Concurrency & Async

Core: start here

• async / awaitSyntax for writing asynchronous code that reads like synchronous code.
• Promise / FutureAn object representing a value that will be available later.

Core: start here

• Concurrency vs ParallelismDealing with many things at once vs doing many things at once.
• Event LoopA single thread running tasks from a queue, as in JavaScript and asyncio.
• Race ConditionA bug where the result depends on unpredictable timing.

• Actor ModelConcurrency through isolated actors that communicate by messages.
• BackpressureA slow consumer signalling a fast producer to slow down.
• ChannelA typed pipe for passing values between concurrent tasks.
• Green Threads / GoroutinesLightweight threads scheduled by the runtime rather than the OS.
• LivelockTasks keep reacting to each other without making progress.
• SemaphoreA counter limiting how many tasks can use a resource at once.
• StarvationA task never gets the resources it needs to run.

Nothing here yet.

• Lock-Free Data StructuresConcurrent structures built from atomic operations instead of locks.
• Memory ModelThe rules for when writes by one thread become visible to others.

• async / awaitSyntax for writing asynchronous code that reads like synchronous code.
• CallbackA function passed in to be called when work finishes.
• Callback HellDeeply nested callbacks that make async code unreadable.
• Promise / FutureAn object representing a value that will be available later.

• Atomic OperationAn operation that completes entirely or not at all, with no interleaving.
• Blocking vs Non-blocking I/OWhether waiting for I/O stops the thread.
• CancellationStopping in-flight async work cleanly, e.g. with AbortController or a context.
• Check-Then-Act Race (TOCTOU)Checking a condition and acting on it as two steps, so something changes in between.
• Concurrency vs ParallelismDealing with many things at once vs doing many things at once.
• CoroutineA function that can pause and resume; the basis of async/await.
• Critical SectionCode that must not run concurrently with itself.
• DeadlockTwo or more tasks waiting on each other forever.
• Event LoopA single thread running tasks from a queue, as in JavaScript and asyncio.
• Global Interpreter Lock (GIL)Python's lock that lets only one thread run bytecode at a time.
• Mutex / LockEnsuring only one thread enters a critical section at a time.
• ProcessA running program with its own memory space.
• Race ConditionA bug where the result depends on unpredictable timing.
• ThreadAn execution path within a process that shares its memory.
• Thread PoolA fixed set of reusable worker threads.
• Thread SafetyCode that behaves correctly when called from many threads.

• Actor ModelConcurrency through isolated actors that communicate by messages.
• BackpressureA slow consumer signalling a fast producer to slow down.
• ChannelA typed pipe for passing values between concurrent tasks.
• Green Threads / GoroutinesLightweight threads scheduled by the runtime rather than the OS.
• LivelockTasks keep reacting to each other without making progress.
• SemaphoreA counter limiting how many tasks can use a resource at once.
• StarvationA task never gets the resources it needs to run.

Nothing here yet.

• Lock-Free Data StructuresConcurrent structures built from atomic operations instead of locks.
• Memory ModelThe rules for when writes by one thread become visible to others.

Core: start here

• async / awaitSyntax for writing asynchronous code that reads like synchronous code.
• Promise / FutureAn object representing a value that will be available later.

Core: start here

• Event LoopA single thread running tasks from a queue, as in JavaScript and asyncio.
• Race ConditionA bug where the result depends on unpredictable timing.

• BackpressureA slow consumer signalling a fast producer to slow down.
• DeadlockTwo or more tasks waiting on each other forever.
• ProcessA running program with its own memory space.
• ThreadAn execution path within a process that shares its memory.

Nothing here yet.

Nothing here yet.