diff --git a/src/os/unix/ngx_process.c b/src/os/unix/ngx_process.c
index 3210819..d49ba32 100644
--- a/src/os/unix/ngx_process.c
+++ b/src/os/unix/ngx_process.c
@@ -3,7 +3,7 @@
 #include <ngx_core.h>
 
 
-static void ngx_exec_proc(ngx_cycle_t *cycle, void *data);
+static void ngx_execute_proc(ngx_cycle_t *cycle, void *data);
 
 ngx_uint_t     ngx_last_process;
 ngx_process_t  ngx_processes[NGX_MAX_PROCESSES];
@@ -13,23 +13,8 @@
                             ngx_spawn_proc_pt proc, void *data,
                             char *name, ngx_int_t respawn)
 {
-#if 0
-    sigset_t   set, oset;
-#endif
     ngx_pid_t  pid;
 
-#if 0
-    if (respawn < 0) {
-        sigemptyset(&set);
-        sigaddset(&set, SIGCHLD);
-        if (sigprocmask(SIG_BLOCK, &set, &oset) == -1) {
-            ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
-                          "sigprocmask() failed while spawning %s", name);
-            return NGX_ERROR;
-        }
-    }
-#endif
-
     pid = fork();
 
     if (pid == -1) {
@@ -37,16 +22,6 @@
                       "fork() failed while spawning \"%s\"", name);
     }
 
-    if (pid == -1 || pid == 0) {
-#if 0
-        if (sigprocmask(SIG_SETMASK, &oset, &set) == -1) {
-            ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
-                          "sigprocmask() failed while spawning %s", name);
-            return NGX_ERROR;
-        }
-#endif
-    }
-
     switch (pid) {
     case -1:
         return NGX_ERROR;
@@ -81,26 +56,18 @@
     ngx_processes[ngx_last_process].exiting = 0;
     ngx_last_process++;
 
-#if 0
-    if (sigprocmask(SIG_SETMASK, &oset, &set) == -1) {
-        ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
-                      "sigprocmask() failed while spawning %s", name);
-        return NGX_ERROR;
-    }
-#endif
-
     return pid;
 }
 
 
-ngx_pid_t ngx_exec(ngx_cycle_t *cycle, ngx_exec_ctx_t *ctx)
+ngx_pid_t ngx_execute(ngx_cycle_t *cycle, ngx_exec_ctx_t *ctx)
 {
-    return ngx_spawn_process(cycle, ngx_exec_proc, ctx, ctx->name,
+    return ngx_spawn_process(cycle, ngx_execute_proc, ctx, ctx->name,
                              NGX_PROCESS_DETACHED);
 }
 
 
-static void ngx_exec_proc(ngx_cycle_t *cycle, void *data)
+static void ngx_execute_proc(ngx_cycle_t *cycle, void *data)
 {
     ngx_exec_ctx_t  *ctx = data;
 
@@ -114,47 +81,6 @@
 }
 
 
-#if 0
-
-void ngx_signal_processes(ngx_cycle_t *cycle)
-{
-    ngx_uint_t  i;
-
-    for (i = 0; i < ngx_last_process; i++) {
-
-        if (ngx_processes[i].signal0 == 0) {
-            continue;
-        }
-
-#if 0
-        if (ngx_processes[i].exited) {
-            if (i != --ngx_last_process) {
-                ngx_processes[i--] = ngx_processes[ngx_last_process];
-            }
-            continue;
-        }
-#endif
-
-        ngx_log_debug2(NGX_LOG_DEBUG_CORE, cycle->log, 0,
-                       "kill (" PID_T_FMT ", %d)" ,
-                       ngx_processes[i].pid, ngx_processes[i].signal0);
-
-        if (kill(ngx_processes[i].pid, ngx_processes[i].signal0) == -1) {
-            ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
-                          "kill(%d, %d) failed",
-                          ngx_processes[i].pid, ngx_processes[i].signal0);
-            continue;
-        }
-
-        if (ngx_processes[i].signal0 != ngx_signal_value(NGX_REOPEN_SIGNAL)) {
-            ngx_processes[i].exiting = 1;
-        }
-    }
-}
-
-#endif
-
-
 void ngx_respawn_processes(ngx_cycle_t *cycle)
 {
     ngx_uint_t  i;
diff --git a/src/os/unix/ngx_process.h b/src/os/unix/ngx_process.h
index 62c6b90..7ec558a 100644
--- a/src/os/unix/ngx_process.h
+++ b/src/os/unix/ngx_process.h
@@ -42,7 +42,7 @@
 ngx_pid_t ngx_spawn_process(ngx_cycle_t *cycle,
                             ngx_spawn_proc_pt proc, void *data,
                             char *name, ngx_int_t respawn);
-ngx_pid_t ngx_exec(ngx_cycle_t *cycle, ngx_exec_ctx_t *ctx);
+ngx_pid_t ngx_execute(ngx_cycle_t *cycle, ngx_exec_ctx_t *ctx);
 void ngx_respawn_processes(ngx_cycle_t *cycle);
 void ngx_process_get_status(void);
 
