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Tiny Fiber ( A razor thin cross platform fiber library )
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/* | |
MIT License | |
Copyright (c) 2023 Jiayin Cao | |
Permission is hereby granted, free of charge, to any person obtaining a copy | |
of this software and associated documentation files (the "Software"), to deal | |
in the Software without restriction, including without limitation the rights | |
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
copies of the Software, and to permit persons to whom the Software is | |
furnished to do so, subject to the following conditions: | |
The above copyright notice and this permission notice shall be included in all | |
copies or substantial portions of the Software. | |
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
SOFTWARE. | |
*/ | |
// Tiny fiber is a lazor thin library that support fiber interfaces on different 64 bits platforms. | |
// User can include this one header file in their project to use fiber in their own projects. | |
// It is currently supported on the following platform | |
// - X64 Windows | |
// - X64 Linux | |
// - X64 Mac | |
// - Arm64 Linux | |
// - Arm64 Mac | |
// | |
// Below is a simple example demonstrating the basic usage of the library | |
// | |
// #include <iostream> | |
// #include "tiny_fiber.h" | |
// | |
// tiny_fiber::FiberHandle thread_fiber; | |
// tiny_fiber::FiberHandle fiber; | |
// | |
// void fibermain(void* arg) { | |
// tiny_fiber::FiberHandle fiber = *reinterpret_cast<tiny_fiber::FiberHandle*>(arg); | |
// std::cout<<"hello fiber"<<std::endl; | |
// tiny_fiber::SwitchFiber(fiber, thread_fiber); | |
// } | |
// | |
// int main(int argc, char** argv) { | |
// const int stack_size = 1024 * 16; | |
// thread_fiber = tiny_fiber::CreateFiberFromThread(); | |
// fiber = tiny_fiber::CreateFiber(stack_size, fibermain, &fiber); | |
// tiny_fiber::SwitchFiber(thread_fiber, fiber); | |
// return 0; | |
// } | |
// | |
#pragma once | |
#if defined(__aarch64__) | |
#define TINY_FIBER_ARM64 | |
#elif defined(__x86_64__) || defined(_M_X64) | |
#define TINY_FIBER_X64 | |
#else | |
#error "Target architecture is not supported." | |
#endif | |
#if defined(__APPLE__) | |
#define TINY_FIBER_APPLE | |
#elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__NT__) | |
#define TINY_FIBER_WIN | |
#elif defined(__linux__) | |
#define TINY_FIBER_LINUX | |
#else | |
#error "Target Platform is not supported." | |
#endif | |
#if defined(TINY_FIBER_ARM64) && !defined(TINY_FIBER_WIN) | |
#define FIBER_ASM_ARM64_IMPLEMENTATION | |
#elif defined(TINY_FIBER_X64) && !defined(TINY_FIBER_WIN) | |
#define FIBER_ASM_X64_IMPLEMENTATION | |
#endif | |
#if defined(TINY_FIBER_MALLOC) && defined(TINY_FIBER_FREE) | |
// custom stack allocation is fine | |
#elif !defined(TINY_FIBER_MALLOC) && !defined(TINY_FIBER_FREE) | |
// default stack allocation is fine either | |
#else | |
#error "Do not define either of TINY_FIBER_MALLOC and TINY_FIBER_FREE" | |
#endif | |
