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Android: fix timed QWaitCondition::wait() on Android >= 5.0.

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wait() was always returning immediately, regardless of the timeout
value, due to a timespec comparison from different clock types.
On Android 5.0, qt_gettime() uses the monotonic clock but the wait
condition was using the real time clock.

__pthread_cond_timedwait_relative() is not exported anymore in
Android 5.0, we therefore fall back to pthread_cond_timedwait().
Since the monotonic clock is now available, qt_gettime returns
a time based on it. The wait condition consequently needs
to use the monotonic clock.

Change-Id: Ie7cf909b81107edd7207c3c039b3ec1f5422303f
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@theqtcompany.com>
This commit is contained in:
Yoann Lopes 2015-02-10 16:01:22 +01:00
parent 8fccfef424
commit 921dd85c7a
1 changed files with 13 additions and 5 deletions
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18
src/corelib/thread/qwaitcondition_unix.cpp
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@ -52,9 +52,12 @@
QT_BEGIN_NAMESPACE
#ifdef Q_OS_ANDROID
// Android lacks pthread_condattr_setclock, but it does have a nice function
// for relative waits. Use weakref so we can determine at runtime whether it is
// present.
// pthread_condattr_setclock is available only since Android 5.0. On older versions, there's
// a private function for relative waits (hidden in 5.0).
// Use weakref so we can determine at runtime whether each of them is present.
static int local_condattr_setclock(pthread_condattr_t*, clockid_t)
__attribute__((weakref("pthread_condattr_setclock")));
static int local_cond_timedwait_relative(pthread_cond_t*, pthread_mutex_t *, const timespec *)
__attribute__((weakref("__pthread_cond_timedwait_relative")));
#endif
@ -70,9 +73,14 @@ void qt_initialize_pthread_cond(pthread_cond_t *cond, const char *where)
pthread_condattr_t condattr;
pthread_condattr_init(&condattr);
#if !defined(Q_OS_MAC) && !defined(Q_OS_ANDROID) && (_POSIX_MONOTONIC_CLOCK-0 >= 0)
#if (_POSIX_MONOTONIC_CLOCK-0 >= 0)
#if defined(Q_OS_ANDROID)
if (local_condattr_setclock && QElapsedTimer::clockType() == QElapsedTimer::MonotonicClock)
local_condattr_setclock(&condattr, CLOCK_MONOTONIC);
#elif !defined(Q_OS_MAC)
if (QElapsedTimer::clockType() == QElapsedTimer::MonotonicClock)
pthread_condattr_setclock(&condattr, CLOCK_MONOTONIC);
#endif
#endif
report_error(pthread_cond_init(cond, &condattr), where, "cv init");
pthread_condattr_destroy(&condattr);
@ -108,7 +116,7 @@ public:
{
timespec ti;
#ifdef Q_OS_ANDROID
if (Q_LIKELY(local_cond_timedwait_relative)) {
if (local_cond_timedwait_relative) {
ti.tv_sec = time / 1000;
ti.tv_nsec = time % 1000 * Q_UINT64_C(1000) * 1000;
return local_cond_timedwait_relative(&cond, &mutex, &ti);