[tip:perf/core] tools build feature: Check if pthread_barrier_t is available

[tip-bot for Arnaldo Carvalho de Melo]

Commit-ID:  25ab5abf5b141d7fd13eed506c7458aa04749c29
Gitweb:     https://git.kernel.org/tip/25ab5abf5b141d7fd13eed506c7458aa04749c29
Author:     Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Tue, 5 Dec 2017 10:14:42 -0300
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Tue, 5 Dec 2017 10:21:59 -0300

tools build feature: Check if pthread_barrier_t is available

As 'perf bench futex wake-parallel" will use this, which is not
available in older systems such as versions of the android NDK used in
my container build tests (r12b and r15c at the moment).

Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Cc: James Yang <james.yang@xxxxxxx
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Kim Phillips <kim.phillips@xxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: https://lkml.kernel.org/n/tip-1i7iv54in4wj08lwo55b0pzv@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/build/Makefile.feature               |  1 +
 tools/build/feature/Makefile               |  4 ++++
 tools/build/feature/test-all.c             |  5 +++++
 tools/build/feature/test-pthread-barrier.c | 12 ++++++++++++
 tools/perf/Makefile.config                 |  4 ++++
 5 files changed, 26 insertions(+)

diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
index c71a05b..e52fcef 100644
--- a/tools/build/Makefile.feature
+++ b/tools/build/Makefile.feature
@@ -56,6 +56,7 @@ FEATURE_TESTS_BASIC :=                  \
         libunwind-arm                   \
         libunwind-aarch64               \
         pthread-attr-setaffinity-np     \
+        pthread-barrier     		\
         stackprotector-all              \
         timerfd                         \
         libdw-dwarf-unwind              \
diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index 9698264..cff38f3 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -37,6 +37,7 @@ FILES=                                          \
          test-libunwind-debug-frame-arm.bin     \
          test-libunwind-debug-frame-aarch64.bin \
          test-pthread-attr-setaffinity-np.bin   \
+         test-pthread-barrier.bin		\
          test-stackprotector-all.bin            \
          test-timerfd.bin                       \
          test-libdw-dwarf-unwind.bin            \
@@ -79,6 +80,9 @@ $(OUTPUT)test-hello.bin:
 $(OUTPUT)test-pthread-attr-setaffinity-np.bin:
 	$(BUILD) -D_GNU_SOURCE -lpthread
 
+$(OUTPUT)test-pthread-barrier.bin:
+	$(BUILD) -lpthread
+
 $(OUTPUT)test-stackprotector-all.bin:
 	$(BUILD) -fstack-protector-all
 
diff --git a/tools/build/feature/test-all.c b/tools/build/feature/test-all.c
index 4112702..6fdf832 100644
--- a/tools/build/feature/test-all.c
+++ b/tools/build/feature/test-all.c
@@ -118,6 +118,10 @@
 # include "test-pthread-attr-setaffinity-np.c"
 #undef main
 
+#define main main_test_pthread_barrier
+# include "test-pthread-barrier.c"
+#undef main
+
 #define main main_test_sched_getcpu
 # include "test-sched_getcpu.c"
 #undef main
@@ -187,6 +191,7 @@ int main(int argc, char *argv[])
 	main_test_sync_compare_and_swap(argc, argv);
 	main_test_zlib();
 	main_test_pthread_attr_setaffinity_np();
+	main_test_pthread_barrier();
 	main_test_lzma();
 	main_test_get_cpuid();
 	main_test_bpf();
diff --git a/tools/build/feature/test-pthread-barrier.c b/tools/build/feature/test-pthread-barrier.c
new file mode 100644
index 0000000..0558d93
--- /dev/null
+++ b/tools/build/feature/test-pthread-barrier.c
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <stdint.h>
+#include <pthread.h>
+
+int main(void)
+{
+	pthread_barrier_t barrier;
+
+	pthread_barrier_init(&barrier, NULL, 1);
+	pthread_barrier_wait(&barrier);
+	return pthread_barrier_destroy(&barrier);
+}
diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index f6786fa..2c437ba 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -263,6 +263,10 @@ ifeq ($(feature-pthread-attr-setaffinity-np), 1)
   CFLAGS += -DHAVE_PTHREAD_ATTR_SETAFFINITY_NP
 endif
 
+ifeq ($(feature-pthread-barrier), 1)
+  CFLAGS += -DHAVE_PTHREAD_BARRIER
+endif
+
 ifndef NO_BIONIC
   $(call feature_check,bionic)
   ifeq ($(feature-bionic), 1)