I have some question about channel and mutex operation

UK

unread,

Nov 25, 2022, 11:36:00 AM11/25/22

to golang-nuts

channel and mutex eventually call futexsleep(in runtime source) when need to block

but when I tested sync.Mutex lock 10000 times, there is only 8 threads..

futex is os level operation(syscall), then futex sleep os-level thread(not goroutine)

right? somebody help me understand...

Ian Lance Taylor

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Nov 25, 2022, 12:07:43 PM11/25/22

to UK, golang-nuts

It's not accurate to say that channel and mutex operations always call
futexsleep. Those operations will park the goroutine until it is
ready and the thread will enter the scheduler to find another
goroutine to run. futexsleep is used by a thread when there is no
goroutine available to schedule.

Ian

UK

unread,

Nov 27, 2022, 7:50:19 PM11/27/22

to Ian Lance Taylor, golang-nuts

Thank you for the clarification. i will check again source code. Thank you!

2022년 11월 26일 (토) 오전 2:07, Ian Lance Taylor <ia...@golang.org>님이 작성:

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