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-rw-r--r--nptl/tst-mtx-trylock.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/nptl/tst-mtx-trylock.c b/nptl/tst-mtx-trylock.c
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+++ b/nptl/tst-mtx-trylock.c
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+/* C11 threads trylock mutex tests.
+ Copyright (C) 2018 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/>. */
+
+#include <threads.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <support/check.h>
+
+/* Shared mutex between child and parent. */
+static mtx_t mutex;
+
+/* Shared counter to check possible race conditions. */
+static char shrd_counter;
+
+/* Function to choose an action to do, depending on mtx_trylock
+ return value. */
+static inline void
+choose_action (int action, char* thread_name)
+{
+ switch (action)
+ {
+ case thrd_success:
+ ++shrd_counter;
+
+ if (mtx_unlock (&mutex) != thrd_success)
+ FAIL_EXIT1 ("mtx_unlock failed");
+ break;
+
+ case thrd_busy:
+ break;
+
+ case thrd_error:
+ FAIL_EXIT1 ("%s lock error", thread_name);
+ break;
+ }
+}
+
+static int
+child_add (void *arg)
+{
+ char child_name[] = "child";
+
+ /* Try to lock mutex. */
+ choose_action (mtx_trylock (&mutex), child_name);
+
+ thrd_exit (thrd_success);
+}
+
+static int
+do_test (void)
+{
+ thrd_t id;
+ char parent_name[] = "parent";
+
+ if (mtx_init (&mutex, mtx_timed) != thrd_success)
+ FAIL_EXIT1 ("mtx_init failed");
+
+ if (thrd_create (&id, child_add, NULL) != thrd_success)
+ FAIL_EXIT1 ("thrd_create failed");
+
+ choose_action (mtx_trylock (&mutex), parent_name);
+
+ if (thrd_join (id, NULL) != thrd_success)
+ FAIL_EXIT1 ("thrd_join failed");
+
+ if (shrd_counter != 2 && shrd_counter != 1)
+ FAIL_EXIT1 ("shrd_counter != {1,2} (%d)", shrd_counter);
+
+ mtx_destroy (&mutex);
+
+ return 0;
+}
+
+#include <support/test-driver.c>