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Fix SleepFor(...) helper when a monotonic clock is not available. 

Single threaded builds often don't provide a monotonic clock, so we can't
always provide a monotonic SleepFor(...) implementation. Hopefully this
won't cause the builds to hang.

llvm-svn: 273091
This commit is contained in:
Eric Fiselier 2016-06-18 18:32:26 +00:00
parent 03a899957f
commit 824ed8c03e
1 changed files with 7 additions and 3 deletions
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10
libcxx/test/support/filesystem_test_helper.hpp
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@ -388,9 +388,13 @@ inline std::error_code GetTestEC() {
// available in single-threaded mode. // available in single-threaded mode.
void SleepFor(std::chrono::seconds dur) { void SleepFor(std::chrono::seconds dur) {
using namespace std::chrono; using namespace std::chrono;
const auto curr_time = steady_clock::now(); #if defined(_LIBCPP_HAS_NO_MONOTONIC_CLOCK)
auto wake_time = curr_time + dur; using Clock = system_clock;
while (steady_clock::now() < wake_time) #else
using Clock = steady_clock;
#endif
const auto wake_time = Clock::now() + dur;
while (Clock::now() < wake_time)
; ;
} }