Changes to get Perfetto tracing in Chrome for Windows
A thin compatibility layer and some #ifdefs are enough to let the code
compile. Wrappers for writev are added, and getuid and geteuid just
return 0. SleepMicroseconds is added to replace usleep and a useconds_t
type is added.
This is sufficient to get Chrome building with Perfetto tracing
enabled, on Windows.
Bug: 78878306
Change-Id: I1297e2dbf1f5e99da1659be85064f4abf76607d9
diff --git a/src/base/time.cc b/src/base/time.cc
index c371eb6..8e22d59 100644
--- a/src/base/time.cc
+++ b/src/base/time.cc
@@ -19,10 +19,15 @@
#if PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
#include <Windows.h>
+#else
+#include <unistd.h>
+#endif
namespace perfetto {
namespace base {
+#if PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
+
TimeNanos GetWallTimeNs() {
LARGE_INTEGER freq;
::QueryPerformanceFrequency(&freq);
@@ -44,7 +49,21 @@
return TimeNanos((kernel_time + user_time) * 100);
}
-} // namespace base
-} // namespace perfetto
+void SleepMicroseconds(unsigned interval_us) {
+ // The Windows Sleep function takes a millisecond count. Round up so that
+ // short sleeps don't turn into a busy wait. Note that the sleep granularity
+ // on Windows can dynamically vary from 1 ms to ~16 ms, so don't count on this
+ // being a short sleep.
+ ::Sleep(static_cast<DWORD>((interval_us + 999) / 1000));
+}
+
+#else // PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
+
+void SleepMicroseconds(unsigned interval_us) {
+ ::usleep(static_cast<useconds_t>(interval_us));
+}
#endif // PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
+
+} // namespace base
+} // namespace perfetto
