08-18-2016
There are solutions around in here, e.g. using a "ring buffer", that do this more understandably (and mayhap elegantly).
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LEARN ABOUT DEBIAN
vrb_is_not_empty
vrb_is_not_empty(3) VRB Programmer's Manual vrb_is_not_empty(3)
NAME
vrb_is_not_empty - indicate if VRB is not_empty
LIBRARY
-lvrb
SYNOPSIS
#include <vrb.h>
int vrb_is_not_empty(vrb_p vrb);
DESCRIPTION
vrb_is_not_empty returns false or true to indicate if the specified virtual ring buffer is empty or not.
ARGUMENTS
vrb_p vrb
specifies the virtual ring buffer to examine
RETURN VALUE
int
If the virtual ring buffer is not empty, 1 is returned, otherwise 0 is returned.
SEE ALSO
vrb(3), vrb_capacity(3), vrb_data_len(3), vrb_data_ptr(3), vrb_destroy(3), vrb_get(3), vrb_get_min(3), vrb_give(3), vrb_init(3),
vrb_init_opt(3), vrb_is_empty(3), vrb_is_full(3), vrb_is_not_full(3), vrb_move(3), vrb_new(3), vrb_new_opt(3), vrb_put(3), vrb_put_all(3),
vrb_read(3), vrb_read_min(3), vrb_resize(3), vrb_space_len(3), vrb_space_ptr(3), vrb_take(3), vrb_uninit(3), vrb_write(3), vrb_write_min(3)
vrb 2002-09-30 vrb_is_not_empty(3)