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Overview
| Comment: | Clarify comments and semantics of the process 'bitness' checking in the native library pre-loading code. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | preLoad |
| Files: | files | file ages | folders |
| SHA1: |
77969440cd5a01b466ffa7a48560dc36 |
| User & Date: | mistachkin 2012-04-03 03:18:47 |
Context
|
2012-04-03
| ||
| 03:58 | Simplify the native library pre-loading code. Also, allow the selected processor architecture to be overridden via the environment variable 'PreLoadSQLite_ProcessorArchitecture'. check-in: 48466de4f9 user: mistachkin tags: trunk | |
| 03:18 | Clarify comments and semantics of the process 'bitness' checking in the native library pre-loading code. Closed-Leaf check-in: 77969440cd user: mistachkin tags: preLoad | |
|
2012-04-02
| ||
| 17:58 | Start of work on improving the platform detection in the native library pre-loading code. check-in: 621d22239e user: mistachkin tags: preLoad | |
Changes
Changes to System.Data.SQLite/UnsafeNativeMethods.cs.
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new Dictionary<string, Platform>(
StringComparer.OrdinalIgnoreCase);
//
// NOTE: Setup the list of platform names associated with
// the supported processor architectures.
//
processorArchitecturePlatforms.Add("X86",
new Platform("Win32", 32));
processorArchitecturePlatforms.Add("AMD64",
new Platform("x64", 64));
processorArchitecturePlatforms.Add("IA64",
new Platform("Itanium", 64));
................................................................................
/// </summary>
/// <returns>
/// The number of bits used to represent memory addresses for the
/// current process or zero if this value cannot be determined.
/// </returns>
private static int GetProcessBits()
{
return IntPtr.Size * 8;
}
/////////////////////////////////////////////////////////////////////////
/// <summary>
/// Queries and returns the processor architecture of the current
/// process.
................................................................................
string processorArchitecture = Environment.GetEnvironmentVariable(
"PreLoadSQLite_ProcessorArchitecture");
if (processorArchitecture != null)
return processorArchitecture;
//
// BUGBUG: Will this always be reliable? There seems to be some
// evidence that this is not necessarily 100% reliable on
// some 64-bit platforms for child processes started from
// a WoW64 process (e.g. the Visual Studio debugger).
//
processorArchitecture = Environment.GetEnvironmentVariable(
PROCESSOR_ARCHITECTURE);
if (processorArchitecture != null)
{
if (processorArchitecturePlatforms == null)
return null;
Platform platform;
if (processorArchitecturePlatforms.TryGetValue(
processorArchitecture, out platform) &&
(platform != null) &&
(platform.Bits == GetProcessBits()))
{
return processorArchitecture;
}
}
return null;
#else
//
// BUGBUG: No way to determine this value on the .NET Compact
|
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new Dictionary<string, Platform>(
StringComparer.OrdinalIgnoreCase);
//
// NOTE: Setup the list of platform names associated with
// the supported processor architectures.
//
processorArchitecturePlatforms.Add("x86",
new Platform("Win32", 32));
processorArchitecturePlatforms.Add("AMD64",
new Platform("x64", 64));
processorArchitecturePlatforms.Add("IA64",
new Platform("Itanium", 64));
................................................................................
/// </summary>
/// <returns>
/// The number of bits used to represent memory addresses for the
/// current process or zero if this value cannot be determined.
/// </returns>
private static int GetProcessBits()
{
//
// NOTE: The number of bits used to represent memory addresses for
// the current process is the size of an IntPtr (in bytes),
// multiplied by the number of bits per byte (8).
//
return IntPtr.Size * 8;
}
/////////////////////////////////////////////////////////////////////////
/// <summary>
/// Queries and returns the processor architecture of the current
/// process.
................................................................................
string processorArchitecture = Environment.GetEnvironmentVariable(
"PreLoadSQLite_ProcessorArchitecture");
if (processorArchitecture != null)
return processorArchitecture;
//
// NOTE: We cannot sanity check the processor architecture value
// without the mappings between processor architecture names
// and platform bits; therefore, return null in that case.
//
if (processorArchitecturePlatforms != null)
{
//
// BUGBUG: Will this always be reliable?
//
processorArchitecture = Environment.GetEnvironmentVariable(
PROCESSOR_ARCHITECTURE);
if (processorArchitecture != null)
{
Platform platform;
if (processorArchitecturePlatforms.TryGetValue(
processorArchitecture, out platform) &&
(platform != null) &&
(platform.Bits == GetProcessBits()))
{
return processorArchitecture;
}
}
}
return null;
#else
//
// BUGBUG: No way to determine this value on the .NET Compact
|