No. Threads are not copied on fork(). POSIX specification says (emphasize is mine): fork – create a new process A process shall be created with a single thread. If a multi-threaded process calls fork(), the new process shall contain a replica of the calling thread and its entire address space, possibly including the states of … Read more
Using StandardOutput.BaseStream is the correct approach, but you must not use any other property or method of cmdProcess.StandardOutput. For example, accessing cmdProcess.StandardOutput.EndOfStream will cause the StreamReader for StandardOutput to read part of the stream, removing the data you want to access. Instead, simply read and parse the data from br (assuming you know how to … Read more
As PSkocik points out, it is possible to run a process in its own process group, in most shells, by activating job control (“monitor mode”). (set -m; exec process_in_its_own_group) Linux has a setsid utility, which runs the command passed as argument in its own session (using the eponymous system call). This is stronger than running … Read more
You’re not using call right. Look at the introduction or any of the examples in the docs. The first argument of call is “args”, a sequence of arguments, where arg[0] is the program to run. So, when you do this: s.call(“gpio -g read 17”) There are two ways subprocess could interpret this. It should run … Read more
Performance Counters – Process – % Processor Time. Little sample code to give you the idea: using System; using System.Diagnostics; using System.Threading; namespace StackOverflow { class Program { static void Main(string[] args) { PerformanceCounter myAppCpu = new PerformanceCounter( “Process”, “% Processor Time”, “OUTLOOK”, true); Console.WriteLine(“Press the any key to stop…\n”); while (!Console.KeyAvailable) { double pct … Read more
You are trying to execute /home and it is not an executable file. The constructor argument of the process builder is the command to execute. You want to set the working directory. You can that it via the directory method. Here is a complete example: Process p = null; ProcessBuilder pb = new ProcessBuilder(“do_foo.sh”); pb.directory(new … Read more
No. What you can do is write a loop with kill -0 $PID. If this call fails ($? -ne 0), the process has terminated (after your normal kill): while kill -0 $PID; do sleep 1 done (kudos to qbolec for the code) Related: What does `kill -0 $pid` in a shell script do?
Most modern non-embedded CPUs (x86 and the larger ARM cores, for example) have hardware instructions to compute square roots directly. The hardware implementation backing these instructions varies, but typically is a variant on the schoolbook digit-by-digit algorithm (though not always in base two; base four or sixteen can also be used). These are typically among … Read more
Yes, there is. You want to create two cpusets, one with your isolated CPU and the other with all the rest of the CPUs. Assign your special process to the isolated cpuset and all the rest of the processes to the other cpuset. Here is a simple example script that will do it: mkdir /cpuset … Read more
The qout queue in the subprocess gets full. The data you put in it from foo() doesn’t fit in the buffer of the OS’s pipes used internally, so the subprocess blocks trying to fit more data. But the parent process is not reading this data: it is simply blocked too, waiting for the subprocess to … Read more