dev@processes

Process Management

Scheduling

Quartz

• Asp.Net Core Windows Service Task Scheduler Daily, Weekly, Monthly: https://sibeeshpassion.com/asp-net-core-windows-service-task-scheduler-daily-weekly-monthly/

Watchers

• Circus (python): http://circus.readthedocs.io/en/latest/
• Supervisord (no Windows): http://supervisord.org/index.html

Piping tasks in a console

• Bullseye: https://codeopinion.com/creating-simple-tasks-in-net-with-bullseye/
  • https://github.com/adamralph/bullseye/

Gracefully terminating a process

Windows

• http://stanislavs.org/stopping-command-line-applications-programatically-with-ctrl-c-events-from-net/
• https://stackoverflow.com/questions/813086/can-i-send-a-ctrl-c-sigint-to-an-application-on-windows
• https://stackoverflow.com/questions/1679876/atexit-exit-delegate-in-c-sharp
• https://stackoverflow.com/questions/177856/how-do-i-trap-ctrl-c-in-a-c-sharp-console-app
• https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/signal
  • https://docs.microsoft.com/en-us/cpp/c-runtime-library/process-and-environment-control
  • NB: SIGINT is not supported for any Win32 application. When a CTRL+C interrupt occurs, Win32 operating systems generate a new thread to specifically handle that interrupt. This can cause a single-thread application, such as one in UNIX, to become multithreaded and cause unexpected behavior.
• taskkill
  • taskkill /pid (without /f): this seems to send WM_CLOSE... And this does not work with console apps...
  • taskkill /pid /f: this forces the termiantion of the process...
• Microsoft's Process Extensions (from ASP.NET Core): https://github.com/aspnet/Common/blob/ffb7c20fb22a31ac31d3a836a8455655867e8e16/shared/Microsoft.Extensions.Process.Sources/ProcessHelper.cs#L22
  • https://github.com/aspnet/Common/pull/360
  • Prefer this impl: https://github.com/aspnet/Common/blob/dev/shared/Microsoft.Extensions.Process.Sources/ProcessHelper.cs

Windows Signals

Copied from <signal.h>

// Signal types
#define SIGINT          2   // interrupt
#define SIGILL          4   // illegal instruction - invalid function image
#define SIGFPE          8   // floating point exception
#define SIGSEGV         11  // segment violation
#define SIGTERM         15  // Software termination signal from kill
#define SIGBREAK        21  // Ctrl-Break sequence
#define SIGABRT         22  // abnormal termination triggered by abort call

#define SIGABRT_COMPAT  6   // SIGABRT compatible with other platforms, same as SIGABRT

Linux / .NET Core

• https://stackoverflow.com/questions/38291567/killing-gracefully-a-net-core-daemon-running-on-linux
• https://github.com/aspnet/Hosting/issues/870
  • https://github.com/dotnet/coreclr/blob/7dfb2ed8614dea8c2fe757592436a38694e91ebc/src/vm/exceptionhandling.cpp
• https://github.com/aspnet/Hosting/issues/1329

Mongod

• https://docs.mongodb.com/manual/tutorial/manage-mongodb-processes/
• https://docs.mongodb.com/manual/tutorial/install-mongodb-on-windows/#configure-a-windows-service-for-mongodb-community-edition
• https://stackoverflow.com/questions/7973113/how-to-stop-mongodb-server-on-windows
• C#
  • https://stackoverflow.com/questions/6312936/howto-gracefully-shutdown-mongod-in-roleentrypoint-onstop-method
  • https://stackoverflow.com/questions/29979713/mongoserver-does-not-contain-a-definition-for-create
  • https://www.mongodb.com/blog/post/introducing-20-net-driver

Linux Kill

$ kill -l
 1) SIGHUP       2) SIGINT       3) SIGQUIT      4) SIGILL       5) SIGTRAP
 6) SIGABRT      7) SIGBUS       8) SIGFPE       9) SIGKILL     10) SIGUSR1
11) SIGSEGV     12) SIGUSR2     13) SIGPIPE     14) SIGALRM     15) SIGTERM
16) SIGSTKFLT   17) SIGCHLD     18) SIGCONT     19) SIGSTOP     20) SIGTSTP
21) SIGTTIN     22) SIGTTOU     23) SIGURG      24) SIGXCPU     25) SIGXFSZ
26) SIGVTALRM   27) SIGPROF     28) SIGWINCH    29) SIGIO       30) SIGPWR
31) SIGSYS      34) SIGRTMIN    35) SIGRTMIN+1  36) SIGRTMIN+2  37) SIGRTMIN+3
38) SIGRTMIN+4  39) SIGRTMIN+5  40) SIGRTMIN+6  41) SIGRTMIN+7  42) SIGRTMIN+8
43) SIGRTMIN+9  44) SIGRTMIN+10 45) SIGRTMIN+11 46) SIGRTMIN+12 47) SIGRTMIN+13
48) SIGRTMIN+14 49) SIGRTMIN+15 50) SIGRTMAX-14 51) SIGRTMAX-13 52) SIGRTMAX-12
53) SIGRTMAX-11 54) SIGRTMAX-10 55) SIGRTMAX-9  56) SIGRTMAX-8  57) SIGRTMAX-7
58) SIGRTMAX-6  59) SIGRTMAX-5  60) SIGRTMAX-4  61) SIGRTMAX-3  62) SIGRTMAX-2
63) SIGRTMAX-1  64) SIGRTMAX

• SIGINT = 2
• SIGQUIT = 3
• SIGKILL = 9
• SIGTERM = 15

See https://askubuntu.com/questions/14155/what-to-do-when-ctrl-c-wont-kill-running-job

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• kill vs pkill...