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| author | Evgeniy Polyakov <zbr@ioremap.net> | 2017-04-20 16:51:36 +0300 |
|---|---|---|
| committer | Alex Brainman <alex.brainman@gmail.com> | 2017-04-25 04:30:06 +0000 |
| commit | 9f98e49825e38267dc5e91b827cb1db3291ff3bb (patch) | |
| tree | e87b8929e6c25693bf5fe0bb6cbdd08b2cfb0e6d /src/runtime/sys_windows_amd64.s | |
| parent | b0472e225bddf7c7ba2b61f10339106719f25b7f (diff) | |
| download | go-9f98e49825e38267dc5e91b827cb1db3291ff3bb.tar.xz | |
runtime: make time correctly update on Wine
Implemented low-level time system for windows on hardware (software),
which does not support memory mapped _KSYSTEM_TIME page update.
In particular this problem exists on Wine where _KSYSTEM_TIME
only contains time at the start, and is never modified.
On start we try to detect Wine and if it's so we fallback to
GetSystemTimeAsFileTime() for current time and a monotonic
timer based on QueryPerformanceCounter family of syscalls:
https://msdn.microsoft.com/en-us/library/windows/desktop/dn553408(v=vs.85).aspx
Fixes #18537
Change-Id: I269d22467ed9b0afb62056974d23e731b80c83ed
Reviewed-on: https://go-review.googlesource.com/35710
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Diffstat (limited to 'src/runtime/sys_windows_amd64.s')
| -rw-r--r-- | src/runtime/sys_windows_amd64.s | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/runtime/sys_windows_amd64.s b/src/runtime/sys_windows_amd64.s index 898aadfcf4..744e78c708 100644 --- a/src/runtime/sys_windows_amd64.s +++ b/src/runtime/sys_windows_amd64.s @@ -474,6 +474,8 @@ TEXT runtime·switchtothread(SB),NOSPLIT|NOFRAME,$0 #define time_hi2 8 TEXT runtime·nanotime(SB),NOSPLIT,$0-8 + CMPB runtime·useQPCTime(SB), $0 + JNE useQPC MOVQ $_INTERRUPT_TIME, DI loop: MOVL time_hi1(DI), AX @@ -487,8 +489,13 @@ loop: SUBQ runtime·startNano(SB), CX MOVQ CX, ret+0(FP) RET +useQPC: + JMP runtime·nanotimeQPC(SB) + RET TEXT time·now(SB),NOSPLIT,$0-24 + CMPB runtime·useQPCTime(SB), $0 + JNE useQPC MOVQ $_INTERRUPT_TIME, DI loop: MOVL time_hi1(DI), AX @@ -529,3 +536,6 @@ wall: SUBQ DX, CX MOVL CX, nsec+8(FP) RET +useQPC: + JMP runtime·nowQPC(SB) + RET |