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Fix deadlock in .pro file evaluation.

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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
This commit is contained in:
dt
2010-03-17 16:19:55 +01:00
parent b6fda5be84
commit 9663067357
2 changed files with 4 additions and 2 deletions
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3
src/shared/proparser/profileevaluator.cpp
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@@ -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;