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| author | Ian Lance Taylor <ian@gcc.gnu.org> | 2018-02-20 15:30:31 +0000 |
|---|---|---|
| committer | Ian Lance Taylor <ian@gcc.gnu.org> | 2018-02-20 15:30:31 +0000 |
| commit | 911cef2e3ba7548ee13e761f88457c6bbe1fa7fe (patch) | |
| tree | 140f7eca6d15defccbef94b9bfa5d41e30168520 /libgo/go/runtime/proc.go | |
| parent | 9bd958c5f361337b15958be8641d59ad38bd0a2b (diff) | |
| download | gcc-911cef2e3ba7548ee13e761f88457c6bbe1fa7fe.zip gcc-911cef2e3ba7548ee13e761f88457c6bbe1fa7fe.tar.gz gcc-911cef2e3ba7548ee13e761f88457c6bbe1fa7fe.tar.bz2 | |
runtime: allow preemption in fast syscall return
Let a fast syscall return be a preemption point. This helps with
tight loops that make system calls, as in BenchmarkSyscallExcessWork.
Reviewed-on: https://go-review.googlesource.com/94895
From-SVN: r257848
Diffstat (limited to 'libgo/go/runtime/proc.go')
| -rw-r--r-- | libgo/go/runtime/proc.go | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/libgo/go/runtime/proc.go b/libgo/go/runtime/proc.go index 1d95109..20fa0ad 100644 --- a/libgo/go/runtime/proc.go +++ b/libgo/go/runtime/proc.go @@ -2794,6 +2794,13 @@ func exitsyscall(dummy int32) { exitsyscallclear(_g_) _g_.m.locks-- _g_.throwsplit = false + + // Check preemption, since unlike gc we don't check on + // every call. + if getg().preempt { + checkPreempt() + } + return } |