#include <memory> | |
#if defined(TINY_FIBER_WIN) | |
#include <Windows.h> | |
#endif | |
#ifndef TINY_FIBER_MALLOC | |
#define TINY_FIBER_MALLOC malloc | |
#define TINY_FIBER_FREE free | |
#endif | |
namespace tiny_fiber { | |
// an alias for CPU registers, all need to be 64 bits long | |
typedef unsigned long long Register; | |
// check the register size, making sure it is 8 bytes. | |
static_assert(sizeof(Register) == 8, "Incorrect register size"); | |
// helper macro to check the offset of a register in fiber context | |
#define CHECK_OFFSET(REGISTER, OFFSET) \ | |
static_assert(offsetof(FiberContexInternal, REGISTER) == OFFSET, \ | |
"Incorrect register offset") | |
// Both x64 and arm64 require stack memory pointer to be 16 bytes aligned | |
#define FIBER_STACK_ALIGNMENT 16 | |
// MacOS requires a _ to be defined at the beginning of a function name implemented in asm | |
#if defined(TINY_FIBER_APPLE) | |
#define _switch_fiber_internal switch_fiber_internal | |
#endif | |
#ifdef FIBER_ASM_ARM64_IMPLEMENTATION | |
#define FIBER_ASM_IMPLEMENTATION | |
// alias for registers that need to be saved during a fiber switch | |
#define FIBER_REG_X0 0x00 | |
#define FIBER_REG_X16 0x08 | |
#define FIBER_REG_X17 0x10 | |
#define FIBER_REG_X18 0x18 | |
#define FIBER_REG_X19 0x20 | |
#define FIBER_REG_X20 0x28 | |
#define FIBER_REG_X21 0x30 | |
#define FIBER_REG_X22 0x38 | |
#define FIBER_REG_X23 0x40 | |
#define FIBER_REG_X24 0x48 | |
#define FIBER_REG_X25 0x50 | |
#define FIBER_REG_X26 0x58 | |
#define FIBER_REG_X27 0x60 | |
#define FIBER_REG_X28 0x68 | |
#define FIBER_REG_X29 0x70 | |
#define FIBER_REG_X30 0x78 | |
#define FIBER_REG_V8 0x80 | |
#define FIBER_REG_V9 0x88 | |
#define FIBER_REG_V10 0x90 | |
#define FIBER_REG_V11 0x98 | |
#define FIBER_REG_V12 0xa0 | |
#define FIBER_REG_V13 0xa8 | |
#define FIBER_REG_V14 0xb0 | |
#define FIBER_REG_V15 0xb8 | |
#define FIBER_REG_SP 0xc0 | |
/** | |
* On Arm 64 architecture, each register should be 64 bits. And following registers need to be | |
* saved during a context switch | |
* - [X16 - X30] | |
* https://developer.arm.com/documentation/102374/0101/Procedure-Call-Standard | |
* - [D16 - D23] | |
* https://developer.arm.com/documentation/den0024/a/The-ABI-for-ARM-64-bit-Architecture/Register-use-in-the-AArch64-Procedure-Call-Standard/Parameters-in-NEON-and-floating-point-registers | |
*/ | |
struct FiberContexInternal { | |
// funciton paramters | |
Register x0; | |
// general purpose registers | |
Register x16; | |
Register x17; | |
Register x18; | |
Register x19; | |
Register x20; | |
Register x21; | |
Register x22; | |
Register x23; | |
Register x24; | |
Register x25; | |
Register x26; | |
Register x27; | |
Register x28; | |
Register x29; // frame pointer (FP) | |
Register x30; // link register (R30) | |
// float-point and neon registers | |
Register v8; | |
Register v9; | |
Register v10; | |
Register v11; | |
Register v12; | |
Register v13; | |
Register v14; | |
Register v15; | |
// stack pointer | |
Register sp; | |
}; | |
