public override bool Equals(Object obj)
{
if (obj == null || !(obj is ExecutionContextSwitcher))
{
return(false);
}
ExecutionContextSwitcher sw = (ExecutionContextSwitcher)obj;
return(this.prevEC == sw.prevEC && this.currEC == sw.currEC && this.scsw == sw.scsw &&
this.sysw == sw.sysw && this.hecsw == sw.hecsw && this.thread == sw.thread);
}
internal static void RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, bool preserveSyncCtx)
{
Contract.Assert(executionContext != null);
if (executionContext.IsPreAllocatedDefault)
{
Contract.Assert(executionContext.IsDefaultFTContext(preserveSyncCtx));
}
else
{
Contract.Assert(executionContext.isNewCapture);
executionContext.isNewCapture = false;
}
Thread currentThread = Thread.CurrentThread;
ExecutionContextSwitcher ecsw = default(ExecutionContextSwitcher);
RuntimeHelpers.PrepareConstrainedRegions();
try
{
ExecutionContext.Reader ec = currentThread.GetExecutionContextReader();
if ((ec.IsNull || ec.IsDefaultFTContext(preserveSyncCtx)) &&
#if FEATURE_IMPERSONATION || FEATURE_COMPRESSEDSTACK
SecurityContext.CurrentlyInDefaultFTSecurityContext(ec) &&
#endif // #if FEATURE_IMPERSONATION || FEATURE_COMPRESSEDSTACK
executionContext.IsDefaultFTContext(preserveSyncCtx))
{
// Neither context is interesting, so we don't need to set the context.
// We do need to reset any changes made by the user's callback,
// so here we establish a "copy-on-write scope". Any changes will
// result in a copy of the context being made, preserving the original
// context.
EstablishCopyOnWriteScope(currentThread, true, ref ecsw);
}
else
{
if (executionContext.IsPreAllocatedDefault)
{
executionContext = executionContext.CreateCopy();
}
ecsw = SetExecutionContext(executionContext, preserveSyncCtx);
}
//
// Call the user's callback
//
callback(state);
}
finally
{
ecsw.Undo(currentThread);
}
}
internal static ExecutionContextSwitcher SetExecutionContext(ExecutionContext executionContext)
{
StackCrawlMark lookForMyCaller = StackCrawlMark.LookForMyCaller;
ExecutionContextSwitcher switcher = new ExecutionContextSwitcher {
thread = System.Threading.Thread.CurrentThread,
prevEC = System.Threading.Thread.CurrentThread.GetExecutionContextNoCreate(),
currEC = executionContext
};
System.Threading.Thread.CurrentThread.SetExecutionContext(executionContext);
RuntimeHelpers.PrepareConstrainedRegions();
try
{
if (executionContext == null)
{
return(switcher);
}
System.Security.SecurityContext securityContext = executionContext.SecurityContext;
if (securityContext != null)
{
System.Security.SecurityContext prevSecurityContext = (switcher.prevEC != null) ? switcher.prevEC.SecurityContext : null;
switcher.scsw = System.Security.SecurityContext.SetSecurityContext(securityContext, prevSecurityContext, ref lookForMyCaller);
}
else if (!System.Security.SecurityContext.CurrentlyInDefaultFTSecurityContext(switcher.prevEC))
{
System.Security.SecurityContext context3 = (switcher.prevEC != null) ? switcher.prevEC.SecurityContext : null;
switcher.scsw = System.Security.SecurityContext.SetSecurityContext(System.Security.SecurityContext.FullTrustSecurityContext, context3, ref lookForMyCaller);
}
System.Threading.SynchronizationContext synchronizationContext = executionContext.SynchronizationContext;
