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Google Keyword Rankings for : cmpxchg example
1
cmpxchg example for 64 bit integer - Stack Overflow
https://stackoverflow.com/questions/833122/cmpxchg-example-for-64-bit-integer
CMPXCHG can be used to try to intercept a semaphore, i.e. test if its state is free, and if so, load a new value into the semaphore, making its state busy. The ...
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https://stackoverflow.com/questions/833122/cmpxchg-example-for-64-bit-integer
CMPXCHG can be used to try to intercept a semaphore, i.e. test if its state is free, and if so, load a new value into the semaphore, making its state busy. The ...
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2
CMPXCHG — Compare and Exchange
https://www.felixcloutier.com/x86/cmpxchg
Else, clear ZF and load r/m32 into EAX. REX.W + 0F B1/r CMPXCHG r/m64, r64, MR, Valid, N.E., Compare RAX with r/m64.
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https://www.felixcloutier.com/x86/cmpxchg
Else, clear ZF and load r/m32 into EAX. REX.W + 0F B1/r CMPXCHG r/m64, r64, MR, Valid, N.E., Compare RAX with r/m64.
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3
CMPXCHG--Compare and Exchange
http://www.jaist.ac.jp/iscenter-new/mpc/altix/altixdata/opt/intel/vtune/doc/users_guide/mergedProjects/analyzer_ec/mergedProjects/reference_olh/mergedProjects/instructions/instruct32_hh/vc42.htm
This instruction can be used with a LOCK prefix to allow the instruction to be executed atomically. To simplify the interface to the processor's bus, the ...
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http://www.jaist.ac.jp/iscenter-new/mpc/altix/altixdata/opt/intel/vtune/doc/users_guide/mergedProjects/analyzer_ec/mergedProjects/reference_olh/mergedProjects/instructions/instruct32_hh/vc42.htm
This instruction can be used with a LOCK prefix to allow the instruction to be executed atomically. To simplify the interface to the processor's bus, the ...
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4
CMPXCHG - Microprocessors@BITS - Google Sites
https://sites.google.com/site/microprocessorsbits/data-transfer/cmpxchg
This instruction compares the accumulator (AL/AX/EAX) (8-32 bits) with the operand "dest". If equal the "dest" is loaded with the operand "src", ...
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https://sites.google.com/site/microprocessorsbits/data-transfer/cmpxchg
This instruction compares the accumulator (AL/AX/EAX) (8-32 bits) with the operand "dest". If equal the "dest" is loaded with the operand "src", ...
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5
0xsirus/cmpxchg-exmaple: This is an example to ... - GitHub
https://github.com/cyrus-sh/cmpxchg-exmaple
This is an example to demonstrate how you can use the Intel's "cmpxchg" instruction to implement a lock - GitHub - 0xsirus/cmpxchg-exmaple: This is an ...
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https://github.com/cyrus-sh/cmpxchg-exmaple
This is an example to demonstrate how you can use the Intel's "cmpxchg" instruction to implement a lock - GitHub - 0xsirus/cmpxchg-exmaple: This is an ...
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6
Lockless patterns: an introduction to compare-and-swap
https://lwn.net/Articles/847973/
Instead of using a lock, cmpxchg() lets us catch the other thread in the ... pair such as the one we saw in the first article, for example.
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https://lwn.net/Articles/847973/
Instead of using a lock, cmpxchg() lets us catch the other thread in the ... pair such as the one we saw in the first article, for example.
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7
That example is based on "lock cmpxchg" (x86 compare-and ...
https://news.ycombinator.com/item?id=20112998
That example is based on "lock cmpxchg" (x86 compare-and-swap). Not on atomic swap, like what "xchg" based one [0] above does.
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https://news.ycombinator.com/item?id=20112998
That example is based on "lock cmpxchg" (x86 compare-and-swap). Not on atomic swap, like what "xchg" based one [0] above does.
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8
Part 1 – Fine-grained Operations The value is only updated ...
http://15418.courses.cs.cmu.edu/fall2016content/uploads/lec18_lock_handout_sln.pdf
As we learned on Monday, CMPXCHG can be used to implement other primitives, ... Q3) Give an example of a simple C operation that needs locking.
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http://15418.courses.cs.cmu.edu/fall2016content/uploads/lec18_lock_handout_sln.pdf
As we learned on Monday, CMPXCHG can be used to implement other primitives, ... Q3) Give an example of a simple C operation that needs locking.
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9
Lecture 22 - CS 61
https://cs61.seas.harvard.edu/wiki/images/9/92/CS61ScribeNotesLecture23.pdf
Example: we have two threads, with int x = y = 0. ... The compare and exchange instruction (cmpxchg): ... Implementing a lock using cmpxchg:.
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https://cs61.seas.harvard.edu/wiki/images/9/92/CS61ScribeNotesLecture23.pdf
Example: we have two threads, with int x = y = 0. ... The compare and exchange instruction (cmpxchg): ... Implementing a lock using cmpxchg:.
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10
lock cmpxchg %edx, cmos_lock prefix opcode source ...
https://www.cs.usfca.edu/~cruse/cs635/lesson09.ppt
Example: 'cmpxchg'. Operation of the 'cmpxchg' instruction is described (on 3 pages) in Volume 2A; There's an English-sentence description, ...
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https://www.cs.usfca.edu/~cruse/cs635/lesson09.ppt
Example: 'cmpxchg'. Operation of the 'cmpxchg' instruction is described (on 3 pages) in Volume 2A; There's an English-sentence description, ...
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11
CMPXCHG - Intel Instruction Set
https://web.itu.edu.tr/kesgin/mul06/intel/instr/cmpxchg.html
CMPXCHG - Compare and Exchange Usage: CMPXCHG dest,src (486+) Modifies flags: AF CF OF PF SF ZF Compares the accumulator (8-32 bits) with dest.
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https://web.itu.edu.tr/kesgin/mul06/intel/instr/cmpxchg.html
CMPXCHG - Compare and Exchange Usage: CMPXCHG dest,src (486+) Modifies flags: AF CF OF PF SF ZF Compares the accumulator (8-32 bits) with dest.
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12
x86 Assembly/Data Transfer - Wikibooks, open books for an ...
https://en.wikibooks.org/wiki/X86_Assembly/Data_Transfer
The following example shows how to use the cmpxchg instruction to create a spin lock which will be used to protect the result variable.
