mirror of
https://github.com/golang/go
synced 2024-10-01 22:18:32 -06:00
b7f1777a70
Replace thread creation with calls to the pthread library in libc. Update #17490 Change-Id: I1e19965c45255deb849b059231252fc6a7861d6c Reviewed-on: https://go-review.googlesource.com/108679 Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
281 lines
5.7 KiB
Go
281 lines
5.7 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package runtime
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import (
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"runtime/internal/sys"
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"unsafe"
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)
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const (
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_NSIG = 33
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_SI_USER = 0
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_SS_DISABLE = 4
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_SIG_BLOCK = 1
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_SIG_UNBLOCK = 2
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_SIG_SETMASK = 3
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)
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type mOS struct{}
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//go:noescape
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func lwp_create(param *lwpparams) int32
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//go:noescape
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func sigaltstack(new, old *stackt)
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//go:noescape
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func sigaction(sig uint32, new, old *sigactiont)
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//go:noescape
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func sigprocmask(how int32, new, old *sigset)
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//go:noescape
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func setitimer(mode int32, new, old *itimerval)
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//go:noescape
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func sysctl(mib *uint32, miblen uint32, out *byte, size *uintptr, dst *byte, ndst uintptr) int32
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func raise(sig uint32)
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func raiseproc(sig uint32)
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//go:noescape
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func sys_umtx_sleep(addr *uint32, val, timeout int32) int32
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//go:noescape
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func sys_umtx_wakeup(addr *uint32, val int32) int32
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func osyield()
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const stackSystem = 0
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// From DragonFly's <sys/sysctl.h>
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const (
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_CTL_HW = 6
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_HW_NCPU = 3
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_HW_PAGESIZE = 7
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)
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var sigset_all = sigset{[4]uint32{^uint32(0), ^uint32(0), ^uint32(0), ^uint32(0)}}
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func getncpu() int32 {
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mib := [2]uint32{_CTL_HW, _HW_NCPU}
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out := uint32(0)
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nout := unsafe.Sizeof(out)
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ret := sysctl(&mib[0], 2, (*byte)(unsafe.Pointer(&out)), &nout, nil, 0)
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if ret >= 0 {
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return int32(out)
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}
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return 1
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}
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func getPageSize() uintptr {
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mib := [2]uint32{_CTL_HW, _HW_PAGESIZE}
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out := uint32(0)
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nout := unsafe.Sizeof(out)
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ret := sysctl(&mib[0], 2, (*byte)(unsafe.Pointer(&out)), &nout, nil, 0)
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if ret >= 0 {
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return uintptr(out)
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}
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return 0
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}
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//go:nosplit
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func futexsleep(addr *uint32, val uint32, ns int64) {
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systemstack(func() {
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futexsleep1(addr, val, ns)
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})
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}
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func futexsleep1(addr *uint32, val uint32, ns int64) {
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var timeout int32
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if ns >= 0 {
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// The timeout is specified in microseconds - ensure that we
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// do not end up dividing to zero, which would put us to sleep
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// indefinitely...
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timeout = timediv(ns, 1000, nil)
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if timeout == 0 {
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timeout = 1
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}
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}
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// sys_umtx_sleep will return EWOULDBLOCK (EAGAIN) when the timeout
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// expires or EBUSY if the mutex value does not match.
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ret := sys_umtx_sleep(addr, int32(val), timeout)
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if ret >= 0 || ret == -_EINTR || ret == -_EAGAIN || ret == -_EBUSY {
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return
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}
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print("umtx_sleep addr=", addr, " val=", val, " ret=", ret, "\n")
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*(*int32)(unsafe.Pointer(uintptr(0x1005))) = 0x1005
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}
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//go:nosplit
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func futexwakeup(addr *uint32, cnt uint32) {
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ret := sys_umtx_wakeup(addr, int32(cnt))
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if ret >= 0 {
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return
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}
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systemstack(func() {
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print("umtx_wake_addr=", addr, " ret=", ret, "\n")
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*(*int32)(unsafe.Pointer(uintptr(0x1006))) = 0x1006
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})
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}
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func lwp_start(uintptr)
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// May run with m.p==nil, so write barriers are not allowed.