diff --git a/src/os/unix/ngx_process_cycle.c b/src/os/unix/ngx_process_cycle.c
index 8e8bec6..6ee6c9a 100644
--- a/src/os/unix/ngx_process_cycle.c
+++ b/src/os/unix/ngx_process_cycle.c
@@ -95,7 +95,7 @@
                 if (ngx_modules[i]->init_process) {
                     if (ngx_modules[i]->init_process(cycle) == NGX_ERROR) {
                         /* fatal */
-                        exit(1);
+                        exit(2);
                     }
                 }
             }
@@ -418,7 +418,7 @@
         if (ngx_modules[i]->init_process) {
             if (ngx_modules[i]->init_process(cycle) == NGX_ERROR) {
                 /* fatal */
-                exit(1);
+                exit(2);
             }
         }
     }
@@ -429,7 +429,7 @@
 
     if (ngx_init_threads(5, 128 * 1024 * 1024, cycle) == NGX_ERROR) {
         /* fatal */
-        exit(1);
+        exit(2);
     }
 
     for (i = 0; i < 1; i++) {
@@ -437,7 +437,7 @@
                               cycle, cycle->log) != 0)
         {
             /* fatal */
-            exit(1);
+            exit(2);
         }
     }
 
@@ -494,8 +494,23 @@
 {
     ngx_cycle_t *cycle = data;
 
+    ngx_err_t       err;
+    sigset_t        set;
     struct timeval  tv;
 
+    sigfillset(&set);
+    sigdelset(&set, SIGALRM);
+    sigdelset(&set, ngx_signal_value(NGX_TERMINATE_SIGNAL));
+    sigdelset(&set, ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
+
+    err = ngx_thread_sigmask(SIG_BLOCK, &set, NULL);
+    if (err) {
+        ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
+                      ngx_thread_sigmask_n " failed");
+        return 1;
+    }
+
+
     /* STUB */
 
     ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, ngx_errno,
diff --git a/src/os/unix/ngx_thread.h b/src/os/unix/ngx_thread.h
index a85750d..841636a 100644
--- a/src/os/unix/ngx_thread.h
+++ b/src/os/unix/ngx_thread.h
@@ -36,6 +36,12 @@
 } ngx_mutex_t;
 
 
+#define ngx_thread_sigmask(how, set, oset)                         \
+            (sigprocmask(how, set, oset) == -1) ? ngx_errno : 0
+
+#define ngx_thread_sigmask_n  "sigprocmask()"
+
+
 extern char    *ngx_freebsd_kern_usrstack;
 extern size_t   ngx_thread_stack_size;
 
@@ -75,6 +81,9 @@
 #define ngx_gettid()   ((ngx_int_t) pthread_getspecific(0))
 #define ngx_log_tid    ngx_thread_self()
 
+#define ngx_thread_sigmask     pthread_sigmask
+#define ngx_thread_sigmask_n  "pthread_sigmask()"
+
 #endif
 
 
diff --git a/src/os/win32/ngx_process.h b/src/os/win32/ngx_process.h
index 35d9bb9..c858768 100644
--- a/src/os/win32/ngx_process.h
+++ b/src/os/win32/ngx_process.h
@@ -21,7 +21,7 @@
 #define NGX_PROCESS_WORKER   2
 
 
-ngx_pid_t ngx_exec(ngx_cycle_t *cycle, ngx_exec_ctx_t *ctx);
+ngx_pid_t ngx_execute(ngx_cycle_t *cycle, ngx_exec_ctx_t *ctx);
 
 
 extern ngx_pid_t     ngx_pid;
diff --git a/src/os/win32/ngx_win32_config.h b/src/os/win32/ngx_win32_config.h
index 00f6426..2af600d 100644
--- a/src/os/win32/ngx_win32_config.h
+++ b/src/os/win32/ngx_win32_config.h
@@ -40,10 +40,9 @@
 #define ngx_inline   __inline
 
 
-#if 1
+#ifdef _MSC_VER
 typedef unsigned __int32  uint32_t;
-#else
-/* OWC has not __int32 */
+#else /* __WATCOMC__ */
 typedef unsigned int      uint32_t;
 #endif