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setup.cfa @ d611995

ADTarm-ehast-experimentalenumforall-pointer-decayjacob/cs343-translationnew-ast-unique-exprpthread-emulationqualifiedEnum

Last change on this file since d611995 was d611995, checked in by Thierry Delisle <tdelisle@…>, 3 years ago
Fix crash on cluster exit. (Added epoch based blocking to iopoll.)
Property mode set to `100644`
File size: 18.7 KB

Rev	Line
[3e2b9c9]	1	//
	2	// Cforall Version 1.0.0 Copyright (C) 2020 University of Waterloo
	3	//
	4	// The contents of this file are covered under the licence agreement in the
	5	// file "LICENCE" distributed with Cforall.
	6	//
	7	// io/setup.cfa --
	8	//
	9	// Author : Thierry Delisle
	10	// Created On : Fri Jul 31 16:25:51 2020
	11	// Last Modified By :
	12	// Last Modified On :
	13	// Update Count :
	14	//
	15
	16	#define __cforall_thread__
	17	#define _GNU_SOURCE /* See feature_test_macros(7) */
	18
[80444bb]	19	#if defined(__CFA_DEBUG__)
	20	// #define __CFA_DEBUG_PRINT_IO__
	21	// #define __CFA_DEBUG_PRINT_IO_CORE__
	22	#endif
	23
[3e2b9c9]	24	#include "io/types.hfa"
[c44d652]	25	#include "kernel.hfa"
[3e2b9c9]	26
	27	#if !defined(CFA_HAVE_LINUX_IO_URING_H)
	28	void __kernel_io_startup() {
	29	// Nothing to do without io_uring
	30	}
	31
	32	void __kernel_io_shutdown() {
	33	// Nothing to do without io_uring
	34	}
	35
[f277633e]	36	void ?{}(io_context_params & this) {}
	37
[3e2b9c9]	38	void ?{}(io_context & this, struct cluster & cl) {}
	39	void ?{}(io_context & this, struct cluster & cl, const io_context_params & params) {}
	40
	41	void ^?{}(io_context & this) {}
	42	void ^?{}(io_context & this, bool cluster_context) {}
	43
[b7664a0]	44	void register_fixed_files( io_context &, int *, unsigned ) {}
	45	void register_fixed_files( cluster &, int *, unsigned ) {}
	46
[3e2b9c9]	47	#else
	48	#include <errno.h>
	49	#include <stdint.h>
	50	#include <string.h>
	51	#include <signal.h>
	52	#include <unistd.h>
	53
	54	extern "C" {
	55	#include <pthread.h>
	56	#include <sys/epoll.h>
[426f60c]	57	#include <sys/eventfd.h>
[3e2b9c9]	58	#include <sys/mman.h>
	59	#include <sys/syscall.h>
	60
	61	#include <linux/io_uring.h>
	62	}
	63
	64	#include "bitmanip.hfa"
	65	#include "kernel_private.hfa"
	66	#include "thread.hfa"
	67
	68	void ?{}(io_context_params & this) {
	69	this.num_entries = 256;
	70	this.num_ready = 256;
	71	this.submit_aff = -1;
	72	this.eager_submits = false;
	73	this.poller_submits = false;
	74	this.poll_submit = false;
	75	this.poll_complete = false;
	76	}
	77
	78	static void * __io_poller_slow( void * arg );
	79
	80	// Weirdly, some systems that do support io_uring don't actually define these
	81	#ifdef __alpha__
	82	/*
	83	* alpha is the only exception, all other architectures
	84	* have common numbers for new system calls.
