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QHostInfo: replace a volatile bool with an atomic int

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A volatile bool read/store is documented on MSVC to have acquire/release
semantics, respectively, but that doesn't need to be true for MinGW, so
use explicit memory ordering.

Apply the same fix to the Unix implementation, too.

Change-Id: Ica466cec50beed830aafa4e3384d82f02e1a47e8
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Shane Kearns <shane.kearns@accenture.com>
This commit is contained in:
Marc Mutz 2012-08-24 09:47:55 +02:00 committed by Qt by Nokia
parent e0d3874525
commit 462a266edf
2 changed files with 10 additions and 8 deletions
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9
src/network/kernel/qhostinfo_unix.cpp
View File

@ -48,6 +48,7 @@
#include "qiodevice.h"
#include <qbytearray.h>
#include <qlibrary.h>
#include <qbasicatomic.h>
#include <qurl.h>
#include <qfile.h>
#include <private/qmutexpool_p.h>
@ -127,12 +128,12 @@ QHostInfo QHostInfoAgent::fromName(const QString &hostName)
#endif
// Load res_init on demand.
static volatile bool triedResolve = false;
if (!triedResolve) {
static QBasicAtomicInt triedResolve = Q_BASIC_ATOMIC_INITIALIZER(false);
if (!triedResolve.loadAcquire()) {
QMutexLocker locker(QMutexPool::globalInstanceGet(&local_res_init));
if (!triedResolve) {
if (!triedResolve.load()) {
resolveLibrary();
triedResolve = true;
triedResolve.storeRelease(true);
}
}

9
src/network/kernel/qhostinfo_win.cpp
View File

@ -46,6 +46,7 @@
#include <ws2tcpip.h>
#include <private/qsystemlibrary_p.h>
#include <qmutex.h>
#include <qbasicatomic.h>
#include <qurl.h>
#include <private/qmutexpool_p.h>
@ -121,12 +122,12 @@ QHostInfo QHostInfoAgent::fromName(const QString &hostName)
QWindowsSockInit winSock;
// Load res_init on demand.
static volatile bool triedResolve = false;
if (!triedResolve) {
static QBasicAtomicInt triedResolve = Q_BASIC_ATOMIC_INITIALIZER(false);
if (!triedResolve.loadAcquire()) {
QMutexLocker locker(QMutexPool::globalInstanceGet(&local_getaddrinfo));
if (!triedResolve) {
if (!triedResolve.load()) {
resolveLibrary();
triedResolve = true;
triedResolve.storeRelease(true);
}
}