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Revert "sync: yield to the waiter when unlocking a starving mutex"

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This reverts CL 200577.

Reason for revert: broke linux-arm64-packet and solaris-amd64-oraclerel builders

Fixes #35424
Updates #33747

Change-Id: I2575fd84d37995d458183caae54704f15d8b8426
Reviewed-on: https://go-review.googlesource.com/c/go/+/205817
Run-TryBot: Bryan C. Mills <bcmills@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Bryan C. Mills 2019-11-07 14:09:23 +00:00
parent e8f01d591f
commit 73d57bf80f
5 changed files with 2 additions and 125 deletions
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15
src/runtime/proc.go
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@ -2753,22 +2753,7 @@ func preemptPark(gp *g) {
casGToPreemptScan(gp, _Grunning, _Gscan|_Gpreempted)
dropg()
casfrom_Gscanstatus(gp, _Gscan|_Gpreempted, _Gpreempted)
schedule()
}
// goyield is like Gosched, but it:
// - does not emit a GoSched trace event
// - puts the current G on the runq of the current P instead of the globrunq
func goyield() {
checkTimeouts()
mcall(goyield_m)
}
func goyield_m(gp *g) {
pp := gp.m.p.ptr()
casgstatus(gp, _Grunning, _Grunnable)
dropg()
runqput(pp, gp, false)
schedule()
}