	85	*/
	86	#ifndef __NR_io_uring_setup
	87	#define __NR_io_uring_setup 535
	88	#endif
	89	#ifndef __NR_io_uring_enter
	90	#define __NR_io_uring_enter 536
	91	#endif
	92	#ifndef __NR_io_uring_register
	93	#define __NR_io_uring_register 537
	94	#endif
	95	#else /* !__alpha__ */
	96	#ifndef __NR_io_uring_setup
	97	#define __NR_io_uring_setup 425
	98	#endif
	99	#ifndef __NR_io_uring_enter
	100	#define __NR_io_uring_enter 426
	101	#endif
	102	#ifndef __NR_io_uring_register
	103	#define __NR_io_uring_register 427
	104	#endif
	105	#endif
	106
	107	//=============================================================================================
	108	// I/O Startup / Shutdown logic + Master Poller
	109	//=============================================================================================
	110
	111	// IO Master poller loop forward
	112	static void * iopoll_loop( __attribute__((unused)) void * args );
	113
	114	static struct {
[d611995]	115	pthread_t thrd; // pthread handle to io poller thread
	116	void * stack; // pthread stack for io poller thread
	117	int epollfd; // file descriptor to the epoll instance
	118	volatile bool run; // Whether or not to continue
	119	volatile size_t epoch; // Epoch used for memory reclamation
[3e2b9c9]	120	} iopoll;
	121
	122	void __kernel_io_startup(void) {
[80444bb]	123	__cfadbg_print_safe(io_core, "Kernel : Creating EPOLL instance\n" );
[3e2b9c9]	124
	125	iopoll.epollfd = epoll_create1(0);
	126	if (iopoll.epollfd == -1) {
	127	abort( "internal error, epoll_create1\n");
	128	}
	129
[80444bb]	130	__cfadbg_print_safe(io_core, "Kernel : Starting io poller thread\n" );
[3e2b9c9]	131
	132	iopoll.run = true;
	133	iopoll.stack = __create_pthread( &iopoll.thrd, iopoll_loop, 0p );
[d611995]	134	iopoll.epoch = 0;
[3e2b9c9]	135	}
	136
	137	void __kernel_io_shutdown(void) {
	138	// Notify the io poller thread of the shutdown
	139	iopoll.run = false;
	140	sigval val = { 1 };
	141	pthread_sigqueue( iopoll.thrd, SIGUSR1, val );
	142
	143	// Wait for the io poller thread to finish
	144
[bfcf6b9]	145	__destroy_pthread( iopoll.thrd, iopoll.stack, 0p );
[3e2b9c9]	146
	147	int ret = close(iopoll.epollfd);
	148	if (ret == -1) {
	149	abort( "internal error, close epoll\n");
	150	}
	151
	152	// Io polling is now fully stopped
	153
[80444bb]	154	__cfadbg_print_safe(io_core, "Kernel : IO poller stopped\n" );
[3e2b9c9]	155	}
	156
	157	static void * iopoll_loop( __attribute__((unused)) void * args ) {
	158	__processor_id_t id;
[58d64a4]	159	id.full_proc = false;
[3e2b9c9]	160	id.id = doregister(&id);
[8fc652e0]	161	__cfaabi_tls.this_proc_id = &id;
[80444bb]	162	__cfadbg_print_safe(io_core, "Kernel : IO poller thread starting\n" );
[3e2b9c9]	163
	164	// Block signals to control when they arrive
	165	sigset_t mask;
	166	sigfillset(&mask);
	167	if ( pthread_sigmask( SIG_BLOCK, &mask, 0p ) == -1 ) {
	168	abort( "internal error, pthread_sigmask" );
	169	}
	170
	171	sigdelset( &mask, SIGUSR1 );
	172
	173	// Create sufficient events
	174	struct epoll_event events[10];
	175	// Main loop
	176	while( iopoll.run ) {
[ece0e80]	177	__cfadbg_print_safe(io_core, "Kernel I/O - epoll : waiting on io_uring contexts\n");
	178
[d611995]	179	// increment the epoch to notify any deleters we are starting a new cycle
