Project managers should communicate to stakeholders what they can expect regarding immediate milestones. Explain to stakeholders that a “project plan” is merely a “projection” of what you expect to happen in the future.įollowing an outdated project plan will merely result in failure. Project managers must be clear and transparent when managing stakeholder expectations. The project may still produce good results. My take from my years of work is that all stakeholders need to be made aware that the initial project milestones are created weeks/months ahead of time, and not all requirements can be known when a project is launched. There is a misconception that if the project team isn’t hitting every milestone on the dates specified, the project is obviously a failure. For long-term success, one should recognize one’s limitations and be transparent in their reporting. To keep the panic mode subdued within, I have learnt that it is best to forewarn them of any potential risks and communicate with these characters on a regular basis with honest project updates, whether good or bad. Mostly placed at the higher ranks (the higher up they are, the more the panic and anxiety created among subordinates) they do not like hearing any bad news, especially without any prior warnings. These are the characters that can create/spread panic when there are project budget overruns or missed deadlines. Kill sends the given signal to the process identified by the process descriptor pd.Grounded Theory | Systematic Design, Emerging Design, Constructivist Approach The Project Characters Because there is no global process table in this kernel, we cannot send a signal to a PID. The valid values for the signal are 2 ( SIGINT), 9 ( SIGKILL), 14 ( SIGALRM), and 17 ( SIGCHLD). The signal values are the same as in Linux, and the signals behave similarly to those of Linux. "libc" defines macros for the signals, so the user can use SIGKILL, rather than 9, for example. Its first parameter is the signal, and its second signal is either (a) a pointer to a signal handler, (b) SIG_IGN which sets the disposition to "Ignore", or (c) SIG_DFL which sets the disposition to the default. SIGKILL always kills the process, and it cannot be caught or ignored.Īlarm arranges for SIGALRM to be sent to this process after the given number of seconds. Signal handlers can accept one parameter if they chose to: a pointer to a struct of type regs.
The following typedef is provided in "libc". a boolean value denoting whether the signal is in a signal handler currently.Processes now have a few extra instance members: This struct is mutable, and changes to it are reflected in the process's execution when it returns from the signal handler. This value is used to avoid deadlocks and race conditions without blocking (as a mutex would). void signal(signal_t sig) adds the signal sig to the signal queue.a context struct that saves the user-mode context of this process whenever we switch to kernel-mode.a list of signal handlers and dispositions.I may decide to implement a tryAndLock() method for mutexes later.
virtual long setSignalAction(signal_t, signal_action_t) to set the disposition of this signal for this process.virtual signal_action_t getSignalAction(signal_t) to get the disposition of this signal for this process.The signal value must be validated beforehand. sigcontext represents the user-mode context of a process.sigframe represents a signal handler's stack frame.signal_action_t defines the different dispositions.signal_t defines the different signals.regs contains the values of the processor defines a number of important structs and enums: The bulk of the kernel's signal implementation is housed in signal.h and. It contains a pointer to the signal handler frame, if there is one, which is used by sys_sigret. ValidateSignal returns true if the given signal is valid (false otherwise).initHandlers initializes the given list of signal handlers and faultDisposition returns the default disposition of the given signal.checkSignals dequeues a single signal from the current process and handles it.Static void initHandlers(uint32_t (&handlers)) Static signal_action_t defaultDisposition(signal_t) Static void checkSignals(SimpleQueue *signals) The Signal class represents a signal and encapsulates the logic of switching to a signal handler.
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