internal static unsafe void AcquireReservedMutex(ref bool bHandleObtained)
{
SafeWaitHandle handle = null;
bHandleObtained = false;
if (Environment.IsW2k3)
{
if (s_ReservedMutex == null)
{
Win32Native.SECURITY_ATTRIBUTES security_attributes;
MutexSecurity security = new MutexSecurity();
SecurityIdentifier identity = new SecurityIdentifier(WellKnownSidType.WorldSid, null);
security.AddAccessRule(new MutexAccessRule(identity, MutexRights.FullControl, AccessControlType.Allow));
security_attributes = new Win32Native.SECURITY_ATTRIBUTES {
nLength = Marshal.SizeOf(security_attributes)
};
byte[] securityDescriptorBinaryForm = security.GetSecurityDescriptorBinaryForm();
byte * pDest = stackalloc byte[(IntPtr)securityDescriptorBinaryForm.Length];
Buffer.memcpy(securityDescriptorBinaryForm, 0, pDest, 0, securityDescriptorBinaryForm.Length);
security_attributes.pSecurityDescriptor = pDest;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
}
finally
{
handle = Win32Native.CreateMutex(security_attributes, false, @"Global\CLR_RESERVED_MUTEX_NAME");
handle.SetAsReservedMutex();
}
int errorCode = Marshal.GetLastWin32Error();
if (handle.IsInvalid)
{
handle.SetHandleAsInvalid();
__Error.WinIOError(errorCode, @"Global\CLR_RESERVED_MUTEX_NAME");
}
Mutex mutex = new Mutex(handle);
Interlocked.CompareExchange <Mutex>(ref s_ReservedMutex, mutex, null);
}
RuntimeHelpers.PrepareConstrainedRegions();
try
{
}
finally
{
try
{
s_ReservedMutex.WaitOne();
bHandleObtained = true;
}
catch (AbandonedMutexException)
{
bHandleObtained = true;
}
}
}
}
private static int CreateMutexHandle(bool initiallyOwned, string name, Win32Native.SECURITY_ATTRIBUTES securityAttribute, out SafeWaitHandle mutexHandle)
{
bool bHandleObtained = false;
bool flag2 = false;
Label_0004:
mutexHandle = Win32Native.CreateMutex(securityAttribute, initiallyOwned, name);
int num = Marshal.GetLastWin32Error();
if (mutexHandle.IsInvalid && (num == 5))
{
RuntimeHelpers.PrepareConstrainedRegions();
try
{
try
{
}
finally
{
Thread.BeginThreadAffinity();
flag2 = true;
}
AcquireReservedMutex(ref bHandleObtained);
mutexHandle = Win32Native.OpenMutex(0x100001, false, name);
if (!mutexHandle.IsInvalid)
{
num = 0xb7;
}
else
{
num = Marshal.GetLastWin32Error();
}
}
finally
{
if (bHandleObtained)
{
ReleaseReservedMutex();
}
if (flag2)
{
Thread.EndThreadAffinity();
}
}
switch (num)
{
case 2:
goto Label_0004;
case 0:
return(0xb7);
}
}
return(num);
}
private static int CreateMutexHandle(bool initiallyOwned, string name, Win32Native.SECURITY_ATTRIBUTES securityAttribute, out SafeWaitHandle mutexHandle)
{
bool flag = false;
int num;
do
{
mutexHandle = Win32Native.CreateMutex(securityAttribute, initiallyOwned, name);
num = Marshal.GetLastWin32Error();
if (!mutexHandle.IsInvalid || num != 5)
{
return(num);
}
RuntimeHelpers.PrepareConstrainedRegions();
try
{
try
{
}
finally
{
Thread.BeginThreadAffinity();
flag = true;
}
mutexHandle = Win32Native.OpenMutex(1048577, false, name);
if (!mutexHandle.IsInvalid)
{
num = 183;
}
else
{
num = Marshal.GetLastWin32Error();
}
}
finally
{
if (flag)
{
Thread.EndThreadAffinity();
}
}
}while (num == 2);
if (num == 0)
{
num = 183;
}
return(num);
}
static int CreateMutexHandle(bool initiallyOwned, String name, Win32Native.SECURITY_ATTRIBUTES securityAttribute, out SafeWaitHandle mutexHandle)
{
int errorCode;
while (true)
{
mutexHandle = Win32Native.CreateMutex(securityAttribute, initiallyOwned, name);
errorCode = Marshal.GetLastWin32Error();
if (!mutexHandle.IsInvalid)
{
break;
}
if (errorCode != Win32Native.ERROR_ACCESS_DENIED)
{
break;
}
// If a mutex with the name already exists, OS will try to open it with FullAccess.