if (synchronizationContext != null)
{
System.Threading.SynchronizationContext prevSyncContext = (switcher.prevEC != null) ? switcher.prevEC.SynchronizationContext : null;
switcher.sysw = System.Threading.SynchronizationContext.SetSynchronizationContext(synchronizationContext, prevSyncContext);
}
System.Threading.HostExecutionContext hostExecutionContext = executionContext.HostExecutionContext;
if (hostExecutionContext != null)
{
switcher.hecsw = HostExecutionContextManager.SetHostExecutionContextInternal(hostExecutionContext);
}
}
catch
{
switcher.UndoNoThrow();
throw;
}
return(switcher);
}
internal static ExecutionContextSwitcher SetExecutionContext(ExecutionContext executionContext, bool preserveSyncCtx)
{
StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller;
ExecutionContextSwitcher executionContextSwitcher = new ExecutionContextSwitcher();
Thread currentThread = Thread.CurrentThread;
ExecutionContext.Reader executionContextReader = currentThread.GetExecutionContextReader();
executionContextSwitcher.thread = currentThread;
executionContextSwitcher.outerEC = executionContextReader;
executionContextSwitcher.outerECBelongsToScope = currentThread.ExecutionContextBelongsToCurrentScope;
if (preserveSyncCtx)
{
executionContext.SynchronizationContext = executionContextReader.SynchronizationContext;
}
executionContext.SynchronizationContextNoFlow = executionContextReader.SynchronizationContextNoFlow;
currentThread.SetExecutionContext(executionContext, true);
RuntimeHelpers.PrepareConstrainedRegions();
try
{
ExecutionContext.OnAsyncLocalContextChanged(executionContextReader.DangerousGetRawExecutionContext(), executionContext);
SecurityContext securityContext1 = executionContext.SecurityContext;
if (securityContext1 != null)
{
SecurityContext.Reader securityContext2 = executionContextReader.SecurityContext;
executionContextSwitcher.scsw = SecurityContext.SetSecurityContext(securityContext1, securityContext2, false, ref stackMark);
}
else if (!SecurityContext.CurrentlyInDefaultFTSecurityContext(executionContextSwitcher.outerEC))
{
SecurityContext.Reader securityContext2 = executionContextReader.SecurityContext;
executionContextSwitcher.scsw = SecurityContext.SetSecurityContext(SecurityContext.FullTrustSecurityContext, securityContext2, false, ref stackMark);
}
HostExecutionContext executionContext1 = executionContext.HostExecutionContext;
if (executionContext1 != null)
{
executionContextSwitcher.hecsw = HostExecutionContextManager.SetHostExecutionContextInternal(executionContext1);
}
}
catch
{
executionContextSwitcher.UndoNoThrow();
throw;
}
return(executionContextSwitcher);
}
public static void Run(ExecutionContext executionContext, ContextCallback callback, Object state)
{
ExecutionContextSwitcher ecsw = default(ExecutionContextSwitcher);
try
{
EstablishCopyOnWriteScope(ref ecsw);
ExecutionContext.Restore(executionContext);
callback(state);
}
catch
{
// Note: we have a "catch" rather than a "finally" because we want
// to stop the first pass of EH here. That way we can restore the previous
// context before any of our callers' EH filters run. That means we need to
// end the scope separately in the non-exceptional case below.
