Alan Cox 7abe2ac214 Add send buffer locking to uipc_send(). Without this locking a race can
occur between a reader and a writer that results in a panic upon close,
e.g.,
	"panic: sbflush_locked: cc 4 || mb 0xffffff0052afa400 || mbcnt 0"

Reviewed by: rwatson@
MFC after: 2 weeks
2004-12-22 20:28:46 +00:00
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