public bool TestLockIsFree()
{
if (LockIO.LockExists(LockFilePath))
{
var lockContent = LockIO.ReadLock(LockFilePath);
//Someone else owns the lock
if (lockContent.GetType() == typeof(OtherProcessOwnsFileLockContent))
{
return(false);
}
//the file no longer exists
if (lockContent.GetType() == typeof(MissingFileLockContent))
{
return(AcquireLock());
}
//This lock belongs to this process - we can reacquire the lock
if (lockContent.PID == Process.GetCurrentProcess().Id)
{
return(AcquireLock());
}
// Check if PID is still alive
if (Process.GetProcesses().Any(x => x.Id == lockContent.PID))
{
return(false);
}
}
return(true);
}
public bool TryAcquireLock()
{
if (LockIO.LockExists(LockFilePath))
{
var lockContent = LockIO.ReadLock(LockFilePath);
//Someone else owns the lock
if (lockContent.GetType() == typeof(OtherProcessOwnsFileLockContent))
{
return(false);
}
//the file no longer exists
if (lockContent.GetType() == typeof(MissingFileLockContent))
{
return(AcquireLock());
}
//This lock belongs to this process - we can reacquire the lock
if (lockContent.PID == Process.GetCurrentProcess().Id)
{
return(AcquireLock());
}
//The process which created it is no longer running
if (!ProcessIsRunning((int)lockContent.PID, lockContent.ProcessName))
{
return(AcquireLock());
}
if (LockTimeout != TimeSpan.Zero)
{
var lockWriteTime = new DateTime(lockContent.Timestamp);
if (!(Math.Abs((DateTime.Now - lockWriteTime).TotalSeconds) > LockTimeout.TotalSeconds))
{
return(false); //The lock has not timed out - we can't acquire it
}
}
else
{
return(false);
}
}
//Acquire the lock
return(AcquireLock());
}
public bool TryAcquireLock()
{
if (LockIO.LockExists(LockFilePath))
{
var lockContent = LockIO.ReadLock(LockFilePath);
//Someone else owns the lock
if (lockContent.GetType() == typeof(OtherProcessOwnsFileLockContent))
{
return(false);
}
//the file no longer exists
if (lockContent.GetType() == typeof(MissingFileLockContent))
{
return(AcquireLock());
}
var lockWriteTime = new DateTime(lockContent.Timestamp);
//This lock belongs to this process - we can reacquire the lock
var currentProcess = Process.GetCurrentProcess();
if (lockContent.PID == currentProcess.Id && lockContent.MachineName == Environment.MachineName)
{
return(AcquireLock());
}
//The lock has not timed out - we can't acquire it
if (!(Math.Abs((DateTime.Now - lockWriteTime).TotalSeconds) > LockTimeout.TotalSeconds))
{
return(false);
}
}
//Acquire the lock
return(AcquireLock());
}