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| author | Derek Mauro <dmauro@google.com> | 2023-04-12 13:26:48 -0700 |
|---|---|---|
| committer | Copybara-Service <copybara-worker@google.com> | 2023-04-12 13:27:28 -0700 |
| commit | c23acb9b5636e7b908fba03d6b3584d8f80dba6d (patch) | |
| tree | cc2332512cecd0d3efb2f3819516fb6d7af44bc6 /absl/synchronization/internal/kernel_timeout_test.cc | |
| parent | 32d314d0f5bb0ca3ff71ece49c71a728c128d43e (diff) | |
| download | abseil-c23acb9b5636e7b908fba03d6b3584d8f80dba6d.tar.gz abseil-c23acb9b5636e7b908fba03d6b3584d8f80dba6d.tar.bz2 abseil-c23acb9b5636e7b908fba03d6b3584d8f80dba6d.zip | |
Synchronization: Consolidate the logic for whether steady clocks are supported
for relative timeouts
PiperOrigin-RevId: 523789416
Change-Id: Ide4cfdcae9ea7bffca3355c80ea9c8833a9536e6
Diffstat (limited to 'absl/synchronization/internal/kernel_timeout_test.cc')
| -rw-r--r-- | absl/synchronization/internal/kernel_timeout_test.cc | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/absl/synchronization/internal/kernel_timeout_test.cc b/absl/synchronization/internal/kernel_timeout_test.cc index c853c4bc..e3286f7f 100644 --- a/absl/synchronization/internal/kernel_timeout_test.cc +++ b/absl/synchronization/internal/kernel_timeout_test.cc @@ -14,14 +14,34 @@ #include "absl/synchronization/internal/kernel_timeout.h" +#include <ctime> #include <chrono> // NOLINT(build/c++11) #include <limits> +#include "absl/random/random.h" #include "gtest/gtest.h" #include "absl/base/config.h" #include "absl/time/clock.h" #include "absl/time/time.h" +// Test go/btm support by randomizing the value clock_gettime() for +// CLOCK_MONOTONIC. This works by overriding a weak symbol in glibc. +// We should be resistant to this randomization when !SupportsSteadyClock(). +#ifdef __GOOGLE_GRTE_VERSION__ +extern "C" int __clock_gettime(clockid_t c, struct timespec* ts); + +extern "C" int clock_gettime(clockid_t c, struct timespec* ts) { + if (c == CLOCK_MONOTONIC && + !absl::synchronization_internal::KernelTimeout::SupportsSteadyClock()) { + absl::SharedBitGen gen; + ts->tv_sec = absl::Uniform(gen, 0, 1'000'000'000); + ts->tv_nsec = absl::Uniform(gen, 0, 1'000'000'000); + return 0; + } + return __clock_gettime(c, ts); +} +#endif // __GOOGLE_GRTE_VERSION__ + namespace { #if defined(ABSL_HAVE_ADDRESS_SANITIZER) || \ |