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properly detect windows version to initialize half-open connection limit

This commit is contained in:
Arvid Norberg 2010-03-31 02:50:09 +00:00
parent 4c4c7f832a
commit 310dd7d6f3
2 changed files with 62 additions and 4 deletions
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1
ChangeLog
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@ -26,6 +26,7 @@
incoming connection
* added more detailed instrumentation of the disk I/O thread
* properly detect windows version to initialize half-open connection limit
* fixed bug in url encoder where $ would not be encoded
0.15 release

65
src/session_impl.cpp
View File

@ -531,16 +531,73 @@ namespace aux {
#ifdef WIN32
// windows XP has a limit on the number of
// simultaneous half-open TCP connections
DWORD windows_version = ::GetVersion();
if ((windows_version & 0xff) >= 6)
// here's a table:
// windows version half-open connections limit
// --------------------- ---------------------------
// XP sp1 and earlier infinite
// earlier than vista 8
// vista sp1 and earlier 5
// vista sp2 and later infinite
// windows release version number
// ----------------------------------- --------------
// Windows 7 6.1
// Windows Server 2008 R2 6.1
// Windows Server 2008 6.0
// Windows Vista 6.0
// Windows Server 2003 R2 5.2
// Windows Home Server 5.2
// Windows Server 2003 5.2
// Windows XP Professional x64 Edition 5.2
// Windows XP 5.1
// Windows 2000 5.0
OSVERSIONINFOEX osv;
memset(&osv, 0, sizeof(osv));
osv.dwOSVersionInfoSize = sizeof(osv);
GetVersionEx((OSVERSIONINFO*)&osv);
// the low two bytes of windows_version is the actual
// version.
boost::uint32_t windows_version
= ((osv.dwMajorVersion & 0xff) << 16)
| ((osv.dwMinorVersion & 0xff) << 8);
| (osv.wServicePackMajor & 0xff);
// this is the format of windows_version
// xx xx xx
// | | |
// | | + service pack version
// | + minor version
// + major version
// the least significant byte is the major version
// and the most significant one is the minor version
if (windows_version >= 0x060100)
{
// windows 7 and up doesn't have a half-open limit
m_half_open.limit(0);
}
else if (windows_version >= 0x060002)
{
// on vista SP 2 and up, there's no limit
m_half_open.limit(0);
}
else if (windows_version >= 0x060000)
{
// on vista the limit is 5 (in home edition)
m_half_open.limit(4);
}
else if (windows_version >= 0x050102)
{
// on XP SP2 the limit is 10
m_half_open.limit(9);
}
else
{
// on XP SP2 it's 10
m_half_open.limit(8);
// before XP SP2, there was no limit
m_half_open.limit(0);
}
#endif