new file mode 100644
--- /dev/null
+++ b/src/os/unix/ngx_setaffinity.c
@@ -0,0 +1,69 @@
+
+/*
+ * Copyright (C) Nginx, Inc.
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+
+
+#if (NGX_HAVE_CPUSET_SETAFFINITY)
+
+#include <sys/cpuset.h>
+
+void
+ngx_setaffinity(uint64_t cpu_affinity, ngx_log_t *log)
+{
+    cpuset_t    mask;
+    ngx_uint_t  i;
+
+    ngx_log_error(NGX_LOG_NOTICE, log, 0,
+                  "cpuset_setaffinity(0x%08Xl)", cpu_affinity);
+
+    CPU_ZERO(&mask);
+    i = 0;
+    do {
+        if (cpu_affinity & 1) {
+            CPU_SET(i, &mask);
+        }
+        i++;
+        cpu_affinity >>= 1;
+    } while (cpu_affinity);
+
+    if (cpuset_setaffinity(CPU_LEVEL_WHICH, CPU_WHICH_PID, -1,
+                           sizeof(cpuset_t), &mask) == -1)
+    {
+        ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
+                      "cpuset_setaffinity() failed");
+    }
+}
+
+#elif (NGX_HAVE_SCHED_SETAFFINITY)
+
+void
+ngx_setaffinity(uint64_t cpu_affinity, ngx_log_t *log)
+{
+    cpu_set_t   mask;
+    ngx_uint_t  i;
+
+    ngx_log_error(NGX_LOG_NOTICE, log, 0,
+                  "sched_setaffinity(0x%08Xl)", cpu_affinity);
+
+    CPU_ZERO(&mask);
+    i = 0;
+    do {
+        if (cpu_affinity & 1) {
+            CPU_SET(i, &mask);
+        }
+        i++;
+        cpu_affinity >>= 1;
+    } while (cpu_affinity);
+
+    if (sched_setaffinity(0, sizeof(cpu_set_t), &mask) == -1) {
+        ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
+                      "sched_setaffinity() failed");
+    }
+}
+
+#endif