1 files changed, 71 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/s390/lowlevelsem.h b/nptl/sysdeps/unix/sysv/linux/s390/lowlevelsem.h
new file mode 100644
index 0000000000..720fef49a9
--- /dev/null
+++ b/nptl/sysdeps/unix/sysv/linux/s390/lowlevelsem.h
@@ -0,0 +1,71 @@
+/* Copyright (C) 2003 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _LOWLEVELSEM_H
+#define _LOWLEVELSEM_H	1
+
+#include <dl-sysdep.h>
+#include <tls.h>
+#include <lowlevellock.h>
+#include <semaphore.h>
+
+
+static inline int
+__attribute__ ((always_inline))
+lll_sem_wait (sem_t *sem)
+{
+  int oldval;
+  int newval;
+
+  while (1)
+    {
+      /* Atomically decrement semaphore counter if it is > 0.  */
+      lll_compare_and_swap ((int *) sem, oldval, newval,
+			    "ltr %2,%1; jnp 1f; ahi %2,-1");
+      /* oldval != newval if the semaphore count has been decremented.	*/
+      if (oldval != newval)
+	return 0;
+      int err = lll_futex_wait ((int *) sem, 0);
+      if (err != 0 && err != -EWOULDBLOCK)
+	return -err;
+    }
+  return 0;
+}
+
+
+#if 0
+/* Not defined anywhere.  */
+extern int __lll_sem_timedwait (sem_t *sem, const struct timespec *ts)
+     attribute_hidden;
+#define lll_sem_timedwait(sem, timeout) \
+  __lll_sem_timedwait (sem, timeout)
+#endif
+
+static inline void
+__attribute__ ((always_inline))
+lll_sem_post(sem_t *sem)
+{
+  int oldval;
+  int newval;
+
+  lll_compare_and_swap ((int *) sem, oldval, newval, "lr %2,%1; ahi %2,1");
+  lll_futex_wake ((int *) sem, newval);
+}
+
+#endif	/* lowlevelsem.h */