ecsw.Undo();
throw;
}
ecsw.Undo();
}
static internal void EstablishCopyOnWriteScope(ref ExecutionContextSwitcher ecsw)
{
ecsw.m_ec = Capture();
ecsw.m_sc = SynchronizationContext.CurrentExplicit;
}
static internal void EstablishCopyOnWriteScope(Thread currentThread, ref ExecutionContextSwitcher ecsw)
{
Contract.Assert(currentThread == Thread.CurrentThread);
ecsw.m_ec = currentThread.ExecutionContext;
ecsw.m_sc = currentThread.SynchronizationContext;
}
static internal void EstablishCopyOnWriteScope(ref ExecutionContextSwitcher ecsw)
{
ecsw.m_ec = Capture();
ecsw.m_sc = SynchronizationContext.CurrentNoFlow;
}
[HandleProcessCorruptedStateExceptions] //
#endif // FEATURE_CORRUPTING_EXCEPTIONS
internal static ExecutionContextSwitcher SetExecutionContext(ExecutionContext executionContext, bool preserveSyncCtx)
{
#if FEATURE_IMPERSONATION || FEATURE_COMPRESSEDSTACK
StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller;
#endif // #if FEATURE_IMPERSONATION || FEATURE_COMPRESSEDSTACK
Contract.Assert(executionContext != null);
Contract.Assert(executionContext != s_dummyDefaultEC);
// Set up the switcher object to return;
ExecutionContextSwitcher ecsw = new ExecutionContextSwitcher();
Thread currentThread = Thread.CurrentThread;
ExecutionContext.Reader outerEC = currentThread.GetExecutionContextReader();
ecsw.thread = currentThread;
ecsw.outerEC = outerEC;
ecsw.outerECBelongsToScope = currentThread.ExecutionContextBelongsToCurrentScope;
if (preserveSyncCtx)
executionContext.SynchronizationContext = outerEC.SynchronizationContext;
executionContext.SynchronizationContextNoFlow = outerEC.SynchronizationContextNoFlow;
currentThread.SetExecutionContext(executionContext, belongsToCurrentScope: true);
RuntimeHelpers.PrepareConstrainedRegions();
try
{
#if FEATURE_IMPERSONATION || FEATURE_COMPRESSEDSTACK
//set the security context
SecurityContext sc = executionContext.SecurityContext;
if (sc != null)
{
// non-null SC: needs to be set
SecurityContext.Reader prevSeC = outerEC.SecurityContext;
ecsw.scsw = SecurityContext.SetSecurityContext(sc, prevSeC, false, ref stackMark);
}
else if (!SecurityContext.CurrentlyInDefaultFTSecurityContext(ecsw.outerEC))
{
// null incoming SC, but we're currently not in FT: use static FTSC to set
SecurityContext.Reader prevSeC = outerEC.SecurityContext;
ecsw.scsw = SecurityContext.SetSecurityContext(SecurityContext.FullTrustSecurityContext, prevSeC, false, ref stackMark);
}
#endif // #if FEATURE_IMPERSONATION || FEATURE_COMPRESSEDSTACK
#if FEATURE_CAS_POLICY
// set the Host Context
HostExecutionContext hostContext = executionContext.HostExecutionContext;
if (hostContext != null)
{
ecsw.hecsw = HostExecutionContextManager.SetHostExecutionContextInternal(hostContext);
}
#endif // FEATURE_CAS_POLICY
}
catch
{
ecsw.UndoNoThrow();
throw;
}
return ecsw;
}
static internal void EstablishCopyOnWriteScope(Thread currentThread, bool knownNullWindowsIdentity, ref ExecutionContextSwitcher ecsw)
{
Contract.Assert(currentThread == Thread.CurrentThread);
ecsw.outerEC = currentThread.GetExecutionContextReader();
ecsw.outerECBelongsToScope = currentThread.ExecutionContextBelongsToCurrentScope;
#if !FEATURE_PAL && FEATURE_IMPERSONATION
ecsw.cachedAlwaysFlowImpersonationPolicy = SecurityContext.AlwaysFlowImpersonationPolicy;
if (knownNullWindowsIdentity)
Contract.Assert(SecurityContext.GetCurrentWI(ecsw.outerEC, ecsw.cachedAlwaysFlowImpersonationPolicy) == null);
else
ecsw.wi = SecurityContext.GetCurrentWI(ecsw.outerEC, ecsw.cachedAlwaysFlowImpersonationPolicy);
