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Fix for PR 17247: Block SIGCHLD while initializing Guile.

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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.
This commit is contained in:
Doug Evans
2014-09-08 22:45:34 -07:00
parent 8374059704
commit 92d8d229d9
5 changed files with 53 additions and 68 deletions
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26
gdb/configure vendored
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@@ -9276,32 +9276,6 @@ else
fi
# PR 17185, see if we can get the libgc version to see if we need
# to apply the workaround.
for ac_header in gc/gc.h
do :
ac_fn_c_check_header_mongrel "$LINENO" "gc/gc.h" "ac_cv_header_gc_gc_h" "$ac_includes_default"
if test "x$ac_cv_header_gc_gc_h" = x""yes; then :
cat >>confdefs.h <<_ACEOF
#define HAVE_GC_GC_H 1
_ACEOF
fi
done
for ac_func in setenv
do :
ac_fn_c_check_func "$LINENO" "setenv" "ac_cv_func_setenv"
if test "x$ac_cv_func_setenv" = x""yes; then :
cat >>confdefs.h <<_ACEOF
#define HAVE_SETENV 1
_ACEOF
fi
done
# --------------------- #
# Check for libmcheck. #
# --------------------- #