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Port from implicit to explicit atomic integer operations

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The old code used the implicit conversions from QAtomicInteger<T> to T
and vice versa. The semantics of these differ from the ones std::atomic
uses, so we're going to deprecate these, like we did for load() and
store(), too.

This patch fixex some users of these APIs before we deprecate them.

Change-Id: I4877276581757cd57e042efea8296fe535a493d1
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Marc Mutz 2019-06-26 07:56:49 +02:00
parent e36e32c213
commit 5220b40edd
5 changed files with 11 additions and 9 deletions
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2
src/3rdparty/forkfd/forkfd.c vendored
View File

@ -267,7 +267,7 @@ static int tryReaping(pid_t pid, struct pipe_payload *payload)
static void freeInfo(Header *header, ProcessInfo *entry)
{
entry->deathPipe = -1;
entry->pid = 0;
ffd_atomic_store(&entry->pid, 0, FFD_ATOMIC_RELEASE);
(void)ffd_atomic_add_fetch(&header->busyCount, -1, FFD_ATOMIC_RELEASE);
assert(header->busyCount >= 0);

10
src/corelib/global/qrandom.cpp
View File

@ -359,17 +359,17 @@ Q_NEVER_INLINE void QRandomGenerator::SystemGenerator::generate(quint32 *begin,
quint32 *buffer = begin;
qsizetype count = end - begin;
if (Q_UNLIKELY(uint(qt_randomdevice_control) & SetRandomData)) {
uint value = uint(qt_randomdevice_control) & RandomDataMask;
if (Q_UNLIKELY(uint(qt_randomdevice_control.loadAcquire()) & SetRandomData)) {
uint value = uint(qt_randomdevice_control.loadAcquire()) & RandomDataMask;
std::fill_n(buffer, count, value);
return;
}
qsizetype filled = 0;
if (qt_has_hwrng() && (uint(qt_randomdevice_control) & SkipHWRNG) == 0)
if (qt_has_hwrng() && (uint(qt_randomdevice_control.loadAcquire()) & SkipHWRNG) == 0)
filled += qt_random_cpu(buffer, count);
if (filled != count && (uint(qt_randomdevice_control) & SkipSystemRNG) == 0) {
if (filled != count && (uint(qt_randomdevice_control.loadAcquire()) & SkipSystemRNG) == 0) {
qsizetype bytesFilled =
fillBuffer(buffer + filled, (count - filled) * qsizetype(sizeof(*buffer)));
filled += bytesFilled / qsizetype(sizeof(*buffer));
@ -1222,7 +1222,7 @@ void QRandomGenerator::_fillRange(void *buffer, void *bufferEnd)
quint32 *begin = static_cast<quint32 *>(buffer);
quint32 *end = static_cast<quint32 *>(bufferEnd);
if (type == SystemRNG || Q_UNLIKELY(uint(qt_randomdevice_control) & (UseSystemRNG|SetRandomData)))
if (type == SystemRNG || Q_UNLIKELY(uint(qt_randomdevice_control.loadAcquire()) & (UseSystemRNG|SetRandomData)))
return SystemGenerator::self().generate(begin, end);
SystemAndGlobalGenerators::PRNGLocker lock(this);

4
src/corelib/global/qrandom_p.h
View File

@ -76,7 +76,9 @@ Q_CORE_EXPORT QBasicAtomicInteger<uint> qt_randomdevice_control = Q_BASIC_ATOMIC
#elif defined(QT_BUILD_INTERNAL)
extern Q_CORE_EXPORT QBasicAtomicInteger<uint> qt_randomdevice_control;
#else
enum { qt_randomdevice_control = 0 };
static const struct {
uint loadAcquire() const { return 0; }
} qt_randomdevice_control;
#endif
inline bool qt_has_hwrng()

2
src/corelib/kernel/qobject.cpp
View File

@ -421,7 +421,7 @@ void QObjectPrivate::ConnectionData::cleanOrphanedConnectionsImpl(QObject *sende
ConnectionOrSignalVector *c = nullptr;
{
QBasicMutexLocker l(signalSlotLock(sender));
if (ref > 1)
if (ref.loadAcquire() > 1)
return;
// Since ref == 1, no activate() is in process since we locked the mutex. That implies,

2
src/corelib/kernel/qobject_p.h
View File

@ -279,7 +279,7 @@ public:
void removeConnection(Connection *c);
void cleanOrphanedConnections(QObject *sender)
{
if (orphaned.loadRelaxed() && ref == 1)
if (orphaned.loadRelaxed() && ref.loadAcquire() == 1)
cleanOrphanedConnectionsImpl(sender);
}
void cleanOrphanedConnectionsImpl(QObject *sender);