cnd: Add tests.

* tests/test-cnd.c: New file, based on tests/test-cond.c.
* modules/cnd-tests: New file.

ChangeLog

@@ -1,3 +1,9 @@
+2019-06-20  Bruno Haible  <bruno@clisp.org>
+
+	cnd: Add tests.
+	* tests/test-cnd.c: New file, based on tests/test-cond.c.
+	* modules/cnd-tests: New file.
+
 2019-06-20  Bruno Haible  <bruno@clisp.org>
 
 	mtx: Add tests.

modules/cnd-tests

@@ -0,0 +1,16 @@
+Files:
+tests/test-cnd.c
+tests/macros.h
+
+Depends-on:
+mtx
+thrd
+gettimeofday
+
+configure.ac:
+AC_CHECK_DECLS_ONCE([alarm])
+
+Makefile.am:
+TESTS += test-cnd
+check_PROGRAMS += test-cnd
+test_cnd_LDADD = $(LDADD) @LIBSTDTHREAD@

tests/test-cnd.c

@@ -0,0 +1,209 @@
+/* Test of condition variables in multithreaded situations.
+   Copyright (C) 2008-2019 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Which tests to perform.
+   Uncomment some of these, to verify that all tests crash if no locking
+   is enabled.  */
+#define DO_TEST_COND 1
+#define DO_TEST_TIMEDCOND 1
+
+
+/* Whether to help the scheduler through explicit yield().
+   Uncomment this to see if the operating system has a fair scheduler.  */
+#define EXPLICIT_YIELD 1
+
+/* Whether to print debugging messages.  */
+#define ENABLE_DEBUGGING 0
+
+#include <threads.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/time.h>
+
+#if HAVE_DECL_ALARM
+# include <signal.h>
+# include <unistd.h>
+#endif
+
+#include "macros.h"
+
+#if ENABLE_DEBUGGING
+# define dbgprintf printf
+#else
+# define dbgprintf if (0) printf
+#endif
+
+#if EXPLICIT_YIELD
+# define yield() thrd_yield ()
+#else
+# define yield()
+#endif
+
+
+/*
+ * Condition check
+ */
+static int cond_value = 0;
+static cnd_t condtest;
+static mtx_t lockcond;
+
+static int
+cnd_wait_routine (void *arg)
+{
+  ASSERT (mtx_lock (&lockcond) == thrd_success);
+  while (!cond_value)
+    {
+      ASSERT (cnd_wait (&condtest, &lockcond) == thrd_success);
+    }
+  ASSERT (mtx_unlock (&lockcond) == thrd_success);
+
+  cond_value = 2;
+
+  return 0;
+}
+
+void
+test_cnd_wait ()
+{
+  struct timespec remain;
+  thrd_t thread;
+  int ret;
+
+  remain.tv_sec = 2;
+  remain.tv_nsec = 0;
+
+  cond_value = 0;
+
+  ASSERT (thrd_create (&thread, cnd_wait_routine, NULL) == thrd_success);
+  do
+    {
+      yield ();
+      ret = thrd_sleep (&remain, &remain);
+      ASSERT (ret >= -1);
+    }
+  while (ret == -1 && (remain.tv_sec != 0 || remain.tv_nsec != 0));
+
+  /* signal condition */
+  ASSERT (mtx_lock (&lockcond) == thrd_success);
+  cond_value = 1;
+  ASSERT (cnd_signal (&condtest) == thrd_success);
+  ASSERT (mtx_unlock (&lockcond) == thrd_success);
+
+  ASSERT (thrd_join (thread, NULL) == thrd_success);
+
+  if (cond_value != 2)
+    abort ();
+}
+
+
+/*
+ * Timed Condition check
+ */
+static int cond_timeout;
+
+static void
+get_ts (struct timespec *ts)
+{
+  struct timeval now;
+
+  gettimeofday (&now, NULL);
+
+  ts->tv_sec = now.tv_sec + 1;
+  ts->tv_nsec = now.tv_usec * 1000;
+}
+
+static int
+cnd_timedwait_routine (void *arg)
+{
+  int ret;
+  struct timespec ts;
+
+  ASSERT (mtx_lock (&lockcond) == thrd_success);
+  while (!cond_value)
+    {
+      get_ts (&ts);
+      ret = cnd_timedwait (&condtest, &lockcond, &ts);
+      if (ret == thrd_timedout)
+        cond_timeout = 1;
+    }
+  ASSERT (mtx_unlock (&lockcond) == thrd_success);
+
+  return 0;
+}
+
+static void
+test_cnd_timedwait (void)
+{
+  struct timespec remain;
+  thrd_t thread;
+  int ret;
+
+  remain.tv_sec = 2;
+  remain.tv_nsec = 0;
+
+  cond_value = cond_timeout = 0;
+
+  ASSERT (thrd_create (&thread, cnd_timedwait_routine, NULL) == thrd_success);
+  do
+    {
+      yield ();
+      ret = thrd_sleep (&remain, &remain);
+      ASSERT (ret >= -1);
+    }
+  while (ret == -1 && (remain.tv_sec != 0 || remain.tv_nsec != 0));
+
+  /* signal condition */
+  ASSERT (mtx_lock (&lockcond) == thrd_success);
+  cond_value = 1;
+  ASSERT (cnd_signal (&condtest) == thrd_success);
+  ASSERT (mtx_unlock (&lockcond) == thrd_success);
+
+  ASSERT (thrd_join (thread, NULL) == thrd_success);
+
+  if (!cond_timeout)
+    abort ();
+}
+
+int
+main ()
+{
+#if HAVE_DECL_ALARM
+  /* Declare failure if test takes too long, by using default abort
+     caused by SIGALRM.  */
+  int alarm_value = 600;
+  signal (SIGALRM, SIG_DFL);
+  alarm (alarm_value);
+#endif
+
+  ASSERT (cnd_init (&condtest) == thrd_success);
+  ASSERT (mtx_init (&lockcond, mtx_plain) == thrd_success);
+
+#if DO_TEST_COND
+  printf ("Starting test_cnd_wait ..."); fflush (stdout);
+  test_cnd_wait ();
+  printf (" OK\n"); fflush (stdout);
+#endif
+#if DO_TEST_TIMEDCOND
+  printf ("Starting test_cnd_timedwait ..."); fflush (stdout);
+  test_cnd_timedwait ();
+  printf (" OK\n"); fflush (stdout);
+#endif
+
+  return 0;
+}