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os: consolidate os{1,2}_*.go files
Change-Id: I463ca59f486b2842f67f151a55f530ee10663830 Reviewed-on: https://go-review.googlesource.com/21568 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Dave Cheney <dave@cheney.net> Reviewed-by: Minux Ma <minux@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Brad Fitzpatrick
parent
fd2bb1e30a
commit
8455f3a3d5
13 changed files with 609 additions and 659 deletions
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@ -4,7 +4,23 @@
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package runtime
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import "unsafe"
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import (
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"runtime/internal/atomic"
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"unsafe"
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)
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const (
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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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_NSIG = 33
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_SI_USER = 0
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// From NetBSD's <sys/ucontext.h>
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_UC_SIGMASK = 0x01
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_UC_CPU = 0x04
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)
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type mOS struct {
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waitsemacount uint32
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@ -45,3 +61,268 @@ func lwp_unpark(lwp int32, hint unsafe.Pointer) int32
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func lwp_self() int32
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func osyield()
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const (
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_ESRCH = 3
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_ETIMEDOUT = 60
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// From NetBSD's <sys/time.h>
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_CLOCK_REALTIME = 0
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_CLOCK_VIRTUAL = 1
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_CLOCK_PROF = 2
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_CLOCK_MONOTONIC = 3
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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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// From NetBSD'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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)
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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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//go:nosplit
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func semacreate(mp *m) {
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}
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//go:nosplit
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func semasleep(ns int64) int32 {
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_g_ := getg()
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// Compute sleep deadline.
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var tsp *timespec
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if ns >= 0 {
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var ts timespec
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var nsec int32
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ns += nanotime()
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ts.set_sec(timediv(ns, 1000000000, &nsec))
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ts.set_nsec(nsec)
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tsp = &ts
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}
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for {
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v := atomic.Load(&_g_.m.waitsemacount)
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if v > 0 {
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if atomic.Cas(&_g_.m.waitsemacount, v, v-1) {
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return 0 // semaphore acquired
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}
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continue
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}
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// Sleep until unparked by semawakeup or timeout.
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ret := lwp_park(tsp, 0, unsafe.Pointer(&_g_.m.waitsemacount), nil)
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if ret == _ETIMEDOUT {
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return -1
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}
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}
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}
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//go:nosplit
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func semawakeup(mp *m) {
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atomic.Xadd(&mp.waitsemacount, 1)
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// From NetBSD's _lwp_unpark(2) manual:
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// "If the target LWP is not currently waiting, it will return
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// immediately upon the next call to _lwp_park()."
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ret := lwp_unpark(int32(mp.procid), unsafe.Pointer(&mp.waitsemacount))
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if ret != 0 && ret != _ESRCH {
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// semawakeup can be called on signal stack.
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systemstack(func() {
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print("thrwakeup addr=", &mp.waitsemacount, " sem=", mp.waitsemacount, " ret=", ret, "\n")
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})
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}
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}
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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, stk unsafe.Pointer) {
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if false {
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print("newosproc stk=", stk, " m=", mp, " g=", mp.g0, " id=", mp.id, " ostk=", &mp, "\n")
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}
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var uc ucontextt
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getcontext(unsafe.Pointer(&uc))
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uc.uc_flags = _UC_SIGMASK | _UC_CPU
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uc.uc_link = nil
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uc.uc_sigmask = sigset_all
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lwp_mcontext_init(&uc.uc_mcontext, stk, mp, mp.g0, funcPC(netbsdMstart))
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ret := lwp_create(unsafe.Pointer(&uc), 0, unsafe.Pointer(&mp.procid))
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if ret < 0 {
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print("runtime: failed to create new OS thread (have ", mcount()-1, " already; errno=", -ret, ")\n")
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throw("runtime.newosproc")
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}
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}
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// netbsdMStart is the function call that starts executing a newly
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// created thread. On NetBSD, a new thread inherits the signal stack
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// of the creating thread. That confuses minit, so we remove that
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// signal stack here before calling the regular mstart. It's a bit
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// baroque to remove a signal stack here only to add one in minit, but
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// it's a simple change that keeps NetBSD working like other OS's.
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// At this point all signals are blocked, so there is no race.
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//go:nosplit
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func netbsdMstart() {
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signalstack(nil)
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mstart()
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}
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func osinit() {
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ncpu = getncpu()
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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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//go:nosplit
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func msigsave(mp *m) {
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sigprocmask(_SIG_SETMASK, nil, &mp.sigmask)
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}
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//go:nosplit
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func msigrestore(sigmask sigset) {
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sigprocmask(_SIG_SETMASK, &sigmask, nil)
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}
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//go:nosplit
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func sigblock() {
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sigprocmask(_SIG_SETMASK, &sigset_all, nil)
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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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_g_ := getg()
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_g_.m.procid = uint64(lwp_self())
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// Initialize signal handling.
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// On NetBSD a thread created by pthread_create inherits the
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// signal stack of the creating thread. We always create a
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// new signal stack here, to avoid having two Go threads using
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// the same signal stack. This breaks the case of a thread
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// created in C that calls sigaltstack and then calls a Go
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// function, because we will lose track of the C code's
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// sigaltstack, but it's the best we can do.
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signalstack(&_g_.m.gsignal.stack)
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_g_.m.newSigstack = true
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// restore signal mask from m.sigmask and unblock essential signals
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nmask := _g_.m.sigmask
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for i := range sigtable {
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if sigtable[i].flags&_SigUnblock != 0 {
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nmask.__bits[(i-1)/32] &^= 1 << ((uint32(i) - 1) & 31)
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}
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}
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sigprocmask(_SIG_SETMASK, &nmask, nil)
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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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if getg().m.newSigstack {
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signalstack(nil)
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}
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}
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func memlimit() uintptr {
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return 0
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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_mask sigset
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sa_flags int32
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}
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//go:nosplit
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//go:nowritebarrierrec
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func setsig(i int32, fn uintptr, restart bool) {
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var sa sigactiont
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sa.sa_flags = _SA_SIGINFO | _SA_ONSTACK
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if restart {
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sa.sa_flags |= _SA_RESTART
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}
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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 int32) {
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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 int32) uintptr {
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var sa sigactiont
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sigaction(i, nil, &sa)
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if sa.sa_sigaction == funcPC(sigtramp) {
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return funcPC(sighandler)
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}
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return sa.sa_sigaction
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}
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//go:nosplit
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func signalstack(s *stack) {
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var st sigaltstackt
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if s == nil {
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st.ss_flags = _SS_DISABLE
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} else {
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st.ss_sp = s.lo
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st.ss_size = s.hi - s.lo
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st.ss_flags = 0
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}
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sigaltstack(&st, nil)
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}
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//go:nosplit
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//go:nowritebarrierrec
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func updatesigmask(m sigmask) {
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var mask sigset
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copy(mask.__bits[:], m[:])
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sigprocmask(_SIG_SETMASK, &mask, nil)
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}
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func unblocksig(sig int32) {
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var mask sigset
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mask.__bits[(sig-1)/32] |= 1 << ((uint32(sig) - 1) & 31)
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sigprocmask(_SIG_UNBLOCK, &mask, nil)
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}
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