diff options
Diffstat (limited to 'debian/patches/0005-include-add-lock-less-reference-counting-primitives.patch')
| -rw-r--r-- | debian/patches/0005-include-add-lock-less-reference-counting-primitives.patch | 213 |
1 files changed, 0 insertions, 213 deletions
diff --git a/debian/patches/0005-include-add-lock-less-reference-counting-primitives.patch b/debian/patches/0005-include-add-lock-less-reference-counting-primitives.patch deleted file mode 100644 index 4a4dd9dc..00000000 --- a/debian/patches/0005-include-add-lock-less-reference-counting-primitives.patch +++ /dev/null @@ -1,213 +0,0 @@ -From f6ed9ea2b93816dff52e33b71d69ed6787a57841 Mon Sep 17 00:00:00 2001 -From: Justus Winter <4winter@informatik.uni-hamburg.de> -Date: Tue, 6 May 2014 19:52:04 +0200 -Subject: [PATCH 05/15] include: add lock-less reference counting primitives - -* include/refcount.h: New file. ---- - include/refcount.h | 193 +++++++++++++++++++++++++++++++++++++++++++++++++++++ - 1 file changed, 193 insertions(+) - create mode 100644 include/refcount.h - -diff --git a/include/refcount.h b/include/refcount.h -new file mode 100644 -index 0000000..0816220 ---- /dev/null -+++ b/include/refcount.h -@@ -0,0 +1,193 @@ -+/* Lock-less reference counting primitives -+ -+ Copyright (C) 2014 Free Software Foundation, Inc. -+ -+ Written by Justus Winter <4winter@informatik.uni-hamburg.de> -+ -+ This file is part of the GNU Hurd. -+ -+ The GNU Hurd is free software; you can redistribute it and/or -+ modify it under the terms of the GNU General Public License as -+ published by the Free Software Foundation; either version 2, or (at -+ your option) any later version. -+ -+ The GNU Hurd is distributed in the hope that it will be useful, but -+ WITHOUT ANY WARRANTY; without even the implied warranty of -+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -+ General Public License for more details. -+ -+ You should have received a copy of the GNU General Public License -+ along with the GNU Hurd. If not, see <http://www.gnu.org/licenses/>. */ -+ -+#ifndef _HURD_REFCOUNT_H_ -+#define _HURD_REFCOUNT_H_ -+ -+#include <assert.h> -+#include <stdint.h> -+ -+/* Simple reference counting. */ -+ -+/* An opaque type. You must not access these values directly. */ -+typedef unsigned int refcount_t; -+ -+/* Initialize REF with REFERENCES. */ -+static inline void -+refcount_init (refcount_t *ref, unsigned int references) -+{ -+ *ref = references; -+} -+ -+/* Increment REF. Return the result of the operation. This function -+ uses atomic operations. It is not required to serialize calls to -+ this function. */ -+static inline unsigned int -+refcount_ref (refcount_t *ref) -+{ -+ unsigned int r; -+ r = __atomic_add_fetch (ref, 1, __ATOMIC_RELAXED); -+ assert (r != UINT_MAX); -+ return r; -+} -+ -+/* Decrement REF. Return the result of the operation. This function -+ uses atomic operations. It is not required to serialize calls to -+ this function. */ -+static inline unsigned int -+refcount_deref (refcount_t *ref) -+{ -+ unsigned int r; -+ r = __atomic_sub_fetch (ref, 1, __ATOMIC_RELAXED); -+ assert (r != UINT_MAX); -+ return r; -+} -+ -+/* Return REF. This function uses atomic operations. It is not -+ required to serialize calls to this function. */ -+static inline unsigned int -+refcount_references (refcount_t *ref) -+{ -+ return __atomic_load_n (ref, __ATOMIC_RELAXED); -+} -+ -+/* Reference counting with weak references. */ -+ -+/* An opaque type. You must not access these values directly. */ -+typedef union _references refcounts_t; -+ -+/* Instead, the functions manipulating refcounts_t values write the -+ results into this kind of objects. */ -+struct references { -+ uint32_t hard; -+ uint32_t weak; -+}; -+ -+/* We use a union to convert struct reference values to uint64_t which -+ we