	180	__atomic_fetch_add(&iopoll.epoch, 1, __ATOMIC_SEQ_CST);
	181
[3e2b9c9]	182	// Wait for events
	183	int nfds = epoll_pwait( iopoll.epollfd, events, 10, -1, &mask );
	184
[ece0e80]	185	__cfadbg_print_safe(io_core, "Kernel I/O - epoll : %d io contexts events, waking up\n", nfds);
	186
[3e2b9c9]	187	// Check if an error occured
	188	if (nfds == -1) {
	189	if( errno == EINTR ) continue;
	190	abort( "internal error, pthread_sigmask" );
	191	}
	192
	193	for(i; nfds) {
	194	$io_ctx_thread * io_ctx = ($io_ctx_thread *)(uintptr_t)events[i].data.u64;
	195	/* paranoid */ verify( io_ctx );
[426f60c]	196	__cfadbg_print_safe(io_core, "Kernel I/O - epoll : Unparking io poller %d (%p)\n", io_ctx->ring->fd, io_ctx);
[3e2b9c9]	197	#if !defined( __CFA_NO_STATISTICS__ )
[8fc652e0]	198	__cfaabi_tls.this_stats = io_ctx->self.curr_cluster->stats;
[3e2b9c9]	199	#endif
[d48b174]	200
	201	eventfd_t v;
	202	eventfd_read(io_ctx->ring->efd, &v);
	203
[e873838]	204	post( io_ctx->sem );
[3e2b9c9]	205	}
	206	}
	207
[80444bb]	208	__cfadbg_print_safe(io_core, "Kernel : IO poller thread stopping\n" );
[3e2b9c9]	209	unregister(&id);
	210	return 0p;
	211	}
	212
	213	//=============================================================================================
	214	// I/O Context Constrution/Destruction
	215	//=============================================================================================
	216
	217	void ?{}($io_ctx_thread & this, struct cluster & cl) { (this.self){ "IO Poller", cl }; }
	218	void main( $io_ctx_thread & this );
	219	static inline $thread * get_thread( $io_ctx_thread & this ) { return &this.self; }
	220	void ^?{}( $io_ctx_thread & mutex this ) {}
	221
	222	static void __io_create ( __io_data & this, const io_context_params & params_in );
	223	static void __io_destroy( __io_data & this );
	224
	225	void ?{}(io_context & this, struct cluster & cl, const io_context_params & params) {
	226	(this.thrd){ cl };
	227	this.thrd.ring = malloc();
	228	__cfadbg_print_safe(io_core, "Kernel I/O : Creating ring for io_context %p\n", &this);
	229	__io_create( *this.thrd.ring, params );
	230
	231	__cfadbg_print_safe(io_core, "Kernel I/O : Starting poller thread for io_context %p\n", &this);
	232	this.thrd.done = false;
	233	__thrd_start( this.thrd, main );
	234
	235	__cfadbg_print_safe(io_core, "Kernel I/O : io_context %p ready\n", &this);
	236	}
	237
	238	void ?{}(io_context & this, struct cluster & cl) {
	239	io_context_params params;
	240	(this){ cl, params };
	241	}
	242
	243	void ^?{}(io_context & this, bool cluster_context) {
	244	__cfadbg_print_safe(io_core, "Kernel I/O : tearing down io_context %p\n", &this);
	245
	246	// Notify the thread of the shutdown
	247	__atomic_store_n(&this.thrd.done, true, __ATOMIC_SEQ_CST);
	248
	249	// If this is an io_context within a cluster, things get trickier
	250	$thread & thrd = this.thrd.self;
	251	if( cluster_context ) {
[ece0e80]	252	// We are about to do weird things with the threads
	253	// we don't need interrupts to complicate everything
	254	disable_interrupts();
	255
	256	// Get cluster info
[3e2b9c9]	257	cluster & cltr = *thrd.curr_cluster;
