Process Management

class Process:
    """
    A process object represents activity that is run in a separate process.
    
    Args:
        target: callable object to be invoked by the run() method
        name: name of the process (defaults to Process-N)
        args: argument tuple for the target invocation
        kwargs: dictionary of keyword arguments for the target invocation
        daemon: boolean flag indicating if process is daemonic
    """
    def __init__(self, target=None, name=None, args=(), kwargs={}, daemon=None): ...
    
    def start(self):
        """Start the process's activity."""
    
    def run(self):
        """Method representing the process's activity."""
    
    def terminate(self):
        """Terminate the process using SIGTERM."""
    
    def kill(self):
        """Terminate the process using SIGKILL (Unix) or TerminateProcess (Windows)."""
    
    def join(self, timeout=None):
        """
        Wait until the process terminates.
        
        Args:
            timeout: optional timeout in seconds
        """
    
    def is_alive(self):
        """
        Return whether the process is alive.
        
        Returns:
            bool: True if process is running, False otherwise
        """
    
    def close(self):
        """Close the Process object and release associated resources."""
    
    # Properties
    name: str  # Process name
    daemon: bool  # Daemon flag
    pid: int  # Process ID (None if not started)
    exitcode: int  # Exit code (None if not terminated)
    authkey: bytes  # Authentication key
    sentinel: object  # Object that becomes ready when process terminates

def current_process():
    """
    Return the Process object corresponding to the current process.
    
    Returns:
        Process: The current process object
    """

def parent_process():
    """
    Return the Process object corresponding to the parent process.
    
    Returns:
        Process: The parent process object, or None if no parent
    """

def active_children():
    """
    Return a list of all live child processes.
    
    Returns:
        list[Process]: List of active child Process objects
    """

def cpu_count():
    """
    Return the number of CPUs in the system.
    
    Returns:
        int: Number of CPUs available
        
    Raises:
        NotImplementedError: If CPU count cannot be determined
    """

def freeze_support():
    """
    Add support for when a program which uses multiprocess has been
    frozen to produce a Windows executable.
    
    This should be called on the main thread at the start of the
    main module for frozen Windows executables.
    """

from multiprocess import Process

def worker_function(name, number):
    print(f"Worker {name}: Processing {number}")
    return number * 2

# Create and start a process
p = Process(target=worker_function, args=('Worker1', 42))
p.start()
p.join()  # Wait for completion
print(f"Process completed with exit code: {p.exitcode}")

from multiprocess import Process

class WorkerProcess(Process):
    def __init__(self, data):
        super().__init__()
        self.data = data
    
    def run(self):
        print(f"Processing data: {self.data}")
        # Do work here
        print("Work completed")

# Create and start custom process
worker = WorkerProcess("important data")
worker.start()
worker.join()

from multiprocess import Process, active_children
import time

def long_running_task(task_id):
    print(f"Task {task_id} starting")
    time.sleep(2)
    print(f"Task {task_id} completed")

# Create multiple processes
processes = []
for i in range(3):
    p = Process(target=long_running_task, args=(i,))
    p.start()
    processes.append(p)

# Monitor active processes
print(f"Active children: {len(active_children())}")

# Wait for all to complete
for p in processes:
    p.join()

print("All processes completed")

from multiprocess import Process, current_process
import os

def show_process_info():
    current = current_process()
    print(f"Process name: {current.name}")
    print(f"Process PID: {current.pid}")
    print(f"OS PID: {os.getpid()}")

# Create process
p = Process(target=show_process_info, name='InfoWorker')
print(f"Before start - PID: {p.pid}, Alive: {p.is_alive()}")

p.start()
print(f"After start - PID: {p.pid}, Alive: {p.is_alive()}")

p.join()
print(f"After join - Exit code: {p.exitcode}, Alive: {p.is_alive()}")

from multiprocess import Process
import time

def daemon_worker():
    while True:
        print("Daemon working...")
        time.sleep(1)

def regular_worker():
    time.sleep(3)
    print("Regular worker done")

# Create daemon process
daemon = Process(target=daemon_worker, daemon=True)
daemon.start()

# Create regular process
regular = Process(target=regular_worker)
regular.start()
regular.join()

print("Main process ending - daemon will be terminated")
# Daemon process terminates when main process exits