QtMiscUtils: add std::chrono::duration <-> timespec helpers

Change-Id: I91f36a3d651fd57443072fde4c3e8f811682328e
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/src/corelib/tools/qtools_p.h b/src/corelib/tools/qtools_p.h
index 1423a672d6..2c7ad6f0de 100644
--- a/src/corelib/tools/qtools_p.h
+++ b/src/corelib/tools/qtools_p.h
@@ -16,7 +16,10 @@
 //
 
 #include "QtCore/private/qglobal_p.h"
+
+#include <chrono>
 #include <limits.h>
+#include <time.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -104,8 +107,32 @@ constexpr inline int qt_lencmp(qsizetype lhs, qsizetype rhs) noexcept
            lhs >  rhs ? 1 :
            /* else */  -1 ;
 }
+
+inline timespec durationToTimespec(std::chrono::nanoseconds timeout) noexcept
+{
+    using namespace std::chrono;
+    const seconds secs = duration_cast<seconds>(timeout);
+    const nanoseconds frac = timeout - secs;
+    struct timespec ts;
+    ts.tv_sec = secs.count();
+    ts.tv_nsec = frac.count();
+    return ts;
+}
+
+template <typename Duration>
+inline Duration timespecToChrono(struct timespec *ts) noexcept
+{
+    using namespace std::chrono;
+    return duration_cast<Duration>(seconds{ts->tv_sec} + nanoseconds{ts->tv_nsec});
+}
+
+inline std::chrono::milliseconds timespecToChronoMs(struct timespec *ts) noexcept
+{
+    return timespecToChrono<std::chrono::milliseconds>(ts);
 }
 
+} // namespace QtMiscUtils
+
 // We typically need an extra bit for qNextPowerOfTwo when determining the next allocation size.
 constexpr qsizetype MaxAllocSize = (std::numeric_limits<qsizetype>::max)();