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Groups > comp.lang.c++ > #81724
| From | "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> |
|---|---|
| Newsgroups | comp.lang.c++ |
| Subject | Re: Tricky ... |
| Date | 2021-10-01 17:14 -0700 |
| Organization | Aioe.org NNTP Server |
| Message-ID | <sj888o$23m$1@gioia.aioe.org> (permalink) |
| References | (17 earlier) <sj70mt$g5k$1@dont-email.me> <sj7pk6$v7e$1@gioia.aioe.org> <VyK5J.212801$T_8.185707@fx48.iad> <sj7u9o$q2t$1@gioia.aioe.org> <rKL5J.212806$T_8.27125@fx48.iad> |
On 10/1/2021 3:13 PM, Branimir Maksimovic wrote:
> On 2021-10-01, Chris M. Thomasson <chris.m.thomasson.1@gmail.com> wrote:
>> On 10/1/2021 1:53 PM, Branimir Maksimovic wrote:
>>> On 2021-10-01, Chris M. Thomasson <chris.m.thomasson.1@gmail.com> wrote:
>>>> On 10/1/2021 5:59 AM, Bonita Montero wrote:
>>>>> Am 01.10.2021 um 13:43 schrieb Öö Tiib:
>>>>>> On Friday, 1 October 2021 at 04:32:18 UTC+3, Bonita Montero wrote:
>>>>>>> Am 30.09.2021 um 22:20 schrieb Chris M. Thomasson:
>>>>>>>> On 9/30/2021 3:39 AM, Bonita Montero wrote:
>>>>>>>>>> That's a bit vague. One can create highly efficient bidirectional
>>>>>>>>>> communication between two threads using two wait-free
>>>>>>>>>> single-producer/single-consumer queues without using any atomic RMW's,
>>>>>>>>>> just atomic loads, stores, and some some cleverly placed membars.
>>>>>>>>>
>>>>>>>>> When you use wait-free or lock-free algorithms and there's no data you
>>>>>>>>> have to poll.
>>>>>>>>
>>>>>>>> Why?
>>>>>>> Because you don't have to wait in the kernel.
>>>>>>
>>>>>> What a thread does when its input queue is empty?
>>>>>
>>>>> If it hasn't anything other to do than "waiting" for a new entry it spins.
>>>>
>>>> Huh? Ever heard of a futex, or an eventcount? Take a lock-free dynamic stack
>>>> into account. When its empty we can use, say, a futex to wait on it. This
>>>> would be the slow-path. A fast-path is when the stack is not empty. There is
>>>> a big difference between a fast and a slow path. The former is lock-free, the
>>>> latter might have to wait.
>>>>
>>>> This even works for wait-free structures. In this case, the fast-path would
>>>> be wait-free.
>>>
>>> Watch out that "wait free" isn't just spining with more cpomplex algorithm
>>> doing nothing usefull :P
>>
>> True! Imvvvho, wait-free should be loopless. Now, I always got nervous
>> over trying to implement wait-free with LL/SC, an optimistic atomic
>> primitive. I prefer to implement them using pessimistic atomic ops like
>> an atomic exchange or fetch-and-add. However, then again atomic exchange
>> can be implemented by LL/SC, or CAS. This is not Kosher in my mind.
>> Quite fond of the pessimistic x86 XADD or XCHG atomic OPS when it comes
>> to wait-free because there is no looping involved. Actually, CAS in x86
>> can be used for a state machine without looping because it always
>> returns a result. If CAS on x86 fails we have the reason why. This is
>> different than LL/SC that can spuriously fail.
>>
>>
>>
>>> here is mine mutex:
>>> format elf64
>>>
>>> FUTEX_WAIT equ 0
>>> FUTEX_WAKE equ 1
>>> FUTEX_PRIVATE_FLAG equ 128
>>>
>>> public futex_acquire
>>> public futex_release
>>>
>>> futex_acquire:
>>> push rbx
>>> push r15
>>> ; push r10
>>> mov r15,rdi
>>> .L0:
>>> mov ebx,1
>>> xor eax,eax
>>> lock cmpxchg [r15],ebx
>>> test eax,eax
>>> jz .L1
>>> mov eax, 202
>>> mov rdi, r15
>>> mov rsi, FUTEX_WAIT or FUTEX_PRIVATE_FLAG
>>> mov edx, 1
>>> xor r10,r10
>>> syscall
>>> jmp .L0
>>> .L1:; pop r10
>>> pop r15
>>> pop rbx
>>> ret
>>>
>>> futex_release:
>>> lock and dword[rdi],0
>>> mov eax,202
>>> ; mov rdi, sema
>>> mov rsi, FUTEX_WAKE or FUTEX_PRIVATE_FLAG
>>> mov edx,1
>>> syscall
>>> ret
>>
>> Need to look at it, should work. Fwiw, here is an example using a futex
>> on windows. Yes it actually has one, lol! Btw, this is using XCHG only.