// It might fail if we don't have enough access. In that case, we try to open the mutex will modify and synchronize access.
RuntimeHelpers.PrepareConstrainedRegions();
mutexHandle = Win32Native.OpenMutex(
Win32Native.MUTEX_MODIFY_STATE | Win32Native.SYNCHRONIZE,
false,
name);
errorCode = !mutexHandle.IsInvalid ? Win32Native.ERROR_ALREADY_EXISTS : Marshal.GetLastWin32Error();
// There could be a race condition here, the other owner of the mutex can free the mutex,
// We need to retry creation in that case.
if (errorCode != Win32Native.ERROR_FILE_NOT_FOUND)
{
if (errorCode == Win32Native.ERROR_SUCCESS)
{
errorCode = Win32Native.ERROR_ALREADY_EXISTS;
}
break;
}
}
return(errorCode);
}
internal static unsafe void AcquireReservedMutex(ref bool bHandleObtained)
{
#if FEATURE_MACL
SafeWaitHandle mutexHandle = null;
int errorCode;
bHandleObtained = false;
if (!Environment.IsW2k3)
{
return;
}
if (s_ReservedMutex == null)
{
// Create a maximally-permissive security descriptor, to ensure we never get an
// ACCESS_DENIED error when calling CreateMutex
MutexSecurity sec = new MutexSecurity();
SecurityIdentifier everyoneSid = new SecurityIdentifier(WellKnownSidType.WorldSid, null);
sec.AddAccessRule(new MutexAccessRule(everyoneSid, MutexRights.FullControl, AccessControlType.Allow));
// For ACL's, get the security descriptor from the MutexSecurity.
Win32Native.SECURITY_ATTRIBUTES secAttrs = new Win32Native.SECURITY_ATTRIBUTES();
secAttrs.nLength = (int)Marshal.SizeOf(secAttrs);
byte[] sd = sec.GetSecurityDescriptorBinaryForm();
byte * bytesOnStack = stackalloc byte[sd.Length];
Buffer.Memcpy(bytesOnStack, 0, sd, 0, sd.Length);
secAttrs.pSecurityDescriptor = bytesOnStack;
RuntimeHelpers.PrepareConstrainedRegions();
try {}
finally {
mutexHandle = Win32Native.CreateMutex(secAttrs, false, c_ReservedMutexName);
// need to set specially, since this mutex cannot lock on itself while closing itself.
mutexHandle.SetAsReservedMutex();
}
errorCode = Marshal.GetLastWin32Error();
if (mutexHandle.IsInvalid)
{
mutexHandle.SetHandleAsInvalid();
__Error.WinIOError(errorCode, c_ReservedMutexName);
}
Mutex m = new Mutex(mutexHandle);
Interlocked.CompareExchange(ref s_ReservedMutex, m, null);
}
RuntimeHelpers.PrepareConstrainedRegions();
try { }
finally {
try {
s_ReservedMutex.WaitOne();
bHandleObtained = true;
}
catch (AbandonedMutexException)
{
// we don't care if another process holding the Mutex was killed
bHandleObtained = true;
}
}
#else
bHandleObtained = true;
#endif
}
static int CreateMutexHandle(bool initiallyOwned, String name, Win32Native.SECURITY_ATTRIBUTES securityAttribute, out SafeWaitHandle mutexHandle)
{
int errorCode;
bool fReservedMutexObtained = false;
bool fAffinity = false;
while (true)
{
mutexHandle = Win32Native.CreateMutex(securityAttribute, initiallyOwned, name);
errorCode = Marshal.GetLastWin32Error();
if (!mutexHandle.IsInvalid)
{
break;
}
if (errorCode == Win32Native.ERROR_ACCESS_DENIED)
{
// If a mutex with the name already exists, OS will try to open it with FullAccess.
