Skip to content

FAQ.md

Latest commit

 

History

History
206 lines (152 loc) · 3.74 KB

FAQ.md

File metadata and controls

206 lines (152 loc) · 3.74 KB
doc_id THR-GUID-020
doc_title Thread System - Frequently Asked Questions
doc_version 1.0.0
doc_date 2026-04-04
doc_status Released
project thread_system
category GUID

Thread System - Frequently Asked Questions

SSOT: This document is the single source of truth for Thread System - Frequently Asked Questions.

Version: 0.1.0 Last Updated: 2025-11-11 Audience: Users, Developers

This FAQ addresses common questions about the thread_system, covering thread pools, job scheduling, synchronization, and performance.

Table of Contents

  1. General Questions
  1. Thread Pool Basics
  2. Job Scheduling
  3. Synchronization
  4. Performance
  5. Integration

General Questions

1. What is the thread_system?

A high-performance thread pool and job scheduling system for C++20:

  • Thread pools with configurable size
  • Job scheduling with priorities
  • Work stealing for load balancing
  • Future/Promise support
  • Thread-safe by default
#include <thread/thread_pool.hpp>

auto pool = thread_pool::create(4);  // 4 worker threads
auto future = pool->submit([]() {
    return compute_result();
});
auto result = future.get();

2. How do I create a thread pool?

// Fixed size pool
auto pool = thread_pool::create(4);

// Auto-sized (hardware_concurrency)
auto pool = thread_pool::create();

// With configuration
auto pool = thread_pool::create({
    .thread_count = 8,
    .queue_size = 1000,
    .enable_work_stealing = true
});

3. How do I submit jobs?

// Fire-and-forget
pool->submit([]() {
    do_work();
});

// With return value
auto future = pool->submit([]() {
    return 42;
});
int result = future.get();

// With parameters
pool->submit([](int x, int y) {
    return x + y;
}, 10, 20);

4. How do I handle priorities?

// High priority job
pool->submit([]() {
    critical_work();
}, priority::high);

// Normal priority (default)
pool->submit([]() {
    normal_work();
});

// Low priority
pool->submit([]() {
    background_work();
}, priority::low);

5. What is the performance?

Benchmarks (4-core CPU):

  • Job submission: <100 ns
  • Context switch: ~1 μs
  • Throughput: 1M jobs/s

6. Is it thread-safe?

Yes, all operations are thread-safe.

// Multiple threads can submit concurrently
std::vector<std::thread> threads;
for (int i = 0; i < 10; ++i) {
    threads.emplace_back([&pool]() {
        pool->submit([]() { /* work */ });
    });
}

7. How do I wait for completion?

// Wait for specific job
auto future = pool->submit([]() { return 42; });
int result = future.wait();

// Wait for all jobs
pool->wait_for_all();

// Wait with timeout
if (pool->wait_for(std::chrono::seconds(5))) {
    // Completed
} else {
    // Timeout
}

8. How do I shutdown a pool?

// Graceful shutdown (finish pending jobs)
pool->shutdown();
pool->wait_for_all();

// Immediate shutdown
pool->shutdown_now();

9. Can I integrate with monitoring_system?

// Automatic metrics
auto pool = thread_pool::create(4, {
    .enable_monitoring = true
});

// Metrics available:
// - thread_pool_active_threads
// - thread_pool_queued_tasks
// - thread_pool_completed_tasks

10. Where can I find more information?

Documentation:

Support:

Last Updated: 2025-11-11