[Bug gdb/17247] gdb freezes on multi threaded app (test-case attached)

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https://sourceware.org/bugzilla/show_bug.cgi?id=17247

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https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=0df33300929f9b54ddcf040f9b1fe69c1a88304b

commit 0df33300929f9b54ddcf040f9b1fe69c1a88304b
Author: Doug Evans <xdje42@gmail.com>
Date:   Tue Sep 9 21:42:20 2014 -0700

    Fix for PR 17247: Block SIGCHLD while initializing Guile.

    The problem here is that if a thread other than gdb's main thread
    gets a SIGCHLD (it's an asynchronous signal so the kernel will
    essentially pick a random thread) then gdb will hang if it is
    in sigsuspend when the SIGCHLD is delivered.  The other thread
    will see the signal and the sigsuspend won't "wake up".

    Guile and libgc should be blocking SIGCHLD in their threads,
    but we need to work with Guile 2.0 and libgc 7.4.
    The problem first shows up in libgc 7.4 because it is the first
    release that enables multiple marker threads by default.

    gdb/ChangeLog:

            PR 17247
            * guile.c: #include <signal.h>.
            (_initialize_guile): Block SIGCHLD while initializing Guile.

            Replaces the following, which is reverted.

            2014-07-26  Doug Evans  <xdje42@gmail.com>

            PR 17185
            * configure.ac: Add check for header gc/gc.h.
            Add check for function setenv.
            * configure: Regenerate.
            * config.in: Regenerate.
            * guile/guile.c (_initialize_guile): Add workaround for libgc
7.4.0.

-----------------------------------------------------------------------

Summary of changes:
 gdb/ChangeLog     |   17 +++++++++++++
 gdb/config.in     |    6 ----
 gdb/configure     |   26 --------------------
 gdb/configure.ac  |    5 ----
 gdb/guile/guile.c |   67 ++++++++++++++++++++++++++++------------------------
 5 files changed, 53 insertions(+), 68 deletions(-)

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