Commit 96630673 authored by dt's avatar dt
Browse files

Fix deadlock in .pro file evaluation.

We used to indicate that the cache for a file is up to date by having a
Entry with ent->locker == 0. But we first wake up all threads and only
after all the threads who waited for that parse to complete we set
ent->locker to zero. Thus a different thread could get the impression
that it needs to wait for the parse thread, yet get no wake up.

We need a different flag to indicate that we are actually already done
parsing and the cache can simply be used instead of waiting for a wake
up.

Reviewed-By: ossi
parent b6fda5be
......@@ -3031,7 +3031,7 @@ ProFile *ProFileEvaluator::Private::parsedProFile(const QString &fileName, bool
if (it != m_option->cache->parsed_files.end()) {
ent = &*it;
#ifdef PROPARSER_THREAD_SAFE
if (ent->locker) {
if (ent->locker && !ent->locker->done) {
++ent->locker->waiters;
QThreadPool::globalInstance()->releaseThread();
ent->locker->cond.wait(locker.mutex());
......@@ -3061,6 +3061,7 @@ ProFile *ProFileEvaluator::Private::parsedProFile(const QString &fileName, bool
#ifdef PROPARSER_THREAD_SAFE
locker.relock();
if (ent->locker->waiters) {
ent->locker->done = true;
ent->locker->cond.wakeAll();
} else {
delete ent->locker;
......
......@@ -123,9 +123,10 @@ private:
ProFile *pro;
#ifdef PROPARSER_THREAD_SAFE
struct Locker {
Locker() : waiters(0) {}
Locker() : waiters(0), done(false) {}
QWaitCondition cond;
int waiters;
bool done;
};
Locker *locker;
#endif
......
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