1 files changed, 63 insertions, 0 deletions
diff --git a/nptl/sysdeps/pthread/pthread_cond_signal.c b/nptl/sysdeps/pthread/pthread_cond_signal.c
new file mode 100644
index 0000000000..1a035fe05f
--- /dev/null
+++ b/nptl/sysdeps/pthread/pthread_cond_signal.c
@@ -0,0 +1,63 @@
+/* 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.  */
+
+#include <endian.h>
+#include <errno.h>
+#include <sysdep.h>
+#include <lowlevellock.h>
+#include <pthread.h>
+#include <pthreadP.h>
+
+#include <shlib-compat.h>
+
+int
+__pthread_cond_signal (cond)
+     pthread_cond_t *cond;
+{
+  /* Make sure we are alone.  */
+  lll_mutex_lock(cond->__data.__lock);
+
+  /* Are there any waiters to be woken?  */
+  if (cond->__data.__total_seq > cond->__data.__wakeup_seq)
+    {
+      /* Yes.  Mark one of them as woken.  */
+      ++cond->__data.__wakeup_seq;
+
+      /* The futex syscall operates on a 32-bit word.  That is fine,
+	 we just use the low 32 bits of the sequence counter.  */
+#if BYTE_ORDER == LITTLE_ENDIAN
+      int *futex = ((int *) (&cond->__data.__wakeup_seq));
+#elif BYTE_ORDER == BIG_ENDIAN
+      int *futex = ((int *) (&cond->__data.__wakeup_seq)) + 1;
+#else
+# error "No valid byte order"
+#endif
+
+      /* Wake one.  */
+      lll_futex_wake (futex, 1);
+    }
+
+  /* We are done.  */
+  lll_mutex_unlock (cond->__data.__lock);
+
+  return 0;
+}
+
+versioned_symbol (libpthread, __pthread_cond_signal, pthread_cond_signal,
+		  GLIBC_2_3_2);