support: Introduce new subdirectory for test infrastructure

The new test driver in <support/test-driver.c> has feature parity with
the old one.  The main difference is that its hooking mechanism is
based on functions and function pointers instead of macros.  This
commit also implements a new environment variable, TEST_COREDUMPS,
which disables the code which disables coredumps (that is, it enables
them if the invocation environment has not disabled them).

<test-skeleton.c> defines wrapper functions so that it is possible to
use existing macros with the new-style hook functionality.

This commit changes only a few test cases to the new test driver, to
make sure that it works as expected.

1 files changed, 61 insertions, 0 deletions

diff --git a/support/xthread.h b/support/xthread.h
new file mode 100644
index 0000000000..f0dc0fa613
--- /dev/null
+++ b/support/xthread.h
@@ -0,0 +1,61 @@
+/* Support functionality for using threads.
+   Copyright (C) 2016 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
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef SUPPORT_THREAD_H
+#define SUPPORT_THREAD_H
+
+#include <pthread.h>
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+/* Terminate the process (with exit status 0) after SECONDS have
+   elapsed, from a helper thread.  The process is terminated with the
+   exit function, so atexit handlers are executed.  */
+void delayed_exit (int seconds);
+
+/* Terminate the process (with exit status 1) if VALUE is not zero.
+   In that case, print a failure message to standard output mentioning
+   FUNCTION.  The process is terminated with the exit function, so
+   atexit handlers are executed.  */
+void xpthread_check_return (const char *function, int value);
+
+/* The following functions call the corresponding libpthread functions
+   and terminate the process on error.  */
+
+void xpthread_barrier_init (pthread_barrier_t *barrier,
+                            pthread_barrierattr_t *attr, unsigned int count);
+void xpthread_barrier_destroy (pthread_barrier_t *barrier);
+void xpthread_mutex_lock (pthread_mutex_t *mutex);
+void xpthread_mutex_unlock (pthread_mutex_t *mutex);
+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);
+pthread_t xpthread_create (pthread_attr_t *attr,
+                           void *(*thread_func) (void *), void *closure);
+void xpthread_detach (pthread_t thr);
+void xpthread_cancel (pthread_t thr);
+void *xpthread_join (pthread_t thr);
+
+/* This function returns non-zero if pthread_barrier_wait returned
+   PTHREAD_BARRIER_SERIAL_THREAD.  */
+int xpthread_barrier_wait (pthread_barrier_t *barrier);
+
+__END_DECLS
+
+#endif /* SUPPORT_THREAD_H */