support: Add xpthread_cond_signal wrapper

Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

support/Makefile

@@ -159,6 +159,7 @@ libsupport-routines = \
   xpthread_cancel \
   xpthread_check_return \
   xpthread_cond_wait \
+  xpthread_cond_signal \
   xpthread_create \
   xpthread_detach \
   xpthread_join \

support/xpthread_cond_signal.c

@@ -0,0 +1,26 @@
+/* pthread_cond_signal with error checking.
+   Copyright (C) 2022 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 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, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <support/xthread.h>
+
+void
+xpthread_cond_signal (pthread_cond_t *cond)
+{
+  xpthread_check_return
+    ("pthread_cond_signal", pthread_cond_signal (cond));
+}

support/xthread.h

@@ -62,6 +62,7 @@ void xpthread_mutex_consistent (pthread_mutex_t *);
 void xpthread_spin_lock (pthread_spinlock_t *lock);
 void xpthread_spin_unlock (pthread_spinlock_t *lock);
 void xpthread_cond_wait (pthread_cond_t * cond, pthread_mutex_t * mutex);
+void xpthread_cond_signal (pthread_cond_t *cond);
 pthread_t xpthread_create (pthread_attr_t *attr,
                            void *(*thread_func) (void *), void *closure);
 void xpthread_detach (pthread_t thr);