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-rw-r--r--src/xz/mytime.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/src/xz/mytime.c b/src/xz/mytime.c
index 4c13d377..ddfd5deb 100644
--- a/src/xz/mytime.c
+++ b/src/xz/mytime.c
@@ -12,7 +12,7 @@
#include "private.h"
-#if defined(_MSC_VER)
+#if defined(MYTHREAD_VISTA) || defined(_MSC_VER)
// Nothing
#elif defined(HAVE_CLOCK_GETTIME)
# include <time.h>
@@ -47,8 +47,16 @@ static uint64_t next_flush;
static uint64_t
mytime_now(void)
{
-#if defined(_MSC_VER)
- // NOTE: This requires Windows Vista or later.
+#if defined(MYTHREAD_VISTA) || defined(_MSC_VER)
+ // Since there is no SIGALRM on Windows, this function gets
+ // called frequently when the progress indicator is in use.
+ // Progress indicator doesn't need high-resolution time.
+ // GetTickCount64() has very low overhead but needs at least WinVista.
+ //
+ // MinGW-w64 provides the POSIX functions clock_gettime() and
+ // gettimeofday() in a manner that allow xz to run on older
+ // than WinVista. If the threading method needs WinVista anyway,
+ // there's no reason to avoid a WinVista API here either.
return GetTickCount64();
#elif defined(HAVE_CLOCK_GETTIME)