// Making sure our offsets are all correct | |
CHECK_OFFSET(x0, FIBER_REG_X0); | |
CHECK_OFFSET(x16, FIBER_REG_X16); | |
CHECK_OFFSET(x17, FIBER_REG_X17); | |
CHECK_OFFSET(x18, FIBER_REG_X18); | |
CHECK_OFFSET(x19, FIBER_REG_X19); | |
CHECK_OFFSET(x20, FIBER_REG_X20); | |
CHECK_OFFSET(x21, FIBER_REG_X21); | |
CHECK_OFFSET(x22, FIBER_REG_X22); | |
CHECK_OFFSET(x23, FIBER_REG_X23); | |
CHECK_OFFSET(x24, FIBER_REG_X24); | |
CHECK_OFFSET(x25, FIBER_REG_X25); | |
CHECK_OFFSET(x26, FIBER_REG_X26); | |
CHECK_OFFSET(x27, FIBER_REG_X27); | |
CHECK_OFFSET(x28, FIBER_REG_X28); | |
CHECK_OFFSET(x29, FIBER_REG_X29); | |
CHECK_OFFSET(x30, FIBER_REG_X30); | |
CHECK_OFFSET(v8, FIBER_REG_V8); | |
CHECK_OFFSET(v9, FIBER_REG_V9); | |
CHECK_OFFSET(v10, FIBER_REG_V10); | |
CHECK_OFFSET(v11, FIBER_REG_V11); | |
CHECK_OFFSET(v12, FIBER_REG_V12); | |
CHECK_OFFSET(v13, FIBER_REG_V13); | |
CHECK_OFFSET(v14, FIBER_REG_V14); | |
CHECK_OFFSET(v15, FIBER_REG_V15); | |
CHECK_OFFSET(sp, FIBER_REG_SP); | |
// create a new fiber | |
extern "C" inline bool _create_fiber_internal(void* stack, uint32_t stack_size, void (*target)(void*), void* arg, FiberContexInternal* context) { | |
// it is the users responsibility to make sure the stack is 16 bytes aligned, which is required by the Arm64 architecture | |
if((((uintptr_t)stack) & (FIBER_STACK_ALIGNMENT - 1)) != 0) | |
return false; | |
uintptr_t* stack_top = (uintptr_t*)((uint8_t*)(stack) + stack_size); | |
context->x30 = (uintptr_t)target; | |
context->x0 = (uintptr_t)arg; | |
context->sp = (uintptr_t)stack_top; | |
return true; | |
} | |
// switching to a different fiber | |
asm( | |
R"( | |
.text | |
.align 4 | |
_switch_fiber_internal: | |
str x16, [x0, 0x08] /* FIBER_REG_X16 */ | |
str x17, [x0, 0x10] /* FIBER_REG_X17 */ | |
str x18, [x0, 0x18] /* FIBER_REG_X18 */ | |
str x19, [x0, 0x20] /* FIBER_REG_X19 */ | |
str x20, [x0, 0x28] /* FIBER_REG_X20 */ | |
str x21, [x0, 0x30] /* FIBER_REG_X21 */ | |
str x22, [x0, 0x38] /* FIBER_REG_X22 */ | |
str x23, [x0, 0x40] /* FIBER_REG_X23 */ | |
str x24, [x0, 0x48] /* FIBER_REG_X24 */ | |
str x25, [x0, 0x50] /* FIBER_REG_X25 */ | |
str x26, [x0, 0x58] /* FIBER_REG_X26 */ | |
str x27, [x0, 0x60] /* FIBER_REG_X27 */ | |
str x28, [x0, 0x68] /* FIBER_REG_X28 */ | |
str x29, [x0, 0x70] /* FIBER_REG_X29 */ | |
str d8, [x0, 0x80] /* FIBER_REG_V8 */ | |
str d9, [x0, 0x88] /* FIBER_REG_V9 */ | |
str d10, [x0, 0x90] /* FIBER_REG_V10 */ | |
str d11, [x0, 0x98] /* FIBER_REG_V11 */ | |
str d12, [x0, 0xa0] /* FIBER_REG_V12 */ | |
str d13, [x0, 0xa8] /* FIBER_REG_V13 */ | |
str d14, [x0, 0xb0] /* FIBER_REG_V14 */ | |
str d15, [x0, 0xb8] /* FIBER_REG_V15 */ | |
// store sp and lr | |
mov x2, sp | |
str x2, [x0, 0xc0] /* FIBER_REG_SP */ | |
str x30, [x0, 0x78] /* FIBER_REG_X30 */ | |
// load context 'to' | |
mov x7, x1 | |
ldr x16, [x7, 0x08] /* FIBER_REG_X16 */ | |
ldr x17, [x7, 0x10] /* FIBER_REG_X17 */ | |
ldr x18, [x7, 0x18] /* FIBER_REG_X18 */ | |
ldr x19, [x7, 0x20] /* FIBER_REG_X19 */ | |
ldr x20, [x7, 0x28] /* FIBER_REG_X20 */ | |
