bionic: pthread: use private futexes by default for mutexes and condvars

Private futexes are a recent kernel addition: faster futexes that cannot be
shared between processes. This patch uses them by default, unless the PROCESS_SHARED
attribute flag is used when creating a mutex and/or conditional variable.

Also introduces pthread_condattr_init/destroy/setpshared/getpshared.

Change-Id: I3a0e2116f467072b046524cb5babc00e41057a53

1 files changed, 5 insertions, 0 deletions

diff --git a/libc/include/pthread.h b/libc/include/pthread.h
index 6603b3f..5c0a349 100644
--- a/libc/include/pthread.h
+++ b/libc/include/pthread.h
@@ -165,6 +165,11 @@ int pthread_mutex_unlock(pthread_mutex_t *mutex);
 int pthread_mutex_trylock(pthread_mutex_t *mutex);
 int pthread_mutex_timedlock(pthread_mutex_t *mutex, struct timespec*  ts);
 
+int pthread_condattr_init(pthread_condattr_t *attr);
+int pthread_condattr_setpshared(pthread_condattr_t *attr, int pshared);
+int pthread_condattr_getpshared(pthread_condattr_t *attr, int *pshared);
+int pthread_condattr_destroy(pthread_condattr_t *attr);
+
 int pthread_cond_init(pthread_cond_t *cond,
                       const pthread_condattr_t *attr);
 int pthread_cond_destroy(pthread_cond_t *cond);