1 files changed, 61 insertions, 0 deletions
diff --git a/lib/librthread/synch.h b/lib/librthread/synch.h
new file mode 100644
index 00000000000..2cec188e265
--- /dev/null
+++ b/lib/librthread/synch.h
@@ -0,0 +1,61 @@
+/*	$OpenBSD: synch.h,v 1.4 2018/06/08 13:53:01 pirofti Exp $ */
+/*
+ * Copyright (c) 2017 Martin Pieuchot
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/atomic.h>
+#include <sys/time.h>
+#include <sys/futex.h>
+
+static inline int
+_wake(volatile uint32_t *p, int n)
+{
+	return futex(p, FUTEX_WAKE, n, NULL, NULL);
+}
+
+static inline void
+_wait(volatile uint32_t *p, int val)
+{
+	while (*p != (uint32_t)val)
+		futex(p, FUTEX_WAIT, val, NULL, NULL);
+}
+
+static inline int
+_twait(volatile uint32_t *p, int val, clockid_t clockid, const struct timespec *abs)
+{
+	struct timespec rel;
+
+	if (abs == NULL)
+		return futex(p, FUTEX_WAIT, val, NULL, NULL);
+
+	if (abs->tv_nsec >= 1000000000 || clock_gettime(clockid, &rel))
+		return (EINVAL);
+
+	rel.tv_sec = abs->tv_sec - rel.tv_sec;
+	if ((rel.tv_nsec = abs->tv_nsec - rel.tv_nsec) < 0) {
+		rel.tv_sec--;
+		rel.tv_nsec += 1000000000;
+	}
+	if (rel.tv_sec < 0)
+		return (ETIMEDOUT);
+
+	return futex(p, FUTEX_WAIT, val, &rel, NULL);
+}
+
+static inline int
+_requeue(volatile uint32_t *p, int n, int m, volatile uint32_t *q)
+{
+	return futex(p, FUTEX_REQUEUE, n, (void *)(long)m, q);
+}