[OE-core] [PATCH] python3: use monotonic clock for condvar if possible

["Zhang, Qiang" <qiang.zhang@windriver.com>]

From: Zqiang <qiang.zhang@windriver.com>

The timeout for threading.Lock, threading.Condition, etc, is not using
a monotonic clock, it is affected if the system time (realtime clock)
is set.

This patch will make condvar use monotonic clock.
Refence: https://bugs.python.org/issue41710

Signed-off-by: Zqiang <qiang.zhang@windriver.com>
---
 meta/recipes-devtools/python/python3_3.9.5.bb | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/meta/recipes-devtools/python/python3_3.9.5.bb b/meta/recipes-devtools/python/python3_3.9.5.bb
index 82177f4a18..f3f0237c78 100644
--- a/meta/recipes-devtools/python/python3_3.9.5.bb
+++ b/meta/recipes-devtools/python/python3_3.9.5.bb
@@ -73,6 +73,9 @@ DEPENDS = "bzip2-replacement-native libffi bzip2 openssl sqlite3 zlib virtual/li
 DEPENDS_append_class-target = " python3-native"
 DEPENDS_append_class-nativesdk = " python3-native"
 
+# force to use the mutex+cond implementation
+CFLAGS += "-DHAVE_BROKEN_POSIX_SEMAPHORES"
+
 EXTRA_OECONF = " --without-ensurepip --enable-shared --with-platlibdir=${baselib}"
 EXTRA_OECONF_append_class-native = " --bindir=${bindir}/${PN}"
 
-- 
2.17.1