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//go:nowritebarrier
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func newosproc(mp *m) {
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stk := unsafe.Pointer(mp.g0.stack.hi)
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if false {
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print("newosproc stk=", stk, " m=", mp, " g=", mp.g0, " lwp_start=", funcPC(lwp_start), " id=", mp.id, " ostk=", &mp, "\n")
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}
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var oset sigset
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sigprocmask(_SIG_SETMASK, &sigset_all, &oset)
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params := lwpparams{
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start_func: funcPC(lwp_start),
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arg: unsafe.Pointer(mp),
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stack: uintptr(stk),
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tid1: unsafe.Pointer(&mp.procid),
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tid2: nil,
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}
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// TODO: Check for error.
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lwp_create(¶ms)
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sigprocmask(_SIG_SETMASK, &oset, nil)
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}
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func osinit() {
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ncpu = getncpu()
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if physPageSize == 0 {
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physPageSize = getPageSize()
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}
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}
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var urandom_dev = []byte("/dev/urandom\x00")
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//go:nosplit
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func getRandomData(r []byte) {
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fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0)
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n := read(fd, unsafe.Pointer(&r[0]), int32(len(r)))
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closefd(fd)
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extendRandom(r, int(n))
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}
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func goenvs() {
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goenvs_unix()
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}
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// Called to initialize a new m (including the bootstrap m).
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// Called on the parent thread (main thread in case of bootstrap), can allocate memory.
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func mpreinit(mp *m) {
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mp.gsignal = malg(32 * 1024)
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mp.gsignal.m = mp
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}
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// Called to initialize a new m (including the bootstrap m).
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// Called on the new thread, cannot allocate memory.
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func minit() {
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// m.procid is a uint64, but lwp_start writes an int32. Fix it up.
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_g_ := getg()
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_g_.m.procid = uint64(*(*int32)(unsafe.Pointer(&_g_.m.procid)))
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minitSignals()
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}
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// Called from dropm to undo the effect of an minit.
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//go:nosplit
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func unminit() {
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unminitSignals()
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}
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func sigtramp()
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type sigactiont struct {
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sa_sigaction uintptr
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sa_flags int32
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sa_mask sigset
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}
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//go:nosplit
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//go:nowritebarrierrec
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func setsig(i uint32, fn uintptr) {
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var sa sigactiont
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sa.sa_flags = _SA_SIGINFO | _SA_ONSTACK | _SA_RESTART
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sa.sa_mask = sigset_all
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if fn == funcPC(sighandler) {
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fn = funcPC(sigtramp)
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}
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sa.sa_sigaction = fn
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sigaction(i, &sa, nil)
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}
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//go:nosplit
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//go:nowritebarrierrec
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func setsigstack(i uint32) {
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throw("setsigstack")
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}
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//go:nosplit
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//go:nowritebarrierrec
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func getsig(i uint32) uintptr {
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var sa sigactiont
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sigaction(i, nil, &sa)
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return sa.sa_sigaction
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}
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// setSignaltstackSP sets the ss_sp field of a stackt.
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//go:nosplit
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func setSignalstackSP(s *stackt, sp uintptr) {
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s.ss_sp = sp
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}
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//go:nosplit
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//go:nowritebarrierrec
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func sigaddset(mask *sigset, i int) {
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mask.__bits[(i-1)/32] |= 1 << ((uint32(i) - 1) & 31)
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}
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func sigdelset(mask *sigset, i int) {
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mask.__bits[(i-1)/32] &^= 1 << ((uint32(i) - 1) & 31)
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}
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func (c *sigctxt) fixsigcode(sig uint32) {
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}
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func sysargs(argc int32, argv **byte) {
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n := argc + 1
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// skip over argv, envp to get to auxv
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for argv_index(argv, n) != nil {
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n++
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}
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// skip NULL separator
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n++
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auxv := (*[1 << 28]uintptr)(add(unsafe.Pointer(argv), uintptr(n)*sys.PtrSize))
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sysauxv(auxv[:])
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}
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const (
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_AT_NULL = 0
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_AT_PAGESZ = 6
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)
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func sysauxv(auxv []uintptr) {
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for i := 0; auxv[i] != _AT_NULL; i += 2 {
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tag, val := auxv[i], auxv[i+1]
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switch tag {
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case _AT_PAGESZ:
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physPageSize = val
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}
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}
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}
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