>> ______________________________________
>> #include <iostream>
>> #include <thread>
>> #include <functional>
>>
>> #define WIN32_LEAN_AND_MEAN
>> #include <Windows.h>
>>
>>
>> #define CT_L2_ALIGNMENT 128
>> #define CT_THREADS 32
>> #define CT_ITERS 6666666
>>
>>
>> struct ct_futex_mutex
>> {
>> ULONG alignas(CT_L2_ALIGNMENT) m_state;
>>
>> ct_futex_mutex() : m_state(0)
>> {
>>
>> }
>>
>> void lock()
>> {
>> if (InterlockedExchange(&m_state, 1))
>> {
>> while (InterlockedExchange(&m_state, 2))
>> {
>> ULONG cmp = 2;
>> WaitOnAddress(&m_state, &cmp, sizeof(ULONG), INFINITE);
>> }
>> }
>> }
>>
>> void unlock()
>> {
>> if (InterlockedExchange(&m_state, 0) == 2)
>> {
>> WakeByAddressSingle(&m_state);
>> }
>> }
>> };
>>
>>
> Same thing practically, except linux futex, which is same thing.
> Interrestingly Darwin does not have it and I am really interrested
> how Apple immplements pthread_mutex?
>
Ohhhh... Good question. I am not sure about Darwin. Actually, there is a
way to implement the mutex I showed you using binary semaphores for the
slow path. Iirc, it went like this, with the futex part commented out,
and the initialization of the binary sema to zero, auto-reset event on
windoze, also out:
____________________________
struct ct_futex_mutex
{
ULONG alignas(CT_L2_ALIGNMENT) m_state;
ct_futex_mutex() : m_state(0)
{
}
void lock()
{
if (InterlockedExchange(&m_state, 1))
{
while (InterlockedExchange(&m_state, 2))
{
//ULONG cmp = 2;
//WaitOnAddress(&m_state, &cmp, sizeof(ULONG), INFINITE);
WaitForSingleObject(m_event, INFINITE);
}
}
}
void unlock()
{
if (InterlockedExchange(&m_state, 0) == 2)
{
//WakeByAddressSingle(&m_state);
SetEvent(m_event);
}
}
};
____________________________
That works as well. Humm...
https://github.com/apple/darwin-libpthread/blob/main/man/pthread_mutex_lock.3
https://github.com/apple/darwin-libpthread/blob/main/src/pthread_mutex.c
Need to example this! There is another way to create a nice FIFO mutex
using a fast semaphore. Iirc, it was called a benaphore:
https://www.haiku-os.org/legacy-docs/benewsletter/Issue1-26.html#Engineering1-26
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Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-20 22:43 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-09-23 10:38 -0700
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-23 20:29 +0200
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-23 20:30 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-09-24 18:48 -0700
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-09-24 18:56 -0700
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-25 07:24 +0200
Re: Tricky ... Branimir Maksimovic <branimir.maksimovic@gmail.com> - 2021-09-25 12:28 +0000
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-25 15:57 +0200
Re: Tricky ... Branimir Maksimovic <branimir.maksimovic@gmail.com> - 2021-09-25 13:59 +0000
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-25 16:09 +0200
Re: Tricky ... Branimir Maksimovic <branimir.maksimovic@gmail.com> - 2021-09-25 17:13 +0000
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-25 19:15 +0200
Re: Tricky ... Branimir Maksimovic <branimir.maksimovic@gmail.com> - 2021-09-25 17:22 +0000
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-26 05:46 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-04 01:19 -0700
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Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-04 10:08 -0700
Re: Tricky ... Öö Tiib <ootiib@hot.ee> - 2021-10-04 08:50 -0700
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-04 10:07 -0700
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-09-25 13:34 -0700
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Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-09-29 18:43 -0700
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-09-29 19:47 -0700
Re: Tricky ... David Brown <david.brown@hesbynett.no> - 2021-09-30 09:10 +0200
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Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-01 13:19 -0700
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-09-27 00:18 -0700
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Re: Tricky ... red floyd <no.spam.here@its.invalid> - 2021-09-27 10:54 -0700
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Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-09-27 14:06 -0700
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-09-27 16:09 -0700
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-28 06:57 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-09-27 22:28 -0700
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-28 08:33 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-09-28 00:03 -0700
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Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-30 08:16 +0200
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Re: Tricky ... Öö Tiib <ootiib@hot.ee> - 2021-10-01 04:43 -0700
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Re: Tricky ... Branimir Maksimovic <branimir.maksimovic@icloud.com> - 2021-10-01 13:10 +0000
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-01 13:04 -0700
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Re: Tricky ... Branimir Maksimovic <branimir.maksimovic@icloud.com> - 2021-10-02 01:44 +0000
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Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-01 22:12 -0700
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-10-02 07:35 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-01 22:49 -0700
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-10-02 08:00 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-01 23:12 -0700
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-10-02 08:38 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-01 23:39 -0700
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-10-02 08:46 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-01 23:50 -0700
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Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-01 22:12 -0700
