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Tools for concurrent programming.

§Atomics

• AtomicCell, a thread-safe mutable memory location.
• AtomicConsume, for reading from primitive atomic types with “consume” ordering.

§Data structures

• deque, work-stealing deques for building task schedulers.
• ArrayQueue, a bounded MPMC queue that allocates a fixed-capacity buffer on construction.
• SegQueue, an unbounded MPMC queue that allocates small buffers, segments, on demand.

§Memory management

• epoch, an epoch-based garbage collector.

§Thread synchronization

• channel, multi-producer multi-consumer channels for message passing.
• Parker, a thread parking primitive.
• ShardedLock, a sharded reader-writer lock with fast concurrent reads.
• WaitGroup, for synchronizing the beginning or end of some computation.

§Utilities

• Backoff, for exponential backoff in spin loops.
• CachePadded, for padding and aligning a value to the length of a cache line.
• scope, for spawning threads that borrow local variables from the stack.