pr_xor 3 ,
.Xr ck_pr_add 3 ,
.Xr ck_pr_btc 3 ,
.Xr ck_pr_btr 3 ,
.Xr ck_pr_cas 3
.Pp
Additional information available at http://concurrencykit.org/
