* Copyright 2002, Marcus Overhagen. All rights reserved.
* Copyright 2009, Axel Dörfler, axeld@pinc-software.de.
* Distributed under the terms of the MIT License.
*/
#include "BufferManager.h"
#include <Autolock.h>
#include "MediaDebug.h"
#include "SharedBufferList.h"
BufferManager::BufferManager()
:
fSharedBufferList(NULL),
fSharedBufferListArea(-1),
fNextBufferID(1),
fLocker("buffer manager locker")
{
fSharedBufferListArea
= BPrivate::SharedBufferList::Create(&fSharedBufferList);
}
BufferManager::~BufferManager()
{
fSharedBufferList->Put();
}
area_id
BufferManager::SharedBufferListArea()
{
return fSharedBufferListArea;
}
status_t
BufferManager::RegisterBuffer(team_id team, media_buffer_id bufferID,
size_t* _size, int32* _flags, size_t* _offset, area_id* _area)
{
BAutolock lock(fLocker);
TRACE("RegisterBuffer team = %" B_PRId32 ", bufferid = %" B_PRId32 "\n",
team, bufferID);
buffer_info* info;
if (!fBufferInfoMap.Get(bufferID, info)) {
ERROR("failed to register buffer! team = %" B_PRId32 ", bufferid = %"
B_PRId32 "\n", team, bufferID);
return B_ERROR;
}
info->teams.insert(team);
*_area = info->area;
*_offset = info->offset;
*_size = info->size,
*_flags = info->flags;
return B_OK;
}
status_t
BufferManager::RegisterBuffer(team_id team, size_t size, int32 flags,
size_t offset, area_id area, media_buffer_id* _bufferID)
{
BAutolock lock(fLocker);
TRACE("RegisterBuffer team = %" B_PRId32 ", area = %"
B_PRId32 ", offset = %" B_PRIuSIZE ", size = %" B_PRIuSIZE "\n",
team, area, offset, size);
area_id clonedArea = _CloneArea(area);
if (clonedArea < 0) {
ERROR("RegisterBuffer: failed to clone buffer! error = %#" B_PRIx32
", team = %" B_PRId32 ", area = %" B_PRId32 ", offset = %"
B_PRIuSIZE ", size = %" B_PRIuSIZE "\n", clonedArea, team,
area, offset, size);
return clonedArea;
}
buffer_info info;
info.id = fNextBufferID++;
info.area = clonedArea;
info.offset = offset;
info.size = size;
info.flags = flags;
try {
info.teams.insert(team);
if (fBufferInfoMap.Put(info.id, info) != B_OK)
throw std::bad_alloc();
} catch (std::bad_alloc& exception) {
_ReleaseClonedArea(clonedArea);
return B_NO_MEMORY;
}
TRACE("RegisterBuffer: done, bufferID = %" B_PRId32 "\n", info.id);
*_bufferID = info.id;
return B_OK;
}
status_t
BufferManager::UnregisterBuffer(team_id team, media_buffer_id bufferID)
{
BAutolock lock(fLocker);
TRACE("UnregisterBuffer: team = %" B_PRId32 ", bufferID = %" B_PRId32 "\n",
team, bufferID);
buffer_info* info;
if (!fBufferInfoMap.Get(bufferID, info)) {
ERROR("UnregisterBuffer: failed to unregister buffer! team = %"
B_PRId32 ", bufferID = %" B_PRId32 "\n", team, bufferID);
return B_ERROR;
}
if (info->teams.find(team) == info->teams.end()) {
ERROR("UnregisterBuffer: failed to find team = %" B_PRId32 " belonging"
" to bufferID = %" B_PRId32 "\n", team, bufferID);
return B_ERROR;
}
info->teams.erase(team);
TRACE("UnregisterBuffer: team = %" B_PRId32 " removed from bufferID = %"
B_PRId32 "\n", team, bufferID);
if (info->teams.empty()) {
_ReleaseClonedArea(info->area);
fBufferInfoMap.Remove(bufferID);
TRACE("UnregisterBuffer: bufferID = %" B_PRId32 " removed\n", bufferID);
}
return B_OK;
}
void
BufferManager::CleanupTeam(team_id team)
{
BAutolock lock(fLocker);
TRACE("BufferManager::CleanupTeam: team %" B_PRId32 "\n", team);
BufferInfoMap::Iterator iterator = fBufferInfoMap.GetIterator();
while (iterator.HasNext()) {
BufferInfoMap::Entry entry = iterator.Next();
entry.value.teams.erase(team);
if (entry.value.teams.empty()) {
PRINT(1, "BufferManager::CleanupTeam: removing buffer id %"
B_PRId32 " that has no teams\n", entry.key.GetHashCode());
_ReleaseClonedArea(entry.value.area);
fBufferInfoMap.Remove(iterator);
}
}
}
void
BufferManager::Dump()
{
BAutolock lock(fLocker);
printf("\n");
printf("BufferManager: list of buffers follows:\n");
BufferInfoMap::Iterator iterator = fBufferInfoMap.GetIterator();
while (iterator.HasNext()) {
buffer_info info = iterator.Next().value;
printf(" buffer-id %" B_PRId32 ", area-id %" B_PRId32 ", offset %ld, "
"size %ld, flags %#08" B_PRIx32 "\n", info.id, info.area,
info.offset, info.size, info.flags);
printf(" assigned teams: ");
std::set<team_id>::iterator teamIterator = info.teams.begin();
for (; teamIterator != info.teams.end(); teamIterator++) {
printf("%" B_PRId32 ", ", *teamIterator);
}
printf("\n");
}
printf("BufferManager: list end\n");
}
area_id
BufferManager::_CloneArea(area_id area)
{
{
clone_info* info;
if (fCloneInfoMap.Get(area, info)) {
TRACE("BufferManager::_CloneArea() area %" B_PRId32 " has already"
" been cloned (id %" B_PRId32 ")\n", area, info->clone);
info->ref_count++;
return info->clone;
}
}
void* address;
area_id clonedArea = clone_area("media_server cloned buffer", &address,
B_ANY_ADDRESS, B_READ_AREA | B_WRITE_AREA | B_CLONEABLE_AREA, area);
TRACE("BufferManager::_CloneArea() cloned area %" B_PRId32 ", clone id %"
B_PRId32 "\n", area, clonedArea);
if (clonedArea < 0)
return clonedArea;
clone_info info;
info.clone = clonedArea;
info.ref_count = 1;
if (fCloneInfoMap.Put(area, info) == B_OK) {
if (fSourceInfoMap.Put(clonedArea, area) == B_OK)
return clonedArea;
fCloneInfoMap.Remove(area);
}
delete_area(clonedArea);
return B_NO_MEMORY;
}
void
BufferManager::_ReleaseClonedArea(area_id clone)
{
area_id source = fSourceInfoMap.Get(clone);
clone_info* info;
if (!fCloneInfoMap.Get(source, info)) {
ERROR("BufferManager::_ReleaseClonedArea(): could not find clone info "
"for id %" B_PRId32 " (clone %" B_PRId32 ")\n", source, clone);
return;
}
if (--info->ref_count == 0) {
TRACE("BufferManager::_ReleaseClonedArea(): delete cloned area %"
B_PRId32 " (source %" B_PRId32 ")\n", clone, source);
fSourceInfoMap.Remove(clone);
fCloneInfoMap.Remove(source);
delete_area(clone);
} else {
TRACE("BufferManager::_ReleaseClonedArea(): released cloned area %"
B_PRId32 " (source %" B_PRId32 ")\n", clone, source);
}
}
