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Source file src/runtime/mem_darwin.go

Documentation: runtime

  // 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.
  
  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 := mmap(nil, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_PRIVATE, -1, 0)
  	if uintptr(v) < 4096 {
  		return nil
  	}
  	mSysStatInc(sysStat, n)
  	return v
  }
  
  func sysUnused(v unsafe.Pointer, n uintptr) {
  	// Linux's MADV_DONTNEED is like BSD's MADV_FREE.
  	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, reserved *bool) unsafe.Pointer {
  	*reserved = true
  	p := mmap(v, n, _PROT_NONE, _MAP_ANON|_MAP_PRIVATE, -1, 0)
  	if uintptr(p) < 4096 {
  		return nil
  	}
  	return p
  }
  
  const (
  	_ENOMEM = 12
  )
  
  func sysMap(v unsafe.Pointer, n uintptr, reserved bool, sysStat *uint64) {
  	mSysStatInc(sysStat, n)
  	p := mmap(v, n, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_FIXED|_MAP_PRIVATE, -1, 0)
  	if uintptr(p) == _ENOMEM {
  		throw("runtime: out of memory")
  	}
  	if p != v {
  		throw("runtime: cannot map pages in arena address space")
  	}
  }
  

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