bpo-21302: Add clock_nanosleep() implementation for time.sleep() (GH-28111)

In Unix operating systems, time.sleep() now uses the clock_nanosleep() function,
if available, which allows to sleep for an interval specified with nanosecond precision.

Co-authored-by: Victor Stinner <vstinner@python.org>

1 files changed, 58 insertions, 0 deletions

diff --git a/configure b/configure
index 4f12972..2e3c9ba 100755
--- a/configure
+++ b/configure
@@ -13252,6 +13252,64 @@ fi
 done
 
 
+for ac_func in clock_nanosleep
+do :
+  ac_fn_c_check_func "$LINENO" "clock_nanosleep" "ac_cv_func_clock_nanosleep"
+if test "x$ac_cv_func_clock_nanosleep" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_CLOCK_NANOSLEEP 1
+_ACEOF
+
+else
+
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for clock_nanosleep in -lrt" >&5
+$as_echo_n "checking for clock_nanosleep in -lrt... " >&6; }
+if ${ac_cv_lib_rt_clock_nanosleep+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lrt  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char clock_nanosleep ();
+int
+main ()
+{
+return clock_nanosleep ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_rt_clock_nanosleep=yes
+else
+  ac_cv_lib_rt_clock_nanosleep=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_rt_clock_nanosleep" >&5
+$as_echo "$ac_cv_lib_rt_clock_nanosleep" >&6; }
+if test "x$ac_cv_lib_rt_clock_nanosleep" = xyes; then :
+
+        $as_echo "#define HAVE_CLOCK_NANOSLEEP 1" >>confdefs.h
+
+
+fi
+
+
+fi
+done
+
+
 for ac_func in clock_getres
 do :
   ac_fn_c_check_func "$LINENO" "clock_getres" "ac_cv_func_clock_getres"