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UWP doesn't allow reading regkeys (#594)

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* UWP doesn't allow reading regkeys.

Unfortunately, UWP also doesn't offer an API for returning nominal processor frequency at this moment. Other options would require apps depending on abseil-cpp to be packaged with extra manifest data or libraries for bridging platforms.

This change pushes the unsupported APIs accessing the registry behind a define guard. This define guard makes GetNominalCPUFrequency to compile and run as usual on desktop, but it will return the value 1.0 on UWP Apps (Store).

* Using WINAPI_FAMILY_PARTITION family of macros for detecting when building for
UWP or Desktop.

* Simplifying comment to please the lint tool.
This commit is contained in:
Augusto Righetto 2020-03-09 05:55:40 -07:00 • committed by GitHub
parent 40a0e58eb3
commit 417ea99cba
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7
absl/base/internal/sysinfo.cc
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@ -72,6 +72,12 @@ static int GetNumCPUs() {
#if defined(_WIN32)
static double GetNominalCPUFrequency() {
// UWP apps don't have access to the registry and currently don't provide an
// API informing about CPU nominal frequency.
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP) && \
!WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
return 1.0;
#else
#pragma comment(lib, "advapi32.lib") // For Reg* functions.
HKEY key;
// Use the Reg* functions rather than the SH functions because shlwapi.dll
@ -91,6 +97,7 @@ static double GetNominalCPUFrequency() {
}
}
return 1.0;
#endif // WINAPI_PARTITION_APP && !WINAPI_PARTITION_DESKTOP
}
#elif defined(CTL_HW) && defined(HW_CPU_FREQ)