// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package runtime
import (
"runtime/internal/atomic"
"unsafe"
)
// TODO(brainman): should not need those
const (
_NSIG = 65
)
//go:cgo_import_dynamic runtime._AddVectoredExceptionHandler AddVectoredExceptionHandler%2 "kernel32.dll"
//go:cgo_import_dynamic runtime._CloseHandle CloseHandle%1 "kernel32.dll"
//go:cgo_import_dynamic runtime._CreateEventA CreateEventA%4 "kernel32.dll"
//go:cgo_import_dynamic runtime._CreateIoCompletionPort CreateIoCompletionPort%4 "kernel32.dll"
//go:cgo_import_dynamic runtime._CreateThread CreateThread%6 "kernel32.dll"
//go:cgo_import_dynamic runtime._CreateWaitableTimerA CreateWaitableTimerA%3 "kernel32.dll"
//go:cgo_import_dynamic runtime._DuplicateHandle DuplicateHandle%7 "kernel32.dll"
//go:cgo_import_dynamic runtime._ExitProcess ExitProcess%1 "kernel32.dll"
//go:cgo_import_dynamic runtime._FreeEnvironmentStringsW FreeEnvironmentStringsW%1 "kernel32.dll"
//go:cgo_import_dynamic runtime._GetConsoleMode GetConsoleMode%2 "kernel32.dll"
//go:cgo_import_dynamic runtime._GetEnvironmentStringsW GetEnvironmentStringsW%0 "kernel32.dll"
//go:cgo_import_dynamic runtime._GetProcAddress GetProcAddress%2 "kernel32.dll"
//go:cgo_import_dynamic runtime._GetProcessAffinityMask GetProcessAffinityMask%3 "kernel32.dll"
//go:cgo_import_dynamic runtime._GetQueuedCompletionStatus GetQueuedCompletionStatus%5 "kernel32.dll"
//go:cgo_import_dynamic runtime._GetStdHandle GetStdHandle%1 "kernel32.dll"
//go:cgo_import_dynamic runtime._GetSystemDirectoryA GetSystemDirectoryA%2 "kernel32.dll"
//go:cgo_import_dynamic runtime._GetSystemInfo GetSystemInfo%1 "kernel32.dll"
//go:cgo_import_dynamic runtime._GetThreadContext GetThreadContext%2 "kernel32.dll"
//go:cgo_import_dynamic runtime._LoadLibraryW LoadLibraryW%1 "kernel32.dll"
//go:cgo_import_dynamic runtime._LoadLibraryA LoadLibraryA%1 "kernel32.dll"
//go:cgo_import_dynamic runtime._ResumeThread ResumeThread%1 "kernel32.dll"
//go:cgo_import_dynamic runtime._SetConsoleCtrlHandler SetConsoleCtrlHandler%2 "kernel32.dll"
//go:cgo_import_dynamic runtime._SetErrorMode SetErrorMode%1 "kernel32.dll"
//go:cgo_import_dynamic runtime._SetEvent SetEvent%1 "kernel32.dll"
//go:cgo_import_dynamic runtime._SetProcessPriorityBoost SetProcessPriorityBoost%2 "kernel32.dll"
//go:cgo_import_dynamic runtime._SetThreadPriority SetThreadPriority%2 "kernel32.dll"
//go:cgo_import_dynamic runtime._SetUnhandledExceptionFilter SetUnhandledExceptionFilter%1 "kernel32.dll"
//go:cgo_import_dynamic runtime._SetWaitableTimer SetWaitableTimer%6 "kernel32.dll"
//go:cgo_import_dynamic runtime._SuspendThread SuspendThread%1 "kernel32.dll"
//go:cgo_import_dynamic runtime._SwitchToThread SwitchToThread%0 "kernel32.dll"
//go:cgo_import_dynamic runtime._TlsAlloc TlsAlloc%0 "kernel32.dll"
//go:cgo_import_dynamic runtime._VirtualAlloc VirtualAlloc%4 "kernel32.dll"
//go:cgo_import_dynamic runtime._VirtualFree VirtualFree%3 "kernel32.dll"
//go:cgo_import_dynamic runtime._VirtualQuery VirtualQuery%3 "kernel32.dll"
//go:cgo_import_dynamic runtime._WaitForSingleObject WaitForSingleObject%2 "kernel32.dll"
//go:cgo_import_dynamic runtime._WaitForMultipleObjects WaitForMultipleObjects%4 "kernel32.dll"
//go:cgo_import_dynamic runtime._WriteConsoleW WriteConsoleW%5 "kernel32.dll"
//go:cgo_import_dynamic runtime._WriteFile WriteFile%5 "kernel32.dll"
type stdFunction unsafe.Pointer
var (
// Following syscalls are available on every Windows PC.
// All these variables are set by the Windows executable
// loader before the Go program starts.
