1 files changed, 69 insertions, 0 deletions
diff --git a/src/xshmfenceint.h b/src/xshmfenceint.h
new file mode 100644
index 0000000..3f5c561
--- /dev/null
+++ b/src/xshmfenceint.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright © 2013 Keith Packard
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  The copyright holders make no representations
+ * about the suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, 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.
+ */
+
+#ifndef _XSHMFENCEINT_H_
+#define _XSHMFENCEINT_H_
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <linux/futex.h>
+#include <sys/time.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <sys/mman.h>
+#include <errno.h>
+#include <values.h>
+
+static inline long sys_futex(void *addr1, int op, int val1, struct timespec *timeout, void *addr2, int val3)
+{
+	return syscall(SYS_futex, addr1, op, val1, timeout, addr2, val3);
+}
+
+static inline int futex_wake(int32_t *addr) {
+	return sys_futex(addr, FUTEX_WAKE, MAXINT, NULL, NULL, 0);
+}
+
+static inline int futex_wait(int32_t *addr, int32_t value) {
+	return sys_futex(addr, FUTEX_WAIT, value, NULL, NULL, 0);
+}
+
+#define barrier() __asm__ __volatile__("": : :"memory")
+
+static inline void atomic_store(int32_t *f, int32_t v)
+{
+	barrier();
+	*f = v;
+	barrier();
+}
+
+static inline int32_t atomic_fetch(int32_t *a)
+{
+	int32_t v;
+	barrier();
+	v = *a;
+	barrier();
+	return v;
+}
+	
+#endif /* _XSHMFENCEINT_H_ */