[1eb239e4]	258	/* paranoid */ verify( cltr.idles.total == 0 \|\| &cltr == mainCluster );
[3e2b9c9]	259	/* paranoid */ verify( !ready_mutate_islocked() );
	260
	261	// We need to adjust the clean-up based on where the thread is
	262	if( thrd.state == Ready \|\| thrd.preempted != __NO_PREEMPTION ) {
[ece0e80]	263	// This is the tricky case
	264	// The thread was preempted or ready to run and now it is on the ready queue
	265	// but the cluster is shutting down, so there aren't any processors to run the ready queue
	266	// the solution is to steal the thread from the ready-queue and pretend it was blocked all along
[3e2b9c9]	267
[e873838]	268	ready_schedule_lock();
[ece0e80]	269	// The thread should on the list
[3e2b9c9]	270	/* paranoid */ verify( thrd.link.next != 0p );
	271
	272	// Remove the thread from the ready queue of this cluster
[ece0e80]	273	// The thread should be the last on the list
[3e2b9c9]	274	__attribute__((unused)) bool removed = remove_head( &cltr, &thrd );
	275	/* paranoid */ verify( removed );
	276	thrd.link.next = 0p;
	277	thrd.link.prev = 0p;
	278
	279	// Fixup the thread state
	280	thrd.state = Blocked;
[6a77224]	281	thrd.ticket = TICKET_BLOCKED;
[3e2b9c9]	282	thrd.preempted = __NO_PREEMPTION;
	283
[e873838]	284	ready_schedule_unlock();
[3e2b9c9]	285
	286	// Pretend like the thread was blocked all along
	287	}
	288	// !!! This is not an else if !!!
[ece0e80]	289	// Ok, now the thread is blocked (whether we cheated to get here or not)
[3e2b9c9]	290	if( thrd.state == Blocked ) {
	291	// This is the "easy case"
	292	// The thread is parked and can easily be moved to active cluster
	293	verify( thrd.curr_cluster != active_cluster() \|\| thrd.curr_cluster == mainCluster );
	294	thrd.curr_cluster = active_cluster();
	295
	296	// unpark the fast io_poller
[0d72d45]	297	unpark( &thrd );
[3e2b9c9]	298	}
	299	else {
	300	// The thread is in a weird state
	301	// I don't know what to do here
	302	abort("io_context poller thread is in unexpected state, cannot clean-up correctly\n");
	303	}
[ece0e80]	304
	305	// The weird thread kidnapping stuff is over, restore interrupts.
	306	enable_interrupts( __cfaabi_dbg_ctx );
[3e2b9c9]	307	} else {
[3c80ccc]	308	post( this.thrd.sem );
[3e2b9c9]	309	}
	310
	311	^(this.thrd){};
	312	__cfadbg_print_safe(io_core, "Kernel I/O : Stopped poller thread for io_context %p\n", &this);
	313
	314	__io_destroy( *this.thrd.ring );
	315	__cfadbg_print_safe(io_core, "Kernel I/O : Destroyed ring for io_context %p\n", &this);
	316
	317	free(this.thrd.ring);
	318	}
	319
	320	void ^?{}(io_context & this) {
	321	^(this){ false };
	322	}
	323
[7222630]	324	extern void __disable_interrupts_hard();
	325	extern void __enable_interrupts_hard();
[bb58825]	326
[3e2b9c9]	327	static void __io_create( __io_data & this, const io_context_params & params_in ) {
	328	// Step 1 : call to setup
	329	struct io_uring_params params;
	330	memset(&params, 0, sizeof(params));
	331	if( params_in.poll_submit ) params.flags \|= IORING_SETUP_SQPOLL;
	332	if( params_in.poll_complete ) params.flags \|= IORING_SETUP_IOPOLL;
	333
[4998155]	334	__u32 nentries = params_in.num_entries != 0 ? params_in.num_entries : 256;
[63fe427c]	335	if( !is_pow2(nentries) ) {
	336	abort("ERROR: I/O setup 'num_entries' must be a power of 2\n");
