JackShmMem.cpp
/*
Copyright (C) 2004-2008 Grame
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "JackError.h"
#include "JackShmMem.h"
#include <stdio.h>
namespace Jack
{
static unsigned int fSegmentNum = 0;
static jack_shm_info_t gInfo;
size_t JackMem::gSize = 0;
JackShmMem::JackShmMem()
{
JackShmMemAble::Init();
LockMemory();
}
JackShmMem::~JackShmMem()
{
UnlockMemory();
}
void JackShmMemAble::Init()
{
fInfo.index = gInfo.index;
fInfo.ptr.attached_at = gInfo.ptr.attached_at;
fInfo.size = gInfo.size;
}
void* JackShmMem::operator new(size_t size, void* memory)
{
jack_log("JackShmMem::new placement size = %ld", size);
return memory;
}
void* JackShmMem::operator new(size_t size)
{
jack_shm_info_t info;
JackShmMem* obj;
char name[64];
snprintf(name, sizeof(name), "/jack_shared%d", fSegmentNum++);
if (jack_shmalloc(name, size, &info)) {
jack_error("Cannot create shared memory segment of size = %d", size, strerror(errno));
goto error;
}
if (jack_attach_shm(&info)) {
jack_error("Cannot attach shared memory segment name = %s err = %s", name, strerror(errno));
jack_destroy_shm(&info);
goto error;
}
obj = (JackShmMem*)jack_shm_addr(&info);
// It is unsafe to set object fields directly (may be overwritten during object initialization),
// so use an intermediate global data
gInfo.index = info.index;
gInfo.size = size;
gInfo.ptr.attached_at = info.ptr.attached_at;
jack_log("JackShmMem::new index = %ld attached = %x size = %ld ", info.index, info.ptr.attached_at, size);
return obj;
error:
jack_error("JackShmMem::new bad alloc", size);
throw std::bad_alloc();
}
void JackShmMem::operator delete(void* p, size_t size)
{
jack_shm_info_t info;
JackShmMem* obj = (JackShmMem*)p;
info.index = obj->fInfo.index;
info.ptr.attached_at = obj->fInfo.ptr.attached_at;
jack_log("JackShmMem::delete size = %ld index = %ld", size, info.index);
jack_release_shm(&info);
jack_destroy_shm(&info);
}
void JackShmMem::operator delete(void* obj)
{
if (obj) {
JackShmMem::operator delete(obj, 0);
}
}
void LockMemoryImp(void* ptr, size_t size)
{
if (CHECK_MLOCK((char*)ptr, size)) {
jack_log("Succeeded in locking %u byte memory area", size);
} else {
jack_error("Cannot lock down %u byte memory area (%s)", size, strerror(errno));
}
}
void InitLockMemoryImp(void* ptr, size_t size)
{
if (CHECK_MLOCK((char*)ptr, size)) {
memset(ptr, 0, size);
jack_log("Succeeded in locking %u byte memory area", size);
} else {
jack_error("Cannot lock down %u byte memory area (%s)", size, strerror(errno));
}
}
void UnlockMemoryImp(void* ptr, size_t size)
{
if (CHECK_MUNLOCK((char*)ptr, size)) {
jack_log("Succeeded in unlocking %u byte memory area", size);
} else {
jack_error("Cannot unlock down %u byte memory area (%s)", size, strerror(errno));
}
}
void LockAllMemory()
{
if (CHECK_MLOCKALL()) {
jack_log("Succeeded in locking all memory");
} else {
jack_error("Cannot lock all memory (%s)", strerror(errno));
}
}
void UnlockAllMemory()
{
if (CHECK_MUNLOCKALL()) {
jack_log("Succeeded in unlocking all memory");
} else {
jack_error("Cannot unlock all memory (%s)", strerror(errno));
}
}
} // end of namespace
_jack_shm_info
Definition: shm.h:170
Jack
Definition: JackAC3Encoder.cpp:30
jack_error
SERVER_EXPORT void jack_error(const char *fmt,...)
Definition: JackError.cpp:92
jack_log
SERVER_EXPORT void jack_log(const char *fmt,...)
Definition: JackError.cpp:108