Rohan Verma rhnvrm

Understanding Go RWMutex Nested RLock Limitations

TL;DR

Go's sync.RWMutex can deadlock when the same goroutine tries to acquire RLock() multiple times while a writer is waiting. This is by design due to Go's writer-preferring behavior that prevents writer starvation.

Key insight: RWMutex has a dual personality - readers can delay writers indefinitely until a writer starts waiting, then no new readers are allowed.

The Official Rule

From the official Go documentation:

	// Go 1.23 Iterator Patterns: Complete Performance Guide
	//
	// This comprehensive benchmark compares 5 different iteration patterns in Go:
	// 1. Go 1.23 Range-over-Function Iterators (NEW) ⭐
	// 2. Copy-Everything Pattern (TRADITIONAL)
	// 3. Callback Pattern (PRE-ITERATOR)
	// 4. Channel Pattern (GOROUTINE-BASED)
	// 5. Manual Iterator Struct (EXPLICIT STATE)
	//
	// 🏆 KEY FINDINGS:

	#!/usr/bin/env bash

	# instq.sh
	# Utility for querying and manipulating Zerodha instruments file

	# Usage
	# -----
	#
	# Requirements:
	# 1. Install jq

	import tweepy
	import os
	import logging
	import re

	def create_api():
	consumer_key = os.getenv("CONSUMER_KEY")
	consumer_secret = os.getenv("CONSUMER_SECRET")
	access_token = os.getenv("ACCESS_TOKEN")
	access_token_secret = os.getenv("ACCESS_SECRET")

	package main

	import (
	"encoding/json"
	"strings"
	"testing"

	"github.com/stretchr/testify/require"
	)

	live_loop :beat do
	sample :bd_haus, rate: 1
	sleep 0.25
	sync :melody
	end

	notes = []
	delays = []

	notes = [:G4, :G4, :D5, :C5, :As4, :A4, :A4, :C5, :As4, :A4]

	package main

	import (
	"fmt"
	"testing"

	"github.com/Knetic/govaluate"
	"github.com/google/cel-go/cel"
	"github.com/google/cel-go/checker/decls"
	"github.com/google/cel-go/common/types"