_AddVectoredExceptionHandler,
_CloseHandle,
_CreateEventA,
_CreateIoCompletionPort,
_CreateThread,
_CreateWaitableTimerA,
_DuplicateHandle,
_ExitProcess,
_FreeEnvironmentStringsW,
_GetConsoleMode,
_GetEnvironmentStringsW,
_GetProcAddress,
_GetProcessAffinityMask,
_GetQueuedCompletionStatus,
_GetStdHandle,
_GetSystemDirectoryA,
_GetSystemInfo,
_GetSystemTimeAsFileTime,
_GetThreadContext,
_LoadLibraryW,
_LoadLibraryA,
_QueryPerformanceCounter,
_QueryPerformanceFrequency,
_ResumeThread,
_SetConsoleCtrlHandler,
_SetErrorMode,
_SetEvent,
_SetProcessPriorityBoost,
_SetThreadPriority,
_SetUnhandledExceptionFilter,
_SetWaitableTimer,
_SuspendThread,
_SwitchToThread,
_TlsAlloc,
_VirtualAlloc,
_VirtualFree,
_VirtualQuery,
_WaitForSingleObject,
_WaitForMultipleObjects,
_WriteConsoleW,
_WriteFile,
_ stdFunction
// Following syscalls are only available on some Windows PCs.
// We will load syscalls, if available, before using them.
_AddDllDirectory,
_AddVectoredContinueHandler,
_GetQueuedCompletionStatusEx,
_LoadLibraryExA,
_LoadLibraryExW,
_ stdFunction
// Use RtlGenRandom to generate cryptographically random data.
// This approach has been recommended by Microsoft (see issue
// 15589 for details).
// The RtlGenRandom is not listed in advapi32.dll, instead
// RtlGenRandom function can be found by searching for SystemFunction036.
// Also some versions of Mingw cannot link to SystemFunction036
// when building executable as Cgo. So load SystemFunction036
// manually during runtime startup.
_RtlGenRandom stdFunction
// Load ntdll.dll manually during startup, otherwise Mingw
// links wrong printf function to cgo executable (see issue
// 12030 for details).
_NtWaitForSingleObject stdFunction
// These are from non-kernel32.dll, so we prefer to LoadLibraryEx them.
_timeBeginPeriod,
_timeEndPeriod,
_WSAGetOverlappedResult,
_ stdFunction
)
// Function to be called by windows CreateThread
// to start new os thread.
func tstart_stdcall(newm *m)
// Called by OS using stdcall ABI.
func ctrlhandler()
type mOS struct {
waitsema uintptr // semaphore for parking on locks
resumesema uintptr // semaphore to indicate suspend/resume
}
//go:linkname os_sigpipe os.sigpipe
func os_sigpipe() {
throw("too many writes on closed pipe")
}
// Stubs so tests can link correctly. These should never be called.
func open(name *byte, mode, perm int32) int32 {
throw("unimplemented")
return -1
}
func closefd(fd int32) int32 {
throw("unimplemented")
return -1
}
func read(fd int32, p unsafe.Pointer, n int32) int32 {
throw("unimplemented")
return -1
}
type sigset struct{}
// Call a Windows function with stdcall conventions,
// and switch to os stack during the call.
func asmstdcall(fn unsafe.Pointer)
var asmstdcallAddr unsafe.Pointer
func windowsFindfunc(lib uintptr, name []byte) stdFunction {
if name[len(name)-1] != 0 {
throw("usage")
}
f := stdcall2(_GetProcAddress, lib, uintptr(unsafe.Pointer(&name[0])))
return stdFunction(unsafe.Pointer(f))
}
var sysDirectory [521]byte
var sysDirectoryLen uintptr
func windowsLoadSystemLib(name []byte) uintptr {
if useLoadLibraryEx {
return stdcall3(_LoadLibraryExA, uintptr(unsafe.Pointer(&name[0])), 0, _LOAD_LIBRARY_SEARCH_SYSTEM32)
} else {
if sysDirectoryLen == 0 {
l := stdcall2(_GetSystemDirectoryA, uintptr(unsafe.Pointer(&sysDirectory[0])), uintptr(len(sysDirectory)-1))
if l == 0 || l > uintptr(len(sysDirectory)-1) {
throw("Unable to determine system directory")
}
sysDirectory[l] = '\\'
sysDirectoryLen = l + 1
}
absName := append(sysDirectory[:sysDirectoryLen], name...)
