xnu-2422.110.17.tar.gz

[apple/xnu.git] / bsd / kern / kern_shutdown.c

diff --git a/bsd/kern/kern_shutdown.c b/bsd/kern/kern_shutdown.c
index f8984bb3c903531edb3fa6c5482be3988fa74415..4e231826d10c3f69483503ff52206ed97c2332af 100644 (file)
--- a/bsd/kern/kern_shutdown.c
+++ b/bsd/kern/kern_shutdown.c
@@ -67,16 +67,16 @@
 #include <mach/task.h>                 /* for task_suspend() */
 #include <sys/sysproto.h>              /* abused for sync() */
 #include <kern/clock.h>                        /* for delay_for_interval() */
+#include <libkern/OSAtomic.h>
 
 #include <sys/kdebug.h>
 
-int system_inshutdown = 0;
+uint32_t system_inshutdown = 0;
 
 /* XXX should be in a header file somewhere, but isn't */
 extern void md_prepare_for_shutdown(int, int, char *);
 extern void (*unmountroot_pre_hook)(void);
 
-int    waittime = -1;
 unsigned int proc_shutdown_exitcount = 0;
 
 static int  sd_openlog(vfs_context_t);
@@ -109,37 +109,34 @@ static int  sd_callback1(proc_t p, void * arg);
 static int  sd_callback2(proc_t p, void * arg);
 static int  sd_callback3(proc_t p, void * arg);
 
-void
+int
 boot(int paniced, int howto, char *command)
 {
        struct proc *p = current_proc();        /* XXX */
        int hostboot_option=0;
-       int funnel_state;
 
-       system_inshutdown = 1;
-
-       funnel_state = thread_funnel_set(kernel_flock, TRUE);
-
-       /*
-       * Temporary hack to notify the power management root domain
-       * that the system will shut down.
-       */
+       if (!OSCompareAndSwap(0, 1, &system_inshutdown)) {
+               if ( (howto&RB_QUICK) == RB_QUICK)
+                       goto force_reboot;
+               return (EBUSY);
+       }
+       /*
+        * Temporary hack to notify the power management root domain
+        * that the system will shut down.
+        */
        IOSystemShutdownNotification();
 
        md_prepare_for_shutdown(paniced, howto, command);
 
-       if ((howto&RB_QUICK)==RB_QUICK && waittime < 0) {
-               waittime = 0;
+       if ((howto&RB_QUICK)==RB_QUICK) {
                printf("Quick reboot...\n");
                if ((howto&RB_NOSYNC)==0) {
                        sync(p, (void *)NULL, (int *)NULL);
                }
        }
-       else if ((howto&RB_NOSYNC)==0 && waittime < 0) {
+       else if ((howto&RB_NOSYNC)==0) {
                int iter, nbusy;
 
-               waittime = 0;
-               
                printf("syncing disks... ");
 
                /*
@@ -150,7 +147,7 @@ boot(int paniced, int howto, char *command)
                proc_shutdown();
 
 #if CONFIG_AUDIT
-               audit_shutdown();
+               audit_shutdown();
 #endif
 
                if (unmountroot_pre_hook != NULL)
@@ -162,7 +159,7 @@ boot(int paniced, int howto, char *command)
                 * Now that all processes have been terminated and system is
                 * sync'ed up, suspend init
                 */
-
+                       
                if (initproc && p != initproc)
                        task_suspend(initproc->task);
 
@@ -187,7 +184,6 @@ boot(int paniced, int howto, char *command)
                else
                        printf("done\n");
        }
-
 #if NETWORKING
        /*
         * Can't just use an splnet() here to disable the network
@@ -197,6 +193,7 @@ boot(int paniced, int howto, char *command)
        if_down_all();
 #endif /* NETWORKING */
 
+force_reboot:
        if (howto & RB_POWERDOWN)
                hostboot_option = HOST_REBOOT_HALT;
        if (howto & RB_HALT)
@@ -204,13 +201,15 @@ boot(int paniced, int howto, char *command)
        if (paniced == RB_PANIC)
                hostboot_option = HOST_REBOOT_HALT;
 
-    if (howto & RB_UPSDELAY) {
-        hostboot_option = HOST_REBOOT_UPSDELAY;
-    }
+       if (howto & RB_UPSDELAY) {
+               hostboot_option = HOST_REBOOT_UPSDELAY;
+       }
 
        host_reboot(host_priv_self(), hostboot_option);
-
-       thread_funnel_set(kernel_flock, FALSE);
+       /*
+        * should not be reached
+        */
+       return (0);
 }
 
 static int