ldr x21, [x7, 0x30] /* FIBER_REG_X21 */ | |
ldr x22, [x7, 0x38] /* FIBER_REG_X22 */ | |
ldr x23, [x7, 0x40] /* FIBER_REG_X23 */ | |
ldr x24, [x7, 0x48] /* FIBER_REG_X24 */ | |
ldr x25, [x7, 0x50] /* FIBER_REG_X25 */ | |
ldr x26, [x7, 0x58] /* FIBER_REG_X26 */ | |
ldr x27, [x7, 0x60] /* FIBER_REG_X27 */ | |
ldr x28, [x7, 0x68] /* FIBER_REG_X28 */ | |
ldr x29, [x7, 0x70] /* FIBER_REG_X29 */ | |
ldr d8, [x7, 0x80] /* FIBER_REG_V8 */ | |
ldr d9, [x7, 0x88] /* FIBER_REG_V9 */ | |
ldr d10, [x7, 0x90] /* FIBER_REG_V10 */ | |
ldr d11, [x7, 0x98] /* FIBER_REG_V11 */ | |
ldr d12, [x7, 0xa0] /* FIBER_REG_V12 */ | |
ldr d13, [x7, 0xa8] /* FIBER_REG_V13 */ | |
ldr d14, [x7, 0xb0] /* FIBER_REG_V14 */ | |
ldr d15, [x7, 0xb8] /* FIBER_REG_V15 */ | |
// Load first parameter, this is only used for the first time a fiber gains control | |
ldr x0, [x7, 0x00] /* FIBER_REG_X0 */ | |
ldr x30, [x7, 0x78] /* FIBER_REG_X30 */ | |
ldr x2, [x7, 0xc0] /* FIBER_REG_SP */ | |
mov sp, x2 | |
ret | |
)"); | |
#elif defined(FIBER_ASM_X64_IMPLEMENTATION) | |
#define FIBER_ASM_IMPLEMENTATION | |
#define FIBER_REG_RBX 0x00 | |
#define FIBER_REG_RBP 0x08 | |
#define FIBER_REG_R12 0x10 | |
#define FIBER_REG_R13 0x18 | |
#define FIBER_REG_R14 0x20 | |
#define FIBER_REG_R15 0x28 | |
#define FIBER_REG_RDI 0x30 | |
#define FIBER_REG_RSP 0x38 | |
#define FIBER_REG_RIP 0x40 | |
//! Fiber context that saves all the callee saved registers | |
/** | |
* The specific set of register is architecture and OS dependent. SORT uses this implementation for | |
* Intel Mac and X64 Ubuntu, which use 'System V AMD64 ABI'. | |
* https://en.wikipedia.org/wiki/X86_calling_conventions#cite_note-AMD-28 | |
* | |
* System V Application Binary Interface AMD64 Architecture Processor Supplement | |
* Page 23, AMD64 ABI Draft 1.0 | |
* https://github.com/hjl-tools/x86-psABI/wiki/x86-64-psABI-1.0.pdf | |
*/ | |
struct FiberContexInternal { | |
// callee-saved registers | |
Register rbx; | |
Register rbp; | |
Register r12; | |
Register r13; | |
Register r14; | |
Register r15; | |
// parameter registers | |
Register rdi; | |
// stack and instruction registers | |
Register rsp; | |
Register rip; | |
}; | |
CHECK_OFFSET(rbx, FIBER_REG_RBX); | |
CHECK_OFFSET(rbp, FIBER_REG_RBP); | |
CHECK_OFFSET(r12, FIBER_REG_R12); | |
CHECK_OFFSET(r13, FIBER_REG_R13); | |
CHECK_OFFSET(r14, FIBER_REG_R14); | |
CHECK_OFFSET(r15, FIBER_REG_R15); | |
CHECK_OFFSET(rdi, FIBER_REG_RDI); | |
CHECK_OFFSET(rsp, FIBER_REG_RSP); | |
CHECK_OFFSET(rip, FIBER_REG_RIP); | |
// create a new fiber | |
inline bool _create_fiber_internal(void* stack, uint32_t stack_size, void (*target)(void*), void* arg, FiberContexInternal* context) { | |
// it is the users responsibility to make sure the stack is 16 bytes aligned, which is required by the Arm64 architecture | |
if((((uintptr_t)stack) & (FIBER_STACK_ALIGNMENT - 1)) != 0) | |
return false; | |
uintptr_t* stack_top = (uintptr_t*)((uint8_t*)(stack) + stack_size); | |
context->rip = (uintptr_t)target; | |
context->rdi = (uintptr_t)arg; | |
context->rsp = (uintptr_t)&stack_top[-3]; | |