return stdcall1(_LoadLibraryA, uintptr(unsafe.Pointer(&absName[0])))
}
}
func loadOptionalSyscalls() {
var kernel32dll = []byte("kernel32.dll\000")
k32 := stdcall1(_LoadLibraryA, uintptr(unsafe.Pointer(&kernel32dll[0])))
if k32 == 0 {
throw("kernel32.dll not found")
}
_AddDllDirectory = windowsFindfunc(k32, []byte("AddDllDirectory\000"))
_AddVectoredContinueHandler = windowsFindfunc(k32, []byte("AddVectoredContinueHandler\000"))
_GetQueuedCompletionStatusEx = windowsFindfunc(k32, []byte("GetQueuedCompletionStatusEx\000"))
_LoadLibraryExA = windowsFindfunc(k32, []byte("LoadLibraryExA\000"))
_LoadLibraryExW = windowsFindfunc(k32, []byte("LoadLibraryExW\000"))
useLoadLibraryEx = (_LoadLibraryExW != nil && _LoadLibraryExA != nil && _AddDllDirectory != nil)
var advapi32dll = []byte("advapi32.dll\000")
a32 := windowsLoadSystemLib(advapi32dll)
if a32 == 0 {
throw("advapi32.dll not found")
}
_RtlGenRandom = windowsFindfunc(a32, []byte("SystemFunction036\000"))
var ntdll = []byte("ntdll.dll\000")
n32 := windowsLoadSystemLib(ntdll)
if n32 == 0 {
throw("ntdll.dll not found")
}
_NtWaitForSingleObject = windowsFindfunc(n32, []byte("NtWaitForSingleObject\000"))
if GOARCH == "arm" {
_QueryPerformanceCounter = windowsFindfunc(k32, []byte("QueryPerformanceCounter\000"))
if _QueryPerformanceCounter == nil {
throw("could not find QPC syscalls")
}
}
var winmmdll = []byte("winmm.dll\000")
m32 := windowsLoadSystemLib(winmmdll)
if m32 == 0 {
throw("winmm.dll not found")
}
_timeBeginPeriod = windowsFindfunc(m32, []byte("timeBeginPeriod\000"))
_timeEndPeriod = windowsFindfunc(m32, []byte("timeEndPeriod\000"))
if _timeBeginPeriod == nil || _timeEndPeriod == nil {
throw("timeBegin/EndPeriod not found")
}
var ws232dll = []byte("ws2_32.dll\000")
ws232 := windowsLoadSystemLib(ws232dll)
if ws232 == 0 {
throw("ws2_32.dll not found")
}
_WSAGetOverlappedResult = windowsFindfunc(ws232, []byte("WSAGetOverlappedResult\000"))
if _WSAGetOverlappedResult == nil {
throw("WSAGetOverlappedResult not found")
}
if windowsFindfunc(n32, []byte("wine_get_version\000")) != nil {
// running on Wine
initWine(k32)
}
}
func monitorSuspendResume() {
const _DEVICE_NOTIFY_CALLBACK = 2
type _DEVICE_NOTIFY_SUBSCRIBE_PARAMETERS struct {
callback uintptr
context uintptr
}
powrprof := windowsLoadSystemLib([]byte("powrprof.dll\000"))
if powrprof == 0 {
return // Running on Windows 7, where we don't need it anyway.
}
powerRegisterSuspendResumeNotification := windowsFindfunc(powrprof, []byte("PowerRegisterSuspendResumeNotification\000"))
if powerRegisterSuspendResumeNotification == nil {
return // Running on Windows 7, where we don't need it anyway.
}
var fn interface{} = func(context uintptr, changeType uint32, setting uintptr) uintptr {
for mp := (*m)(atomic.Loadp(unsafe.Pointer(&allm))); mp != nil; mp = mp.alllink {
if mp.resumesema != 0 {
stdcall1(_SetEvent, mp.resumesema)
}
}
return 0
}
params := _DEVICE_NOTIFY_SUBSCRIBE_PARAMETERS{
callback: compileCallback(*efaceOf(&fn), true),
}
handle := uintptr(0)
if stdcall3(powerRegisterSuspendResumeNotification, _DEVICE_NOTIFY_CALLBACK,
uintptr(unsafe.Pointer(¶ms)),
uintptr(unsafe.Pointer(&handle))) != 0 {
throw("PowerRegisterSuspendResumeNotification failure")
}
}
//go:nosplit
func getLoadLibrary() uintptr {
return uintptr(unsafe.Pointer(_LoadLibraryW))
}
//go:nosplit
func getLoadLibraryEx() uintptr {
return uintptr(unsafe.Pointer(_LoadLibraryExW))
}
//go:nosplit
func getGetProcAddress() uintptr {
return uintptr(unsafe.Pointer(_GetProcAddress))
}
func getproccount() int32 {
var mask, sysmask uintptr
ret := stdcall3(_GetProcessAffinityMask, currentProcess, uintptr(unsafe.Pointer(&mask)), uintptr(unsafe.Pointer(&sysmask)))
if ret != 0 {
n := 0
maskbits := int(unsafe.Sizeof(mask) * 8)
for i := 0; i < maskbits; i++ {
if mask&(1<<uint(i)) != 0 {
n++
}
}
if n != 0 {
return int32(n)
}
}
// use GetSystemInfo if GetProcessAffinityMask fails
var info systeminfo
stdcall1(_GetSystemInfo, uintptr(unsafe.Pointer(&info)))
return int32(info.dwnumberofprocessors)
}
func getPageSize() uintptr {
var info systeminfo
stdcall1(_GetSystemInfo, uintptr(unsafe.Pointer(&info)))
return uintptr(info.dwpagesize)
}
const (
currentProcess = ^uintptr(0) // -1 = current process
currentThread = ^uintptr(1) // -2 = current thread
)
// in sys_windows_386.s and sys_windows_amd64.s:
func externalthreadhandler()
func getlasterror() uint32
func setlasterror(err uint32)
// When loading DLLs, we prefer to use LoadLibraryEx with
// LOAD_LIBRARY_SEARCH_* flags, if available. LoadLibraryEx is not
// available on old Windows, though, and the LOAD_LIBRARY_SEARCH_*
// flags are not available on some versions of Windows without a
// security patch.