	337	}
	338	if( params_in.poller_submits && params_in.eager_submits ) {
	339	abort("ERROR: I/O setup 'poller_submits' and 'eager_submits' cannot be used together\n");
	340	}
[3e2b9c9]	341
	342	int fd = syscall(__NR_io_uring_setup, nentries, &params );
	343	if(fd < 0) {
	344	abort("KERNEL ERROR: IO_URING SETUP - %s\n", strerror(errno));
	345	}
	346
	347	// Step 2 : mmap result
	348	memset( &this, 0, sizeof(struct __io_data) );
	349	struct __submition_data & sq = this.submit_q;
	350	struct __completion_data & cq = this.completion_q;
	351
	352	// calculate the right ring size
	353	sq.ring_sz = params.sq_off.array + (params.sq_entries * sizeof(unsigned) );
	354	cq.ring_sz = params.cq_off.cqes + (params.cq_entries * sizeof(struct io_uring_cqe));
	355
	356	// Requires features
	357	#if defined(IORING_FEAT_SINGLE_MMAP)
	358	// adjust the size according to the parameters
	359	if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) {
	360	cq.ring_sz = sq.ring_sz = max(cq.ring_sz, sq.ring_sz);
	361	}
	362	#endif
	363
	364	// mmap the Submit Queue into existence
	365	sq.ring_ptr = mmap(0, sq.ring_sz, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_SQ_RING);
	366	if (sq.ring_ptr == (void*)MAP_FAILED) {
	367	abort("KERNEL ERROR: IO_URING MMAP1 - %s\n", strerror(errno));
	368	}
	369
	370	// Requires features
	371	#if defined(IORING_FEAT_SINGLE_MMAP)
	372	// mmap the Completion Queue into existence (may or may not be needed)
	373	if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) {
	374	cq.ring_ptr = sq.ring_ptr;
	375	}
	376	else
	377	#endif
	378	{
	379	// We need multiple call to MMAP
	380	cq.ring_ptr = mmap(0, cq.ring_sz, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_CQ_RING);
	381	if (cq.ring_ptr == (void*)MAP_FAILED) {
	382	munmap(sq.ring_ptr, sq.ring_sz);
	383	abort("KERNEL ERROR: IO_URING MMAP2 - %s\n", strerror(errno));
	384	}
	385	}
	386
	387	// mmap the submit queue entries
	388	size_t size = params.sq_entries * sizeof(struct io_uring_sqe);
	389	sq.sqes = (struct io_uring_sqe *)mmap(0, size, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_SQES);
	390	if (sq.sqes == (struct io_uring_sqe *)MAP_FAILED) {
	391	munmap(sq.ring_ptr, sq.ring_sz);
	392	if (cq.ring_ptr != sq.ring_ptr) munmap(cq.ring_ptr, cq.ring_sz);
	393	abort("KERNEL ERROR: IO_URING MMAP3 - %s\n", strerror(errno));
	394	}
	395
[426f60c]	396	// Step 3 : Initialize the data structure
[3e2b9c9]	397	// Get the pointers from the kernel to fill the structure
	398	// submit queue
[4998155]	399	sq.head = (volatile __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.head);
	400	sq.tail = (volatile __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.tail);
	401	sq.mask = ( const __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_mask);
	402	sq.num = ( const __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_entries);
	403	sq.flags = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.flags);
	404	sq.dropped = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.dropped);
	405	sq.array = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.array);
[3e2b9c9]	406	sq.prev_head = *sq.head;
	407
	408	{
[4998155]	409	const __u32 num = *sq.num;
