/*
- * Copyright 2016 Facebook, Inc.
+ * Copyright 2016-present Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#include <mutex>
#include <folly/Portability.h>
+#include <folly/portability/SysSyscall.h>
#include <folly/portability/Unistd.h>
-#if !defined(__NR_membarrier) && FOLLY_X64 && !FOLLY_MOBILE && \
- defined(__linux__)
+#if FOLLY_X64 && !FOLLY_MOBILE && defined(__linux__)
+#define FOLLY_USE_SYS_MEMBARRIER 1
+#if !defined(__NR_membarrier)
#define __NR_membarrier 324
+#endif
+#if FOLLY_HAVE_LINUX_MEMBARRIER_H
+#include <linux/membarrier.h> // @manual
+#else
#define MEMBARRIER_CMD_QUERY 0
#define MEMBARRIER_CMD_SHARED 1
#endif
+#endif
namespace folly {
namespace detail {
return false;
}
-#ifdef __NR_membarrier
+#if FOLLY_USE_SYS_MEMBARRIER
auto r = syscall(__NR_membarrier, MEMBARRIER_CMD_QUERY, /* flags = */ 0);
if (r == -1) {
return false;
}
int sysMembarrier() {
-#ifdef __NR_membarrier
+#if FOLLY_USE_SYS_MEMBARRIER
return syscall(__NR_membarrier, MEMBARRIER_CMD_SHARED, /* flags = */ 0);
#else
return -1;
#endif
}
-}
-}
+} // namespace detail
+} // namespace folly