new file mode 100644
--- /dev/null
+++ b/src/core/ngx_garbage_collector.c
@@ -0,0 +1,256 @@
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+
+
+typedef struct ngx_gc_s  ngx_gc_t;
+
+typedef int (*ngx_gc_handler_pt) (ngx_gc_t *ctx, ngx_str_t *name,
+                                  ngx_file_info_t *fi);
+
+struct ngx_gc_s {
+    ngx_path_t         *path;
+    u_int               deleted;
+    off_t               freed;
+    ngx_gc_handler_pt   handler;
+    ngx_log_t          *log;
+};
+
+
+static int ngx_collect_garbage(ngx_gc_t *ctx, ngx_str_t *dname, int level);
+
+
+
+#if 0
+
+{
+    ngx_test_null(cycle->timer_events,
+                  ngx_alloc(sizeof(ngx_event_t) * TIMERS, cycle->log),
+                  NGX_ERROR);
+
+    ngx_event_timer_init(cycle);
+}
+
+
+void garbage_collector()
+{
+    ngx_msec_t        timer;
+    struct timeval    tv;
+    ngx_epoch_msec_t  delta;
+
+    for ( ;; ) {
+        timer = ngx_event_find_timer();
+
+        ngx_gettimeofday(&tv);
+        delta = tv.tv_sec * 1000 + tv.tv_usec / 1000;
+
+        msleep(timer);
+
+        ngx_gettimeofday(&tv);
+
+        ngx_cached_time = tv.tv_sec;
+        ngx_time_update();
+
+        delta = tv.tv_sec * 1000 + tv.tv_usec / 1000 - delta;
+
+        ngx_event_expire_timers((ngx_msec_t) delta);
+    }
+}
+
+#endif
+
+
+void stub_init(ngx_log_t *log)
+{
+    ngx_gc_t    *ctx;
+    ngx_path_t   path;
+
+    if (!(ctx = ngx_alloc(sizeof(ngx_gc_t), log))) {
+        return;
+    }
+
+    path.name.len = 4;
+    path.name.data = "temp";
+    path.len = 5;
+    path.level[0] = 1;
+    path.level[1] = 2;
+    path.level[2] = 0;
+
+    ctx->path = &path;
+    ctx->log = log;
+
+    ngx_collect_garbage(ctx, &path.name, 0);
+}
+
+
+static int ngx_collect_garbage(ngx_gc_t *ctx, ngx_str_t *dname, int level)
+{
+    int               nlen;
+    char             *last;
+    ngx_str_t         fname;
+    ngx_dir_t        *dir;
+    ngx_dirent_t     *de;
+    ngx_file_info_t   fi;
+
+    fname.len = 0;
+
+ngx_log_debug(ctx->log, "dir %s" _ dname->data);
+
+    dir = ngx_open_dir(dname->data);
+
+    if (dir == NULL) {
+        ngx_log_error(NGX_LOG_ERR, ctx->log, ngx_errno,
+                     ngx_open_dir_n " \"%s\" failed", dname->data);
+        return NGX_ERROR;
+    }
+
+    for ( ;; ) {
+        de = ngx_read_dir(dir);
+
+        if (de == NULL) {
+            if (fname.len) {
+                ngx_free(fname.data);
+            }
+            break;
+        }
+
+ngx_log_debug(ctx->log, "file %s" _ de->d_name);
+
+#ifdef __FreeBSD__
+        nlen = de->d_namlen;
+#else
+        nlen = ngx_strlen(de->d_name);
+#endif
+
+        if (nlen == 1 && de->d_name[0] == '.') {
+            continue;
+        }
+
+        if (nlen == 2 && de->d_name[0] == '.' && de->d_name[1] == '.') {
+            continue;
+        }
+
+        if (dname->len + 1 + nlen > fname.len) {
+            if (fname.len) {
+                ngx_free(fname.data);
+            }
+
+            fname.len = dname->len + 1 + nlen;
+
+            if (!(fname.data = ngx_alloc(fname.len + 1, ctx->log))) {
+                return NGX_ABORT;
+            }
+        }
+
+        last = ngx_cpymem(fname.data, dname->data, dname->len);
+        *last++ = '/';
+        ngx_memcpy(last, de->d_name, nlen + 1);
+
+ngx_log_debug(ctx->log, "de %s" _ fname.data);
+
+        if (ngx_file_type(fname.data, &fi) == NGX_FILE_ERROR) {
+            ngx_log_error(NGX_LOG_CRIT, ctx->log, ngx_errno,
