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fix computation of winsock fd_set size (#3151)

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* fix computation of winsock fd_set size
This commit is contained in:
pijyoi 2018-06-02 20:16:33 +08:00 committed by Luca Boccassi
parent e2a4d770d8
commit c76ac5474b
1 changed files with 10 additions and 8 deletions
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18
src/polling_util.hpp
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@ -128,30 +128,32 @@ inline size_t valid_pollset_bytes (const fd_set &pollset_)
}
#if defined ZMQ_HAVE_WINDOWS
// struct fd_set {
// u_int fd_count;
// SOCKET fd_array[1];
// };
// NOTE: offsetof(fd_set, fd_array)==sizeof(SOCKET) on both x86 and x64
// due to alignment bytes for the latter.
class optimized_fd_set_t
{
public:
explicit optimized_fd_set_t (size_t nevents_) : _fd_set (nevents_) {}
explicit optimized_fd_set_t (size_t nevents_) : _fd_set (1 + nevents_) {}
fd_set *get () { return reinterpret_cast<fd_set *> (&_fd_set[0]); }
private:
fast_vector_t<char, sizeof (u_int) + ZMQ_POLLITEMS_DFLT * sizeof (SOCKET)>
_fd_set;
fast_vector_t<SOCKET, 1 + ZMQ_POLLITEMS_DFLT> _fd_set;
};
class resizable_optimized_fd_set_t
{
public:
void resize (size_t nevents_) { _fd_set.resize (nevents_); }
void resize (size_t nevents_) { _fd_set.resize (1 + nevents_); }
fd_set *get () { return reinterpret_cast<fd_set *> (&_fd_set[0]); }
private:
resizable_fast_vector_t<char,
sizeof (u_int)
+ ZMQ_POLLITEMS_DFLT * sizeof (SOCKET)>
_fd_set;
resizable_fast_vector_t<SOCKET, 1 + ZMQ_POLLITEMS_DFLT> _fd_set;
};
#else
class optimized_fd_set_t