/// <summary>
/// Workitem 7889: handle ERROR_LOCK_VIOLATION during read
/// </summary>
/// <remarks>
/// This could be gracefully handled with an extension attribute, but
/// This assembly is built for .NET 2.0, so I cannot use them.
/// </remarks>
internal static int ReadWithRetry(System.IO.Stream s, byte[] buffer, int offset, int count, string FileName)
{
int n = 0;
bool done = false;
#if !NETCF && !SILVERLIGHT
int retries = 0;
#endif
do
{
try
{
n = s.Read(buffer, offset, count);
done = true;
}
#if NETCF || SILVERLIGHT
catch (System.IO.IOException)
{
throw;
}
#else
catch (System.IO.IOException ioexc1)
{
// Check if we can call GetHRForException,
// which makes unmanaged code calls.
var p = new System.Security.Permissions.SecurityPermission(
System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode);
if (p.IsUnrestricted())
{
uint hresult = _HRForException(ioexc1);
if (hresult != 0x80070021) // ERROR_LOCK_VIOLATION
{
throw new System.IO.IOException(String.Format("Cannot read file {0}", FileName), ioexc1);
}
retries++;
if (retries > 10)
{
throw new System.IO.IOException(String.Format("Cannot read file {0}, at offset 0x{1:X8} after 10 retries", FileName, offset), ioexc1);
}
// max time waited on last retry = 250 + 10*550 = 5.75s
// aggregate time waited after 10 retries: 250 + 55*550 = 30.5s
System.Threading.Thread.Sleep(250 + retries * 550);
}
else
{
// The permission.Demand() failed. Therefore, we cannot call
// GetHRForException, and cannot do the subtle handling of
// ERROR_LOCK_VIOLATION. Just bail.
throw;
}
}
#endif
}while (!done);
return(n);
}
/// <summary>
/// Workitem 7889: handle ERROR_LOCK_VIOLATION during read
/// </summary>
/// <remarks>
/// This could be gracefully handled with an extension attribute, but
/// This assembly is built for .NET 2.0, so I cannot use them.
/// </remarks>
internal static int ReadWithRetry(System.IO.Stream s, byte[] buffer, int offset, int count, string FileName)
{
int n = 0;
bool done = false;
#if !NETCF && !SILVERLIGHT
int retries = 0;
#endif
do
{
try
{
n = s.Read(buffer, offset, count);
done = true;
}
#if NETCF || SILVERLIGHT
catch (System.IO.IOException)
{
throw;
}
#else
catch (System.IO.IOException ioexc1)
{
// Check if we can call GetHRForException,
// which makes unmanaged code calls.
var p = new System.Security.Permissions.SecurityPermission(
System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode);
if (p.IsUnrestricted())
{
uint hresult = _HRForException(ioexc1);
if (hresult != 0x80070021) // ERROR_LOCK_VIOLATION
throw new System.IO.IOException(String.Format("Cannot read file {0}", FileName), ioexc1);
retries++;
if (retries > 10)
throw new System.IO.IOException(String.Format("Cannot read file {0}, at offset 0x{1:X8} after 10 retries", FileName, offset), ioexc1);
// max time waited on last retry = 250 + 10*550 = 5.75s
// aggregate time waited after 10 retries: 250 + 55*550 = 30.5s
System.Threading.Thread.Sleep(250 + retries * 550);
}
else
{
// The permission.Demand() failed. Therefore, we cannot call
// GetHRForException, and cannot do the subtle handling of
// ERROR_LOCK_VIOLATION. Just bail.
throw;
}
}
#endif
}
while (!done);
return n;
}