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https://en.wikibooks.org/wiki/X86_Assembly/Data_Transfer
The following example shows how to use the cmpxchg instruction to create a spin lock which will be used to protect the result variable.
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13
[PATCH v4 0/4] riscv: Add qspinlock/qrwlock - Mailing List
https://lore.kernel.org/lkml/1706037.TLkxdtWsSY@rata/t/
Obviously they're not sharing code like they should be :/ See for example arch/mips/kernel/cmpxchg.c. Also, I really do think doing ticket locks first is a ...
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https://lore.kernel.org/lkml/1706037.TLkxdtWsSY@rata/t/
Obviously they're not sharing code like they should be :/ See for example arch/mips/kernel/cmpxchg.c. Also, I really do think doing ticket locks first is a ...
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14
arch/x86/include/asm/cmpxchg.h - Linux source code (v6.0.9)
https://elixir.bootlin.com/linux/latest/source/arch/x86/include/asm/cmpxchg.h
› linux › latest › cmpxchg
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https://elixir.bootlin.com/linux/latest/source/arch/x86/include/asm/cmpxchg.h
› linux › latest › cmpxchg
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15
David Smith on Twitter: "As an example, uncontended ObjC ...
https://mobile.twitter.com/catfish_man/status/1318649599071047684
Is GC also cmpxchg-bound? ... As an example, uncontended ObjC reference counting is ~5x faster on modern Apple ARM than it is on modern Intel.
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https://mobile.twitter.com/catfish_man/status/1318649599071047684
Is GC also cmpxchg-bound? ... As an example, uncontended ObjC reference counting is ~5x faster on modern Apple ARM than it is on modern Intel.
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16
LLVM Atomic Instructions and Concurrency Guide
https://llvm.org/docs/Atomics.html
(This example is particularly of interest because before the concurrency model ... cmpxchg and atomicrmw are essentially like an atomic load followed by an ...
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https://llvm.org/docs/Atomics.html
(This example is particularly of interest because before the concurrency model ... cmpxchg and atomicrmw are essentially like an atomic load followed by an ...
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17
CSE 120 Discussion Notes: Week 4
https://cseweb.ucsd.edu/~mvrable/cse120-wi07/week4-notes.html
Lock-Free Data Structures with CMPXCHG ... Here's a simple example: we'll implement a linked list and give it stack operations: push an item onto the list ...
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https://cseweb.ucsd.edu/~mvrable/cse120-wi07/week4-notes.html
Lock-Free Data Structures with CMPXCHG ... Here's a simple example: we'll implement a linked list and give it stack operations: push an item onto the list ...
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18
C++ (Cpp) cmpxchg Examples - HotExamples
https://cpp.hotexamples.com/examples/-/-/cmpxchg/cpp-cmpxchg-function-examples.html
C++ (Cpp) cmpxchg - 30 examples found. These are the top rated real world C++ (Cpp) examples of cmpxchg extracted from open source projects.
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https://cpp.hotexamples.com/examples/-/-/cmpxchg/cpp-cmpxchg-function-examples.html
C++ (Cpp) cmpxchg - 30 examples found. These are the top rated real world C++ (Cpp) examples of cmpxchg extracted from open source projects.
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19
__atomic Builtins (Using the GNU Compiler Collection (GCC))
https://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
› onlinedocs › gcc
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https://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
› onlinedocs › gcc
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20
_InterlockedCompareExchange1...
https://learn.microsoft.com/en-us/cpp/intrinsics/interlockedcompareexchange128
Syntax; Return value; Requirements; Remarks; Example; See also. Microsoft Specific. Performs a 128-bit interlocked compare and exchange.
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https://learn.microsoft.com/en-us/cpp/intrinsics/interlockedcompareexchange128
Syntax; Return value; Requirements; Remarks; Example; See also. Microsoft Specific. Performs a 128-bit interlocked compare and exchange.
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21
InterlockedExchange implementation
https://comp.os.ms-windows.programmer.win32.narkive.com/JPXHtrRg/interlockedexchange-implementation
lock cmpxchg dword ptr [ecx], edx ... Read the documentation on CMPXCHG; it is an instruction different ... Here is an example of that:
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https://comp.os.ms-windows.programmer.win32.narkive.com/JPXHtrRg/interlockedexchange-implementation
lock cmpxchg dword ptr [ecx], edx ... Read the documentation on CMPXCHG; it is an instruction different ... Here is an example of that:
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22
3D Assembly of Universal Joint - SolveSpace - Forum
https://solvespace.com/forum.pl?action=viewthread&parent=4523&tt=1651975342
Following cmpxchg's example, here's a little parallel platform kinematic I made. It's not a super stable linkage.
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https://solvespace.com/forum.pl?action=viewthread&parent=4523&tt=1651975342
Following cmpxchg's example, here's a little parallel platform kinematic I made. It's not a super stable linkage.
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23
X86ISA - X86-cmpxchg - UT Computer Science
https://www.cs.utexas.edu/users/moore/acl2/manuals/current/manual/index-seo.php/X86ISA____X86-CMPXCHG
X86-cmpxchg. Signature; (x86-cmpxchg proc-mode start-rip temp-rip prefixes rex-byte opcode modr/m sib x86) → x86; Returns: x86 — Type (x86p x86) , given ...
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https://www.cs.utexas.edu/users/moore/acl2/manuals/current/manual/index-seo.php/X86ISA____X86-CMPXCHG
X86-cmpxchg. Signature; (x86-cmpxchg proc-mode start-rip temp-rip prefixes rex-byte opcode modr/m sib x86) → x86; Returns: x86 — Type (x86p x86) , given ...
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24
Operating System Engineering, Lecture 21
https://ocw.mit.edu/courses/6-828-operating-system-engineering-fall-2012/d8d03983cf031d08000ac92e1ddc395e_MIT6_828F12_lec21_notes.pdf
cmpxchg can be used to implement locks, but we can also use it directly for concurrent, correct access to the linked list. example: concurrent stack with ...
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https://ocw.mit.edu/courses/6-828-operating-system-engineering-fall-2012/d8d03983cf031d08000ac92e1ddc395e_MIT6_828F12_lec21_notes.pdf
cmpxchg can be used to implement locks, but we can also use it directly for concurrent, correct access to the linked list. example: concurrent stack with ...
