spawn

问题 I have the following python code (script.py): import sys import numpy as np from scipy import stats def generateBeta() : fit = (0.075252656968743836, 498.49505071718869, 9.9999999999999991e-05, 0.18136881492296397) rnd = stats.beta.rvs(fit[0], fit[1], fit[2], fit[3], 581) rndStr = "" for i in rnd: rndStr += str(i) + ',' print rndStr[0:len(rndStr)-1] if __name__ =='__main__' : generateBeta() When running "python script.py" I get something like: 0.000461650100253,0.000100731728317,0

问题 In this convoluted example, two for loops are started by boost::asio::spawn() asynchronously. The first for loop prints an odd number every 1000us and the second one prints an even number every 1000us. I expect the output to be something like 1 2 3 4 5 6 and then the 'Throw an error' message should be printed to stderr by the call to cerr. However, the exception is actually thrown in loop.run() so it is not caught by the try catch block. Can someone point out how to properly catch the runtime

问题 I am new to rust and tokio async, and I am trying to compile the following seemingly straightforward code: async fn network_handler(network_config: &config::NetworkConfig) -> Result<(), Error> { Ok(()) } pub async fn run(network_config: &config::NetworkConfig) -> Result<(), Error> { let network_config_copy = network_config.clone(); tokio::spawn(async move { network_handler(&network_config_copy).await }).await? } But the compiler complains: error: cannot infer an appropriate lifetime --> src

问题 I am new to rust and tokio async, and I am trying to compile the following seemingly straightforward code: async fn network_handler(network_config: &config::NetworkConfig) -> Result<(), Error> { Ok(()) } pub async fn run(network_config: &config::NetworkConfig) -> Result<(), Error> { let network_config_copy = network_config.clone(); tokio::spawn(async move { network_handler(&network_config_copy).await }).await? } But the compiler complains: error: cannot infer an appropriate lifetime --> src

来源： https://stackoverflow.com/questions/32598607/not-receiving-stdout-from-nodejs-spawned-process

来源： https://stackoverflow.com/questions/32598607/not-receiving-stdout-from-nodejs-spawned-process

来源： https://stackoverflow.com/questions/32598607/not-receiving-stdout-from-nodejs-spawned-process

问题 In an online training video I am watching to learn Node, the narrator says that "spawn is better for longer processes involving large amounts of data, whereas execute is better for short bits of data." Why is this? What is the difference between the child_process spawn and execute functions in Node.js, and when do I know which one to use? 回答1: The main difference is the spawn is more suitable for long-running process with huge output. spawn streams input/output with child process. exec

问题 When I run my program. The code I put into "override func sceneDidLoad()" runs two times. E.g. Note: I have no idea why this picture is not uploading, but it shows "spawn" happening twice. This code should only run once when "sceneDidLoad()" is called. Here is the code for the "sceneDidLoad" function, and for the "testSpawn()" function (which is the specific one that gave the duplicated printout). class GameScene: SKScene { var mapTerrain: SKTileMapNode! override func sceneDidLoad() { cam =

问题 I am attempting to stream output from a weighing scale that is written in python. This program (scale.py) runs continuously and prints the raw value every half second. import RPi.GPIO as GPIO import time import sys from hx711 import HX711 def cleanAndExit(): print "Cleaning..." GPIO.cleanup() print "Bye!" sys.exit() hx = HX711(5, 6) hx.set_reading_format("LSB", "MSB") hx.reset() hx.tare() while True: try: val = hx.get_weight(5) print val hx.power_down() hx.power_up() time.sleep(0.5) except