Import libpthread.

1 files changed, 54 insertions, 0 deletions

diff --git a/sysdeps/generic/pt-cond-signal.c b/sysdeps/generic/pt-cond-signal.c
new file mode 100644
index 0000000..c5e1bc1
--- /dev/null
+++ b/sysdeps/generic/pt-cond-signal.c
@@ -0,0 +1,54 @@
+/* Signal a condition.  Generic version.
+   Copyright (C) 2000 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <pthread.h>
+
+#include <pt-internal.h>
+
+static int
+cond_signal (struct __pthread_cond *cond, int *unblocked)
+{
+  struct __pthread *wakeup;
+  
+  __pthread_spin_lock (&cond->__lock);
+  wakeup = cond->__queue;
+  if (wakeup)
+    __pthread_dequeue (wakeup);
+  __pthread_spin_unlock (&cond->__lock);
+
+  if (wakeup)
+    {
+      /* We found a thread waiting for the condition to be signalled.
+         Wake it up!  */
+      __pthread_wakeup (wakeup);
+      *unblocked = 1;
+    }
+
+  return 0;
+}
+
+/* Unblock at least one of the threads that are blocked on condition
+   variable COND.  */
+int
+pthread_cond_signal (pthread_cond_t *cond)
+{
+  int unblocked = 0;
+
+  return cond_signal (cond, &unblocked);
+}