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| author | Rhys Hiltner <rhys.hiltner@gmail.com> | 2024-10-28 14:01:54 -0700 |
|---|---|---|
| committer | Michael Knyszek <mknyszek@google.com> | 2024-11-15 21:15:59 +0000 |
| commit | 18c2461af38e93ed385e953f3336fcaaca2da727 (patch) | |
| tree | ca2437f778f0d63947692e38936c3708b416ec8b /src/runtime/runtime2.go | |
| parent | 252e9def65cd6230447fc11046d7f4b176ae2d4b (diff) | |
| download | go-18c2461af38e93ed385e953f3336fcaaca2da727.tar.xz | |
runtime: allow futex OSes to use sema-based mutex
Implement sema{create,sleep,wakeup} in terms of the futex syscall when
available. Split the lock2/unlock2 implementations out of lock_sema.go
and lock_futex.go (which they shared with runtime.note) to allow
swapping in new implementations of those.
Let futex-based platforms use the semaphore-based mutex implementation.
Control that via the new "spinbitmutex" GOEXPERMENT value, disabled by
default.
This lays the groundwork for a "spinbit" mutex implementation; it does
not include the new mutex implementation.
For #68578.
Change-Id: I091289c85124212a87abec7079ecbd9e610b4270
Reviewed-on: https://go-review.googlesource.com/c/go/+/622996
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Diffstat (limited to 'src/runtime/runtime2.go')
| -rw-r--r-- | src/runtime/runtime2.go | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/runtime/runtime2.go b/src/runtime/runtime2.go index 2d668637b1..b8c710a816 100644 --- a/src/runtime/runtime2.go +++ b/src/runtime/runtime2.go @@ -571,7 +571,7 @@ type m struct { createstack [32]uintptr // stack that created this thread, it's used for StackRecord.Stack0, so it must align with it. lockedExt uint32 // tracking for external LockOSThread lockedInt uint32 // tracking for internal lockOSThread - nextwaitm muintptr // next m waiting for lock + mWaitList mWaitList // list of runtime lock waiters mLockProfile mLockProfile // fields relating to runtime.lock contention profStack []uintptr // used for memory/block/mutex stack traces |