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[PATCH hurd] mach-defpager: use protected payloads for object lookups
From: |
Justus Winter |
Subject: |
[PATCH hurd] mach-defpager: use protected payloads for object lookups |
Date: |
Sat, 25 Oct 2014 15:28:00 +0200 |
* mach-defpager/default_pager.c (pager_port_list_insert): Set
protected payload.
(pager_port_list_delete): Clear protected payload.
* mach-defpager/mig-decls.h (begin_using_default_pager_payload): New
function.
* mach-defpager/mig-mutate.h: Add mutator.
---
mach-defpager/default_pager.c | 9 +++++++++
mach-defpager/mig-decls.h | 6 ++++++
mach-defpager/mig-mutate.h | 3 +++
3 files changed, 18 insertions(+)
diff --git a/mach-defpager/default_pager.c b/mach-defpager/default_pager.c
index d40a9c9..831ed96 100644
--- a/mach-defpager/default_pager.c
+++ b/mach-defpager/default_pager.c
@@ -1803,6 +1803,12 @@ void pager_port_list_insert(port, ds)
(hurd_ihash_key_t) port,
(hurd_ihash_value_t) ds);
pthread_mutex_unlock(&all_pagers.lock);
+
+ /* Try to set a protected payload. This is an optimization,
+ if it fails we degrade gracefully. */
+ mach_port_set_protected_payload (mach_task_self (),
+ port,
+ (unsigned long) ds);
}
void pager_port_list_delete(ds)
@@ -1812,6 +1818,9 @@ void pager_port_list_delete(ds)
hurd_ihash_locp_remove (&all_pagers.htable,
ds->htable_locp);
pthread_mutex_unlock(&all_pagers.lock);
+
+ mach_port_clear_protected_payload (mach_task_self (),
+ ds->pager);
}
/*
diff --git a/mach-defpager/mig-decls.h b/mach-defpager/mig-decls.h
index 8118d61..3357aa2 100644
--- a/mach-defpager/mig-decls.h
+++ b/mach-defpager/mig-decls.h
@@ -31,4 +31,10 @@ begin_using_default_pager (mach_port_t port)
(hurd_ihash_key_t) port);
}
+static inline struct dstruct * __attribute__ ((unused))
+begin_using_default_pager_payload (unsigned long payload)
+{
+ return (default_pager_t) payload;
+}
+
#endif /* __MACH_DEFPAGER_MIG_DECLS_H__ */
diff --git a/mach-defpager/mig-mutate.h b/mach-defpager/mig-mutate.h
index 54aeeba..31acaa6 100644
--- a/mach-defpager/mig-mutate.h
+++ b/mach-defpager/mig-mutate.h
@@ -18,5 +18,8 @@
along with the GNU Hurd. If not, see <http://www.gnu.org/licenses/>. */
#define MEMORY_OBJECT_INTRAN default_pager_t begin_using_default_pager
(mach_port_t)
+#define MEMORY_OBJECT_INTRAN_PAYLOAD \
+ default_pager_t begin_using_default_pager_payload
+
#define MEMORY_OBJECT_IMPORTS import "mig-decls.h";
#define DEFAULT_PAGER_IMPORTS import "mig-decls.h";
--
2.1.1