//
// https://msdn.microsoft.com/en-us/library/ms684179(v=vs.85).aspx says:
// "Windows 7, Windows Server 2008 R2, Windows Vista, and Windows
// Server 2008: The LOAD_LIBRARY_SEARCH_* flags are available on
// systems that have KB2533623 installed. To determine whether the
// flags are available, use GetProcAddress to get the address of the
// AddDllDirectory, RemoveDllDirectory, or SetDefaultDllDirectories
// function. If GetProcAddress succeeds, the LOAD_LIBRARY_SEARCH_*
// flags can be used with LoadLibraryEx."
var useLoadLibraryEx bool
var timeBeginPeriodRetValue uint32
// osRelaxMinNS indicates that sysmon shouldn't osRelax if the next
// timer is less than 60 ms from now. Since osRelaxing may reduce
// timer resolution to 15.6 ms, this keeps timer error under roughly 1
// part in 4.
const osRelaxMinNS = 60 * 1e6
// osRelax is called by the scheduler when transitioning to and from
// all Ps being idle.
//
// On Windows, it adjusts the system-wide timer resolution. Go needs a
// high resolution timer while running and there's little extra cost
// if we're already using the CPU, but if all Ps are idle there's no
// need to consume extra power to drive the high-res timer.
func osRelax(relax bool) uint32 {
if relax {
return uint32(stdcall1(_timeEndPeriod, 1))
} else {
return uint32(stdcall1(_timeBeginPeriod, 1))
}
}
func osinit() {
asmstdcallAddr = unsafe.Pointer(funcPC(asmstdcall))
usleep2Addr = unsafe.Pointer(funcPC(usleep2))
switchtothreadAddr = unsafe.Pointer(funcPC(switchtothread))
setBadSignalMsg()
loadOptionalSyscalls()
disableWER()
initExceptionHandler()
stdcall2(_SetConsoleCtrlHandler, funcPC(ctrlhandler), 1)
timeBeginPeriodRetValue = osRelax(false)
ncpu = getproccount()
physPageSize = getPageSize()
// Windows dynamic priority boosting assumes that a process has different types
// of dedicated threads -- GUI, IO, computational, etc. Go processes use
// equivalent threads that all do a mix of GUI, IO, computations, etc.
// In such context dynamic priority boosting does nothing but harm, so we turn it off.
stdcall2(_SetProcessPriorityBoost, currentProcess, 1)
}
func nanotime() int64
// useQPCTime controls whether time.now and nanotime use QueryPerformanceCounter.
// This is only set to 1 when running under Wine.
var useQPCTime uint8
var qpcStartCounter int64
var qpcMultiplier int64
//go:nosplit
func nanotimeQPC() int64 {
var counter int64 = 0
stdcall1(_QueryPerformanceCounter, uintptr(unsafe.Pointer(&counter)))
// returns number of nanoseconds
return (counter - qpcStartCounter) * qpcMultiplier
}
//go:nosplit
func nowQPC() (sec int64, nsec int32, mono int64) {
var ft int64
stdcall1(_GetSystemTimeAsFileTime, uintptr(unsafe.Pointer(&ft)))
t := (ft - 116444736000000000) * 100
sec = t / 1000000000
nsec = int32(t - sec*1000000000)
mono = nanotimeQPC()
return
}
func initWine(k32 uintptr) {
_GetSystemTimeAsFileTime = windowsFindfunc(k32, []byte("GetSystemTimeAsFileTime\000"))
if _GetSystemTimeAsFileTime == nil {
throw("could not find GetSystemTimeAsFileTime() syscall")
}
_QueryPerformanceCounter = windowsFindfunc(k32, []byte("QueryPerformanceCounter\000"))
_QueryPerformanceFrequency = windowsFindfunc(k32, []byte("QueryPerformanceFrequency\000"))
if _QueryPerformanceCounter == nil || _QueryPerformanceFrequency == nil {
throw("could not find QPC syscalls")
}
// We can not simply fallback to GetSystemTimeAsFileTime() syscall, since its time is not monotonic,
// instead we use QueryPerformanceCounter family of syscalls to implement monotonic timer
// https://msdn.microsoft.com/en-us/library/windows/desktop/dn553408(v=vs.85).aspx
var tmp int64
stdcall1(_QueryPerformanceFrequency, uintptr(unsafe.Pointer(&tmp)))
if tmp == 0 {
throw("QueryPerformanceFrequency syscall returned zero, running on unsupported hardware")
}
// This should not overflow, it is a number of ticks of the performance counter per second,
// its resolution is at most 10 per usecond (on Wine, even smaller on real hardware), so it will be at most 10 millions here,
// panic if overflows.