// It might fail if we don't have enough access. In that case, we try to open the mutex will modify and synchronize access.
//
RuntimeHelpers.PrepareConstrainedRegions();
try
{
try
{
}
finally
{
#if !FEATURE_CORECLR
Thread.BeginThreadAffinity();
#endif
fAffinity = true;
}
AcquireReservedMutex(ref fReservedMutexObtained);
mutexHandle = Win32Native.OpenMutex(Win32Native.MUTEX_MODIFY_STATE | Win32Native.SYNCHRONIZE, false, name);
if (!mutexHandle.IsInvalid)
{
errorCode = Win32Native.ERROR_ALREADY_EXISTS;
}
else
{
errorCode = Marshal.GetLastWin32Error();
}
}
finally
{
if (fReservedMutexObtained)
{
ReleaseReservedMutex();
}
if (fAffinity)
{
#if !FEATURE_CORECLR
Thread.EndThreadAffinity();
#endif
}
}
// There could be a ---- here, the other owner of the mutex can free the mutex,
// We need to retry creation in that case.
if (errorCode != Win32Native.ERROR_FILE_NOT_FOUND)
{
if (errorCode == Win32Native.ERROR_SUCCESS)
{
errorCode = Win32Native.ERROR_ALREADY_EXISTS;
}
break;
}
}
else
{
break;
}
}
return(errorCode);
}
private static int CreateMutexHandle(bool initiallyOwned, string name, Win32Native.SECURITY_ATTRIBUTES securityAttribute, out SafeWaitHandle mutexHandle)
{
bool flag = false;
bool flag2 = false;
bool flag3 = false;
Label_0006:
flag2 = false;
flag3 = false;
mutexHandle = Win32Native.CreateMutex(securityAttribute, initiallyOwned, name);
int num = Marshal.GetLastWin32Error();
if (!mutexHandle.IsInvalid || (num != 5))
{
return(num);
}
RuntimeHelpers.PrepareConstrainedRegions();
try
{
RuntimeHelpers.PrepareConstrainedRegions();
try
{
}
finally
{
Thread.BeginThreadAffinity();
flag = true;
}
mutexHandle = Win32Native.OpenMutex(0x100001, false, name);
if (!mutexHandle.IsInvalid)
{
num = 0xb7;
if (Environment.IsW2k3)
{
SafeWaitHandle handle = Win32Native.OpenMutex(0x100001, false, name);
if (!handle.IsInvalid)
{
RuntimeHelpers.PrepareConstrainedRegions();
try
{
uint num2 = 0;
IntPtr ptr = mutexHandle.DangerousGetHandle();
IntPtr ptr2 = handle.DangerousGetHandle();
IntPtr[] handles = new IntPtr[] { ptr, ptr2 };
num2 = Win32Native.WaitForMultipleObjects(2, handles, true, 0);
GC.KeepAlive(handles);
if (num2 == uint.MaxValue)
{
if (Marshal.GetLastWin32Error() != 0x57)
{
mutexHandle.Dispose();
flag3 = true;
}
}
else
{
flag2 = true;
if ((num2 >= 0) && (num2 < 2))
{
Win32Native.ReleaseMutex(mutexHandle);
Win32Native.ReleaseMutex(handle);
}
else if ((num2 >= 0x80) && (num2 < 130))
{
Win32Native.ReleaseMutex(mutexHandle);
Win32Native.ReleaseMutex(handle);
}
mutexHandle.Dispose();
}
goto Label_0166;
}
finally
{
handle.Dispose();
}
}
mutexHandle.Dispose();
flag3 = true;
}
}
else
{
num = Marshal.GetLastWin32Error();
}
}
finally
{
if (flag)
{
Thread.EndThreadAffinity();
}
}
Label_0166:
if ((flag2 || flag3) || (num == 2))
{
goto Label_0006;
}
if (num == 0)
{
num = 0xb7;
}
return(num);
}
