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Marshal.GetThreadFromFiberCookie Method

Note: This API is now obsolete.

Converts a fiber cookie into the corresponding System.Threading.Thread instance.

Namespace:  System.Runtime.InteropServices
Assembly:  mscorlib (in mscorlib.dll)

[ObsoleteAttribute("The GetThreadFromFiberCookie method has been deprecated.  Use the hosting API to perform this operation.", 
public static Thread GetThreadFromFiberCookie(
	int cookie


Type: System.Int32
An integer that represents a fiber cookie.

Return Value

Type: System.Threading.Thread
A thread that corresponds to the cookie parameter.


The cookie parameter is 0.

Fiber cookies are opaque tokens that are used by the host when alerting the common language runtime to its fiber-scheduling decisions. They consist of a stack and register context.

.NET Framework

Supported in: 1.1, 1.0
Obsolete (compiler warning) in 4
Obsolete (compiler warning) in 3.5
Obsolete (compiler warning) in 3.5 SP1
Obsolete (compiler warning) in 3.0
Obsolete (compiler warning) in 3.0 SP1
Obsolete (compiler warning) in 3.0 SP2
Obsolete (compiler warning) in 2.0
Obsolete (compiler warning) in 2.0 SP1
Obsolete (compiler warning) in 2.0 SP2

.NET Framework Client Profile

Obsolete (compiler warning) in 4
Obsolete (compiler warning) in 3.5 SP1

  • SecurityCriticalAttribute 

    requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.