diff --git a/auto/os/freebsd b/auto/os/freebsd
index 88654ba..6aa823f 100644
--- a/auto/os/freebsd
+++ b/auto/os/freebsd
@@ -134,3 +134,11 @@
         exit 1
     fi
 fi
+
+
+# cpuset_setaffinity()
+
+if [ $version -ge 701000 ]; then
+    echo " + cpuset_setaffinity() found"
+    have=NGX_HAVE_CPUSET_SETAFFINITY . auto/have
+fi
diff --git a/auto/os/linux b/auto/os/linux
index dba11a4..c506d3d 100644
--- a/auto/os/linux
+++ b/auto/os/linux
@@ -128,8 +128,9 @@
 ngx_feature_incs="#include <sched.h>"
 ngx_feature_path=
 ngx_feature_libs=
-ngx_feature_test="long mask = 0;
-                  sched_setaffinity(0, 32, (cpu_set_t *) &mask)"
+ngx_feature_test="cpu_set_t mask;
+                  CPU_ZERO(&mask);
+                  sched_setaffinity(0, sizeof(cpu_set_t), &mask)"
 . auto/feature
 
 
diff --git a/auto/sources b/auto/sources
index c48c3ad..374ad66 100644
--- a/auto/sources
+++ b/auto/sources
@@ -145,6 +145,7 @@
             src/os/unix/ngx_channel.h \
             src/os/unix/ngx_shmem.h \
             src/os/unix/ngx_process.h \
+            src/os/unix/ngx_setaffinity.h \
             src/os/unix/ngx_setproctitle.h \
             src/os/unix/ngx_atomic.h \
             src/os/unix/ngx_gcc_atomic_x86.h \
@@ -179,6 +180,7 @@
             src/os/unix/ngx_shmem.c \
             src/os/unix/ngx_process.c \
             src/os/unix/ngx_daemon.c \
+            src/os/unix/ngx_setaffinity.c \
             src/os/unix/ngx_setproctitle.c \
             src/os/unix/ngx_posix_init.c \
             src/os/unix/ngx_user.c \
diff --git a/src/core/nginx.c b/src/core/nginx.c
index e8fcbae..19feb07 100644
--- a/src/core/nginx.c
+++ b/src/core/nginx.c
@@ -983,15 +983,15 @@
     ngx_conf_init_value(ccf->worker_processes, 1);
     ngx_conf_init_value(ccf->debug_points, 0);
 
-#if (NGX_HAVE_SCHED_SETAFFINITY)
+#if (NGX_HAVE_CPU_AFFINITY)
 
     if (ccf->cpu_affinity_n
         && ccf->cpu_affinity_n != 1
         && ccf->cpu_affinity_n != (ngx_uint_t) ccf->worker_processes)
     {
         ngx_log_error(NGX_LOG_WARN, cycle->log, 0,
-                      "number of the \"worker_processes\" is not equal to "
-                      "the number of the \"worker_cpu_affinity\" mask, "
+                      "the number of \"worker_processes\" is not equal to "
+                      "the number of \"worker_cpu_affinity\" masks, "
                       "using last mask for remaining worker processes");
     }
 
@@ -1242,11 +1242,11 @@
 static char *
 ngx_set_cpu_affinity(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
 {
-#if (NGX_HAVE_SCHED_SETAFFINITY)
+#if (NGX_HAVE_CPU_AFFINITY)
     ngx_core_conf_t  *ccf = conf;
 
     u_char            ch;
-    u_long           *mask;
+    uint64_t         *mask;
     ngx_str_t        *value;
     ngx_uint_t        i, n;
 
@@ -1254,7 +1254,7 @@
         return "is duplicate";
     }
 
-    mask = ngx_palloc(cf->pool, (cf->args->nelts - 1) * sizeof(long));
+    mask = ngx_palloc(cf->pool, (cf->args->nelts - 1) * sizeof(uint64_t));
     if (mask == NULL) {
         return NGX_CONF_ERROR;
     }
@@ -1266,9 +1266,9 @@
 
     for (n = 1; n < cf->args->nelts; n++) {
 
-        if (value[n].len > 32) {
+        if (value[n].len > 64) {
             ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
-                         "\"worker_cpu_affinity\" supports up to 32 CPU only");
+                         "\"worker_cpu_affinity\" supports up to 64 CPUs only");
             return NGX_CONF_ERROR;
         }
 