[3e2b9c9]	410	for( i; num ) {
[ec19b21]	411	__sqe_clean( &sq.sqes[i] );
[3e2b9c9]	412	}
	413	}
	414
[2fafe7e]	415	(sq.submit_lock){};
[3e2b9c9]	416	(sq.release_lock){};
	417
	418	if( params_in.poller_submits \|\| params_in.eager_submits ) {
	419	/* paranoid */ verify( is_pow2( params_in.num_ready ) \|\| (params_in.num_ready < 8) );
	420	sq.ready_cnt = max( params_in.num_ready, 8 );
[ceb7db8]	421	sq.ready = alloc( sq.ready_cnt, 64`align );
[3e2b9c9]	422	for(i; sq.ready_cnt) {
	423	sq.ready[i] = -1ul32;
	424	}
[1095ccd]	425	sq.prev_ready = 0;
[3e2b9c9]	426	}
	427	else {
	428	sq.ready_cnt = 0;
	429	sq.ready = 0p;
[1095ccd]	430	sq.prev_ready = 0;
[3e2b9c9]	431	}
	432
	433	// completion queue
[4998155]	434	cq.head = (volatile __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.head);
	435	cq.tail = (volatile __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.tail);
	436	cq.mask = ( const __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_mask);
	437	cq.num = ( const __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_entries);
	438	cq.overflow = ( __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.overflow);
	439	cq.cqes = (struct io_uring_cqe *)(((intptr_t)cq.ring_ptr) + params.cq_off.cqes);
[3e2b9c9]	440
[426f60c]	441	// Step 4 : eventfd
[bb58825]	442	// io_uring_register is so f*cking slow on some machine that it
	443	// will never succeed if preemption isn't hard blocked
[7222630]	444	__disable_interrupts_hard();
[bb58825]	445
	446	int efd = eventfd(0, 0);
	447	if (efd < 0) {
	448	abort("KERNEL ERROR: IO_URING EVENTFD - %s\n", strerror(errno));
[426f60c]	449	}
	450
[bb58825]	451	int ret = syscall( __NR_io_uring_register, fd, IORING_REGISTER_EVENTFD, &efd, 1);
	452	if (ret < 0) {
	453	abort("KERNEL ERROR: IO_URING EVENTFD REGISTER - %s\n", strerror(errno));
[426f60c]	454	}
	455
[7222630]	456	__enable_interrupts_hard();
[bb58825]	457
[3e2b9c9]	458	// some paranoid checks
	459	/* paranoid / verifyf( (cq.mask) == ((cq.num) - 1ul32), "IO_URING Expected mask to be %u (%u entries), was %u", (cq.num) - 1ul32, cq.num, cq.mask );
	460	/* paranoid / verifyf( (cq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *cq.num );
	461	/* paranoid / verifyf( (cq.head) == 0, "IO_URING Expected head to be 0, got %u", *cq.head );
	462	/* paranoid / verifyf( (cq.tail) == 0, "IO_URING Expected tail to be 0, got %u", *cq.tail );
	463
	464	/* paranoid / verifyf( (sq.mask) == ((sq.num) - 1ul32), "IO_URING Expected mask to be %u (%u entries), was %u", (sq.num) - 1ul32, sq.num, sq.mask );
	465	/* paranoid / verifyf( (sq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *sq.num );
	466	/* paranoid / verifyf( (sq.head) == 0, "IO_URING Expected head to be 0, got %u", *sq.head );
	467	/* paranoid / verifyf( (sq.tail) == 0, "IO_URING Expected tail to be 0, got %u", *sq.tail );
	468
	469	// Update the global ring info
	470	this.ring_flags = params.flags;
	471	this.fd = fd;
[426f60c]	472	this.efd = efd;
[3e2b9c9]	473	this.eager_submits = params_in.eager_submits;
	474	this.poller_submits = params_in.poller_submits;
	475	}
	476
	477	static void __io_destroy( __io_data & this ) {
	478	// Shutdown the io rings
	479	struct __submition_data & sq = this.submit_q;
