pbuf::ref - syntax, references, description

the reference count always equals the number of pointers that refer to this pbuf. This can be pointers from an application, the stack itself, or pbuf->next pointers from a chain.

References

Location	Referrer	Text
pbuf.h:218		LWIP_PBUF_REF_T ref;
ip4.c:852	ip4_output_if_src()	LWIP_IP_CHECK_PBUF_REF_COUNT_FOR_TX(p);
ip4.c:1033	ip4_output()	LWIP_IP_CHECK_PBUF_REF_COUNT_FOR_TX(p);
pbuf.c:187	pbuf_init_alloced_pbuf()	p->ref = 1;
pbuf.c:753	pbuf_free()	LWIP_ASSERT("pbuf_free: p->ref > 0", p->ref > 0);
pbuf.c:755	pbuf_free()	ref = --(p->ref);
pbuf.c:833	pbuf_ref()	SYS_ARCH_SET(p->ref, (LWIP_PBUF_REF_T)(p->ref + 1));
pbuf.c:834	pbuf_ref()	LWIP_ASSERT("pbuf ref overflow", p->ref > 0);
tcp_out.c:1439	tcp_output_segment_busy()	if (seg->p->ref != 1) {