void dmtcp::VirtualPidTable::readPidMapsFromFile()
{
dmtcp::string mapFile;
size_t numMaps;
mapFile = jalib::Filesystem::ResolveSymlink(
"/proc/self/fd/" + jalib::XToString(PROTECTED_PIDMAP_FD));
JASSERT(mapFile.length() > 0) (mapFile);
JTRACE("Read PidMaps from file") (mapFile);
Util::lockFile(PROTECTED_PIDMAP_FD);
_do_lock_tbl();
jalib::JBinarySerializeReaderRaw maprd(mapFile, PROTECTED_PIDMAP_FD);
maprd.rewind();
while (!maprd.isEOF()) {
maprd.serializeMap(_pidMapTable);
}
_do_unlock_tbl();
Util::unlockFile(PROTECTED_PIDMAP_FD);
printPidMaps();
close(PROTECTED_PIDMAP_FD);
unlink(mapFile.c_str());
}
pid_t dmtcp::VirtualPidTable::getNewVirtualTid()
{
pid_t tid = -1;
if (_numTids == MAX_VIRTUAL_TID) {
refresh();
}
JASSERT(_numTids < MAX_VIRTUAL_TID)
.Text("Exceeded maximum number of threads allowed");
_do_lock_tbl();
int count = 0;
while (1) {
tid = getpid() + _nextVirtualTid++;
if (_nextVirtualTid >= MAX_VIRTUAL_TID) {
_nextVirtualTid = INITIAL_VIRTUAL_TID;
}
pid_iterator i = _pidMapTable.find(tid);
if (i == _pidMapTable.end()) {
break;
}
if (++count == MAX_VIRTUAL_TID) {
break;
}
}
_do_unlock_tbl();
JASSERT(tid != -1) .Text("Not Reachable");
return tid;
}
void dmtcp::ProcessInfo::endPthreadJoin(pthread_t thread)
{
_do_lock_tbl();
JASSERT(pthread_equal(_pthreadJoinId[thread], pthread_self()));
_pthreadJoinId.erase(thread);
_do_unlock_tbl();
}
void dmtcp::ProcessInfo::eraseChild(pid_t virtualPid)
{
_do_lock_tbl();
iterator i = _childTable.find(virtualPid);
if (i != _childTable.end())
_childTable.erase(virtualPid);
_do_unlock_tbl();
}
void dmtcp::ProcessInfo::clearPthreadJoinState(pthread_t thread)
{
_do_lock_tbl();
if (_pthreadJoinId.find(thread) != _pthreadJoinId.end()) {
_pthreadJoinId.erase(thread);
}
_do_unlock_tbl();
}
void dmtcp::ProcessInfo::insertTid( pid_t tid )
{
eraseTid( tid );
_do_lock_tbl();
_tidVector.push_back ( tid );
_do_unlock_tbl();
return;
}
void dmtcp::ProcessInfo::endPthreadJoin(pthread_t thread)
{
_do_lock_tbl();
if (_pthreadJoinId.find(thread) != _pthreadJoinId.end() &&
pthread_equal(_pthreadJoinId[thread], pthread_self())) {
_pthreadJoinId.erase(thread);
}
_do_unlock_tbl();
}
dmtcp::vector< pid_t > dmtcp::VirtualPidTable::getPidVector( )
{
dmtcp::vector< pid_t > pidVec;
_do_lock_tbl();
for ( pid_iterator i = _pidMapTable.begin(); i != _pidMapTable.end(); ++i )
pidVec.push_back ( i->first );
_do_unlock_tbl();
return pidVec;
}
dmtcp::VirtualPidTable::VirtualPidTable()
{
_do_lock_tbl();
_pidMapTable.clear();
//_pidMapTable[getpid()] = _real_getpid();
//_pidMapTable[getppid()] = _real_getppid();
_do_unlock_tbl();
}
bool dmtcp::VirtualPidTable::pidExists( pid_t pid )
{
bool retVal = false;
_do_lock_tbl();
pid_iterator j = _pidMapTable.find ( pid );
if ( j != _pidMapTable.end() )
retVal = true;
_do_unlock_tbl();
return retVal;
}
void dmtcp::VirtualPidTable::postRestart()
{
/*
* PROTECTED_PIDMAP_FD corresponds to the file containg computation wide
* virtualPid -> realPid map to avoid pid/tid collisions.
