doc/ck_bitmap: Add ck_bitmap_init manual page.

doc/ck_bitmap_init

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+.\"
+.\" Copyright 2012 Samy Al Bahra.
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+.Dd April 22, 2012
+.Dt CK_BITMAP_INIT 3
+.Sh NAME
+.Nm ck_bitmap_init
+.Nd initialize a bitmap
+.Sh LIBRARY
+Concurrency Kit (libck, \-lck)
+.Sh SYNOPSIS
+.In ck_bitmap.h
+.Ft void 
+.Fn ck_bitmap_init "ck_bitmap_t *bitmap" "unsigned int n_bits" "bool set"
+.Sh DESCRIPTION
+The 
+.Fn ck_bitmap_init
+function initializes the bitmap pointed to by the
+.Fa bitmap
+pointer. The argument
+.Fa n_bits
+specifies the number of bits that are to be stored in the bitmap.
+The argument
+.Fa set
+determines whether the values of the bits in
+.Fa bitmap
+are to be initialized to
+.Dv 1
+or
+.Dv 0 .
+.Pp
+It is expected that
+.Fa bitmap
+points to a contiguous region of memory containing at least
+the number of bytes specified by
+.Xr ck_bitmap_size 3 .
+.Sh RETURN VALUES
+This function has no return value.
+.Sh ERRORS
+.Bl -tag -width Er
+.Pp
+The behavior of
+.Fn ck_bitmap_init
+is undefined if
+.Fa bitmap
+is not a pointer to a region of bytes
+of at least
+.Xr ck_bitmap_size 3
+length.
+.El
+.Sh SEE ALSO
+.Xr ck_bitmap_base 3 ,
+.Xr ck_bitmap_size 3 ,
+.Xr ck_bitmap_set_mpmc 3 ,
+.Xr ck_bitmap_reset_mpmc 3 ,
+.Xr ck_bitmap_clear 3 ,
+.Xr ck_bitmap_test 3 ,
+.Xr ck_bitmap_bits 3 ,
+.Xr ck_bitmap_buffer 3
+.Pp
+Additional information available at http://concurrencykit.org/