// Copyright 2010 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 darwin dragonfly freebsd nacl netbsd openbsd solaris
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package runtime
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import (
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"unsafe"
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)
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// Don't split the stack as this function may be invoked without a valid G,
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// which prevents us from allocating more stack.
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//go:nosplit
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func sysAlloc(n uintptr, sysStat *uint64) unsafe.Pointer {
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v, err := mmap(nil, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_PRIVATE, -1, 0)
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if err != 0 {
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return nil
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}
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mSysStatInc(sysStat, n)
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return v
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}
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func sysUnused(v unsafe.Pointer, n uintptr) {
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madvise(v, n, _MADV_FREE)
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}
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func sysUsed(v unsafe.Pointer, n uintptr) {
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}
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// Don't split the stack as this function may be invoked without a valid G,
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// which prevents us from allocating more stack.
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//go:nosplit
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func sysFree(v unsafe.Pointer, n uintptr, sysStat *uint64) {
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mSysStatDec(sysStat, n)
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munmap(v, n)
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}
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func sysFault(v unsafe.Pointer, n uintptr) {
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mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE|_MAP_FIXED, -1, 0)
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}
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func sysReserve(v unsafe.Pointer, n uintptr) unsafe.Pointer {
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flags := int32(_MAP_ANON | _MAP_PRIVATE)
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if raceenabled && GOOS == "darwin" {
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// Currently the race detector expects memory to live within a certain
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// range, and on Darwin 10.10 mmap is prone to ignoring hints, moreso
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// than later versions and other BSDs (#26475). So, even though it's
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// potentially dangerous to MAP_FIXED, we do it in the race detection
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// case because it'll help maintain the race detector's invariants.
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//
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// TODO(mknyszek): Drop this once support for Darwin 10.10 is dropped,
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// and reconsider this when #24133 is addressed.
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flags |= _MAP_FIXED
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}
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p, err := mmap(v, n, _PROT_NONE, flags, -1, 0)
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if err != 0 {
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return nil
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}
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return p
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}
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const _sunosEAGAIN = 11
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const _ENOMEM = 12
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func sysMap(v unsafe.Pointer, n uintptr, sysStat *uint64) {
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mSysStatInc(sysStat, n)
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p, err := mmap(v, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_FIXED|_MAP_PRIVATE, -1, 0)
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if err == _ENOMEM || (GOOS == "solaris" && err == _sunosEAGAIN) {
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throw("runtime: out of memory")
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}
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if p != v || err != 0 {
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throw("runtime: cannot map pages in arena address space")
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}
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}
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