Displaying 1 result from an estimated 1 matches for "gnttab_sem".
2007 Nov 26
0
[PATCH] [Mini-OS] Make gnttab allocation/free safe
...-18,6 +18,7 @@
#include <os.h>
#include <mm.h>
#include <gnttab.h>
+#include <semaphore.h>
#define NR_RESERVED_ENTRIES 8
@@ -31,20 +32,29 @@
static grant_entry_t *gnttab_table;
static grant_ref_t gnttab_list[NR_GRANT_ENTRIES];
+static __DECLARE_SEMAPHORE_GENERIC(gnttab_sem, NR_GRANT_ENTRIES);
static void
put_free_entry(grant_ref_t ref)
{
+ unsigned long flags;
+ local_irq_save(flags);
gnttab_list[ref] = gnttab_list[0];
gnttab_list[0] = ref;
-
+ local_irq_restore(flags);
+ up(&gnttab_sem);
}
static grant_ref_t
get_free_entry(void)...