libstdthreads: Import from FreeBSD

1 files changed, 116 insertions, 0 deletions

diff --git a/cpukit/libstdthreads/mtx.c b/cpukit/libstdthreads/mtx.c
new file mode 100644
index 0000000000..2d42f8a8db
--- /dev/null
+++ b/cpukit/libstdthreads/mtx.c
@@ -0,0 +1,116 @@
+/*-
+ * Copyright (c) 2011 Ed Schouten <ed@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD r279326 2015-02-26T16:39:57Z$
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <errno.h>
+#include <pthread.h>
+
+#include "threads.h"
+
+void
+mtx_destroy(mtx_t *mtx)
+{
+
+	(void)pthread_mutex_destroy(mtx);
+}
+
+int
+mtx_init(mtx_t *mtx, int type)
+{
+	pthread_mutexattr_t attr;
+	int mt;
+
+	switch (type) {
+	case mtx_plain:
+	case mtx_timed:
+		mt = PTHREAD_MUTEX_NORMAL;
+		break;
+	case mtx_plain | mtx_recursive:
+	case mtx_timed | mtx_recursive:
+		mt = PTHREAD_MUTEX_RECURSIVE;
+		break;
+	default:
+		return (thrd_error);
+	}
+
+	if (pthread_mutexattr_init(&attr) != 0)
+		return (thrd_error);
+	if (pthread_mutexattr_settype(&attr, mt) != 0)
+		return (thrd_error);
+	if (pthread_mutex_init(mtx, &attr) != 0)
+		return (thrd_error);
+	return (thrd_success);
+}
+
+int
+mtx_lock(mtx_t *mtx)
+{
+
+	if (pthread_mutex_lock(mtx) != 0)
+		return (thrd_error);
+	return (thrd_success);
+}
+
+int
+mtx_timedlock(mtx_t *restrict mtx, const struct timespec *restrict ts)
+{
+
+	switch (pthread_mutex_timedlock(mtx, ts)) {
+	case 0:
+		return (thrd_success);
+	case ETIMEDOUT:
+		return (thrd_timedout);
+	default:
+		return (thrd_error);
+	}
+}
+
+int
+mtx_trylock(mtx_t *mtx)
+{
+
+	switch (pthread_mutex_trylock(mtx)) {
+	case 0:
+		return (thrd_success);
+	case EBUSY:
+		return (thrd_busy);
+	default:
+		return (thrd_error);
+	}
+}
+
+int
+mtx_unlock(mtx_t *mtx)
+{
+
+	if (pthread_mutex_unlock(mtx) != 0)
+		return (thrd_error);
+	return (thrd_success);
+}