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25
Compare and Exchange (cmpxchg)[486]
https://docs.oracle.com/cd/E19455-01/806-3773/instructionset-95/index.html
Compare and Exchange (cmpxchg)[486]. cmpxchg{bwl} reg[8|16|32], r/m[8|16|32]. Example. cmpxchgb %cl, 1(%esi) cmpxchgl %edx, 4(%edi).
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https://docs.oracle.com/cd/E19455-01/806-3773/instructionset-95/index.html
Compare and Exchange (cmpxchg)[486]. cmpxchg{bwl} reg[8|16|32], r/m[8|16|32]. Example. cmpxchgb %cl, 1(%esi) cmpxchgl %edx, 4(%edi).
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26
Library iris.heap_lang.lib.atomic_heap
https://plv.mpi-sws.org/coqdoc/iris/iris.heap_lang.lib.atomic_heap.html
For example: Context `{!heapGS_gen hlc Σ, ... cmpxchg : val; mapsto (l : loc) (dq: dfrac) (v ... Local Notation CAS e1 e2 e3 := (Snd (cmpxchg e1 e2 e3)).
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https://plv.mpi-sws.org/coqdoc/iris/iris.heap_lang.lib.atomic_heap.html
For example: Context `{!heapGS_gen hlc Σ, ... cmpxchg : val; mapsto (l : loc) (dq: dfrac) (v ... Local Notation CAS e1 e2 e3 := (Snd (cmpxchg e1 e2 e3)).
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27
C/C++11 mappings to processors
https://www.cl.cam.ac.uk/~pes20/cpp/cpp0xmappings.html
A good example of this approach is Doug Lea's cookbook for JVM compiler ... For the non-SC and non-cmpxchg operations, the translation to ARM is very ...
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https://www.cl.cam.ac.uk/~pes20/cpp/cpp0xmappings.html
A good example of this approach is Doug Lea's cookbook for JVM compiler ... For the non-SC and non-cmpxchg operations, the translation to ARM is very ...
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28
AtomicExpandPass.cpp - Apple Open Source
https://opensource.apple.com/source/clang/clang-700.1.76/src/lib/CodeGen/AtomicExpandPass.cpp.auto.html
For example, the only 64-bit load guaranteed // to be single-copy atomic by ... %loop ] // %new = some_op iN %loaded, %incr // %pair = cmpxchg iN* %addr, ...
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https://opensource.apple.com/source/clang/clang-700.1.76/src/lib/CodeGen/AtomicExpandPass.cpp.auto.html
For example, the only 64-bit load guaranteed // to be single-copy atomic by ... %loop ] // %new = some_op iN %loaded, %incr // %pair = cmpxchg iN* %addr, ...
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29
Adaptive optimized compare-exchange operation
https://patents.google.com/patent/US8601242B2/en
The CMPXCHG (Compare-Exchange) operation is commonly used as one instruction ... For example, if a value in a specific location in memory is loaded into a ...
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https://patents.google.com/patent/US8601242B2/en
The CMPXCHG (Compare-Exchange) operation is commonly used as one instruction ... For example, if a value in a specific location in memory is loaded into a ...
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30
Documentation/atomic_t.txt - kernel/common - Git at Google
https://android.googlesource.com/kernel/common/+/refs/heads/android-mainline/Documentation/atomic_t.txt
given the interface, normally be implemented using (try_)cmpxchg loops but. are time critical and can, (typically) on ... For example our TSO architectures.
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https://android.googlesource.com/kernel/common/+/refs/heads/android-mainline/Documentation/atomic_t.txt
given the interface, normally be implemented using (try_)cmpxchg loops but. are time critical and can, (typically) on ... For example our TSO architectures.
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31
Compare-and-swap - Wikipedia
https://en.wikipedia.org/wiki/Compare-and-swap
In computer science, compare-and-swap (CAS) is an atomic instruction used in multithreading ... 1.1 Example application: atomic adder; 1.2 ABA problem ...
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https://en.wikipedia.org/wiki/Compare-and-swap
In computer science, compare-and-swap (CAS) is an atomic instruction used in multithreading ... 1.1 Example application: atomic adder; 1.2 ABA problem ...
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32
Locking Primitives and Memory Ordering on the Ampere Altra ...
https://solutions.amperecomputing.com/tuning-guides/locking-primitives-and-memory-ordering
Examples are pthread_mutex_lock and pthread_rwlock. ... For example, the cmpxchg instruction set has versions to acquire (CASA instruction), ...
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https://solutions.amperecomputing.com/tuning-guides/locking-primitives-and-memory-ordering
Examples are pthread_mutex_lock and pthread_rwlock. ... For example, the cmpxchg instruction set has versions to acquire (CASA instruction), ...
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33
mongoc_collection_find_and_m...
http://mongoc.org/libmongoc/current/mongoc_collection_find_and_modify.html
... mongoc_client_t *client; const char *uri_string = "mongodb://127.0.0.1:27017/?appname=find-and-modify-example"; mongoc_uri_t *uri; bson_error_t error; ...
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http://mongoc.org/libmongoc/current/mongoc_collection_find_and_modify.html
... mongoc_client_t *client; const char *uri_string = "mongodb://127.0.0.1:27017/?appname=find-and-modify-example"; mongoc_uri_t *uri; bson_error_t error; ...
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34
Example POWER Implementation for C/C++ ... - open-std.org
https://open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2745.html
Cmpxchg Release,Relaxed, lwsync; ldarx; cmp; bc _exit; stcwx; bc _loop ... For example, a processor may update a location several times ...
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https://open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2745.html
Cmpxchg Release,Relaxed, lwsync; ldarx; cmp; bc _exit; stcwx; bc _loop ... For example, a processor may update a location several times ...
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35
DWCAS in C++ - timur.audio
https://timur.audio/dwcas-in-c
I'm not going to go into details about specific data structures here, as this is not the purpose of this blog post (for an example, ...
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https://timur.audio/dwcas-in-c
I'm not going to go into details about specific data structures here, as this is not the purpose of this blog post (for an example, ...
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36
cmpxchg, LL/SC, and portability (Al Viro; Linus Torvalds)
https://yarchive.net/comp/linux/cmpxchg_ll_sc_portability.html
That said, cmpxchg won't necessarily be "high-performance" unless the hw ... that a ld.l and st.c cannot have a taken branch in between then, for example.