@@ -1311,7 +1311,7 @@
 }
 
 
-u_long
+uint64_t
 ngx_get_cpu_affinity(ngx_uint_t n)
 {
     ngx_core_conf_t  *ccf;
diff --git a/src/core/ngx_cycle.h b/src/core/ngx_cycle.h
index dbc6e19..551b628 100644
--- a/src/core/ngx_cycle.h
+++ b/src/core/ngx_cycle.h
@@ -86,7 +86,7 @@
      int                      priority;
 
      ngx_uint_t               cpu_affinity_n;
-     u_long                  *cpu_affinity;
+     uint64_t                *cpu_affinity;
 
      char                    *username;
      ngx_uid_t                user;
@@ -124,7 +124,7 @@
 void ngx_reopen_files(ngx_cycle_t *cycle, ngx_uid_t user);
 char **ngx_set_environment(ngx_cycle_t *cycle, ngx_uint_t *last);
 ngx_pid_t ngx_exec_new_binary(ngx_cycle_t *cycle, char *const *argv);
-u_long ngx_get_cpu_affinity(ngx_uint_t n);
+uint64_t ngx_get_cpu_affinity(ngx_uint_t n);
 ngx_shm_zone_t *ngx_shared_memory_add(ngx_conf_t *cf, ngx_str_t *name,
     size_t size, void *tag);
 
diff --git a/src/os/unix/ngx_process.h b/src/os/unix/ngx_process.h
index bd0252b..7b5e8c0 100644
--- a/src/os/unix/ngx_process.h
+++ b/src/os/unix/ngx_process.h
@@ -9,6 +9,7 @@
 #define _NGX_PROCESS_H_INCLUDED_
 
 
+#include <ngx_setaffinity.h>
 #include <ngx_setproctitle.h>
 
 
diff --git a/src/os/unix/ngx_process_cycle.c b/src/os/unix/ngx_process_cycle.c
index 2b6f4c7..82cf8e6 100644
--- a/src/os/unix/ngx_process_cycle.c
+++ b/src/os/unix/ngx_process_cycle.c
@@ -62,7 +62,7 @@
 #endif
 
 
-u_long         cpu_affinity;
+uint64_t       cpu_affinity;
 static u_char  master_process[] = "master process";
 
 
@@ -913,23 +913,10 @@
         }
     }
 
-#if (NGX_HAVE_SCHED_SETAFFINITY)
-
     if (cpu_affinity) {
-        ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0,
-                      "sched_setaffinity(0x%08Xl)", cpu_affinity);
-
-        if (sched_setaffinity(0, sizeof(cpu_affinity),
-                              (cpu_set_t *) &cpu_affinity)
-            == -1)
-        {
-            ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
-                          "sched_setaffinity(0x%08Xl) failed", cpu_affinity);
-        }
+        ngx_setaffinity(cpu_affinity, cycle->log);
     }
 
-#endif
-
 #if (NGX_HAVE_PR_SET_DUMPABLE)
 
     /* allow coredump after setuid() in Linux 2.4.x */
diff --git a/src/os/unix/ngx_setaffinity.c b/src/os/unix/ngx_setaffinity.c
new file mode 100644
index 0000000..8f6cf35
--- /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
diff --git a/src/os/unix/ngx_setaffinity.h b/src/os/unix/ngx_setaffinity.h
new file mode 100644
index 0000000..33f5835
--- /dev/null
+++ b/src/os/unix/ngx_setaffinity.h
@@ -0,0 +1,23 @@
+
+/*
+ * Copyright (C) Nginx, Inc.
+ */
+
+#ifndef _NGX_SETAFFINITY_H_INCLUDED_
+#define _NGX_SETAFFINITY_H_INCLUDED_
+
+
+#if (NGX_HAVE_SCHED_SETAFFINITY || NGX_HAVE_CPUSET_SETAFFINITY)
+
+#define NGX_HAVE_CPU_AFFINITY 1
+
+void ngx_setaffinity(uint64_t cpu_affinity, ngx_log_t *log);
+
+#else
+
+#define ngx_setaffinity(cpu_affinity, log)
+
+#endif
+
+
+#endif /* _NGX_SETAFFINITY_H_INCLUDED_ */