can manipulate atomically. While this behavior is not -+ guaranteed by the C standard, it is supported by all major -+ compilers. */ -+union _references { -+ struct references references; -+ uint64_t value; -+}; -+ -+/* Initialize REF with HARD and WEAK references. */ -+static inline void -+refcounts_init (refcounts_t *ref, uint32_t hard, uint32_t weak) -+{ -+ ref->references = (struct references) { .hard = hard, .weak = weak }; -+} -+ -+/* Increment the hard reference count of REF. If RESULT is not NULL, -+ the result of the operation is written there. This function uses -+ atomic operations. It is not required to serialize calls to this -+ function. */ -+static inline void -+refcounts_ref (refcounts_t *ref, struct references *result) -+{ -+ const union _references op = { .references = { .hard = 1 } }; -+ union _references r; -+ r.value = __atomic_add_fetch (&ref->value, op.value, __ATOMIC_RELAXED); -+ assert (r.references.hard != UINT32_MAX); -+ if (result) -+ *result = r.references; -+} -+ -+/* Decrement the hard reference count of REF. If RESULT is not NULL, -+ the result of the operation is written there. This function uses -+ atomic operations. It is not required to serialize calls to this -+ function. */ -+static inline void -+refcounts_deref (refcounts_t *ref, struct references *result) -+{ -+ const union _references op = { .references = { .hard = 1 } }; -+ union _references r; -+ r.value = __atomic_sub_fetch (&ref->value, op.value, __ATOMIC_RELAXED); -+ assert (r.references.hard != UINT32_MAX); -+ if (result) -+ *result = r.references; -+} -+ -+/* Increment the weak reference count of REF. If RESULT is not NULL, -+ the result of the operation is written there. This function uses -+ atomic operations. It is not required to serialize calls to this -+ function. */ -+static inline void -+refcounts_ref_weak (refcounts_t *ref, struct references *result) -+{ -+ const union _references op = { .references = { .weak = 1 } }; -+ union _references r; -+ r.value = __atomic_add_fetch (&ref->value, op.value, __ATOMIC_RELAXED); -+ assert (r.references.weak != UINT32_MAX); -+ if (result) -+ *result = r.references; -+} -+ -+/* Decrement the weak reference count of REF. If RESULT is not NULL, -+ the result of the operation is written there. This function uses -+ atomic operations. It is not required to serialize calls to this -+ function. */ -+static inline void -+refcounts_deref_weak (refcounts_t *ref, struct references *result) -+{ -+ const union _references op = { .references = { .weak = 1 } }; -+ union _references r; -+ r.value = __atomic_sub_fetch (&ref->value, op.value, __ATOMIC_RELAXED); -+ assert (r.references.weak != UINT32_MAX); -+ if (result) -+ *result = r.references; -+} -+ -+/* Store the current reference counts of REF in RESULT. This function -+ uses atomic operations. It is not required to serialize calls to -+ this function. */ -+static inline void -+refcounts_references (refcounts_t *ref, struct references *result) -+{ -+ union _references r; -+ r.value =__atomic_load_n (&ref->value, __ATOMIC_RELAXED); -+ *result = r.references; -+} -+ -+/* Return the hard reference count of REF. This function uses atomic -+ operations. It is not required to serialize calls to this -+ function. */ -+static inline uint32_t -+refcounts_hard_references (refcounts_t *ref) -+{ -+ struct references result; -+ refcounts_references (ref, &result); -+ return result.hard; -+} -+ -+/* Return the weak reference count of REF. This function uses atomic -+ operations. It is not required to serialize calls to this -+ function. */ -+static inline uint32_t -+refcounts_weak_references (refcounts_t *ref) -+{ -+ struct references result; -+ refcounts_references (ref, &result); -+ return result.weak; -+} -+ -+#endif /* _HURD_REFCOUNT_H_ */ --- -2.0.0.rc0 - |