add stub versions of some missing optional pthread interfaces

priority inheritance is not yet supported, and priority protection
probably will not be supported ever unless there's serious demand for
it (it's a fairly heavy-weight feature).

per-thread cpu clocks would be nice to have, but to my knowledge linux
is still not capable of supporting them. glibc fakes them by using the
_process_ cpu-time clock and subtracting the thread creation time,
which gives seriously incorrect semantics (worse than not supporting
the feature at all), so until there's a way to do it right, it will
remain as a stub that always fails.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/thread/pthread_attr_get.c b/src/thread/pthread_attr_get.c
index f81103d8..e4650e42 100644
--- a/src/thread/pthread_attr_get.c
+++ b/src/thread/pthread_attr_get.c
@@ -68,6 +68,11 @@ int pthread_condattr_getpshared(const pthread_condattr_t *restrict a, int *restr
 	return 0;
 }
 
+int pthread_mutexattr_getprotocol(const pthread_mutexattr_t *restrict a, int *restrict protocol)
+{
+	*protocol = PTHREAD_PRIO_NONE;
+	return 0;
+}
 int pthread_mutexattr_getpshared(const pthread_mutexattr_t *restrict a, int *restrict pshared)
 {
 	*pshared = *a>>31;