| 1 | |
|---|---|
| 2 | // Copyright Oliver Kowalke 2009. |
| 3 | // Distributed under the Boost Software License, Version 1.0. |
| 4 | // (See accompanying file LICENSE_1_0.txt or copy at |
| 5 | // http://www.boost.org/LICENSE_1_0.txt) |
| 6 | |
| 7 | #include "boost/coroutine/stack_traits.hpp" |
| 8 | |
| 9 | extern "C"{ |
| 10 | #include <signal.h> |
| 11 | #include <sys/resource.h> |
| 12 | #include <sys/time.h> |
| 13 | #include <unistd.h> |
| 14 | } |
| 15 | |
| 16 | //#if _POSIX_C_SOURCE >= 200112L |
| 17 | |
| 18 | #include <algorithm> |
| 19 | #include <cmath> |
| 20 | |
| 21 | #include <boost/assert.hpp> |
| 22 | #include <boost/config.hpp> |
| 23 | |
| 24 | #if !defined (SIGSTKSZ) |
| 25 | # define SIGSTKSZ (8 * 1024) |
| 26 | # define UDEF_SIGSTKSZ |
| 27 | #endif |
| 28 | |
| 29 | #ifdef BOOST_HAS_ABI_HEADERS |
| 30 | # include BOOST_ABI_PREFIX |
| 31 | #endif |
| 32 | |
| 33 | namespace { |
| 34 | |
| 35 | std::size_t pagesize() |
| 36 | { |
| 37 | // conform to POSIX.1-2001 |
| 38 | return ::sysconf( _SC_PAGESIZE); |
| 39 | } |
| 40 | |
| 41 | rlim_t stacksize_limit_() |
| 42 | { |
| 43 | rlimit limit; |
| 44 | // conforming to POSIX.1-2001 |
| 45 | #if defined(BOOST_DISABLE_ASSERTS) || defined(NDEBUG) |
| 46 | ::getrlimit( RLIMIT_STACK, rlimits: & limit); |
| 47 | #else |
| 48 | const int result = ::getrlimit( RLIMIT_STACK, & limit); |
| 49 | BOOST_ASSERT( 0 == result); |
| 50 | #endif |
| 51 | return limit.rlim_max; |
| 52 | } |
| 53 | |
| 54 | rlim_t stacksize_limit() BOOST_NOEXCEPT_OR_NOTHROW { |
| 55 | static rlim_t limit = stacksize_limit_(); |
| 56 | return limit; |
| 57 | } |
| 58 | |
| 59 | } |
| 60 | |
| 61 | namespace boost { |
| 62 | namespace coroutines { |
| 63 | |
| 64 | bool |
| 65 | stack_traits::is_unbounded() BOOST_NOEXCEPT |
| 66 | { return RLIM_INFINITY == stacksize_limit(); } |
| 67 | |
| 68 | std::size_t |
| 69 | stack_traits::page_size() BOOST_NOEXCEPT |
| 70 | { |
| 71 | static std::size_t size = pagesize(); |
| 72 | return size; |
| 73 | } |
| 74 | |
| 75 | std::size_t |
| 76 | stack_traits::default_size() BOOST_NOEXCEPT |
| 77 | { |
| 78 | std::size_t size = 8 * minimum_size(); |
| 79 | if ( is_unbounded() ) return size; |
| 80 | |
| 81 | BOOST_ASSERT( maximum_size() >= minimum_size() ); |
| 82 | return maximum_size() == size |
| 83 | ? size |
| 84 | : (std::min)( a: size, b: maximum_size() ); |
| 85 | } |
| 86 | |
| 87 | std::size_t |
| 88 | stack_traits::minimum_size() BOOST_NOEXCEPT |
| 89 | { return SIGSTKSZ; } |
| 90 | |
| 91 | std::size_t |
| 92 | stack_traits::maximum_size() BOOST_NOEXCEPT |
| 93 | { |
| 94 | BOOST_ASSERT( ! is_unbounded() ); |
| 95 | return static_cast< std::size_t >( stacksize_limit() ); |
| 96 | } |
| 97 | |
| 98 | }} |
| 99 | |
| 100 | #ifdef BOOST_HAS_ABI_HEADERS |
| 101 | # include BOOST_ABI_SUFFIX |
| 102 | #endif |
| 103 | |
| 104 | #ifdef UDEF_SIGSTKSZ |
| 105 | # undef SIGSTKSZ |
| 106 | #endif |
| 107 |