RequestContext support

[folly.git] / folly / Portability.h

diff --git a/folly/Portability.h b/folly/Portability.h
index dd2df1be4110133109e882208995b2d7bb05e02b..fbd8e3aba8786fab5297c0073e5fa5b459c1df0e 100644 (file)
--- a/folly/Portability.h
+++ b/folly/Portability.h
@@ -79,6 +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)
@@ -113,6 +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 /**/
@@ -266,4 +279,28 @@ inline size_t malloc_usable_size(void* 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_