ecsw.wiIsValid = true;
#endif
currentThread.ExecutionContextBelongsToCurrentScope = false;
ecsw.thread = currentThread;
}
static internal void EstablishCopyOnWriteScope(Thread currentThread, bool knownNullWindowsIdentity, ref ExecutionContextSwitcher ecsw)
{
Contract.Assert(currentThread == Thread.CurrentThread);
ecsw.outerEC = currentThread.GetExecutionContextReader();
ecsw.outerECBelongsToScope = currentThread.ExecutionContextBelongsToCurrentScope;
#if !FEATURE_PAL && FEATURE_IMPERSONATION
ecsw.cachedAlwaysFlowImpersonationPolicy = SecurityContext.AlwaysFlowImpersonationPolicy;
if (knownNullWindowsIdentity)
{
Contract.Assert(SecurityContext.GetCurrentWI(ecsw.outerEC, ecsw.cachedAlwaysFlowImpersonationPolicy) == null);
}
else
{
ecsw.wi = SecurityContext.GetCurrentWI(ecsw.outerEC, ecsw.cachedAlwaysFlowImpersonationPolicy);
}
ecsw.wiIsValid = true;
#endif
currentThread.ExecutionContextBelongsToCurrentScope = false;
ecsw.thread = currentThread;
}
[HandleProcessCorruptedStateExceptions] //
#endif // FEATURE_CORRUPTING_EXCEPTIONS
internal static ExecutionContextSwitcher SetExecutionContext(ExecutionContext executionContext)
{
Contract.Assert(executionContext != s_dummyDefaultEC);
#if FEATURE_IMPERSONATION || FEATURE_COMPRESSEDSTACK
StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller;
#endif // #if FEATURE_IMPERSONATION || FEATURE_COMPRESSEDSTACK
Contract.Assert(executionContext != null, "ExecutionContext cannot be null here.");
// Set up the switcher object to return;
ExecutionContextSwitcher ecsw = new ExecutionContextSwitcher();
ecsw.thread = Thread.CurrentThread;
ecsw.prevEC = Thread.CurrentThread.GetExecutionContextNoCreate(); // prev
ecsw.currEC = executionContext; //current
// Update the EC on thread
Thread.CurrentThread.SetExecutionContext(executionContext);
RuntimeHelpers.PrepareConstrainedRegions();
try
{
if (executionContext != null)
{
#if FEATURE_IMPERSONATION || FEATURE_COMPRESSEDSTACK
//set the security context
SecurityContext sc = executionContext.SecurityContext;
if (sc != null)
{
// non-null SC: needs to be set
SecurityContext prevSeC = (ecsw.prevEC != null) ? ecsw.prevEC.SecurityContext : null;
ecsw.scsw = SecurityContext.SetSecurityContext(sc, prevSeC, ref stackMark);
}
else if (!SecurityContext.CurrentlyInDefaultFTSecurityContext(ecsw.prevEC))
{
// null incoming SC, but we're currently not in FT: use static FTSC to set
SecurityContext prevSeC = (ecsw.prevEC != null) ? ecsw.prevEC.SecurityContext : null;
ecsw.scsw = SecurityContext.SetSecurityContext(SecurityContext.FullTrustSecurityContext, prevSeC, ref stackMark);
}
#endif // #if FEATURE_IMPERSONATION || FEATURE_COMPRESSEDSTACK
#if FEATURE_SYNCHRONIZATIONCONTEXT
// set the [....] context
SynchronizationContext syncContext = executionContext.SynchronizationContext;
if (syncContext != null)
{
SynchronizationContext prevSyC = (ecsw.prevEC != null) ? ecsw.prevEC.SynchronizationContext : null;
ecsw.sysw = SynchronizationContext.SetSynchronizationContext(syncContext, prevSyC);
}
#endif // #if FEATURE_SYNCHRONIZATIONCONTEXT
#if FEATURE_CAS_POLICY
// set the Host Context
HostExecutionContext hostContext = executionContext.HostExecutionContext;
if (hostContext != null)
{
ecsw.hecsw = HostExecutionContextManager.SetHostExecutionContextInternal(hostContext);
}
#endif // FEATURE_CAS_POLICY
}
}
catch
{
ecsw.UndoNoThrow();
throw;
}
return ecsw;
}
private static void EstablishCopyOnWriteScope(Thread currentThread, bool knownNullWindowsIdentity, ref ExecutionContextSwitcher ecsw)
