32b1d51f16
This is a step toward updating libgo to 1.13. This adds the 1.13
version of the osinit function to Go code, and removes the
corresponding code from the C runtime. This should simplify future updates.
Some additional 1.13 code was brought in to simplify this change.
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/191717
From-SVN: r275010
147 lines
2.9 KiB
Go
147 lines
2.9 KiB
Go
// Copyright 2018 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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// +build aix
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package runtime
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import (
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"internal/cpu"
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"unsafe"
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)
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//extern sysconf
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func sysconf(int32) _C_long
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//extern getsystemcfg
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func getsystemcfg(int32) uint64
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type mOS struct {
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waitsema uintptr // semaphore for parking on locks
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}
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//extern malloc
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func libc_malloc(uintptr) unsafe.Pointer
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//go:noescape
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//extern sem_init
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func sem_init(sem *semt, pshared int32, value uint32) int32
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//go:noescape
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//extern sem_wait
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func sem_wait(sem *semt) int32
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//go:noescape
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//extern sem_post
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func sem_post(sem *semt) int32
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//go:noescape
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//extern sem_timedwait
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func sem_timedwait(sem *semt, timeout *timespec) int32
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//go:noescape
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//extern clock_gettime
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func clock_gettime(clock_id int64, timeout *timespec) int32
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//go:nosplit
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func semacreate(mp *m) {
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if mp.mos.waitsema != 0 {
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return
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}
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var sem *semt
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// Call libc's malloc rather than malloc. This will
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// allocate space on the C heap. We can't call malloc
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// here because it could cause a deadlock.
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sem = (*semt)(libc_malloc(unsafe.Sizeof(*sem)))
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if sem_init(sem, 0, 0) != 0 {
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throw("sem_init")
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}
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mp.mos.waitsema = uintptr(unsafe.Pointer(sem))
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}
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//go:nosplit
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func semasleep(ns int64) int32 {
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_m_ := getg().m
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if ns >= 0 {
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var ts timespec
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if clock_gettime(_CLOCK_REALTIME, &ts) != 0 {
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throw("clock_gettime")
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}
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sec := int64(ts.tv_sec) + ns/1e9
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nsec := int64(ts.tv_nsec) + ns%1e9
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if nsec >= 1e9 {
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sec++
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nsec -= 1e9
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}
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if sec != int64(timespec_sec_t(sec)) {
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// Handle overflows (timespec_sec_t is 32-bit in 32-bit applications)
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sec = 1<<31 - 1
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}
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ts.tv_sec = timespec_sec_t(sec)
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ts.tv_nsec = timespec_nsec_t(nsec)
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if sem_timedwait((*semt)(unsafe.Pointer(_m_.mos.waitsema)), &ts) != 0 {
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err := errno()
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if err == _ETIMEDOUT || err == _EAGAIN || err == _EINTR {
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return -1
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}
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println("sem_timedwait err ", err, " ts.tv_sec ", ts.tv_sec, " ts.tv_nsec ", ts.tv_nsec, " ns ", ns, " id ", _m_.id)
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throw("sem_timedwait")
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}
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return 0
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}
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for {
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r1 := sem_wait((*semt)(unsafe.Pointer(_m_.mos.waitsema)))
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if r1 == 0 {
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break
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}
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if errno() == _EINTR {
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continue
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}
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throw("sem_wait")
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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 semawakeup(mp *m) {
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if sem_post((*semt)(unsafe.Pointer(mp.mos.waitsema))) != 0 {
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throw("sem_post")
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}
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}
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func osinit() {
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ncpu = int32(sysconf(__SC_NPROCESSORS_ONLN))
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physPageSize = uintptr(sysconf(__SC_PAGE_SIZE))
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setupSystemConf()
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}
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const (
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_CLOCK_REALTIME = 9
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_CLOCK_MONOTONIC = 10
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)
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const (
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// getsystemcfg constants
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_SC_IMPL = 2
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_IMPL_POWER8 = 0x10000
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_IMPL_POWER9 = 0x20000
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)
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// setupSystemConf retrieves information about the CPU and updates
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// cpu.HWCap variables.
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func setupSystemConf() {
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impl := getsystemcfg(_SC_IMPL)
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if impl&_IMPL_POWER8 != 0 {
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cpu.HWCap2 |= cpu.PPC_FEATURE2_ARCH_2_07
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}
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if impl&_IMPL_POWER9 != 0 {
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cpu.HWCap2 |= cpu.PPC_FEATURE2_ARCH_3_00
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}
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}
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