stack_top[-2] = 0; | |
return true; | |
} | |
// switching to a different fiber | |
asm( | |
R"( | |
.text | |
.align 4 | |
_switch_fiber_internal: | |
// Save context 'from' | |
// Store callee-preserved registers | |
movq %rbx, 0x00(%rdi) /* FIBER_REG_RBX */ | |
movq %rbp, 0x08(%rdi) /* FIBER_REG_RBP */ | |
movq %r12, 0x10(%rdi) /* FIBER_REG_R12 */ | |
movq %r13, 0x18(%rdi) /* FIBER_REG_R13 */ | |
movq %r14, 0x20(%rdi) /* FIBER_REG_R14 */ | |
movq %r15, 0x28(%rdi) /* FIBER_REG_R15 */ | |
/* call stores the return address on the stack before jumping */ | |
movq (%rsp), %rcx | |
movq %rcx, 0x40(%rdi) /* FIBER_REG_RIP */ | |
/* skip the pushed return address */ | |
leaq 8(%rsp), %rcx | |
movq %rcx, 0x38(%rdi) /* FIBER_REG_RSP */ | |
// Load context 'to' | |
movq %rsi, %r8 | |
// Load callee-preserved registers | |
movq 0x00(%r8), %rbx /* FIBER_REG_RBX */ | |
movq 0x08(%r8), %rbp /* FIBER_REG_RBP */ | |
movq 0x10(%r8), %r12 /* FIBER_REG_R12 */ | |
movq 0x18(%r8), %r13 /* FIBER_REG_R13 */ | |
movq 0x20(%r8), %r14 /* FIBER_REG_R14 */ | |
movq 0x28(%r8), %r15 /* FIBER_REG_R15 */ | |
// Load first parameter, this is only used for the first time a fiber gains control | |
movq 0x30(%r8), %rdi /* FIBER_REG_RDI */ | |
// Load stack pointer | |
movq 0x38(%r8), %rsp /* FIBER_REG_RSP */ | |
// Load instruction pointer, and jump | |
movq 0x40(%r8), %rcx /* FIBER_REG_RIP */ | |
jmp *%rcx | |
)"); | |
#elif defined(TINY_FIBER_WIN) | |
struct FiberContexInternal { | |
// handle to hold fiber | |
LPVOID raw_fiber_handle = nullptr; | |
}; | |
#endif | |
#if defined(FIBER_ASM_IMPLEMENTATION) | |
#if __has_attribute (optnone) | |
#define FORCENOTINLINE __attribute__((optnone)) | |
#elif __has_attribute (noinline) | |
#define FORCENOTINLINE __attribute__((noinline)) | |
#else | |
#define FORCENOTINLINE | |
#endif | |
extern "C" | |
{ | |
extern void FORCENOTINLINE _switch_fiber_internal(FiberContexInternal* from, const FiberContexInternal* to); | |
} | |
#endif | |
//! Abstruction for fiber struct. | |
struct Fiber { | |
/**< fiber context, this is platform dependent. */ | |
FiberContexInternal context; | |
#if defined(FIBER_ASM_IMPLEMENTATION) | |
/**< Pointer to stack. */ | |
void* stack_ptr = nullptr; | |
/**< Stack size. */ | |
unsigned int stack_size = 0; | |
#elif defined(TINY_FIBER_WIN) | |
// whether the fiber is originated from a thread or not | |
bool is_fiber_from_thread = false; | |
#endif | |
}; | |
// Define fiber handle | |
typedef Fiber* FiberHandle; | |
//! Create a new fiber. | |
//! | |
//! Allocate stack memory for the fiber. If there is no valid function pointer provided, it will fail. | |
inline FiberHandle CreateFiber(uint32_t stack_size, void (*fiber_func)(void*), void* arg) { | |
if(stack_size == 0 || !fiber_func || !arg) | |
return nullptr; | |
Fiber* ptr = (Fiber*)TINY_FIBER_MALLOC(sizeof(Fiber)); | |
ptr->context = {}; | |
#if defined(FIBER_ASM_IMPLEMENTATION) | |
ptr->stack_ptr = TINY_FIBER_MALLOC(stack_size + FIBER_STACK_ALIGNMENT - 1); | |
