How to kill a process in cygwin?
The process is locked from Windows most likely. The error you are getting “couldnt open PID XXX” points to this. To confirm try killing it with windows taskkill taskkill /PID 4760
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Save a process’ memory for later use?
Technically it is possible, but it would require saving all the system-allocated resources state too – like file descriptors for example and then restoring them. So it’s a challenging task. The easiest way to achieve what you want is to use a virtual machine like VMWare. When you pause it you actually save the whole … Read more
How do I read the output of a child process without blocking in Rust?
Streams are blocking by default. TCP/IP streams, filesystem streams, pipe streams, they are all blocking. When you tell a stream to give you a chunk of bytes it will stop and wait till it has the given amout of bytes or till something else happens (an interrupt, an end of stream, an error). The operating … Read more
jvisualvm doesn’t list certain Java processes
Well after I did a little research, it would appear that Peter’s comment was correct. Because the JVM processes were launched by another user (the NETWORK SERVICE account because they were being started by a Windows service) they didn’t show up in jvisualvm. Workaround Since I have access to the application configuration, I have found … Read more
What is kthreadd process and children and how it is different from init and children
Kernel threads are not children of init because they can be started before all the userspace processes. They are typically used to manage hardware that’s why they are directly handled by the kernel and have high priority. For a process to be child of init it needs to be cloned from init and Kthreads aren’t … Read more
System call and context switch
You need to understand that a thread/process context has multiple parts, one, directly associated with execution and is held in the CPU and certain system tables in memory that the CPU uses (e.g. page tables), and the other, which is needed for the OS, for bookkeeping (think of the various IDs, handles, special OS-specific permissions, … Read more
What is the difference between a thread/process/task?
Process: A process is an instance of a computer program that is being executed. It contains the program code and its current activity. Depending on the operating system (OS), a process may be made up of multiple threads of execution that execute instructions concurrently. Process-based multitasking enables you to run the Java compiler at the … Read more
127 Return code from $?
Value 127 is returned by /bin/sh when the given command is not found within your PATH system variable and it is not a built-in shell command. In other words, the system doesn’t understand your command, because it doesn’t know where to find the binary you’re trying to call.