bool
LocalLockTable::downgrade_lock(handle_t& h, const char *path)
{
bool result = false;
string hid = handle_id(h);
lock_entry_t& e = lookup(path);
ScopedMutex lock(&e.entry_lock);
if (e.writer_hid == hid)
{
e.writer_hid = "";
result = true;
}
return result;
}
bool ContextClosest::parseCmdArgs(int argc, char **argv, int skipFirstArgs){
_argc = argc;
_argv = argv;
_skipFirstArgs = skipFirstArgs;
if (_argc < 2) {
setShowHelp(true);
return false;
}
setProgram(_programNames[argv[0]]);
_argsProcessed.resize(_argc - _skipFirstArgs, false);
for (_i=_skipFirstArgs; _i < argc; _i++) {
if (isUsed(_i - _skipFirstArgs)) {
continue;
}
if (strcmp(_argv[_i], "-c") == 0) {
//bypass intersect's use of the -c option, because -c
//means writeCount for intersect, but means columns for map.
if (!ContextBase::handle_c()) return false;
}
else if (strcmp(_argv[_i], "-d") == 0) {
if (!handle_d()) return false;
}
else if (strcmp(_argv[_i], "-D") == 0) {
if (!handle_D()) return false;
}
else if (strcmp(_argv[_i], "-io") == 0) {
if (!handle_io()) return false;
}
else if (strcmp(_argv[_i], "-iu") == 0) {
if (!handle_iu()) return false;
}
else if (strcmp(_argv[_i], "-id") == 0) {
if (!handle_id()) return false;
}
else if (strcmp(_argv[_i], "-N") == 0) {
if (!handle_N()) return false;
}
else if (strcmp(_argv[_i], "-t") == 0) {
if (!handle_t()) return false;
}
else if (strcmp(_argv[_i], "-mdb") == 0) {
if (!handle_mdb()) return false;
}
}
return ContextIntersect::parseCmdArgs(argc, argv, _skipFirstArgs);
}
bool
LocalLockTable::read_lock(handle_t& h, const char *path, bool wait)
{
lock_entry_t& e = lookup(path);
e.entry_lock.lock();
while (!e.writer_hid.empty())
{
e.entry_lock.unlock();
e.entry_cv.wait();
e.entry_lock.lock();
e.reader_hid.push_front(handle_id(h));
}
e.entry_lock.unlock();
return true;
}
bool
LocalLockTable::is_read_locked(handle_t& h, const char *path)
{
bool result = false;
#if 1
string hid = handle_id(h);
lock_entry_t& e = lookup(path);
ScopedMutex lock(&e.entry_lock);
for (string_list_t::iterator it = e.reader_hid.begin(); !result && it != e.reader_hid.end(); it++)
{
if (*it == hid)
{
result = true;
}
}
#endif
return result;
}
bool
LocalLockTable::unlock(handle_t& h, const char *path)
{
bool result = false;
string hid = handle_id(h);
lock_entry_t& e = lookup(path);
ScopedMutex lock(&e.entry_lock);
if (e.writer_hid == hid)
{
e.writer_hid = "";
result = true;
}
else
{
e.reader_hid.remove(hid);
result = !(e.writer_hid.empty());
}
return result;
}
bool
LocalLockTable::upgrade_lock(handle_t& h, const char *path)
{
lock_entry_t& e = lookup(path);
string hid = handle_id(h);
e.entry_lock.lock();
while (!e.writer_hid.empty())
{
e.entry_lock.unlock();
e.entry_cv.wait();
e.entry_lock.lock();
if (e.writer_hid.empty())
{
e.writer_hid = hid;
e.reader_hid.remove(hid);
}
}
e.entry_lock.unlock();
return true;
}
bool
LocalLockTable::write_lock(handle_t& h, const char *path, bool wait)
{
bool result = false;
lock_entry_t& e = lookup(path);
string hid = handle_id(h);
e.entry_lock.lock();
while (!e.writer_hid.empty() && e.writer_hid != hid)
{
e.entry_lock.unlock();
e.entry_cv.wait();
e.entry_lock.lock();
if (e.writer_hid.empty())
{
e.writer_hid = hid;
result = true;
}
}
e.entry_lock.unlock();
return result;
}