+                          ngx_file_type_n " \"%s\" failed", fname.data);
+            continue;
+        }
+
+        if (ngx_is_dir((&fi))) {
+
+ngx_log_debug(ctx->log, "enter %s" _ fname.data);
+
+            if (level == -1
+                   /* there can not be directory on the last level */
+                || level == NGX_MAX_PATH_LEVEL
+                   /* an directory from the old path hierarchy */
+                || nlen != ctx->path->level[level])
+            {
+                if (ngx_collect_garbage(ctx, &fname, -1) == NGX_ABORT) {
+                    return NGX_ABORT;
+                }
+
+                ngx_log_error(NGX_LOG_NOTICE, ctx->log, 0,
+                              "delete old hierachy directory \"%s\"",
+                              fname.data);
+
+                if (ngx_delete_dir(fname.data) == NGX_FILE_ERROR) {
+                    ngx_log_error(NGX_LOG_CRIT, ctx->log, ngx_errno,
+                                  ngx_delete_dir_n " \"%s\" failed",
+                                  fname.data);
+                } else {
+                    ctx->deleted++;
+                    ctx->freed += ngx_file_size((&fi));
+                }
+
+                continue;
+            }
+
+            if (ngx_collect_garbage(ctx, &fname, level + 1) == NGX_ABORT) {
+                return NGX_ABORT;
+            }
+
+        } else if (ngx_is_file((&fi))) {
+
+            if (level == -1
+                || (level < NGX_MAX_PATH_LEVEL && ctx->path->level[level] != 0))
+            {
+                if (ngx_delete_file(fname.data) == NGX_FILE_ERROR) {
+                    ngx_log_error(NGX_LOG_CRIT, ctx->log, ngx_errno,
+                                  ngx_delete_file_n " \"%s\" failed",
+                                  fname.data);
+                } else {
+                    ctx->deleted++;
+                    ctx->freed += ngx_file_size((&fi));
+                }
+
+                continue;
+            }
+
+            if (ctx->handler(ctx, &fname, &fi) == NGX_ABORT) {
+                return NGX_ABORT;
+            }
+
+        } else {
+            ngx_log_error(NGX_LOG_CRIT, ctx->log, ngx_errno,
+                          "\"%s\" has unknown file type, deleting", fname.data);
+
+            if (ngx_delete_file(fname.data) == NGX_FILE_ERROR) {
+                ngx_log_error(NGX_LOG_CRIT, ctx->log, ngx_errno,
+                              ngx_delete_file_n " \"%s\" failed", fname.data);
+            } else {
+                ctx->deleted++;
+                ctx->freed += ngx_file_size((&fi));
+            }
+        }
+    }
+
+    return NGX_OK;
+}
+
+
+int ngx_garbage_collector_temp_handler(ngx_gc_t *ctx, ngx_str_t *name,
+                                       ngx_file_info_t *fi)
+{
+    /*
+     * we use mtime only and do not use atime because:
+     *    on NTFS access time has a resolution of 1 hour,
+     *    on NT FAT access time has a resolution of 1 day,
+     *    Unices have mount option "noatime"
+     */
+
+    if (ngx_cached_time - ngx_file_mtime(fi) < 3600) {
+        return NGX_OK;
+    }
+
+    ngx_log_error(NGX_LOG_NOTICE, ctx->log, 0,
+                  "delete stale temporary \"%s\"", name->data);
+
+    if (ngx_delete_file(name->data) == NGX_FILE_ERROR) {
+        ngx_log_error(NGX_LOG_CRIT, ctx->log, ngx_errno,
+                      ngx_delete_file_n " \"%s\" failed", name->data);
+        return NGX_ERROR;
+    }
+
+    ctx->deleted++;
+    ctx->freed += ngx_file_size(fi);
+    return NGX_OK;
+}