hg: dio/dev: 8058510: race condition in UART write

[jen.dority at oracle.com]

Changeset: 4062e137c8f2
Author:    jld
Date:      2014-09-17 16:01 -0400
URL:       http://hg.openjdk.java.net/dio/dev/rev/4062e137c8f2

8058510: race condition in UART write
Summary: store signal instead of drop it if no threads are waiting on it yet
Reviewed-by: alkonsta

! .hgignore
! src/se/native/com/oracle/dio/dio_common.cpp