We do have process-shared mutexes.
am: 138dfa04ca

Change-Id: I7c91059f1e8edc02ca6f8c0b45af14ad7b231159
diff --git a/Android.bp b/Android.bp
index e37de66..e2daa40 100644
--- a/Android.bp
+++ b/Android.bp
@@ -12,6 +12,7 @@
         "-DCONFIG_LINUX_FALLOCATE",
         "-DCONFIG_LINUX_SPLICE",
         "-DCONFIG_LITTLE_ENDIAN",
+        "-DCONFIG_PSHARED",
         "-DCONFIG_RLIMIT_MEMLOCK",
         "-DCONFIG_RUSAGE_THREAD",
         "-DCONFIG_SCHED_IDLE",