config/detail/posix_features.hpp

0001 //  (C) Copyright John Maddock 2001 - 2003.
0002 //  Use, modification and distribution are subject to the
0003 //  Boost Software License, Version 1.0. (See accompanying file
0004 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0005
0006
0007 //  See http://www.boost.org for most recent version.
0008
0009 // All POSIX feature tests go in this file,
0010 // Note that we test _POSIX_C_SOURCE and _XOPEN_SOURCE as well
0011 // _POSIX_VERSION and _XOPEN_VERSION: on some systems POSIX API's
0012 // may be present but none-functional unless _POSIX_C_SOURCE and
0013 // _XOPEN_SOURCE have been defined to the right value (it's up
0014 // to the user to do this *before* including any header, although
0015 // in most cases the compiler will do this for you).
0016
0017 #  if defined(BOOST_HAS_UNISTD_H)
0018 #     include <unistd.h>
0019
0020       // XOpen has <nl_types.h>, but is this the correct version check?
0021 #     if defined(_XOPEN_VERSION) && (_XOPEN_VERSION >= 3)
0022 #        define BOOST_HAS_NL_TYPES_H
0023 #     endif
0024
0025       // POSIX version 6 requires <stdint.h>
0026 #     if defined(_POSIX_VERSION) && (_POSIX_VERSION >= 200100)
0027 #        define BOOST_HAS_STDINT_H
0028 #     endif
0029
0030       // POSIX version 2 requires <dirent.h>
0031 #     if defined(_POSIX_VERSION) && (_POSIX_VERSION >= 199009L)
0032 #        define BOOST_HAS_DIRENT_H
0033 #     endif
0034
0035       // POSIX version 3 requires <signal.h> to have sigaction:
0036 #     if defined(_POSIX_VERSION) && (_POSIX_VERSION >= 199506L)
0037 #        define BOOST_HAS_SIGACTION
0038 #     endif
0039       // POSIX defines _POSIX_THREADS > 0 for pthread support,
0040       // however some platforms define _POSIX_THREADS without
0041       // a value, hence the (_POSIX_THREADS+0 >= 0) check.
0042       // Strictly speaking this may catch platforms with a
0043       // non-functioning stub <pthreads.h>, but such occurrences should
0044       // occur very rarely if at all.
0045 #     if defined(_POSIX_THREADS) && (_POSIX_THREADS+0 >= 0) && !defined(BOOST_HAS_WINTHREADS) && !defined(BOOST_HAS_MPTASKS)
0046 #        define BOOST_HAS_PTHREADS
0047 #     endif
0048
0049       // BOOST_HAS_NANOSLEEP:
0050       // This is predicated on _POSIX_TIMERS or _XOPEN_REALTIME:
0051 #     if (defined(_POSIX_TIMERS) && (_POSIX_TIMERS+0 >= 0)) \
0052              || (defined(_XOPEN_REALTIME) && (_XOPEN_REALTIME+0 >= 0))
0053 #        define BOOST_HAS_NANOSLEEP
0054 #     endif
0055
0056       // BOOST_HAS_CLOCK_GETTIME:
0057       // This is predicated on _POSIX_TIMERS (also on _XOPEN_REALTIME
0058       // but at least one platform - linux - defines that flag without
0059       // defining clock_gettime):
0060 #     if (defined(_POSIX_TIMERS) && (_POSIX_TIMERS+0 >= 0))
0061 #        define BOOST_HAS_CLOCK_GETTIME
0062 #     endif
0063
0064       // BOOST_HAS_SCHED_YIELD:
0065       // This is predicated on _POSIX_PRIORITY_SCHEDULING or
0066       // on _POSIX_THREAD_PRIORITY_SCHEDULING or on _XOPEN_REALTIME.
0067 #     if defined(_POSIX_PRIORITY_SCHEDULING) && (_POSIX_PRIORITY_SCHEDULING+0 > 0)\
0068             || (defined(_POSIX_THREAD_PRIORITY_SCHEDULING) && (_POSIX_THREAD_PRIORITY_SCHEDULING+0 > 0))\
0069             || (defined(_XOPEN_REALTIME) && (_XOPEN_REALTIME+0 >= 0))
0070 #        define BOOST_HAS_SCHED_YIELD
0071 #     endif
0072
0073       // BOOST_HAS_GETTIMEOFDAY:
0074       // BOOST_HAS_PTHREAD_MUTEXATTR_SETTYPE:
0075       // These are predicated on _XOPEN_VERSION, and appears to be first released
0076       // in issue 4, version 2 (_XOPEN_VERSION > 500).
0077       // Likewise for the functions log1p and expm1.
0078 #     if defined(_XOPEN_VERSION) && (_XOPEN_VERSION+0 >= 500)
0079 #        define BOOST_HAS_GETTIMEOFDAY
0080 #        if defined(_XOPEN_SOURCE) && (_XOPEN_SOURCE+0 >= 500)
0081 #           define BOOST_HAS_PTHREAD_MUTEXATTR_SETTYPE
0082 #        endif
0083 #        ifndef BOOST_HAS_LOG1P
0084 #           define BOOST_HAS_LOG1P
0085 #        endif
0086 #        ifndef BOOST_HAS_EXPM1
0087 #           define BOOST_HAS_EXPM1
0088 #        endif
0089 #     endif
0090
0091 #  endif
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