1 //  (C) Copyright John Maddock 2001 - 2003.
2 //  Use, modification and distribution are subject to the
3 //  Boost Software License, Version 1.0. (See accompanying file
4 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
5 
6 
7 //  See http://www.boost.org for most recent version.
8 
9 // All POSIX feature tests go in this file,
10 // Note that we test _POSIX_C_SOURCE and _XOPEN_SOURCE as well
11 // _POSIX_VERSION and _XOPEN_VERSION: on some systems POSIX API's
12 // may be present but none-functional unless _POSIX_C_SOURCE and
13 // _XOPEN_SOURCE have been defined to the right value (it's up
14 // to the user to do this *before* including any header, although
15 // in most cases the compiler will do this for you).
16 
17 #  if defined(BOOST_HAS_UNISTD_H)
18 #     include <unistd.h>
19 
20       // XOpen has <nl_types.h>, but is this the correct version check?
21 #     if defined(_XOPEN_VERSION) && (_XOPEN_VERSION >= 3)
22 #        define BOOST_HAS_NL_TYPES_H
23 #     endif
24 
25       // POSIX version 6 requires <stdint.h>
26 #     if defined(_POSIX_VERSION) && (_POSIX_VERSION >= 200100)
27 #        define BOOST_HAS_STDINT_H
28 #     endif
29 
30       // POSIX version 2 requires <dirent.h>
31 #     if defined(_POSIX_VERSION) && (_POSIX_VERSION >= 199009L)
32 #        define BOOST_HAS_DIRENT_H
33 #     endif
34 
35       // POSIX version 3 requires <signal.h> to have sigaction:
36 #     if defined(_POSIX_VERSION) && (_POSIX_VERSION >= 199506L)
37 #        define BOOST_HAS_SIGACTION
38 #     endif
39       // POSIX defines _POSIX_THREADS > 0 for pthread support,
40       // however some platforms define _POSIX_THREADS without
41       // a value, hence the (_POSIX_THREADS+0 >= 0) check.
42       // Strictly speaking this may catch platforms with a
43       // non-functioning stub <pthreads.h>, but such occurrences should
44       // occur very rarely if at all.
45 #     if defined(_POSIX_THREADS) && (_POSIX_THREADS+0 >= 0) && !defined(BOOST_HAS_WINTHREADS) && !defined(BOOST_HAS_MPTASKS)
46 #        define BOOST_HAS_PTHREADS
47 #     endif
48 
49       // BOOST_HAS_NANOSLEEP:
50       // This is predicated on _POSIX_TIMERS or _XOPEN_REALTIME:
51 #     if (defined(_POSIX_TIMERS) && (_POSIX_TIMERS+0 >= 0)) \
52              || (defined(_XOPEN_REALTIME) && (_XOPEN_REALTIME+0 >= 0))
53 #        define BOOST_HAS_NANOSLEEP
54 #     endif
55 
56       // BOOST_HAS_CLOCK_GETTIME:
57       // This is predicated on _POSIX_TIMERS (also on _XOPEN_REALTIME
58       // but at least one platform - linux - defines that flag without
59       // defining clock_gettime):
60 #     if (defined(_POSIX_TIMERS) && (_POSIX_TIMERS+0 >= 0))
61 #        define BOOST_HAS_CLOCK_GETTIME
62 #     endif
63 
64       // BOOST_HAS_SCHED_YIELD:
65       // This is predicated on _POSIX_PRIORITY_SCHEDULING or
66       // on _POSIX_THREAD_PRIORITY_SCHEDULING or on _XOPEN_REALTIME.
67 #     if defined(_POSIX_PRIORITY_SCHEDULING) && (_POSIX_PRIORITY_SCHEDULING+0 > 0)\
68             || (defined(_POSIX_THREAD_PRIORITY_SCHEDULING) && (_POSIX_THREAD_PRIORITY_SCHEDULING+0 > 0))\
69             || (defined(_XOPEN_REALTIME) && (_XOPEN_REALTIME+0 >= 0))
70 #        define BOOST_HAS_SCHED_YIELD
71 #     endif
72 
73       // BOOST_HAS_GETTIMEOFDAY:
74       // BOOST_HAS_PTHREAD_MUTEXATTR_SETTYPE:
75       // These are predicated on _XOPEN_VERSION, and appears to be first released
76       // in issue 4, version 2 (_XOPEN_VERSION > 500).
77       // Likewise for the functions log1p and expm1.
78 #     if defined(_XOPEN_VERSION) && (_XOPEN_VERSION+0 >= 500)
79 #        define BOOST_HAS_GETTIMEOFDAY
80 #        if defined(_XOPEN_SOURCE) && (_XOPEN_SOURCE+0 >= 500)
81 #           define BOOST_HAS_PTHREAD_MUTEXATTR_SETTYPE
82 #        endif
83 #        ifndef BOOST_HAS_LOG1P
84 #           define BOOST_HAS_LOG1P
85 #        endif
86 #        ifndef BOOST_HAS_EXPM1
87 #           define BOOST_HAS_EXPM1
88 #        endif
89 #     endif
90 
91 #  endif
92 
93 
94 
95 
96