Hi Yaakov,
May I update the version of util-linux available on Cygwin? Your cygport
file for the current 2.33.1 seems to work fine for the latest 2.35.1.
I would add a patch file 2.33.1-cygwin-cpuset.patch (see attached) and
update the cygport file to reference this additional patch and remove the
"--disable-schedutils" from CYGCONF_ARGS. With these changes a working
'taskset.exe' will be an additional build output.
I would package the latest util-linux 2.35.1 unless you'd prefer some
intermediate version.
Thank you,
..mark
--- origsrc/util-linux-2.33.1/lib/cpuset.c 2018-06-04 00:57:02.792445800
-0700
+++ src/util-linux-2.33.1/lib/cpuset.c 2020-01-11 00:37:39.126054200 -0800
@@ -60,7 +60,7 @@ static const char *nexttoken(const char
*/
int get_max_number_of_cpus(void)
{
-#ifdef SYS_sched_getaffinity
+#if defined(SYS_sched_getaffinity) || defined(__CYGWIN__)
int n, cpus = 2048;
size_t setsize;
cpu_set_t *set = cpuset_alloc(cpus, &setsize, NULL);
@@ -72,7 +72,11 @@ int get_max_number_of_cpus(void)
CPU_ZERO_S(setsize, set);
/* the library version does not return size of cpumask_t */
+#if defined(__CYGWIN__)
+ n = __sched_getaffinity_sys(0, setsize, set);
+#else
n = syscall(SYS_sched_getaffinity, 0, setsize, set);
+#endif
if (n < 0 && errno == EINVAL && cpus < 1024 * 1024) {
cpuset_free(set);
