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Bug 655413 - Don't bump timer frequency in the IPC code. r=cjones

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This commit is contained in:
Anselmo Diaz 2012-06-03 08:09:28 +02:00
parent 7b218c3f48
commit 0edf60727a
1 changed files with 2 additions and 33 deletions
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35
ipc/chromium/src/base/time_win.cc
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@ -227,22 +227,11 @@ DWORD (*tick_function)(void) = &timeGetTimeWrapper;
// which will roll over the 32-bit value every ~49 days. We try to track
// rollover ourselves, which works if TimeTicks::Now() is called at least every
// 49 days.
class NowSingleton : public base::SystemMonitor::PowerObserver {
class NowSingleton {
public:
NowSingleton()
: rollover_(TimeDelta::FromMilliseconds(0)),
last_seen_(0),
hi_res_clock_enabled_(false) {
base::SystemMonitor* system = base::SystemMonitor::Get();
system->AddObserver(this);
UseHiResClock(!system->BatteryPower());
}
~NowSingleton() {
UseHiResClock(false);
base::SystemMonitor* monitor = base::SystemMonitor::Get();
if (monitor)
monitor->RemoveObserver(this);
last_seen_(0) {
}
TimeDelta Now() {
@ -256,30 +245,10 @@ class NowSingleton : public base::SystemMonitor::PowerObserver {
return TimeDelta::FromMilliseconds(now) + rollover_;
}
// Interfaces for monitoring Power changes.
void OnPowerStateChange(base::SystemMonitor* system) {
UseHiResClock(!system->BatteryPower());
}
void OnSuspend(base::SystemMonitor* system) {}
void OnResume(base::SystemMonitor* system) {}
private:
// Enable or disable the faster multimedia timer.
void UseHiResClock(bool enabled) {
if (enabled == hi_res_clock_enabled_)
return;
if (enabled)
timeBeginPeriod(1);
else
timeEndPeriod(1);
hi_res_clock_enabled_ = enabled;
}
Lock lock_; // To protected last_seen_ and rollover_.
TimeDelta rollover_; // Accumulation of time lost due to rollover.
DWORD last_seen_; // The last timeGetTime value we saw, to detect rollover.
bool hi_res_clock_enabled_;
DISALLOW_COPY_AND_ASSIGN(NowSingleton);
};