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cycleclock: Use clock_gettime() as fallback for any Linux architecture #1899

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Jan 8, 2025
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cycleclock: Use clock_gettime() as fallback for any Linux architecture #1899

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4 changes: 3 additions & 1 deletion src/cycleclock.h
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Original file line number Diff line number Diff line change
Expand Up @@ -229,10 +229,12 @@ inline BENCHMARK_ALWAYS_INLINE int64_t Now() {
struct timeval tv;
gettimeofday(&tv, nullptr);
return static_cast<int64_t>(tv.tv_sec) * 1000000 + tv.tv_usec;
#elif defined(__hppa__)
#elif defined(__hppa__) || defined(__linux__)
// Fallback for all other architectures with a recent Linux kernel, e.g.:
// HP PA-RISC provides a user-readable clock counter (cr16), but
// it's not syncronized across CPUs and only 32-bit wide when programs
// are built as 32-bit binaries.
// Same for SH-4 and possibly others.
// Use clock_gettime(CLOCK_MONOTONIC, ...) instead of gettimeofday
// because is provides nanosecond resolution.
// Initialize to always return 0 if clock_gettime fails.
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