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https://yarchive.net/comp/linux/cmpxchg_ll_sc_portability.html
That said, cmpxchg won't necessarily be "high-performance" unless the hw ... that a ld.l and st.c cannot have a taken branch in between then, for example.
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37
AMD64 Architecture Programmer's Manual, Volume 1
https://www.amd.com/system/files/TechDocs/24592.pdf
register (DS in this example) is combined with the offset contained in the ... Compare and exchange instructions (CMPXCHG) use the AL or rAX register for ...
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https://www.amd.com/system/files/TechDocs/24592.pdf
register (DS in this example) is combined with the offset contained in the ... Compare and exchange instructions (CMPXCHG) use the AL or rAX register for ...
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38
Example POWER Implementation for C/C++ Memory Model
http://www.rdrop.com/~paulmck/scalability/paper/N2745r.2011.03.04a.html
Weak cmpxchg sequences could omit the backwards branch to _loop . There is some confusion surrounding the hwsync and lwsync opcodes, due to the ...
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http://www.rdrop.com/~paulmck/scalability/paper/N2745r.2011.03.04a.html
Weak cmpxchg sequences could omit the backwards branch to _loop . There is some confusion surrounding the hwsync and lwsync opcodes, due to the ...
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39
KVM Lock Overview — The Linux Kernel 5.10.0 ... - No comment
https://www.infradead.org/~mchehab/kernel_docs/virt/kvm/locking.html
The mapping from gfn to pfn may be changed since we can only ensure the pfn is not changed during cmpxchg. This is a ABA problem, for example, below case ...
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https://www.infradead.org/~mchehab/kernel_docs/virt/kvm/locking.html
The mapping from gfn to pfn may be changed since we can only ensure the pfn is not changed during cmpxchg. This is a ABA problem, for example, below case ...
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40
Intel 64 and IA-32 Architectures Software Developer's Manual
https://cdrdv2-public.intel.com/671110/325383-sdm-vol-2abcd.pdf
CMPXCHG—Compare and Exchange. ... Opcode Look-up Examples Using Opcode Extensions. ... Opcode Look-up Examples for Escape Instruction Opcodes .
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https://cdrdv2-public.intel.com/671110/325383-sdm-vol-2abcd.pdf
CMPXCHG—Compare and Exchange. ... Opcode Look-up Examples Using Opcode Extensions. ... Opcode Look-up Examples for Escape Instruction Opcodes .
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41
[RFC PATCH 05/15] Provide atomic64_t and atomic_long_t ...
https://groups.google.com/g/linux.kernel/c/nWADtFTM5Jo/m/F7QWMj3GNwAJ
On x86, for example, the CMPXCHG instruction sticks this value into the Z flag and using the bool return allows the compiler to use this value directly.
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https://groups.google.com/g/linux.kernel/c/nWADtFTM5Jo/m/F7QWMj3GNwAJ
On x86, for example, the CMPXCHG instruction sticks this value into the Z flag and using the bool return allows the compiler to use this value directly.
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42
Analysis of Cmpxchg function of Linux Kernel
https://topic.alibabacloud.com/a/analysis-of-cmpxchg-function-of-linux-kernel_1_16_30212096.html
Recently saw the Linux Kernel Cmpxchg code, the implementation very ... Take CMPXCHG compilation as an example, (__ret) corresponds to 0, ...
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https://topic.alibabacloud.com/a/analysis-of-cmpxchg-function-of-linux-kernel_1_16_30212096.html
Recently saw the Linux Kernel Cmpxchg code, the implementation very ... Take CMPXCHG compilation as an example, (__ret) corresponds to 0, ...
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43
Query Example | NoSQL Database Demo
https://demo.ravendb.net/demos/csharp/queries/query-example
This demo is an example of a Query with Combined Features. The query results will be: 5 (or less) projected EmployeeDetails entities that match the filterin ...
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https://demo.ravendb.net/demos/csharp/queries/query-example
This demo is an example of a Query with Combined Features. The query results will be: 5 (or less) projected EmployeeDetails entities that match the filterin ...
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44
Multi-processor coordination without locks - CSE, IIT Delhi
https://www.cse.iitd.ac.in/~sbansal/os/lec/l38.html
Case study: An example on non-linear effects of scheduling: "Receive livelocks ... void push(struct element *e) { do { e->next = top; } while (cmpxchg(&top, ...
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https://www.cse.iitd.ac.in/~sbansal/os/lec/l38.html
Case study: An example on non-linear effects of scheduling: "Receive livelocks ... void push(struct element *e) { do { e->next = top; } while (cmpxchg(&top, ...
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45
Inline Assembly - OSDev Wiki
https://wiki.osdev.org/Inline_Assembly
In the example above, we move a to eax in the first instruction, ... One example where this can be useful, is the CMPXCHG instruction (see ...
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https://wiki.osdev.org/Inline_Assembly
In the example above, we move a to eax in the first instruction, ... One example where this can be useful, is the CMPXCHG instruction (see ...
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46
Simple binary semaphore based on the CMPXCHG instruction
https://www.freebasic.net/forum/viewtopic.php?t=22608
Wrapped in a modified version of the mutex example: ... Operation of CMPXCHG DEST, SRC with 32-bit operands: '' IF EAX = DEST THEN '' ZF = 1 ...
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https://www.freebasic.net/forum/viewtopic.php?t=22608
Wrapped in a modified version of the mutex example: ... Operation of CMPXCHG DEST, SRC with 32-bit operands: '' IF EAX = DEST THEN '' ZF = 1 ...
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47
x86 Assembly - Shichao's Notes
https://notes.shichao.io/asm/
For example, 'EAX'. ... For example, CL is the LSB of the counter register, whereas CH is its MSB. The following table summarizes ... cmpxchg arg2, arg1.
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https://notes.shichao.io/asm/
For example, 'EAX'. ... For example, CL is the LSB of the counter register, whereas CH is its MSB. The following table summarizes ... cmpxchg arg2, arg1.
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48
Is x86 CMPXCHG atomic, if so why does it need L...anycodings
https://www.anycodings.com/1questions/2119414/is-x86-cmpxchg-atomic-if-so-why-does-it-need-lock
For example, the Linux kernel is anycodings_compare-and-swap normally compiled with SMP support, so anycodings_compare-and-swap it uses lock cmpxchg for ...