if tmp > (1<<31 - 1) {
throw("QueryPerformanceFrequency overflow 32 bit divider, check nosplit discussion to proceed")
}
qpcFrequency := int32(tmp)
stdcall1(_QueryPerformanceCounter, uintptr(unsafe.Pointer(&qpcStartCounter)))
// Since we are supposed to run this time calls only on Wine, it does not lose precision,
// since Wine's timer is kind of emulated at 10 Mhz, so it will be a nice round multiplier of 100
// but for general purpose system (like 3.3 Mhz timer on i7) it will not be very precise.
// We have to do it this way (or similar), since multiplying QPC counter by 100 millions overflows
// int64 and resulted time will always be invalid.
qpcMultiplier = int64(timediv(1000000000, qpcFrequency, nil))
useQPCTime = 1
}
//go:nosplit
func getRandomData(r []byte) {
n := 0
if stdcall2(_RtlGenRandom, uintptr(unsafe.Pointer(&r[0])), uintptr(len(r)))&0xff != 0 {
n = len(r)
}
extendRandom(r, n)
}
func goenvs() {
// strings is a pointer to environment variable pairs in the form:
// "envA=valA\x00envB=valB\x00\x00" (in UTF-16)
// Two consecutive zero bytes end the list.
strings := unsafe.Pointer(stdcall0(_GetEnvironmentStringsW))
p := (*[1 << 24]uint16)(strings)[:]
n := 0
for from, i := 0, 0; true; i++ {
if p[i] == 0 {
// empty string marks the end
if i == from {
break
}
from = i + 1
n++
}
}
envs = make([]string, n)
for i := range envs {
envs[i] = gostringw(&p[0])
for p[0] != 0 {
p = p[1:]
}
p = p[1:] // skip nil byte
}
stdcall1(_FreeEnvironmentStringsW, uintptr(strings))
// We call this all the way here, late in init, so that malloc works
// for the callback function this generates.
monitorSuspendResume()
}
// exiting is set to non-zero when the process is exiting.
var exiting uint32
//go:nosplit
func exit(code int32) {
atomic.Store(&exiting, 1)
stdcall1(_ExitProcess, uintptr(code))
}
//go:nosplit
func write(fd uintptr, buf unsafe.Pointer, n int32) int32 {
const (
_STD_OUTPUT_HANDLE = ^uintptr(10) // -11
_STD_ERROR_HANDLE = ^uintptr(11) // -12
)
var handle uintptr
switch fd {
case 1:
handle = stdcall1(_GetStdHandle, _STD_OUTPUT_HANDLE)
case 2:
handle = stdcall1(_GetStdHandle, _STD_ERROR_HANDLE)
default:
// assume fd is real windows handle.
handle = fd
}
isASCII := true
b := (*[1 << 30]byte)(buf)[:n]
for _, x := range b {
if x >= 0x80 {
isASCII = false
break
}
}
if !isASCII {
var m uint32
isConsole := stdcall2(_GetConsoleMode, handle, uintptr(unsafe.Pointer(&m))) != 0
// If this is a console output, various non-unicode code pages can be in use.
// Use the dedicated WriteConsole call to ensure unicode is printed correctly.
if isConsole {
return int32(writeConsole(handle, buf, n))
}
}
var written uint32
stdcall5(_WriteFile, handle, uintptr(buf), uintptr(n), uintptr(unsafe.Pointer(&written)), 0)
return int32(written)
}
var (
utf16ConsoleBack [1000]uint16
utf16ConsoleBackLock mutex
)
// writeConsole writes bufLen bytes from buf to the console File.