ptr->stack_size = stack_size; | |
if(!ptr->stack_ptr) | |
return nullptr; | |
// Make sure the stack meets the alignment requirement | |
uintptr_t aligned_stack_ptr = (uintptr_t)ptr->stack_ptr; | |
aligned_stack_ptr += FIBER_STACK_ALIGNMENT - 1; | |
aligned_stack_ptr &= ~(FIBER_STACK_ALIGNMENT - 1); | |
if(!_create_fiber_internal((void*)aligned_stack_ptr, stack_size, fiber_func, arg, &ptr->context)) | |
return nullptr; | |
#elif defined(TINY_FIBER_WIN) | |
ptr->context.raw_fiber_handle = ::CreateFiber(stack_size, fiber_func, arg); | |
ptr->is_fiber_from_thread = false; | |
#endif | |
return ptr; | |
} | |
//! Convert the current thread to fiber. | |
//! | |
//! Note, on Ubuntu and Mac, this doesn't really convert the current thread to a new fiber, it really just creates a brand new fiber that has nothing to do | |
//! with the current thread. However, as long as the thread first switch to a fiber from this created fiber, this would allow the thread fiber to capture | |
//! the thread context. | |
inline FiberHandle CreateFiberFromThread() { | |
Fiber* ptr = (Fiber*)TINY_FIBER_MALLOC(sizeof(Fiber)); | |
#if defined(FIBER_ASM_IMPLEMENTATION) | |
ptr->context = {}; | |
ptr->stack_ptr = nullptr; | |
ptr->stack_size = 0; | |
#elif defined(TINY_FIBER_WIN) | |
ptr->context.raw_fiber_handle = ConvertThreadToFiber(nullptr); | |
ptr->is_fiber_from_thread = true; | |
#endif | |
return ptr; | |
} | |
//! Switch from one fiber to another different fiber | |
//! | |
//! The upper level logic should have checked for same fiber switch. The low level implementation defined here won't do such a check. In the case of | |
//! switching to a same fiber, it should not crash the system. But there could be some loss of performance. Another more important thing that derserve our | |
//! attention is that the high level code will have to make sure the from_fiber is the current executing fiber, otherwise there will be undefined behavior. | |
inline void SwitchFiber(Fiber* from_fiber, const Fiber* to_fiber) { | |
#if defined(FIBER_ASM_IMPLEMENTATION) | |
_switch_fiber_internal(&from_fiber->context, &to_fiber->context); | |
#elif defined(TINY_FIBER_WIN) | |
::SwitchToFiber(to_fiber->context.raw_fiber_handle); | |
#endif | |
} | |
//! Delete a fiber | |
//! | |
//! If the fiber is converted from a thread, delete fiber will convert the fiber back to a regular thread then. | |
inline void DeleteFiber(FiberHandle fiber_handle){ | |
if(!fiber_handle) | |
return; | |
#if defined(TINY_FIBER_WIN) | |
if (fiber_handle->is_fiber_from_thread) | |
ConvertFiberToThread(); | |
else | |
::DeleteFiber(fiber_handle->context.raw_fiber_handle); | |
fiber_handle->context.raw_fiber_handle = nullptr; | |
fiber_handle->is_fiber_from_thread = false; | |
#elif defined(FIBER_ASM_IMPLEMENTATION) | |
if(fiber_handle->stack_ptr){ | |
TINY_FIBER_FREE(fiber_handle->stack_ptr); | |
fiber_handle->stack_ptr = nullptr; | |
} | |
#endif | |
TINY_FIBER_FREE(fiber_handle); | |
} | |
} // namespace tiny_fiber |
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