mirror of
https://github.com/golang/go.git
synced 2025-12-08 06:10:04 +00:00
6fcab648af
This change disables the test TestArenaCollision on Darwin in race mode to deal with the fact that Darwin 10.10 must use MAP_FIXED in race mode to ensure we retain our heap in a particular portion of the address space which the race detector needs. The test specifically checks to make sure a manually mapped region's space isn't re-used, which is definitely possible with MAP_FIXED because it replaces whatever mapping already exists at a given address. This change then also makes it so that MAP_FIXED is only used in race mode and on Darwin, not all BSDs, because using MAP_FIXED breaks this test for FreeBSD in addition to Darwin. Updates #26475. Fixes #29340. Change-Id: I1c59349408ccd7eeb30c4bf2593f48316b23ab2f Reviewed-on: https://go-review.googlesource.com/c/155097 Run-TryBot: Michael Knyszek <mknyszek@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
77 lines
2.2 KiB
Go
77 lines
2.2 KiB
Go
// Copyright 2010 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.
|
|
|
|
// +build darwin dragonfly freebsd nacl netbsd openbsd solaris
|
|
|
|
package runtime
|
|
|
|
import (
|
|
"unsafe"
|
|
)
|
|
|
|
// Don't split the stack as this function may be invoked without a valid G,
|
|
// which prevents us from allocating more stack.
|
|
//go:nosplit
|
|
func sysAlloc(n uintptr, sysStat *uint64) unsafe.Pointer {
|
|
v, err := mmap(nil, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_PRIVATE, -1, 0)
|
|
if err != 0 {
|
|
return nil
|
|
}
|
|
mSysStatInc(sysStat, n)
|
|
return v
|
|
}
|
|
|
|
func sysUnused(v unsafe.Pointer, n uintptr) {
|
|
madvise(v, n, _MADV_FREE)
|
|
}
|
|
|
|
func sysUsed(v unsafe.Pointer, n uintptr) {
|
|
}
|
|
|
|
// Don't split the stack as this function may be invoked without a valid G,
|
|
// which prevents us from allocating more stack.
|
|
//go:nosplit
|
|
func sysFree(v unsafe.Pointer, n uintptr, sysStat *uint64) {
|
|
mSysStatDec(sysStat, n)
|
|
munmap(v, n)
|
|
}
|
|
|
|
func sysFault(v unsafe.Pointer, n uintptr) {
|
|
mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE|_MAP_FIXED, -1, 0)
|
|
}
|
|
|
|
func sysReserve(v unsafe.Pointer, n uintptr) unsafe.Pointer {
|
|
flags := int32(_MAP_ANON | _MAP_PRIVATE)
|
|
if raceenabled && GOOS == "darwin" {
|
|
// Currently the race detector expects memory to live within a certain
|
|
// range, and on Darwin 10.10 mmap is prone to ignoring hints, moreso
|
|
// than later versions and other BSDs (#26475). So, even though it's
|
|
// potentially dangerous to MAP_FIXED, we do it in the race detection
|
|
// case because it'll help maintain the race detector's invariants.
|
|
//
|
|
// TODO(mknyszek): Drop this once support for Darwin 10.10 is dropped,
|
|
// and reconsider this when #24133 is addressed.
|
|
flags |= _MAP_FIXED
|
|
}
|
|
p, err := mmap(v, n, _PROT_NONE, flags, -1, 0)
|
|
if err != 0 {
|
|
return nil
|
|
}
|
|
return p
|
|
}
|
|
|
|
const _sunosEAGAIN = 11
|
|
const _ENOMEM = 12
|
|
|
|
func sysMap(v unsafe.Pointer, n uintptr, sysStat *uint64) {
|
|
mSysStatInc(sysStat, n)
|
|
|
|
p, err := mmap(v, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_FIXED|_MAP_PRIVATE, -1, 0)
|
|
if err == _ENOMEM || (GOOS == "solaris" && err == _sunosEAGAIN) {
|
|
throw("runtime: out of memory")
|
|
}
|
|
if p != v || err != 0 {
|
|
throw("runtime: cannot map pages in arena address space")
|
|
}
|
|
}
|