// It returns the number of bytes written.
func writeConsole(handle uintptr, buf unsafe.Pointer, bufLen int32) int {
const surr2 = (surrogateMin + surrogateMax + 1) / 2
// Do not use defer for unlock. May cause issues when printing a panic.
lock(&utf16ConsoleBackLock)
b := (*[1 << 30]byte)(buf)[:bufLen]
s := *(*string)(unsafe.Pointer(&b))
utf16tmp := utf16ConsoleBack[:]
total := len(s)
w := 0
for _, r := range s {
if w >= len(utf16tmp)-2 {
writeConsoleUTF16(handle, utf16tmp[:w])
w = 0
}
if r < 0x10000 {
utf16tmp[w] = uint16(r)
w++
} else {
r -= 0x10000
utf16tmp[w] = surrogateMin + uint16(r>>10)&0x3ff
utf16tmp[w+1] = surr2 + uint16(r)&0x3ff
w += 2
}
}
writeConsoleUTF16(handle, utf16tmp[:w])
unlock(&utf16ConsoleBackLock)
return total
}
// writeConsoleUTF16 is the dedicated windows calls that correctly prints
// to the console regardless of the current code page. Input is utf-16 code points.
// The handle must be a console handle.
func writeConsoleUTF16(handle uintptr, b []uint16) {
l := uint32(len(b))
if l == 0 {
return
}
var written uint32
stdcall5(_WriteConsoleW,
handle,
uintptr(unsafe.Pointer(&b[0])),
uintptr(l),
uintptr(unsafe.Pointer(&written)),
0,
)
return
}
//go:nosplit
func semasleep(ns int64) int32 {
const (
_WAIT_ABANDONED = 0x00000080
_WAIT_OBJECT_0 = 0x00000000
_WAIT_TIMEOUT = 0x00000102
_WAIT_FAILED = 0xFFFFFFFF
)
var result uintptr
if ns < 0 {
result = stdcall2(_WaitForSingleObject, getg().m.waitsema, uintptr(_INFINITE))
} else {
start := nanotime()
elapsed := int64(0)
for {
ms := int64(timediv(ns-elapsed, 1000000, nil))
if ms == 0 {
ms = 1
}
result = stdcall4(_WaitForMultipleObjects, 2,
uintptr(unsafe.Pointer(&[2]uintptr{getg().m.waitsema, getg().m.resumesema})),
0, uintptr(ms))
if result != _WAIT_OBJECT_0+1 {
// Not a suspend/resume event
break
}
elapsed = nanotime() - start
if elapsed >= ns {
return -1
}
}
}
switch result {
case _WAIT_OBJECT_0: // Signaled
return 0
case _WAIT_TIMEOUT:
return -1
case _WAIT_ABANDONED:
systemstack(func() {
throw("runtime.semasleep wait_abandoned")
})
case _WAIT_FAILED:
systemstack(func() {
print("runtime: waitforsingleobject wait_failed; errno=", getlasterror(), "\n")
throw("runtime.semasleep wait_failed")
})
default:
systemstack(func() {
print("runtime: waitforsingleobject unexpected; result=", result, "\n")
throw("runtime.semasleep unexpected")
})
}
return -1 // unreachable
}
//go:nosplit
func semawakeup(mp *m) {
if stdcall1(_SetEvent, mp.waitsema) == 0 {
systemstack(func() {
print("runtime: setevent failed; errno=", getlasterror(), "\n")
throw("runtime.semawakeup")
})
}
}
//go:nosplit
func semacreate(mp *m) {
if mp.waitsema != 0 {
return
}
mp.waitsema = stdcall4(_CreateEventA, 0, 0, 0, 0)
if mp.waitsema == 0 {
systemstack(func() {
print("runtime: createevent failed; errno=", getlasterror(), "\n")
throw("runtime.semacreate")
})
}
mp.resumesema = stdcall4(_CreateEventA, 0, 0, 0, 0)
if mp.resumesema == 0 {
systemstack(func() {
print("runtime: createevent failed; errno=", getlasterror(), "\n")
throw("runtime.semacreate")
})
stdcall1(_CloseHandle, mp.waitsema)
mp.waitsema = 0
}
}
// May run with m.p==nil, so write barriers are not allowed. This
// function is called by newosproc0, so it is also required to
// operate without stack guards.
//go:nowritebarrierrec
//go:nosplit
func newosproc(mp *m) {
// We pass 0 for the stack size to use the default for this binary.
thandle := stdcall6(_CreateThread, 0, 0,
funcPC(tstart_stdcall), uintptr(unsafe.Pointer(mp)),
0, 0)
if thandle == 0 {
if atomic.Load(&exiting) != 0 {
// CreateThread may fail if called
// concurrently with ExitProcess. If this
// happens, just freeze this thread and let
// the process exit. See issue #18253.
lock(&deadlock)
lock(&deadlock)
}
print("runtime: failed to create new OS thread (have ", mcount(), " already; errno=", getlasterror(), ")\n")
throw("runtime.newosproc")
}
// Close thandle to avoid leaking the thread object if it exits.
stdcall1(_CloseHandle, thandle)
}
// Used by the C library build mode. On Linux this function would allocate a
// stack, but that's not necessary for Windows. No stack guards are present
// and the GC has not been initialized, so write barriers will fail.