	480	struct __completion_data & cq = this.completion_q;
	481
	482	// unmap the submit queue entries
	483	munmap(sq.sqes, (sq.num) sizeof(struct io_uring_sqe));
	484
	485	// unmap the Submit Queue ring
	486	munmap(sq.ring_ptr, sq.ring_sz);
	487
	488	// unmap the Completion Queue ring, if it is different
	489	if (cq.ring_ptr != sq.ring_ptr) {
	490	munmap(cq.ring_ptr, cq.ring_sz);
	491	}
	492
	493	// close the file descriptor
	494	close(this.fd);
[426f60c]	495	close(this.efd);
[3e2b9c9]	496
	497	free( this.submit_q.ready ); // Maybe null, doesn't matter
	498	}
	499
	500	//=============================================================================================
	501	// I/O Context Sleep
	502	//=============================================================================================
[d48b174]	503	static inline void __ioctx_epoll_ctl($io_ctx_thread & ctx, int op, const char * error) {
	504	struct epoll_event ev;
[d611995]	505	ev.events = EPOLLIN \| EPOLLONESHOT;
[4998155]	506	ev.data.u64 = (__u64)&ctx;
[d48b174]	507	int ret = epoll_ctl(iopoll.epollfd, op, ctx.ring->efd, &ev);
[3e2b9c9]	508	if (ret < 0) {
[d48b174]	509	abort( "KERNEL ERROR: EPOLL %s - (%d) %s\n", error, (int)errno, strerror(errno) );
[3e2b9c9]	510	}
	511	}
	512
[d48b174]	513	void __ioctx_register($io_ctx_thread & ctx) {
	514	__ioctx_epoll_ctl(ctx, EPOLL_CTL_ADD, "ADD");
	515	}
	516
	517	void __ioctx_prepare_block($io_ctx_thread & ctx) {
[426f60c]	518	__cfadbg_print_safe(io_core, "Kernel I/O - epoll : Re-arming io poller %d (%p)\n", ctx.ring->fd, &ctx);
[d48b174]	519	__ioctx_epoll_ctl(ctx, EPOLL_CTL_MOD, "REARM");
[3e2b9c9]	520	}
	521
[d611995]	522	void __ioctx_unregister($io_ctx_thread & ctx) {
	523	// Read the current epoch so we know when to stop
	524	size_t curr = __atomic_load_n(&iopoll.epoch, __ATOMIC_SEQ_CST);
	525
	526	// Remove the fd from the iopoller
	527	__ioctx_epoll_ctl(ctx, EPOLL_CTL_DEL, "REMOVE");
	528
	529	// Notify the io poller thread of the shutdown
	530	iopoll.run = false;
	531	sigval val = { 1 };
	532	pthread_sigqueue( iopoll.thrd, SIGUSR1, val );
	533
	534	// Make sure all this is done
	535	__atomic_thread_fence(__ATOMIC_SEQ_CST);
	536
	537	// Wait for the next epoch
	538	while(curr == __atomic_load_n(&iopoll.epoch, __ATOMIC_RELAXED)) yield();
	539	}
	540
[3e2b9c9]	541	//=============================================================================================
	542	// I/O Context Misc Setup
	543	//=============================================================================================
	544	void register_fixed_files( io_context & ctx, int * files, unsigned count ) {
	545	int ret = syscall( __NR_io_uring_register, ctx.thrd.ring->fd, IORING_REGISTER_FILES, files, count );
	546	if( ret < 0 ) {
	547	abort( "KERNEL ERROR: IO_URING SYSCALL - (%d) %s\n", (int)errno, strerror(errno) );
	548	}
	549
	550	__cfadbg_print_safe( io_core, "Kernel I/O : Performed io_register for %p, returned %d\n", active_thread(), ret );
	551	}
	552
	553	void register_fixed_files( cluster & cltr, int * files, unsigned count ) {
	554	for(i; cltr.io.cnt) {
	555	register_fixed_files( cltr.io.ctxs[i], files, count );
	556	}
	557	}
[c44d652]	558	#endif

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