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https://www.anycodings.com/1questions/2119414/is-x86-cmpxchg-atomic-if-so-why-does-it-need-lock
For example, the Linux kernel is anycodings_compare-and-swap normally compiled with SMP support, so anycodings_compare-and-swap it uses lock cmpxchg for ...
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49
CMPXCHG: Compare and Exchange (x86 Instruction Set ...
https://c9x.me/x86/html/file_module_x86_id_41.html
Opcode, Mnemonic, Description. 0F B0 /r, CMPXCHG r/m8,r8, Compare AL with r/m8. If equal, ZF is set and r8 is loaded into r/m8. Else, clear ZF and load r/m8 ...
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https://c9x.me/x86/html/file_module_x86_id_41.html
Opcode, Mnemonic, Description. 0F B0 /r, CMPXCHG r/m8,r8, Compare AL with r/m8. If equal, ZF is set and r8 is loaded into r/m8. Else, clear ZF and load r/m8 ...
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50
Bit arrays and bit operations in the Linux kernel - 0xax
https://0xax.gitbooks.io/linux-insides/content/DataStructures/linux-datastructures-3.html
For example a bit array is used to store set of online/offline processors for systems which ... for example xchg instruction, cmpxchg instruction and etc.
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https://0xax.gitbooks.io/linux-insides/content/DataStructures/linux-datastructures-3.html
For example a bit array is used to store set of online/offline processors for systems which ... for example xchg instruction, cmpxchg instruction and etc.
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51
CS 444/544 Operating Systems II Sample Quiz #2
https://os2-s19.unexploitable.systems/l/sample_quiz_2_answer.pdf
cmpxchg in x86 is not a hardware atomic instruction. However, when used with the lock prefix, the instruction will be an atomic test and test-and-set ...
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https://os2-s19.unexploitable.systems/l/sample_quiz_2_answer.pdf
cmpxchg in x86 is not a hardware atomic instruction. However, when used with the lock prefix, the instruction will be an atomic test and test-and-set ...
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52
[PATCH v3 0/9] KVM: s390: Extend MEM_OP ioctl by storage ...
https://www.spinics.net/lists/kvm/msg295784.html
This mode can be use, for example, to set the device-state-change ... ioctl by storage key checked cmpxchg @@ arch/s390/kvm/gaccess.h: int ...
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https://www.spinics.net/lists/kvm/msg295784.html
This mode can be use, for example, to set the device-state-change ... ioctl by storage key checked cmpxchg @@ arch/s390/kvm/gaccess.h: int ...
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53
x86 lock, x86 64 compare and swap, cmpxchg x64, x86 ...
https://zditect.com/blog/59455566.html
The cost of the x86 LOCK prefix, (including lock cmpxchg for atomic CAS), ... At the border between each range listed above (for example, a system with 2 GB ...
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https://zditect.com/blog/59455566.html
The cost of the x86 LOCK prefix, (including lock cmpxchg for atomic CAS), ... At the border between each range listed above (for example, a system with 2 GB ...
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54
Double compare-and-exchange - Real World Tech
https://www.realworldtech.com/forum/?threadid=83838&curpostid=83904
› forum
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https://www.realworldtech.com/forum/?threadid=83838&curpostid=83904
› forum
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55
ctz - Documentation - The Zig Programming Language
https://ziglang.org/documentation/0.5.0/
In this example the variable c_string_literal has type [*]const u8 and has a ... If you are using cmpxchg in a loop, @cmpxchgWeak is the better choice, ...
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https://ziglang.org/documentation/0.5.0/
In this example the variable c_string_literal has type [*]const u8 and has a ... If you are using cmpxchg in a loop, @cmpxchgWeak is the better choice, ...
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56
lec 21 - CSE 333 - University of Washington
https://courses.cs.washington.edu/courses/cse333/15wi/lec/l21-sync.html
example: server_accept_rw_close.cc, sendreceive.cc; deal with AF_INET[6] ... example: global counter ... compare-and-swap instruction: cmpxchg
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https://courses.cs.washington.edu/courses/cse333/15wi/lec/l21-sync.html
example: server_accept_rw_close.cc, sendreceive.cc; deal with AF_INET[6] ... example: global counter ... compare-and-swap instruction: cmpxchg
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57
4. Instruction tables - Agner Fog
https://www.agner.org/optimize/instruction_tables.pdf
For example, the MOVD instruction can transfer data between general purpose ... CMPXCHG m,r16/32/64. 6. 14. LOCK CMPXCHG m,r16/32/64.
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https://www.agner.org/optimize/instruction_tables.pdf
For example, the MOVD instruction can transfer data between general purpose ... CMPXCHG m,r16/32/64. 6. 14. LOCK CMPXCHG m,r16/32/64.
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58
Example: A Conditional Buffer Overflow Program
https://www.researchgate.net/figure/Example-A-Conditional-Buffer-Overflow-Program_fig2_291592350
... useful for x86 instructions that have embedded conditions or loop structures. For example, cmpxchg compares the values in the AL, AX or EAX registers with ...
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https://www.researchgate.net/figure/Example-A-Conditional-Buffer-Overflow-Program_fig2_291592350
... useful for x86 instructions that have embedded conditions or loop structures. For example, cmpxchg compares the values in the AL, AX or EAX registers with ...
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59
Art of Assembly: Chapter Six-2 - Plantation Productions, Inc.
https://www.plantation-productions.com/Webster/www.artofasm.com/DOS/ch06/CH06-2.html
For example, add ax, bx adds bx to ax leaving the sum in the ax register. ... Note: unlike the cmp instruction, the cmpxchg instruction only affects the ...
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https://www.plantation-productions.com/Webster/www.artofasm.com/DOS/ch06/CH06-2.html
For example, add ax, bx adds bx to ax leaving the sum in the ax register. ... Note: unlike the cmp instruction, the cmpxchg instruction only affects the ...
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60
Correctly Implementing a Spinlock in C++ - Erik Rigtorp
https://rigtorp.se/spinlock/
For example ARM has the YIELD instruction. ... Example of poor spinlock implementations: ... LOCK CMPXCHG, 10, 18. LOCK CMPXCHG8B, 20, 19 ...
