path: root/src/sched/sched_cpucount.c
diff options
authorRich Felker <>2013-08-10 21:15:11 -0400
committerRich Felker <>2013-08-10 21:15:11 -0400
commiteeb0328f203cfb8990b3eee5ee31d931fc539ceb (patch)
tree99558d1b944c1cf76f33faab7e294c72480a7328 /src/sched/sched_cpucount.c
parent76fbf6ad4bb2f697512a1541d296c1f749e3b504 (diff)
add cpu affinity interfaces
this first commit just includes the CPU_* and sched_* interfaces, not the pthread_* interfaces, which may be added later. simple sanity-check testing has been done for the basic interfaces, but most of the macros have not yet been tested.
Diffstat (limited to 'src/sched/sched_cpucount.c')
1 files changed, 11 insertions, 0 deletions
diff --git a/src/sched/sched_cpucount.c b/src/sched/sched_cpucount.c
new file mode 100644
index 00000000..94aa259e
--- /dev/null
+++ b/src/sched/sched_cpucount.c
@@ -0,0 +1,11 @@
+#define _GNU_SOURCE
+#include <sched.h>
+int __sched_cpucount(size_t size, const cpu_set_t *set)
+ size_t i, j, cnt=0;
+ const unsigned char *p = (const void *)set;
+ for (i=0; i<size; i++) for (j=0; j<8; j++)
+ if (p[i] & (1<<j)) cnt++;
+ return cnt;