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-01 22:14 -0700
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Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-01 23:41 -0700
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-01 23:44 -0700
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-10-02 08:47 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-01 23:51 -0700
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-10-02 08:53 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-02 00:04 -0700
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-10-02 09:13 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-02 00:20 -0700
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-10-02 09:30 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-02 00:32 -0700
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-10-02 10:27 +0200
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Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-10-05 07:13 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-06 12:22 -0700
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-10-07 08:36 +0200
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Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-10-07 12:15 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-07 12:21 -0700
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Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-10-08 07:52 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-08 12:56 -0700
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Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-10-02 09:31 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-02 00:32 -0700
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-10-02 10:27 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-02 01:36 -0700
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-10-02 10:57 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-06 17:19 -0700
Re: Tricky ... Branimir Maksimovic <branimir.maksimovic@icloud.com> - 2021-10-07 02:17 +0000
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-06 19:38 -0700
Re: Tricky ... Branimir Maksimovic <branimir.maksimovic@icloud.com> - 2021-10-07 02:45 +0000
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-06 20:01 -0700
Re: Tricky ... Branimir Maksimovic <branimir.maksimovic@icloud.com> - 2021-10-07 03:24 +0000
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-08 13:13 -0700
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-10-07 08:37 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-07 01:15 -0700
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-10-07 12:16 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-07 12:26 -0700
Re: Tricky ... Branimir Maksimovic <branimir.maksimovic@icloud.com> - 2021-10-07 20:16 +0000
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-07 14:27 -0700
Re: Tricky ... Branimir Maksimovic <branimir.maksimovic@icloud.com> - 2021-10-07 23:27 +0000
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-08 15:24 -0700
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-10-08 07:53 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-08 12:53 -0700
Re: Tricky ... Branimir Maksimovic <branimir.maksimovic@icloud.com> - 2021-10-01 13:08 +0000
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-02 00:31 -0700
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-02 00:52 -0700
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-28 06:55 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-09-27 22:27 -0700
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-09-27 22:49 -0700
Re: Tricky ... Branimir Maksimovic <branimir.maksimovic@gmail.com> - 2021-09-29 02:31 +0000
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-09-28 20:14 -0700
Re: Tricky ... Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-28 08:33 +0200
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-09-28 00:06 -0700
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-09-29 12:09 -0700
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-09-30 13:00 -0700
Re: Tricky ... RadicalRabbit@theburrow.co.uk - 2021-10-01 09:17 +0000
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-01 13:11 -0700
Re: Tricky ... RadicalRabbit@theburrow.co.uk - 2021-10-03 08:25 +0000
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-03 13:21 -0700
Re: Tricky ... Branimir Maksimovic <branimir.maksimovic@icloud.com> - 2021-10-03 21:06 +0000
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-03 14:33 -0700
Re: Tricky ... Branimir Maksimovic <branimir.maksimovic@icloud.com> - 2021-10-04 04:42 +0000
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-06 18:11 -0700
Re: Tricky ... Branimir Maksimovic <branimir.maksimovic@icloud.com> - 2021-10-07 02:20 +0000
Re: Tricky ... Ian Collins <ian-news@hotmail.com> - 2021-10-07 22:26 +1300
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-08 14:07 -0700
Re: Tricky ... Branimir Maksimovic <branimir.maksimovic@icloud.com> - 2021-10-01 13:07 +0000
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-01 13:08 -0700
Re: Tricky ... Branimir Maksimovic <branimir.maksimovic@icloud.com> - 2021-10-01 20:54 +0000
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-03 13:33 -0700
Re: Tricky ... Branimir Maksimovic <branimir.maksimovic@icloud.com> - 2021-10-03 21:07 +0000
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-03 14:51 -0700
Re: Tricky ... Branimir Maksimovic <branimir.maksimovic@icloud.com> - 2021-10-04 04:44 +0000
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-08 13:05 -0700
Re: Tricky ... Branimir Maksimovic <branimir.maksimovic@icloud.com> - 2021-10-09 07:29 +0000
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-09 19:55 -0700
Re: Tricky ... Branimir Maksimovic <branimir.maksimovic@icloud.com> - 2021-10-11 05:21 +0000
Re: Tricky ... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-28 13:49 -0700
Re: Tricky ... "daniel...@gmail.com" <danielaparker@gmail.com> - 2021-10-28 20:29 -0700
csiph-web