github.com/zxy12/go_duplicate_112_new@v0.0.0-20200807091221-747231827200/src/runtime/mem_aix.go (about) 1 // Copyright 2018 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package runtime 6 7 import ( 8 "unsafe" 9 ) 10 11 // Don't split the stack as this method may be invoked without a valid G, which 12 // prevents us from allocating more stack. 13 //go:nosplit 14 func sysAlloc(n uintptr, sysStat *uint64) unsafe.Pointer { 15 p, err := mmap(nil, n, _PROT_READ|_PROT_WRITE, _MAP_ANONYMOUS|_MAP_PRIVATE, -1, 0) 16 if err != 0 { 17 if err == _EACCES { 18 print("runtime: mmap: access denied\n") 19 exit(2) 20 } 21 if err == _EAGAIN { 22 print("runtime: mmap: too much locked memory (check 'ulimit -l').\n") 23 exit(2) 24 } 25 //println("sysAlloc failed: ", err) 26 return nil 27 } 28 mSysStatInc(sysStat, n) 29 return p 30 } 31 32 func sysUnused(v unsafe.Pointer, n uintptr) { 33 madvise(v, n, _MADV_DONTNEED) 34 } 35 36 func sysUsed(v unsafe.Pointer, n uintptr) { 37 } 38 39 // Don't split the stack as this function may be invoked without a valid G, 40 // which prevents us from allocating more stack. 41 //go:nosplit 42 func sysFree(v unsafe.Pointer, n uintptr, sysStat *uint64) { 43 mSysStatDec(sysStat, n) 44 munmap(v, n) 45 46 } 47 48 func sysFault(v unsafe.Pointer, n uintptr) { 49 mmap(v, n, _PROT_NONE, _MAP_ANONYMOUS|_MAP_PRIVATE|_MAP_FIXED, -1, 0) 50 } 51 52 func sysReserve(v unsafe.Pointer, n uintptr) unsafe.Pointer { 53 p, err := mmap(v, n, _PROT_NONE, _MAP_ANONYMOUS|_MAP_PRIVATE, -1, 0) 54 if err != 0 { 55 return nil 56 } 57 return p 58 } 59 60 func sysMap(v unsafe.Pointer, n uintptr, sysStat *uint64) { 61 mSysStatInc(sysStat, n) 62 63 // AIX does not allow mapping a range that is already mapped. 64 // So always unmap first even if it is already unmapped. 65 munmap(v, n) 66 p, err := mmap(v, n, _PROT_READ|_PROT_WRITE, _MAP_ANONYMOUS|_MAP_FIXED|_MAP_PRIVATE, -1, 0) 67 68 if err == _ENOMEM { 69 throw("runtime: out of memory") 70 } 71 if p != v || err != 0 { 72 throw("runtime: cannot map pages in arena address space") 73 } 74 }