How is the swoole coroutine scheduled?

Swoole coroutine is a lightweight concurrency library that allows developers to write concurrent programs. The Swoole coroutine scheduling mechanism is based on the coroutine mode and event loop, using the coroutine stack to manage coroutine execution, and suspend them after the coroutine gives up control. The event loop handles IO and timer events. When the coroutine gives up control, it is suspended and returns to the event loop. When an event occurs, Swoole switches from the event loop to the pending coroutine, completing the switch by saving and loading the coroutine state. Coroutine scheduling uses a priority mechanism and supports suspend, sleep, and resume operations to flexibly control coroutine execution.

Swoole coroutine scheduling mechanism

What is Swoole coroutine?

Swoole coroutine is a lightweight coroutine library that allows developers to write concurrent programs without the need to create and manage threads. Coroutines share the memory and resources of a process, thereby improving performance and efficiency.

Swoole coroutine scheduling mechanism

Swoole coroutine implements scheduling based on coroutine mode and event loop. It uses a coroutine stack to manage the execution of coroutines and suspends them after they relinquish control.

Event Loop

Swoole uses an event loop to handle IO and timer events. When a coroutine relinquishes control (for example, waiting for a network response), Swoole suspends it and returns to the event loop. The event loop listens for events and calls the appropriate callback functions to handle them.

Coroutine switching

When an event occurs, Swoole can switch from the event loop to the suspended coroutine. It performs coroutine switching through the following steps:

1. Saves the state of the current coroutine, including registers, stack pointer and program counter.
2. Load the status of the pending coroutine.
3. Resume the execution of the coroutine.

Scheduling of coroutines

Swoole uses coroutine priority to schedule coroutines. Coroutines with higher priority will be executed before coroutines with lower priority. At the same time, Swoole also supports operations such as coroutine suspension, hibernation, and recovery, allowing developers to flexibly control the execution of coroutines.

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