//go:nowritebarrierrec
//go:nosplit
func newosproc0(mp *m, stk unsafe.Pointer) {
// TODO: this is completely broken. The args passed to newosproc0 (in asm_amd64.s)
// are stacksize and function, not *m and stack.
// Check os_linux.go for an implemention that might actually work.
throw("bad newosproc0")
}
func exitThread(wait *uint32) {
// We should never reach exitThread on Windows because we let
// the OS clean up threads.
throw("exitThread")
}
// Called to initialize a new m (including the bootstrap m).
// Called on the parent thread (main thread in case of bootstrap), can allocate memory.
func mpreinit(mp *m) {
}
//go:nosplit
func msigsave(mp *m) {
}
//go:nosplit
func msigrestore(sigmask sigset) {
}
//go:nosplit
//go:nowritebarrierrec
func clearSignalHandlers() {
}
//go:nosplit
func sigblock() {
}
// Called to initialize a new m (including the bootstrap m).
// Called on the new thread, cannot allocate memory.
func minit() {
var thandle uintptr
stdcall7(_DuplicateHandle, currentProcess, currentThread, currentProcess, uintptr(unsafe.Pointer(&thandle)), 0, 0, _DUPLICATE_SAME_ACCESS)
atomic.Storeuintptr(&getg().m.thread, thandle)
// Query the true stack base from the OS. Currently we're
// running on a small assumed stack.
var mbi memoryBasicInformation
res := stdcall3(_VirtualQuery, uintptr(unsafe.Pointer(&mbi)), uintptr(unsafe.Pointer(&mbi)), unsafe.Sizeof(mbi))
if res == 0 {
print("runtime: VirtualQuery failed; errno=", getlasterror(), "\n")
throw("VirtualQuery for stack base failed")
}
// The system leaves an 8K PAGE_GUARD region at the bottom of
// the stack (in theory VirtualQuery isn't supposed to include
// that, but it does). Add an additional 8K of slop for
// calling C functions that don't have stack checks and for
// lastcontinuehandler. We shouldn't be anywhere near this
// bound anyway.
base := mbi.allocationBase + 16<<10
// Sanity check the stack bounds.
g0 := getg()
if base > g0.stack.hi || g0.stack.hi-base > 64<<20 {
print("runtime: g0 stack [", hex(base), ",", hex(g0.stack.hi), ")\n")
throw("bad g0 stack")
}
g0.stack.lo = base
g0.stackguard0 = g0.stack.lo + _StackGuard
g0.stackguard1 = g0.stackguard0
// Sanity check the SP.
stackcheck()
}
// Called from dropm to undo the effect of an minit.
//go:nosplit
func unminit() {
tp := &getg().m.thread
stdcall1(_CloseHandle, *tp)
*tp = 0
}
// Calling stdcall on os stack.
// May run during STW, so write barriers are not allowed.
//go:nowritebarrier
//go:nosplit
func stdcall(fn stdFunction) uintptr {
gp := getg()
mp := gp.m
mp.libcall.fn = uintptr(unsafe.Pointer(fn))
resetLibcall := false
if mp.profilehz != 0 && mp.libcallsp == 0 {
// leave pc/sp for cpu profiler
mp.libcallg.set(gp)
mp.libcallpc = getcallerpc()
// sp must be the last, because once async cpu profiler finds
// all three values to be non-zero, it will use them
mp.libcallsp = getcallersp()
resetLibcall = true // See comment in sys_darwin.go:libcCall
}
asmcgocall(asmstdcallAddr, unsafe.Pointer(&mp.libcall))
if resetLibcall {
mp.libcallsp = 0
}
return mp.libcall.r1
}
//go:nosplit
func stdcall0(fn stdFunction) uintptr {
mp := getg().m
mp.libcall.n = 0
mp.libcall.args = uintptr(noescape(unsafe.Pointer(&fn))) // it's unused but must be non-nil, otherwise crashes
return stdcall(fn)
}
//go:nosplit
func stdcall1(fn stdFunction, a0 uintptr) uintptr {
mp := getg().m
mp.libcall.n = 1
mp.libcall.args = uintptr(noescape(unsafe.Pointer(&a0)))
return stdcall(fn)
}
//go:nosplit
func stdcall2(fn stdFunction, a0, a1 uintptr) uintptr {
mp := getg().m
mp.libcall.n = 2
mp.libcall.args = uintptr(noescape(unsafe.Pointer(&a0)))
return stdcall(fn)
}
//go:nosplit
func stdcall3(fn stdFunction, a0, a1, a2 uintptr) uintptr {
mp := getg().m
mp.libcall.n = 3
mp.libcall.args = uintptr(noescape(unsafe.Pointer(&a0)))
return stdcall(fn)
}
//go:nosplit
func stdcall4(fn stdFunction, a0, a1, a2, a3 uintptr) uintptr {
mp := getg().m
mp.libcall.n = 4
mp.libcall.args = uintptr(noescape(unsafe.Pointer(&a0)))
return stdcall(fn)
}
//go:nosplit
func stdcall5(fn stdFunction, a0, a1, a2, a3, a4 uintptr) uintptr {
mp := getg().m
mp.libcall.n = 5
mp.libcall.args = uintptr(noescape(unsafe.Pointer(&a0)))
return stdcall(fn)
}
//go:nosplit
func stdcall6(fn stdFunction, a0, a1, a2, a3, a4, a5 uintptr) uintptr {
mp := getg().m
mp.libcall.n = 6
mp.libcall.args = uintptr(noescape(unsafe.Pointer(&a0)))
return stdcall(fn)
}
//go:nosplit
func stdcall7(fn stdFunction, a0, a1, a2, a3, a4, a5, a6 uintptr) uintptr {
mp := getg().m
mp.libcall.n = 7
mp.libcall.args = uintptr(noescape(unsafe.Pointer(&a0)))
return stdcall(fn)
}
// in sys_windows_386.s and sys_windows_amd64.s
func onosstack(fn unsafe.Pointer, arg uint32)
func usleep2(usec uint32)
func switchtothread()
var usleep2Addr unsafe.Pointer
var switchtothreadAddr unsafe.Pointer
//go:nosplit
func osyield() {
onosstack(switchtothreadAddr, 0)
}
//go:nosplit
func usleep(us uint32) {
// Have 1us units; want 100ns units.