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https://rigtorp.se/spinlock/
For example ARM has the YIELD instruction. ... Example of poor spinlock implementations: ... LOCK CMPXCHG, 10, 18. LOCK CMPXCHG8B, 20, 19 ...
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61
Intel's Cmpxchg Instruction | Slides Computer Applications |
https://www.docsity.com/en/intel-s-cmpxchg-instruction-advanced-system-programming-lecture-slides/308664/
Download Slides - Intel's Cmpxchg Instruction - Advanced System Programming - Lecture Slides | Birla Institute of Technology and Science ...
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https://www.docsity.com/en/intel-s-cmpxchg-instruction-advanced-system-programming-lecture-slides/308664/
Download Slides - Intel's Cmpxchg Instruction - Advanced System Programming - Lecture Slides | Birla Institute of Technology and Science ...
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62
LKML: Linus Torvalds: Re: [PATCH 1/2] locking/lockref
https://lkml.org/lkml/2022/5/25/811
x86 CMPXCHG instruction returns success in ZF flag, so this ... for the original email and the x86-64 code example. Linus.
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https://lkml.org/lkml/2022/5/25/811
x86 CMPXCHG instruction returns success in ZF flag, so this ... for the original email and the x86-64 code example. Linus.
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63
Linux – what's the difference between gcc ... - iTecNote
https://itecnote.com/tecnote/linux-whats-the-difference-between-gcc-__sync_bool_compare_and_swap-and-cmpxchg/
so what's the difference between __sync_bool_compare_and_swap and cmpxchg? ... is to make a simple C example and look at the ASM the compiler generates.
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https://itecnote.com/tecnote/linux-whats-the-difference-between-gcc-__sync_bool_compare_and_swap-and-cmpxchg/
so what's the difference between __sync_bool_compare_and_swap and cmpxchg? ... is to make a simple C example and look at the ASM the compiler generates.
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64
NVVM IR :: CUDA Toolkit Documentation
https://docs.nvidia.com/cuda/nvvm-ir-spec/index.html
Calling convention markings are an example. ... 10.6.5. cmpxchg Instruction ... Name, Address Space Number, Semantics/Example ...
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https://docs.nvidia.com/cuda/nvvm-ir-spec/index.html
Calling convention markings are an example. ... 10.6.5. cmpxchg Instruction ... Name, Address Space Number, Semantics/Example ...
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65
Kernel Fuzzing with syzkaller - FreeBSD Foundation
https://freebsdfoundation.org/wp-content/uploads/2021/01/Kernel-Fuzzing.pdf
ating system interfaces; for example, it has been used to fuzz Linux's USB stack and has found ... <+41>: lock cmpxchg %ecx,0x54(%rbx). <+46>: setne %r15b.
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https://freebsdfoundation.org/wp-content/uploads/2021/01/Kernel-Fuzzing.pdf
ating system interfaces; for example, it has been used to fuzz Linux's USB stack and has found ... <+41>: lock cmpxchg %ecx,0x54(%rbx). <+46>: setne %r15b.
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66
Persistent Memory Atomics and Transactions - SNIA
https://www.snia.org/sites/default/files/technical-work/whitepapers/SNIA-Persistent-Memory-Atomics-Transactions-WP.pdf
For example, Intel CMPXCHG (Compare and Exchange) provides an atomic compare and memory update, but does not flush to. PM.
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https://www.snia.org/sites/default/files/technical-work/whitepapers/SNIA-Persistent-Memory-Atomics-Transactions-WP.pdf
For example, Intel CMPXCHG (Compare and Exchange) provides an atomic compare and memory update, but does not flush to. PM.
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67
Intel 80x86 Assembly Language OpCodes
http://www.mathemainzel.info/files/x86asmref.html
CMPXCHG/CMPXCHG8B - Compare and Exchange. mnemonics, op xx xx xx xx xx, sw, len, flags. CMPXCHG rmb,rb [486], 0F ...
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http://www.mathemainzel.info/files/x86asmref.html
CMPXCHG/CMPXCHG8B - Compare and Exchange. mnemonics, op xx xx xx xx xx, sw, len, flags. CMPXCHG rmb,rb [486], 0F ...
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68
Intel's 'cmpxchg' instruction PowerPoint ... - SlideServe
https://www.slideserve.com/gustav/intel-s-cmpxchg-instruction
Intel's 'cmpxchg' instruction How does the Linux kernel's 'cmos_lock' ... Example: 'cmpxchg' • Operation of the 'cmpxchg' instruction is ...
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https://www.slideserve.com/gustav/intel-s-cmpxchg-instruction
Intel's 'cmpxchg' instruction How does the Linux kernel's 'cmos_lock' ... Example: 'cmpxchg' • Operation of the 'cmpxchg' instruction is ...
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69
Re: wake_q memory ordering - The Linux-Kernel Archive
https://lkml.iu.edu/hypermail/linux/kernel/1910.1/03062.html
IOW, the only way to get a cmpxchg without barriers on failure, is with ... Your example is incomplete (there is no A=1 assignment for ...
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https://lkml.iu.edu/hypermail/linux/kernel/1910.1/03062.html
IOW, the only way to get a cmpxchg without barriers on failure, is with ... Your example is incomplete (there is no A=1 assignment for ...
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70
Memory Barriers in the Linux Kernel - eLinux.org
https://elinux.org/images/a/ab/Bueso.pdf
Reordering Examples. • Underlying need for memory ... Flagship Example. A = 0, B = 0 (shared variables) ... [atomic_*_]cmpxchg() atomic_*_add_unless() ...
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https://elinux.org/images/a/ab/Bueso.pdf
Reordering Examples. • Underlying need for memory ... Flagship Example. A = 0, B = 0 (shared variables) ... [atomic_*_]cmpxchg() atomic_*_add_unless() ...
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71
futex(2) - Linux manual page - man7.org
https://man7.org/linux/man-pages/man2/futex.2.html
The most notable example is the implementation of ... a compare-and-swap operation such as cmpxchg on the x86 architecture).
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https://man7.org/linux/man-pages/man2/futex.2.html
The most notable example is the implementation of ... a compare-and-swap operation such as cmpxchg on the x86 architecture).
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72
Intel's 'cmpxchg' instruction How does the Linux kernel's ...
https://slideplayer.com/slide/5060012/
6 Example: 'cmpxchg' Operation of the 'cmpxchg' instruction is described (on 3 pages) in Volume 2A There's an English-sentence description, ...