{
ecsw.outerEC = currentThread.GetExecutionContextReader();
ecsw.outerECBelongsToScope = currentThread.ExecutionContextBelongsToCurrentScope;
ecsw.cachedAlwaysFlowImpersonationPolicy = SecurityContext.AlwaysFlowImpersonationPolicy;
if (!knownNullWindowsIdentity)
{
ecsw.wi = SecurityContext.GetCurrentWI(ecsw.outerEC, ecsw.cachedAlwaysFlowImpersonationPolicy);
}
ecsw.wiIsValid = true;
currentThread.ExecutionContextBelongsToCurrentScope = false;
ecsw.thread = currentThread;
}
internal static void EstablishCopyOnWriteScope(ref ExecutionContextSwitcher ecsw)
{
ExecutionContext.EstablishCopyOnWriteScope(Thread.CurrentThread, false, ref ecsw);
}
internal ExecutionContextRunData(ExecutionContext executionContext, ContextCallback cb, Object state)
{
this.ec = executionContext;
this.callBack = cb;
this.state = state;
ecsw = new ExecutionContextSwitcher();
}
[HandleProcessCorruptedStateExceptions] //
#endif // FEATURE_CORRUPTING_EXCEPTIONS
internal static ExecutionContextSwitcher SetExecutionContext(ExecutionContext executionContext, bool preserveSyncCtx)
{
#if FEATURE_IMPERSONATION || FEATURE_COMPRESSEDSTACK
StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller;
#endif // #if FEATURE_IMPERSONATION || FEATURE_COMPRESSEDSTACK
Contract.Assert(executionContext != null);
Contract.Assert(executionContext != s_dummyDefaultEC);
// Set up the switcher object to return;
ExecutionContextSwitcher ecsw = new ExecutionContextSwitcher();
Thread currentThread = Thread.CurrentThread;
ExecutionContext.Reader outerEC = currentThread.GetExecutionContextReader();
ecsw.thread = currentThread;
ecsw.outerEC = outerEC;
ecsw.outerECBelongsToScope = currentThread.ExecutionContextBelongsToCurrentScope;
if (preserveSyncCtx)
{
executionContext.SynchronizationContext = outerEC.SynchronizationContext;
}
executionContext.SynchronizationContextNoFlow = outerEC.SynchronizationContextNoFlow;
currentThread.SetExecutionContext(executionContext, belongsToCurrentScope: true);
RuntimeHelpers.PrepareConstrainedRegions();
try
{
#if FEATURE_IMPERSONATION || FEATURE_COMPRESSEDSTACK
//set the security context
SecurityContext sc = executionContext.SecurityContext;
if (sc != null)
{
// non-null SC: needs to be set
SecurityContext.Reader prevSeC = outerEC.SecurityContext;
ecsw.scsw = SecurityContext.SetSecurityContext(sc, prevSeC, false, ref stackMark);
}
else if (!SecurityContext.CurrentlyInDefaultFTSecurityContext(ecsw.outerEC))
{
// null incoming SC, but we're currently not in FT: use static FTSC to set
SecurityContext.Reader prevSeC = outerEC.SecurityContext;
ecsw.scsw = SecurityContext.SetSecurityContext(SecurityContext.FullTrustSecurityContext, prevSeC, false, ref stackMark);
}
#endif // #if FEATURE_IMPERSONATION || FEATURE_COMPRESSEDSTACK
#if FEATURE_CAS_POLICY
// set the Host Context
HostExecutionContext hostContext = executionContext.HostExecutionContext;
if (hostContext != null)
{
ecsw.hecsw = HostExecutionContextManager.SetHostExecutionContextInternal(hostContext);
}
#endif // FEATURE_CAS_POLICY
}
catch
{
ecsw.UndoNoThrow();
throw;
}
return(ecsw);
}
internal static ExecutionContextSwitcher SetExecutionContext(ExecutionContext executionContext)
{
StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller;
BCLDebug.Assert(executionContext != null, "ExecutionContext cannot be null here.");
// Set up the switcher object to return;
ExecutionContextSwitcher ecsw = new ExecutionContextSwitcher();
ecsw.thread = Thread.CurrentThread;
