hg: jdk8u/hs-dev/hotspot: 8072147: Preloading libjsig.dylib causes deadlock when signal() is called

[david.buck at oracle.com]

Changeset: 79841fc03469
Author:    dbuck
Date:      2015-07-02 07:30 -0700
URL:       http://hg.openjdk.java.net/jdk8u/hs-dev/hotspot/rev/79841fc03469

8072147: Preloading libjsig.dylib causes deadlock when signal() is called
Summary: Added check to prevent reentry of signal chaining code
Reviewed-by: dcubed, acorn, dholmes

! src/os/bsd/vm/jsig.c