On POSIX-compliant platforms, SIGUSR1 and SIGUSR2 are signals sent to a process to indicate user-defined conditions. The symbolic constants for them are defined in the header file signal.h. Symbolic signal names are used because signal numbers can vary across platforms. Etymology. SIG is a common prefix for signal names.
You can start multiple workers on the same machine, but be sure to name each individual worker by specifying a node name with the --hostname argument: $ celery -A proj worker --loglevel = INFO --concurrency = 10-n worker1@%h $ celery -A proj worker --loglevel = INFO --concurrency = 10-n worker2@%h $ celery -A proj worker --loglevel = INFO --concurrency = 10-n worker3@%h Fri Nov 25 21:45:37 2016 SIGUSR1[soft,connection-reset] received, process restarting Fri Nov 25 21:45:37 2016 MANAGEMENT: >STATE:1480128337,RECONNECTING,connection-reset,, Fri Nov 25 21:45:37 2016 Restart pause, 5 second(s) Feb 21, 2017 · This example would allow Perl operations like backticks, system, fork, and waitpid to be executed in the compartment. Of course, you probably don't want to use this mask -- it would allow exactly what the Safe compartment is designed to prevent. Because of this capability, kill() can also be considered as a communication mechanism among processes with signals SIGUSR1 and SIGUSR2. The pid argument can also be zero or negative to indicate that the signal should be sent to a group of processes. But, for simplicity, we will not discuss this case. Example SIGUSR1: 10: User-defined signal 1: SIGSEGV: 11: Segmentation Violation (ANSI) Occurs when a program tries to read or write outside the memory that is allocated for it by the operating system, dereferencing a bad or NULL pointer. Indicates an invalid access to valid memory. SIGUSR2: 12: User-defined signal 2: SIGPIPE: 13: Broken pipe (POSIX) Feb 04, 2014 · You need to login to root user either using su or sudo command to sends the specified signal to the specified process or process group owned by root/system user. In this example, login to the system using su command: $ su - Password: # pgrep httpd 4243 # kill 4243. OR use sudo command if configured on your system to kill PID # 4243: On Solaris 8 and 9 OS, the -XX:+UseAltSigs option can be used to instruct the HotSpot VM to use alternative signals to SIGUSR1 and SIGUSR2. Starting with Solaris 10 OS, this option is ignored, as the operating system reserves two additional signals (called SIGJVM1 and SIGJVM2).
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For example, sending SIGQUIT terminates the program and generates a core dump; sending SIGINT is equivalent to hitting Ctrl-C; sending SIGTERM or SIGKILL kills the program. We use SIGUSR1 here because it illustrates a way of using user-defined signals.
Kill Example (The GNU C Library)
SUSV3: #define _UNIX03_THREADS #include