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https://slideplayer.com/slide/5060012/
6 Example: 'cmpxchg' Operation of the 'cmpxchg' instruction is described (on 3 pages) in Volume 2A There's an English-sentence description, ...
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73
C++ Memory Model: Migrating from X86 to ARM - ArangoDB
https://www.arangodb.com/2021/02/cpp-memory-model-migrating-from-x86-to-arm/
... (atomic fetch-and-add) or lock cmpxchg (atomic compare-and-swap). ... For example, the compiler can freely reorder two relaxed atomic ...
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https://www.arangodb.com/2021/02/cpp-memory-model-migrating-from-x86-to-arm/
... (atomic fetch-and-add) or lock cmpxchg (atomic compare-and-swap). ... For example, the compiler can freely reorder two relaxed atomic ...
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74
Compare And Swap - Some Assembly Required*
http://www.mindfruit.co.uk/2012/01/compare-and-swap.html
Probably the best known is the cmpxchg instruction, which takes two ... effect with a lock add or lock xadd , but then this example code.
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http://www.mindfruit.co.uk/2012/01/compare-and-swap.html
Probably the best known is the cmpxchg instruction, which takes two ... effect with a lock add or lock xadd , but then this example code.
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75
Evaluating the Cost of Atomic Operations on Modern ...
https://spcl.inf.ethz.ch/Publications/.pdf/atomic-bench.pdf
For example, a single node in popular Cray XE6 cabinets provides two AMD Bulldozer CPUs connected ... Cmpxchg. Cmpxchg. Cmpxchg. FAA assembly instruction.
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https://spcl.inf.ethz.ch/Publications/.pdf/atomic-bench.pdf
For example, a single node in popular Cray XE6 cabinets provides two AMD Bulldozer CPUs connected ... Cmpxchg. Cmpxchg. Cmpxchg. FAA assembly instruction.
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76
18 - CS 131/CSCI 1310: Fundamentals of Computer Systems
https://cs.brown.edu/courses/csci1310/2020/notes/l18.html
Here's an example, in which two threads are trying to both increment an integer ... a "compare-and-swap" operation (CMPXCHG in x86-64) atomically reads the ...
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https://cs.brown.edu/courses/csci1310/2020/notes/l18.html
Here's an example, in which two threads are trying to both increment an integer ... a "compare-and-swap" operation (CMPXCHG in x86-64) atomically reads the ...
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77
src/share/vm/runtime/atomic.hpp
http://cr.openjdk.java.net/~dcubed/8057109-webrev/0-jdk9-hs-rt/src/share/vm/runtime/atomic.hpp.sdiff.html
112 113 static unsigned int cmpxchg(unsigned int exchange_value, 114 volatile ... 124 // 125 // Example 126 // ATOMIC_SHORT_PAIR( 127 // volatile short ...
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http://cr.openjdk.java.net/~dcubed/8057109-webrev/0-jdk9-hs-rt/src/share/vm/runtime/atomic.hpp.sdiff.html
112 113 static unsigned int cmpxchg(unsigned int exchange_value, 114 volatile ... 124 // 125 // Example 126 // ATOMIC_SHORT_PAIR( 127 // volatile short ...
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78
Page Comparison - Async Monitor Deflation (v.10 vs v.11)
https://wiki.openjdk.org/pages/diffpages.action?originalId=42598956&pageId=42598958
... rework the "T-hash Wins" example. ... The data fields are at their starting values. T-deflate is about to execute cmpxchg().
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https://wiki.openjdk.org/pages/diffpages.action?originalId=42598956&pageId=42598958
... rework the "T-hash Wins" example. ... The data fields are at their starting values. T-deflate is about to execute cmpxchg().
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79
A Comparison between WebAssembly and RISC-V - Medium
https://medium.com/@losfair/a-comparison-between-webassembly-and-risc-v-e8fb9d37e6cc
The x86 instruction set, for example, was once executed directly by the ... This instruction is i{32,64}.atomic.rmw.cmpxchg in WebAssembly, ...
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https://medium.com/@losfair/a-comparison-between-webassembly-and-risc-v-e8fb9d37e6cc
The x86 instruction set, for example, was once executed directly by the ... This instruction is i{32,64}.atomic.rmw.cmpxchg in WebAssembly, ...
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80
Evaluating the Cost of Atomic Operations on Modern ... - arXiv
https://arxiv.org/pdf/2010.09852
For example, according to the common view, Compare-and- ... Cmpxchg. Cmpxchg. Cmpxchg. FAA assembly instruction.
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https://arxiv.org/pdf/2010.09852
For example, according to the common view, Compare-and- ... Cmpxchg. Cmpxchg. Cmpxchg. FAA assembly instruction.
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81
Basics of Futexes - Eli Bendersky's website
https://eli.thegreenplace.net/2018/basics-of-futexes/
Let's study a simple example demonstrating basic usage of futexes to ... c = cmpxchg(&atom_, 0, 1); // If the lock was previously unlocked, ...
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https://eli.thegreenplace.net/2018/basics-of-futexes/
Let's study a simple example demonstrating basic usage of futexes to ... c = cmpxchg(&atom_, 0, 1); // If the lock was previously unlocked, ...
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82
std::atomic from bottom up - Lu's blog
https://blog.the-pans.com/std-atomic-from-bottom-up/
Now back to the example in the beginning of the post, ... It issues atomic instruction e.g. lock cmpxchg on x86 to perform read-modify-write ...
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https://blog.the-pans.com/std-atomic-from-bottom-up/
Now back to the example in the beginning of the post, ... It issues atomic instruction e.g. lock cmpxchg on x86 to perform read-modify-write ...
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83
Implementing generic double-word compare and swap for x86 ...
https://blog.lse.epita.fr/2013/02/27/implementing-generic-double-word-compare-and-swap.html
Using cmpxchg for 32bit wide pointers So, let's start with the easy case: ... garbage collector or Load-Link/Store-Condition for example.).
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https://blog.lse.epita.fr/2013/02/27/implementing-generic-double-word-compare-and-swap.html
Using cmpxchg for 32bit wide pointers So, let's start with the easy case: ... garbage collector or Load-Link/Store-Condition for example.).
