RequestContext support

[folly.git] / folly / Portability.h

diff --git a/folly/Portability.h b/folly/Portability.h
index 6ce3d51dfb67c7def26d835e1e928267003d6d8c..fbd8e3aba8786fab5297c0073e5fa5b459c1df0e 100644 (file)
--- a/folly/Portability.h
+++ b/folly/Portability.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2014 Facebook, Inc.
+ * Copyright 2015 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,7 +18,7 @@
 #define FOLLY_PORTABILITY_H_
 
 #ifndef FOLLY_NO_CONFIG
-#include "folly-config.h"
+#include <folly/folly-config.h>
 #endif
 
 #ifdef FOLLY_PLATFORM_CONFIG
@@ -29,7 +29,11 @@
 #include <features.h>
 #endif
 
-#include "CPortability.h"
+#include <folly/CPortability.h>
+
+#ifdef __APPLE__
+# include <malloc/malloc.h>
+#endif
 
 #if FOLLY_HAVE_SCHED_H
  #include <sched.h>
@@ -64,6 +68,7 @@ struct MaxAlign { char c; } __attribute__((__aligned__));
 # ifdef _USE_ATTRIBUTES_FOR_SAL
 #    undef _USE_ATTRIBUTES_FOR_SAL
 # endif
+/* nolint */
 # define _USE_ATTRIBUTES_FOR_SAL 1
 # include <sal.h>
 # define FOLLY_PRINTF_FORMAT _Printf_format_string_
@@ -74,6 +79,13 @@ struct MaxAlign { char c; } __attribute__((__aligned__));
   __attribute__((__format__(__printf__, format_param, dots_param)))
 #endif
 
+// deprecated
+#if defined(__clang__) || defined(__GNUC__)
+# define FOLLY_DEPRECATED(msg) __attribute__((__deprecated__(msg)))
+#else
+# define FOLLY_DEPRECATED
+#endif
+
 // noreturn
 #if defined(_MSC_VER)
 # define FOLLY_NORETURN __declspec(noreturn)
@@ -108,6 +120,12 @@ struct MaxAlign { char c; } __attribute__((__aligned__));
 # define FOLLY_X64 0
 #endif
 
+#if defined(__aarch64__)
+# define FOLLY_A64 1
+#else
+# define FOLLY_A64 0
+#endif
+
 // packing is very ugly in msvc
 #ifdef _MSC_VER
 # define FOLLY_PACK_ATTR /**/
@@ -126,9 +144,11 @@ struct MaxAlign { char c; } __attribute__((__aligned__));
 // portable version check
 #ifndef __GNUC_PREREQ
 # if defined __GNUC__ && defined __GNUC_MINOR__
+/* nolint */
 #  define __GNUC_PREREQ(maj, min) ((__GNUC__ << 16) + __GNUC_MINOR__ >= \
                                    ((maj) << 16) + (min))
 # else
+/* nolint */
 #  define __GNUC_PREREQ(maj, min) 0
 # endif
 #endif
@@ -149,7 +169,8 @@ struct MaxAlign { char c; } __attribute__((__aligned__));
 /* Platform specific TLS support
  * gcc implements __thread
  * msvc implements __declspec(thread)
- * the semantics are the same (but remember __thread is broken on apple)
+ * the semantics are the same
+ * (but remember __thread has different semantics when using emutls (ex. apple))
  */
 #if defined(_MSC_VER)
 # define FOLLY_TLS __declspec(thread)
@@ -235,6 +256,7 @@ typedef SSIZE_T ssize_t;
 # define strerror_r(errno,buf,len) strerror_s(buf,len,errno)
 
 // compiler specific to compiler specific
+// nolint
 # define __PRETTY_FUNCTION__ __FUNCSIG__
 #endif
 
@@ -245,4 +267,40 @@ using namespace FOLLY_GFLAGS_NAMESPACE;
 }  // namespace gflags
 #endif
 
+// for TARGET_OS_IPHONE
+#ifdef __APPLE__
+#include <TargetConditionals.h>
+#endif
+
+// MacOS doesn't have malloc_usable_size()
+#if defined(__APPLE__) && !defined(FOLLY_HAVE_MALLOC_USABLE_SIZE)
+inline size_t malloc_usable_size(void* ptr) {
+  return malloc_size(ptr);
+}
+#endif
+
+// RTTI may not be enabled for this compilation unit.
+#if defined(__GXX_RTTI) || defined(__cpp_rtti)
+# define FOLLY_HAS_RTTI 1
+#endif
+
+namespace folly {
+
+inline void asm_volatile_pause() {
+#if defined(__i386__) || FOLLY_X64
+  asm volatile ("pause");
+#elif FOLLY_A64
+  asm volatile ("wfe");
+#endif
+}
+inline void asm_pause() {
+#if defined(__i386__) || FOLLY_X64
+  asm ("pause");
+#elif FOLLY_A64
+  asm ("wfe");
+#endif
+}
+
+}
+
 #endif // FOLLY_PORTABILITY_H_