Add per-thread cache to malloc

[thirdparty/glibc.git] / include / features.h

diff --git a/include/features.h b/include/features.h
index 650d4c5e129518dbec0d6d4eecf9d7ebff7fdfd5..972cbd2b5d5244a3b52f4a5a892df4c29fc7de2c 100644 (file)
--- a/include/features.h
+++ b/include/features.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2017 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -24,10 +24,15 @@
    __STRICT_ANSI__     ISO Standard C.
    _ISOC99_SOURCE      Extensions to ISO C89 from ISO C99.
    _ISOC11_SOURCE      Extensions to ISO C99 from ISO C11.
-   __STDC_WANT_LIB_EXT2__ Extensions to ISO C99 from TR 27431-2:2010.
-   __STDC_WANT_IEC_60559_BFP_EXT__ Extensions to ISO C11 from TS 18661-1:2014.
-   __STDC_WANT_IEC_60559_FUNCS_EXT__ Extensions to ISO C11 from
-                       TS 18661-4:2015.
+   __STDC_WANT_LIB_EXT2__
+                       Extensions to ISO C99 from TR 27431-2:2010.
+   __STDC_WANT_IEC_60559_BFP_EXT__
+                       Extensions to ISO C11 from TS 18661-1:2014.
+   __STDC_WANT_IEC_60559_FUNCS_EXT__
+                       Extensions to ISO C11 from TS 18661-4:2015.
+   __STDC_WANT_IEC_60559_TYPES_EXT__
+                       Extensions to ISO C11 from TS 18661-3:2015.
+
    _POSIX_SOURCE       IEEE Std 1003.1.
    _POSIX_C_SOURCE     If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2;
                        if >=199309L, add IEEE Std 1003.1b-1993;
@@ -45,10 +50,12 @@
    _GNU_SOURCE         All of the above, plus GNU extensions.
    _DEFAULT_SOURCE     The default set of features (taking precedence over
                        __STRICT_ANSI__).
-   _REENTRANT          Select additionally reentrant object.
-   _THREAD_SAFE                Same as _REENTRANT, often used by other systems.
-   _FORTIFY_SOURCE     If set to numeric value > 0 additional security
-                       measures are defined, according to level.
+
+   _FORTIFY_SOURCE     Add security hardening to many library functions.
+                       Set to 1 or 2; 2 performs stricter checks than 1.
+
+   _REENTRANT, _THREAD_SAFE
+                       Obsolete; equivalent to _POSIX_C_SOURCE=199506L.
 
    The `-ansi' switch to the GNU C compiler, and standards conformance
    options such as `-std=c99', define __STRICT_ANSI__.  If none of
@@ -86,7 +93,6 @@
    __USE_MISC          Define things from 4.3BSD or System V Unix.
    __USE_ATFILE                Define *at interfaces and AT_* constants for them.
    __USE_GNU           Define GNU extensions.
-   __USE_REENTRANT     Define reentrant/thread-safe *_r functions.
    __USE_FORTIFY_LEVEL Additional security measures used, according to level.
 
    The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are
@@ -130,9 +136,9 @@
 #undef __USE_MISC
 #undef __USE_ATFILE
 #undef __USE_GNU
-#undef __USE_REENTRANT
 #undef __USE_FORTIFY_LEVEL
 #undef __KERNEL_STRICT_NAMES
+#undef __GLIBC_USE_DEPRECATED_GETS
 
 /* Suppress kernel-name space pollution unless user expressedly asks
    for it.  */
@@ -253,6 +259,7 @@
 # undef  _POSIX_C_SOURCE
 # define _POSIX_C_SOURCE       200809L
 #endif
+
 #if ((!defined __STRICT_ANSI__                                 \
       || (defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) >= 500))        \
      && !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE)
@@ -269,6 +276,19 @@
 # define __USE_POSIX_IMPLICITLY        1
 #endif
 
+/* Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
+   defined in all multithreaded code.  GNU libc has not required this
+   for many years.  We now treat them as compatibility synonyms for
+   _POSIX_C_SOURCE=199506L, which is the earliest level of POSIX with
+   comprehensive support for multithreaded code.  Using them never
+   lowers the selected level of POSIX conformance, only raises it.  */
+#if ((!defined _POSIX_C_SOURCE || (_POSIX_C_SOURCE - 0) < 199506L) \
+     && (defined _REENTRANT || defined _THREAD_SAFE))
+# define _POSIX_SOURCE   1
+# undef  _POSIX_C_SOURCE
+# define _POSIX_C_SOURCE 199506L
+#endif
+
 #if (defined _POSIX_SOURCE                                     \
      || (defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 1)      \
      || defined _XOPEN_SOURCE)
@@ -351,10 +371,6 @@
 # define __USE_GNU     1
 #endif
 
-#if defined _REENTRANT || defined _THREAD_SAFE
-# define __USE_REENTRANT       1
-#endif
-
 #if defined _FORTIFY_SOURCE && _FORTIFY_SOURCE > 0
 # if !defined __OPTIMIZE__ || __OPTIMIZE__ <= 0
 #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
@@ -370,6 +386,16 @@
 # define __USE_FORTIFY_LEVEL 0
 #endif
 
+/* The function 'gets' existed in C89, but is impossible to use
+   safely.  It has been removed from ISO C11 and ISO C++14.  Note: for
+   compatibility with various implementations of <cstdio>, this test
+   must consider only the value of __cplusplus when compiling C++.  */
+#if defined __cplusplus ? __cplusplus >= 201402L : defined __USE_ISOC11
+# define __GLIBC_USE_DEPRECATED_GETS 0
+#else
+# define __GLIBC_USE_DEPRECATED_GETS 1
+#endif
+
 /* Get definitions of __STDC_* predefined macros, if the compiler has
    not preincluded this header automatically.  */
 #include <stdc-predef.h>
@@ -386,7 +412,7 @@
 /* Major and minor version number of the GNU C library package.  Use
    these macros to test for features in specific releases.  */
 #define        __GLIBC__       2
-#define        __GLIBC_MINOR__ 24
+#define        __GLIBC_MINOR__ 25
 
 #define __GLIBC_PREREQ(maj, min) \
        ((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min))