157 lines
4.0 KiB
C++
157 lines
4.0 KiB
C++
/*
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Copyright (C) 2004-2008 Grame
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "JackError.h"
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#include "JackShmMem.h"
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#include <stdio.h>
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namespace Jack
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{
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static unsigned int fSegmentNum = 0;
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static jack_shm_info_t gInfo;
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JackShmMem::JackShmMem()
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{
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JackShmMemAble::Init();
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LockMemory();
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}
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JackShmMem::~JackShmMem()
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{
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UnlockMemory();
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}
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void JackShmMemAble::Init()
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{
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fInfo.index = gInfo.index;
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fInfo.ptr.attached_at = gInfo.ptr.attached_at;
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fInfo.size = gInfo.size;
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}
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void* JackShmMem::operator new(size_t size, void* memory)
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{
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jack_log("JackShmMem::new placement size = %ld", size);
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return memory;
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}
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void* JackShmMem::operator new(size_t size)
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{
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jack_shm_info_t info;
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JackShmMem* obj;
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char name[64];
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snprintf(name, sizeof(name), "/jack_shared%d", fSegmentNum++);
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if (jack_shmalloc(name, size, &info)) {
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jack_error("Cannot create shared memory segment of size = %d", size, strerror(errno));
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goto error;
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}
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if (jack_attach_shm(&info)) {
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jack_error("Cannot attach shared memory segment name = %s err = %s", name, strerror(errno));
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jack_destroy_shm(&info);
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goto error;
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}
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obj = (JackShmMem*)jack_shm_addr(&info);
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// It is unsafe to set object fields directly (may be overwritten during object initialization),
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// so use an intermediate global data
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gInfo.index = info.index;
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gInfo.size = size;
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gInfo.ptr.attached_at = info.ptr.attached_at;
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jack_log("JackShmMem::new index = %ld attached = %x size = %ld ", info.index, info.ptr.attached_at, size);
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return obj;
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error:
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jack_error("JackShmMem::new bad alloc", size);
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throw std::bad_alloc();
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}
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void JackShmMem::operator delete(void* p, size_t size)
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{
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jack_shm_info_t info;
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JackShmMem* obj = (JackShmMem*)p;
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info.index = obj->fInfo.index;
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info.ptr.attached_at = obj->fInfo.ptr.attached_at;
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jack_log("JackShmMem::delete size = %ld index = %ld", size, info.index);
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jack_release_shm(&info);
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jack_destroy_shm(&info);
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}
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void JackShmMem::operator delete(void* obj)
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{
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if (obj) {
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JackShmMem::operator delete(obj, 0);
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}
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}
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void LockMemoryImp(void* ptr, size_t size)
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{
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if (CHECK_MLOCK((char*)ptr, size)) {
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jack_log("Succeeded in locking %u byte memory area", size);
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} else {
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jack_error("Cannot lock down %u byte memory area (%s)", size, strerror(errno));
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}
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}
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void InitLockMemoryImp(void* ptr, size_t size)
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{
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if (CHECK_MLOCK((char*)ptr, size)) {
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memset(ptr, 0, size);
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jack_log("Succeeded in locking %u byte memory area", size);
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} else {
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jack_error("Cannot lock down %u byte memory area (%s)", size, strerror(errno));
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}
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}
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void UnlockMemoryImp(void* ptr, size_t size)
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{
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if (CHECK_MUNLOCK((char*)ptr, size)) {
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jack_log("Succeeded in unlocking %u byte memory area", size);
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} else {
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jack_error("Cannot unlock down %u byte memory area (%s)", size, strerror(errno));
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}
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}
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void LockAllMemory()
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{
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if (CHECK_MLOCKALL()) {
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jack_log("Succeeded in locking all memory");
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} else {
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jack_error("Cannot lock all memory (%s)", strerror(errno));
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}
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}
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void UnlockAllMemory()
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{
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if (CHECK_MUNLOCKALL()) {
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jack_log("Succeeded in unlocking all memory");
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} else {
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jack_error("Cannot unlock all memory (%s)", strerror(errno));
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}
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}
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} // end of namespace
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