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// 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._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._VirtualAlloc VirtualAlloc%4 "kernel32.dll"
//go:cgo_import_dynamic runtime._VirtualFree VirtualFree%3 "kernel32.dll"
//go:cgo_import_dynamic runtime._WSAGetOverlappedResult WSAGetOverlappedResult%5 "ws2_32.dll"
//go:cgo_import_dynamic runtime._WaitForSingleObject WaitForSingleObject%2 "kernel32.dll"
//go:cgo_import_dynamic runtime._WriteConsoleW WriteConsoleW%5 "kernel32.dll"
//go:cgo_import_dynamic runtime._WriteFile WriteFile%5 "kernel32.dll"
//go:cgo_import_dynamic runtime._timeBeginPeriod timeBeginPeriod%1 "winmm.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,
_GetSystemInfo,
_GetThreadContext,
_LoadLibraryW,
_LoadLibraryA,
_ResumeThread,
_SetConsoleCtrlHandler,
_SetErrorMode,
_SetEvent,
_SetProcessPriorityBoost,
_SetThreadPriority,
_SetUnhandledExceptionFilter,
_SetWaitableTimer,
_SuspendThread,
_SwitchToThread,
_VirtualAlloc,
_VirtualFree,
_WSAGetOverlappedResult,
_WaitForSingleObject,
_WriteConsoleW,
_WriteFile,
_timeBeginPeriod,
_ stdFunction
// Following syscalls are only available on some Windows PCs.
// We will load syscalls, if available, before using them.
_AddDllDirectory,
_AddVectoredContinueHandler,
_GetQueuedCompletionStatusEx,
_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
)
// Function to be called by windows CreateThread
// to start new os thread.
func tstart_stdcall(newm *m) uint32
func ctrlhandler(_type uint32) uint32
type mOS struct {
waitsema uintptr // semaphore for parking on locks
}
//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))
}
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"))
_LoadLibraryExW = windowsFindfunc(k32, []byte("LoadLibraryExW\000"))
var advapi32dll = []byte("advapi32.dll\000")
a32 := stdcall1(_LoadLibraryA, uintptr(unsafe.Pointer(&advapi32dll[0])))
if a32 == 0 {
throw("advapi32.dll not found")
}
_RtlGenRandom = windowsFindfunc(a32, []byte("SystemFunction036\000"))
var ntdll = []byte("ntdll.dll\000")
n32 := stdcall1(_LoadLibraryA, uintptr(unsafe.Pointer(&ntdll[0])))
if n32 == 0 {
throw("ntdll.dll not found")
}
_NtWaitForSingleObject = windowsFindfunc(n32, []byte("NtWaitForSingleObject\000"))
}
//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
func osinit() {
asmstdcallAddr = unsafe.Pointer(funcPC(asmstdcall))
usleep2Addr = unsafe.Pointer(funcPC(usleep2))
switchtothreadAddr = unsafe.Pointer(funcPC(switchtothread))
setBadSignalMsg()
loadOptionalSyscalls()
useLoadLibraryEx = (_LoadLibraryExW != nil && _AddDllDirectory != nil)
disableWER()
externalthreadhandlerp = funcPC(externalthreadhandler)
initExceptionHandler()
stdcall2(_SetConsoleCtrlHandler, funcPC(ctrlhandler), 1)
timeBeginPeriodRetValue = uint32(stdcall1(_timeBeginPeriod, 1))
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)
}
//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))
}
//go:nosplit
func exit(code int32) {
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
)
// store ms in ns to save stack space
if ns < 0 {
ns = _INFINITE
} else {
ns = int64(timediv(ns, 1000000, nil))
if ns == 0 {
ns = 1
}
}
result := stdcall2(_WaitForSingleObject, getg().m.waitsema, uintptr(ns))
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")
})
}
}
// 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:nowritebarrierc
//go:nosplit
func newosproc(mp *m, stk unsafe.Pointer) {
const _STACK_SIZE_PARAM_IS_A_RESERVATION = 0x00010000
thandle := stdcall6(_CreateThread, 0, 0x20000,
funcPC(tstart_stdcall), uintptr(unsafe.Pointer(mp)),
_STACK_SIZE_PARAM_IS_A_RESERVATION, 0)
if thandle == 0 {
print("runtime: failed to create new OS thread (have ", mcount(), " already; errno=", getlasterror(), ")\n")
throw("runtime.newosproc")
}
}
// 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:nowritebarrierc
//go:nosplit
func newosproc0(mp *m, stk unsafe.Pointer) {
newosproc(mp, stk)
}
// 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
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)
}
// Called from dropm to undo the effect of an minit.
//go:nosplit
func unminit() {
tp := &getg().m.thread
stdcall1(_CloseHandle, *tp)
*tp = 0
}
// Described in http://www.dcl.hpi.uni-potsdam.de/research/WRK/2007/08/getting-os-information-the-kuser_shared_data-structure/
type _KSYSTEM_TIME struct {
LowPart uint32
High1Time int32
High2Time int32
}
const (
_INTERRUPT_TIME = 0x7ffe0008
_SYSTEM_TIME = 0x7ffe0014
)
//go:nosplit
func systime(addr uintptr) int64 {
timeaddr := (*_KSYSTEM_TIME)(unsafe.Pointer(addr))
var t _KSYSTEM_TIME
for i := 1; i < 10000; i++ {
// these fields must be read in that order (see URL above)
t.High1Time = timeaddr.High1Time
t.LowPart = timeaddr.LowPart
t.High2Time = timeaddr.High2Time
if t.High1Time == t.High2Time {
return int64(t.High1Time)<<32 | int64(t.LowPart)
}
if (i % 100) == 0 {
osyield()
}
}
systemstack(func() {
throw("interrupt/system time is changing too fast")
})
return 0
}
//go:nosplit
func unixnano() int64 {
return (systime(_SYSTEM_TIME) - 116444736000000000) * 100
}
//go:nosplit
func nanotime() int64 {
return systime(_INTERRUPT_TIME) * 100
}
// 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))
if mp.profilehz != 0 {
// leave pc/sp for cpu profiler
mp.libcallg.set(gp)
mp.libcallpc = getcallerpc(unsafe.Pointer(&fn))
// 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(unsafe.Pointer(&fn))
}
asmcgocall(asmstdcallAddr, unsafe.Pointer(&mp.libcall))
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()
var profiletimer uintptr
func profilem(mp *m) {
var r *context
rbuf := make([]byte, unsafe.Sizeof(*r)+15)
tls := &mp.tls[0]
gp := *((**g)(unsafe.Pointer(tls)))
// align Context to 16 bytes
r = (*context)(unsafe.Pointer((uintptr(unsafe.Pointer(&rbuf[15]))) &^ 15))
r.contextflags = _CONTEXT_CONTROL
stdcall2(_GetThreadContext, mp.thread, uintptr(unsafe.Pointer(r)))
sigprof(r.ip(), r.sp(), 0, 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
}
stdcall1(_SuspendThread, thread)
if mp.profilehz != 0 && !mp.blocked {
profilem(mp)
}
stdcall1(_ResumeThread, thread)
}
}
}
var cpuprofilerlock mutex
func resetcpuprofiler(hz int32) {
lock(&cpuprofilerlock)
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)
}
unlock(&cpuprofilerlock)
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))
}
func memlimit() uintptr {
return 0
}