*/
_do_lock_tbl();
_pidMapTable.clear();
_pidMapTable[getpid()] = _real_getpid();
_do_unlock_tbl();
}
bool dmtcp::ProcessInfo::beginPthreadJoin(pthread_t thread)
{
bool res = false;
_do_lock_tbl();
dmtcp::map<pthread_t, pthread_t>::iterator i = _pthreadJoinId.find(thread);
if (i == _pthreadJoinId.end()) {
_pthreadJoinId[thread] = pthread_self();
res = true;
}
_do_unlock_tbl();
return res;
}
void dmtcp::ProcessInfo::postExec( )
{
/// FIXME
JTRACE("Post-Exec. Emptying tidVector");
_do_lock_tbl();
_tidVector.clear();
_procname = jalib::Filesystem::GetProgramName();
_upid = UniquePid::ThisProcess();
_uppid = UniquePid::ParentProcess();
_do_unlock_tbl();
}
void dmtcp::ProcessInfo::insertChild(pid_t pid, dmtcp::UniquePid uniquePid)
{
_do_lock_tbl();
iterator i = _childTable.find(pid);
JWARNING(i == _childTable.end()) (pid) (uniquePid) (i->second)
.Text("child pid already exists!");
_childTable[pid] = uniquePid;
_do_unlock_tbl();
JTRACE("Creating new virtualPid -> realPid mapping.") (pid) (uniquePid);
}
bool dmtcp::ProcessInfo::isChild(const UniquePid& upid)
{
bool res = false;
_do_lock_tbl();
for (iterator i = _childTable.begin(); i != _childTable.end(); i++) {
if (i->second == upid) {
res = true;
break;
}
}
_do_unlock_tbl();
return res;
}
dmtcp::ProcessInfo::ProcessInfo()
{
_do_lock_tbl();
_pid = -1;
_ppid = -1;
_gid = -1;
_sid = -1;
_isRootOfProcessTree = false;
_childTable.clear();
_tidVector.clear();
_pthreadJoinId.clear();
_do_unlock_tbl();
}
bool dmtcp::VirtualPidTable::realPidExists( pid_t pid )
{
bool retval = false;
_do_lock_tbl();
for (pid_iterator i = _pidMapTable.begin(); i != _pidMapTable.end(); ++i) {
if (i->second == pid) {
retval = true;
break;
}
}
_do_unlock_tbl();
return retval;
}
pid_t dmtcp::VirtualPidTable::virtualToReal(pid_t virtualPid)
{
pid_t retVal = 0;
if (virtualPid == -1 || virtualPid == 0) {
return virtualPid;
}
/* This code is called from MTCP while the checkpoint thread is holding
the JASSERT log lock. Therefore, don't call JTRACE/JASSERT/JINFO/etc. in
this function. */
_do_lock_tbl();
pid_iterator i = _pidMapTable.find(virtualPid < -1 ? abs(virtualPid)
: virtualPid);
if (i == _pidMapTable.end()) {
_do_unlock_tbl();
return virtualPid;
}
retVal = virtualPid < -1 ? (-i->second) : i->second;
_do_unlock_tbl();
return retVal;
}
void dmtcp::ProcessInfo::eraseTid( pid_t tid )
{
_do_lock_tbl();
dmtcp::vector< pid_t >::iterator iter = _tidVector.begin();
while ( iter != _tidVector.end() ) {
if ( *iter == tid ) {
_tidVector.erase( iter );
break;
}
else
++iter;
}
_do_unlock_tbl();
return;
}
dmtcp::ProcessInfo::ProcessInfo()
{
_do_lock_tbl();
_pid = -1;
_ppid = -1;
_gid = -1;
_sid = -1;
_isRootOfProcessTree = false;
_noCoordinator = false;
_childTable.clear();
_tidVector.clear();
_pthreadJoinId.clear();
_procSelfExe = jalib::Filesystem::ResolveSymlink("/proc/self/exe");
_do_unlock_tbl();
}
void dmtcp::VirtualPidTable::refresh()
{
pid_t pid = getpid();
pid_iterator i;
pid_iterator next;
pid_t _real_pid = _real_getpid();
_do_lock_tbl();
for (i = _pidMapTable.begin(), next = i; i != _pidMapTable.end(); i = next) {
next++;
if (i->second > pid && i->second <= pid + MAX_VIRTUAL_TID
&& _real_tgkill(_real_pid, i->second, 0) == -1) {
_pidMapTable.erase(i);
}
}
_do_unlock_tbl();
printPidMaps();
}
void dmtcp::VirtualPidTable::writePidMapsToFile()
{
//size_t numMaps = 0;
dmtcp::string mapFile;
mapFile = jalib::Filesystem::ResolveSymlink(
"/proc/self/fd/" + jalib::XToString(PROTECTED_PIDMAP_FD));
JASSERT (mapFile.length() > 0) (mapFile);
JTRACE ("Write PidMaps to file") (mapFile);
// Lock fileset before any operations
Util::lockFile(PROTECTED_PIDMAP_FD);
_do_lock_tbl();
jalib::JBinarySerializeWriterRaw mapwr(mapFile, PROTECTED_PIDMAP_FD);
mapwr.serializeMap(_pidMapTable);
_do_unlock_tbl();
Util::unlockFile(PROTECTED_PIDMAP_FD);
}
void dmtcp::VirtualPidTable::erase( pid_t virtualPid )
{
_do_lock_tbl();
_pidMapTable.erase( virtualPid );
_do_unlock_tbl();
}
void dmtcp::VirtualPidTable::updateMapping( pid_t virtualPid, pid_t realPid )
{
_do_lock_tbl();
_pidMapTable[virtualPid] = realPid;
_do_unlock_tbl();
}