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84
genalloc.c source code [linux/lib/genalloc.c] - Codebrowser
https://codebrowser.dev/linux/linux/lib/genalloc.c.html
4, * memory, for example, memory that is not managed by the ... 20, * The basic atomic operation of this allocator is cmpxchg on long.
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https://codebrowser.dev/linux/linux/lib/genalloc.c.html
4, * memory, for example, memory that is not managed by the ... 20, * The basic atomic operation of this allocator is cmpxchg on long.
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85
A Guide to Programming Intel IA32 PC Architecture
https://flint.cs.yale.edu/cs422/doc/pc-arch.html
For example, the state of the EFLAGS register is 00000002H and the memory is unchanged. Thus, the memory will contain ... cmpxchg{l,w,b} dest1, dest2.
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https://flint.cs.yale.edu/cs422/doc/pc-arch.html
For example, the state of the EFLAGS register is 00000002H and the memory is unchanged. Thus, the memory will contain ... cmpxchg{l,w,b} dest1, dest2.
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86
Practical Concurrent and Parallel Programming 11
https://thomasahle.com/teaching/pcpp2019/Week_11/lecture.pdf
Examples: AtomicInteger and NumberRange ... Based on example in java.util.concurrent. ... Intel x86 Instruction Reference CMPXCHG:.
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https://thomasahle.com/teaching/pcpp2019/Week_11/lecture.pdf
Examples: AtomicInteger and NumberRange ... Based on example in java.util.concurrent. ... Intel x86 Instruction Reference CMPXCHG:.
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87
IR builders — llvmlite 0.37.0rc2-dirty documentation
https://llvmlite.readthedocs.io/en/v0.37.0rc2/user-guide/ir/ir-builder.html
Examples include the fast-math flags for floating-point ... llvmlite.ir.cmpxchg(ptr, cmp, val, ordering, failordering=None, name='')¶.
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https://llvmlite.readthedocs.io/en/v0.37.0rc2/user-guide/ir/ir-builder.html
Examples include the fast-math flags for floating-point ... llvmlite.ir.cmpxchg(ptr, cmp, val, ordering, failordering=None, name='')¶.
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88
Foundation and the cost of Synchronization
https://nyu-cso.github.io/notes/23-Foundation_and_Performance.pdf
2 types of atomic instructions atomic instruc ons mov xchg ... atomic with lock prefix add, sub inc, dec and, or, xor cmpxchg.
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https://nyu-cso.github.io/notes/23-Foundation_and_Performance.pdf
2 types of atomic instructions atomic instruc ons mov xchg ... atomic with lock prefix add, sub inc, dec and, or, xor cmpxchg.
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89
OpenMP Reduction Case Study: Trapezoid Integration Example
https://web.engr.oregonstate.edu/~mjb/cs575/Handouts/trapezoid.1pp.pdf
Trapezoid Integration Example trapezoid.pptx. Mike Bailey mjb@cs.oregonstate.edu ... Uses a hardware instruction CMPXCHG (compare-and-exchange).
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https://web.engr.oregonstate.edu/~mjb/cs575/Handouts/trapezoid.1pp.pdf
Trapezoid Integration Example trapezoid.pptx. Mike Bailey mjb@cs.oregonstate.edu ... Uses a hardware instruction CMPXCHG (compare-and-exchange).
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90
Instruction Set Summary - pkgbuild.com
https://pkgbuild.com/~ffy00/resources/InstructionSetSummary.pdf
CMPXCHG (compare and exchange) instruction. • ΙNVD (invalidate cache) instruction. ... When two or more mnemonics are given (for example,.
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https://pkgbuild.com/~ffy00/resources/InstructionSetSummary.pdf
CMPXCHG (compare and exchange) instruction. • ΙNVD (invalidate cache) instruction. ... When two or more mnemonics are given (for example,.
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91
Some performance implications of CAS operations - Joe Duffy
http://joeduffyblog.com/2009/01/08/some-performance-implications-of-cas-operations/
This set entails X86 instructions like XCHG, CMPXCHG, and certain ... The CMPXCHG example (Variant #2) can be improved by strategic spinning ...
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http://joeduffyblog.com/2009/01/08/some-performance-implications-of-cas-operations/
This set entails X86 instructions like XCHG, CMPXCHG, and certain ... The CMPXCHG example (Variant #2) can be improved by strategic spinning ...
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92
My notes on Intel's Transactional Memory (it's ... - Errata Security
https://blog.erratasec.com/2012/02/my-notes-on-intels-transactional-memory.html
An example of this is the code "atomic {x++; y++;}" on the Ars Technica ... On the x86, this is done with a "lock cmpxchg" instruction.
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https://blog.erratasec.com/2012/02/my-notes-on-intels-transactional-memory.html
An example of this is the code "atomic {x++; y++;}" on the Ars Technica ... On the x86, this is done with a "lock cmpxchg" instruction.
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93
include/llvm/CodeGen/AtomicExpandUtils.h - Manticore
https://smlnj-gitlab.cs.uchicago.edu/manticore/llvm/blob/ca0cc470467c24559e464452bb829aa6cc431162/include/llvm/CodeGen/AtomicExpandUtils.h
... likes cmpxchg /// instructions in the first place and that there isn't another, better, /// transformation available (for example ...
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https://smlnj-gitlab.cs.uchicago.edu/manticore/llvm/blob/ca0cc470467c24559e464452bb829aa6cc431162/include/llvm/CodeGen/AtomicExpandUtils.h
... likes cmpxchg /// instructions in the first place and that there isn't another, better, /// transformation available (for example ...
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94
How Do Locks Lock? - Moserware
http://www.moserware.com/2008/09/how-do-locks-lock.html
Here's an example of some typical code you might see in an ... By far, the most interesting aspect of this is the “lock cmpxchg” line.
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http://www.moserware.com/2008/09/how-do-locks-lock.html
Here's an example of some typical code you might see in an ... By far, the most interesting aspect of this is the “lock cmpxchg” line.
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95
Lock-free stack problem - The Delphi Geek
https://www.thedelphigeek.com/2008/07/lock-free-stack-problem.html
The single point of failure is the lock cmpxchg instruction (the ... where locks are held for *very short* times (as in your example).
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https://www.thedelphigeek.com/2008/07/lock-free-stack-problem.html
The single point of failure is the lock cmpxchg instruction (the ... where locks are held for *very short* times (as in your example).
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