onosstack(usleep2Addr, 10*us)
}
func ctrlhandler1(_type uint32) uint32 {
var s uint32
switch _type {
case _CTRL_C_EVENT, _CTRL_BREAK_EVENT:
s = _SIGINT
default:
return 0
}
if sigsend(s) {
return 1
}
exit(2) // SIGINT, SIGTERM, etc
return 0
}
// in sys_windows_386.s and sys_windows_amd64.s
func profileloop()
// called from zcallback_windows_*.s to sys_windows_*.s
func callbackasm1()
var profiletimer uintptr
func profilem(mp *m, thread uintptr) {
var r *context
rbuf := make([]byte, unsafe.Sizeof(*r)+15)
// align Context to 16 bytes
r = (*context)(unsafe.Pointer((uintptr(unsafe.Pointer(&rbuf[15]))) &^ 15))
r.contextflags = _CONTEXT_CONTROL
stdcall2(_GetThreadContext, thread, uintptr(unsafe.Pointer(r)))
var gp *g
switch GOARCH {
default:
panic("unsupported architecture")
case "arm":
tls := &mp.tls[0]
gp = **((***g)(unsafe.Pointer(tls)))
case "386", "amd64":
tls := &mp.tls[0]
gp = *((**g)(unsafe.Pointer(tls)))
}
sigprof(r.ip(), r.sp(), r.lr(), gp, mp)
}
func profileloop1(param uintptr) uint32 {
stdcall2(_SetThreadPriority, currentThread, _THREAD_PRIORITY_HIGHEST)
for {
stdcall2(_WaitForSingleObject, profiletimer, _INFINITE)
first := (*m)(atomic.Loadp(unsafe.Pointer(&allm)))
for mp := first; mp != nil; mp = mp.alllink {
thread := atomic.Loaduintptr(&mp.thread)
// Do not profile threads blocked on Notes,
// this includes idle worker threads,
// idle timer thread, idle heap scavenger, etc.
if thread == 0 || mp.profilehz == 0 || mp.blocked {
continue
}
// mp may exit between the load above and the
// SuspendThread, so be careful.
if int32(stdcall1(_SuspendThread, thread)) == -1 {
// The thread no longer exists.
continue
}
if mp.profilehz != 0 && !mp.blocked {
// Pass the thread handle in case mp
// was in the process of shutting down.
profilem(mp, thread)
}
stdcall1(_ResumeThread, thread)
}
}
}
func setProcessCPUProfiler(hz int32) {
if profiletimer == 0 {
timer := stdcall3(_CreateWaitableTimerA, 0, 0, 0)
atomic.Storeuintptr(&profiletimer, timer)
thread := stdcall6(_CreateThread, 0, 0, funcPC(profileloop), 0, 0, 0)
stdcall2(_SetThreadPriority, thread, _THREAD_PRIORITY_HIGHEST)
stdcall1(_CloseHandle, thread)
}
}
func setThreadCPUProfiler(hz int32) {
ms := int32(0)
due := ^int64(^uint64(1 << 63))
if hz > 0 {
ms = 1000 / hz
if ms == 0 {
ms = 1
}
due = int64(ms) * -10000
}
stdcall6(_SetWaitableTimer, profiletimer, uintptr(unsafe.Pointer(&due)), uintptr(ms), 0, 0, 0)
atomic.Store((*uint32)(unsafe.Pointer(&getg().m.profilehz)), uint32(hz))
}
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