ecsw.prevEC = Thread.CurrentThread.GetExecutionContextNoCreate(); // prev
ecsw.currEC = executionContext; //current
// Update the EC on thread
Thread.CurrentThread.SetExecutionContext(executionContext);
RuntimeHelpers.PrepareConstrainedRegions();
try
{
if (executionContext != null)
{
//set the security context
SecurityContext sc = executionContext.SecurityContext;
if (sc != null)
{
// non-null SC: needs to be set
SecurityContext prevSeC = (ecsw.prevEC != null) ? ecsw.prevEC.SecurityContext : null;
ecsw.scsw = SecurityContext.SetSecurityContext(sc, prevSeC, ref stackMark);
}
else if (!SecurityContext.CurrentlyInDefaultFTSecurityContext(ecsw.prevEC))
{
// null incoming SC, but we're currently not in FT: use static FTSC to set
SecurityContext prevSeC = (ecsw.prevEC != null) ? ecsw.prevEC.SecurityContext : null;
ecsw.scsw = SecurityContext.SetSecurityContext(SecurityContext.FullTrustSecurityContext, prevSeC, ref stackMark);
}
// set the sync context
SynchronizationContext syncContext = executionContext.SynchronizationContext;
if (syncContext != null)
{
SynchronizationContext prevSyC = (ecsw.prevEC != null) ? ecsw.prevEC.SynchronizationContext : null;
ecsw.sysw = SynchronizationContext.SetSynchronizationContext(syncContext, prevSyC);
}
// set the Host Context
HostExecutionContext hostContext = executionContext.HostExecutionContext;
if (hostContext != null)
{
ecsw.hecsw = HostExecutionContextManager.SetHostExecutionContextInternal(hostContext);
}
}
}
catch
{
ecsw.UndoNoThrow();
throw;
}
return ecsw;
}
internal static ExecutionContextSwitcher SetExecutionContext(ExecutionContext executionContext)
{
StackCrawlMark lookForMyCaller = StackCrawlMark.LookForMyCaller;
ExecutionContextSwitcher switcher = new ExecutionContextSwitcher {
thread = System.Threading.Thread.CurrentThread,
prevEC = System.Threading.Thread.CurrentThread.GetExecutionContextNoCreate(),
currEC = executionContext
};
System.Threading.Thread.CurrentThread.SetExecutionContext(executionContext);
RuntimeHelpers.PrepareConstrainedRegions();
try
{
if (executionContext == null)
{
return switcher;
}
System.Security.SecurityContext securityContext = executionContext.SecurityContext;
if (securityContext != null)
{
System.Security.SecurityContext prevSecurityContext = (switcher.prevEC != null) ? switcher.prevEC.SecurityContext : null;
switcher.scsw = System.Security.SecurityContext.SetSecurityContext(securityContext, prevSecurityContext, ref lookForMyCaller);
}
else if (!System.Security.SecurityContext.CurrentlyInDefaultFTSecurityContext(switcher.prevEC))
{
System.Security.SecurityContext context3 = (switcher.prevEC != null) ? switcher.prevEC.SecurityContext : null;
switcher.scsw = System.Security.SecurityContext.SetSecurityContext(System.Security.SecurityContext.FullTrustSecurityContext, context3, ref lookForMyCaller);
}
System.Threading.SynchronizationContext synchronizationContext = executionContext.SynchronizationContext;
if (synchronizationContext != null)
{
System.Threading.SynchronizationContext prevSyncContext = (switcher.prevEC != null) ? switcher.prevEC.SynchronizationContext : null;
switcher.sysw = System.Threading.SynchronizationContext.SetSynchronizationContext(synchronizationContext, prevSyncContext);
}
System.Threading.HostExecutionContext hostExecutionContext = executionContext.HostExecutionContext;
if (hostExecutionContext != null)
{
switcher.hecsw = HostExecutionContextManager.SetHostExecutionContextInternal(hostExecutionContext);
}
}
catch
{
switcher.UndoNoThrow();
throw;
}
return switcher;
}