Add libkqueue as a git submodule to pick up fixes

Author: seabaylea

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "libpwq"]
 	path = libpwq
 	url = https://github.com/mheily/libpwq.git
+[submodule "libkqueue"]
+	path = libkqueue
+	url = https://github.com/mheily/libkqueue.git

Makefile.am

@@ -5,24 +5,23 @@
 ACLOCAL_AMFLAGS = -I m4
 
 if BUILD_OWN_PTHREAD_WORKQUEUES
-SUBDIRS=					\
-	dispatch				\
-	libpwq					\
-	man						\
-	os						\
-	private					\
-	src						\
-	tests
-else
-SUBDIRS=					\
-	dispatch				\
-	man						\
-	os						\
-	private					\
-	src						\
-	tests
+  MAYBE_PTHREAD_WORKQUEUES = libpwq
+endif
+
+if BUILD_OWN_KQUEUES
+  MAYBE_KQUEUES = libkqueue
 endif
 
+SUBDIRS=						\
+	dispatch					\
+	$(MAYBE_PTHREAD_WORKQUEUES)	\
+	$(MAYBE_KQUEUES)			\
+	man							\
+	os							\
+	private						\
+	src							\
+	tests
+
 EXTRA_DIST=					\
 	README.md				\
 	LICENSE					\

configure.ac

@@ -183,12 +183,18 @@ esac
 AC_SEARCH_LIBS(clock_gettime, rt)
 AC_SEARCH_LIBS(pthread_create, pthread)
 
-#
-# Prefer native kqueue(2); otherwise use libkqueue if present.
-#
-AC_CHECK_HEADER(sys/event.h, [],
-  [PKG_CHECK_MODULES(KQUEUE, libkqueue)]
+AS_IF([test -f $srcdir/libkqueue/configure.ac],
+  [AC_DEFINE(BUILD_OWN_KQUEUES, 1, [Define if building libkqueue from source])
+   ac_configure_args="--disable-libkqueue-install $ac_configure_args"
+   AC_CONFIG_SUBDIRS([libkqueue])
+   build_own_kqueues=true],
+  [build_own_kqueues=false
+   AC_CHECK_HEADER(sys/event.h, [],
+     [PKG_CHECK_MODULES(KQUEUE, libkqueue)]
+   )
+  ]
 )
+AM_CONDITIONAL(BUILD_OWN_KQUEUES, $build_own_kqueues)
 
 AC_CHECK_FUNCS([strlcpy getprogname], [],
   [PKG_CHECK_MODULES(BSD_OVERLAY, libbsd-overlay,[

libkqueue

@@ -60,12 +60,17 @@ EXTRA_libdispatch_la_DEPENDENCIES=
 AM_CPPFLAGS=-I$(top_builddir) -I$(top_srcdir) -I$(top_srcdir)/private
 
 DISPATCH_CFLAGS=-Wall $(VISIBILITY_FLAGS) $(OMIT_LEAF_FP_FLAGS) \
-	$(MARCH_FLAGS) $(KQUEUE_CFLAGS) $(BSD_OVERLAY_CFLAGS)
-AM_CFLAGS= $(PTHREAD_WORKQUEUE_CFLAGS) $(DISPATCH_CFLAGS) $(CBLOCKS_FLAGS)
+	$(MARCH_FLAGS) $(BSD_OVERLAY_CFLAGS)
+AM_CFLAGS= $(KQUEUE_CFLAGS) $(PTHREAD_WORKQUEUE_CFLAGS) $(DISPATCH_CFLAGS) $(CBLOCKS_FLAGS)
 AM_OBJCFLAGS=$(DISPATCH_CFLAGS) $(CBLOCKS_FLAGS)
-AM_CXXFLAGS=$(PTHREAD_WORKQUEUE_CFLAGS) $(DISPATCH_CFLAGS) $(CXXBLOCKS_FLAGS)
+AM_CXXFLAGS=$(KQUEUE_CFLAGS) $(PTHREAD_WORKQUEUE_CFLAGS) $(DISPATCH_CFLAGS) $(CXXBLOCKS_FLAGS)
 AM_OBJCXXFLAGS=$(DISPATCH_CFLAGS) $(CXXBLOCKS_FLAGS)
 
+if BUILD_OWN_KQUEUES
+  KQUEUE_LIBS+=$(top_builddir)/libkqueue/libkqueue.la
+  KQUEUE_CFLAGS+=-I$(top_srcdir)/libkqueue/include
+endif
+
 if BUILD_OWN_PTHREAD_WORKQUEUES
   PTHREAD_WORKQUEUE_LIBS=$(top_builddir)/libpwq/libpthread_workqueue.la
   PTHREAD_WORKQUEUE_CFLAGS=-I$(top_srcdir)/libpwq/include

src/Makefile.am

@@ -115,6 +115,11 @@ AM_OBJCFLAGS=$(DISPATCH_TESTS_CFLAGS) $(CBLOCKS_FLAGS)
 AM_CXXFLAGS=$(DISPATCH_TESTS_CFLAGS) $(CXXBLOCKS_FLAGS) $(BSD_OVERLAY_CFLAGS)
 AM_OBJCXXFLAGS=$(DISPATCH_TESTS_CFLAGS) $(CXXBLOCKS_FLAGS)
 
+if BUILD_OWN_KQUEUES
+  KQUEUE_LIBS+=$(top_builddir)/libkqueue/libkqueue.la
+  KQUEUE_CFLAGS+=-I$(top_srcdir)/libkqueue/include
+endif
+
 if !BUILD_OWN_PTHREAD_WORKQUEUES
 if HAVE_PTHREAD_WORKQUEUES
   PTHREAD_WORKQUEUE_LIBS=-lpthread_workqueue