pthread: Move semaphore initialization for open to semaphoreP.h

This allows to easily reuse all of the sem_open/sem_close/sem_unlink
implementations in the various ports.

1 files changed, 15 insertions, 0 deletions

diff --git a/nptl/semaphoreP.h b/nptl/semaphoreP.h
index f25ba329d7..2f8757e1f0 100644
--- a/nptl/semaphoreP.h
+++ b/nptl/semaphoreP.h
@@ -17,6 +17,7 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <semaphore.h>
+#include <futex-internal.h>
 #include "pthreadP.h"
 
 #define SEM_SHM_PREFIX  "sem."
@@ -42,6 +43,20 @@ extern int __sem_mappings_lock attribute_hidden;
 /* Comparison function for search in tree with existing mappings.  */
 extern int __sem_search (const void *a, const void *b) attribute_hidden;
 
+static inline void __new_sem_open_init (struct new_sem *sem, unsigned value)
+{
+#if __HAVE_64B_ATOMICS
+  sem->data = value;
+#else
+  sem->value = value << SEM_VALUE_SHIFT;
+  sem->nwaiters = 0;
+#endif
+  /* pad is used as a mutex on pre-v9 sparc and ignored otherwise.  */
+  sem->pad = 0;
+
+  /* This always is a shared semaphore.  */
+  sem->private = FUTEX_SHARED;
+}
 
 /* Prototypes of functions with multiple interfaces.  */
 extern int __new_sem_init (sem_t *sem, int pshared, unsigned int value);