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setup.cfa @ 79e261b7

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

Last change on this file since 79e261b7 was 4fc3343, checked in by Thierry Delisle <tdelisle@…>, 4 years ago
Fix race with memory reclamation of io_context.
Property mode set to `100644`
File size: 18.9 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 {
[4fc3343]	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 bool stopped; // Whether the poller has finished running
	120	volatile uint64_t epoch; // Epoch used for memory reclamation
[3e2b9c9]	121	} iopoll;
	122
	123	void __kernel_io_startup(void) {
[80444bb]	124	__cfadbg_print_safe(io_core, "Kernel : Creating EPOLL instance\n" );
[3e2b9c9]	125
	126	iopoll.epollfd = epoll_create1(0);
	127	if (iopoll.epollfd == -1) {
	128	abort( "internal error, epoll_create1\n");
	129	}
	130
[80444bb]	131	__cfadbg_print_safe(io_core, "Kernel : Starting io poller thread\n" );
[3e2b9c9]	132
[4fc3343]	133	iopoll.stack = __create_pthread( &iopoll.thrd, iopoll_loop, 0p );
	134	iopoll.run = true;
	135	iopoll.stopped = false;
	136	iopoll.epoch = 0;
[3e2b9c9]	137	}
	138
	139	void __kernel_io_shutdown(void) {
	140	// Notify the io poller thread of the shutdown
	141	iopoll.run = false;
	142	sigval val = { 1 };
	143	pthread_sigqueue( iopoll.thrd, SIGUSR1, val );
	144
	145	// Wait for the io poller thread to finish
	146
[bfcf6b9]	147	__destroy_pthread( iopoll.thrd, iopoll.stack, 0p );
[3e2b9c9]	148
	149	int ret = close(iopoll.epollfd);
	150	if (ret == -1) {
	151	abort( "internal error, close epoll\n");
	152	}
	153
	154	// Io polling is now fully stopped
	155
[80444bb]	156	__cfadbg_print_safe(io_core, "Kernel : IO poller stopped\n" );
[3e2b9c9]	157	}
	158
	159	static void * iopoll_loop( __attribute__((unused)) void * args ) {
	160	__processor_id_t id;
[58d64a4]	161	id.full_proc = false;
[3e2b9c9]	162	id.id = doregister(&id);
[8fc652e0]	163	__cfaabi_tls.this_proc_id = &id;
[80444bb]	164	__cfadbg_print_safe(io_core, "Kernel : IO poller thread starting\n" );
[3e2b9c9]	165
	166	// Block signals to control when they arrive
	167	sigset_t mask;
	168	sigfillset(&mask);
	169	if ( pthread_sigmask( SIG_BLOCK, &mask, 0p ) == -1 ) {
	170	abort( "internal error, pthread_sigmask" );
	171	}
	172
	173	sigdelset( &mask, SIGUSR1 );
	174
	175	// Create sufficient events
	176	struct epoll_event events[10];
	177	// Main loop
	178	while( iopoll.run ) {
[ece0e80]	179	__cfadbg_print_safe(io_core, "Kernel I/O - epoll : waiting on io_uring contexts\n");
	180
[d611995]	181	// increment the epoch to notify any deleters we are starting a new cycle
	182	__atomic_fetch_add(&iopoll.epoch, 1, __ATOMIC_SEQ_CST);
	183
[3e2b9c9]	184	// Wait for events
	185	int nfds = epoll_pwait( iopoll.epollfd, events, 10, -1, &mask );
	186
[ece0e80]	187	__cfadbg_print_safe(io_core, "Kernel I/O - epoll : %d io contexts events, waking up\n", nfds);
	188
[3e2b9c9]	189	// Check if an error occured
	190	if (nfds == -1) {
	191	if( errno == EINTR ) continue;
	192	abort( "internal error, pthread_sigmask" );
	193	}
	194
	195	for(i; nfds) {
	196	$io_ctx_thread * io_ctx = ($io_ctx_thread *)(uintptr_t)events[i].data.u64;
	197	/* paranoid */ verify( io_ctx );
[426f60c]	198	__cfadbg_print_safe(io_core, "Kernel I/O - epoll : Unparking io poller %d (%p)\n", io_ctx->ring->fd, io_ctx);
[3e2b9c9]	199	#if !defined( __CFA_NO_STATISTICS__ )
[8fc652e0]	200	__cfaabi_tls.this_stats = io_ctx->self.curr_cluster->stats;
[3e2b9c9]	201	#endif
[d48b174]	202
	203	eventfd_t v;
	204	eventfd_read(io_ctx->ring->efd, &v);
	205
[e873838]	206	post( io_ctx->sem );
[3e2b9c9]	207	}
	208	}
	209
[4fc3343]	210	__atomic_store_n(&iopoll.stopped, true, __ATOMIC_SEQ_CST);
	211
[80444bb]	212	__cfadbg_print_safe(io_core, "Kernel : IO poller thread stopping\n" );
[3e2b9c9]	213	unregister(&id);
	214	return 0p;
	215	}
	216
	217	//=============================================================================================
	218	// I/O Context Constrution/Destruction
	219	//=============================================================================================
	220
	221	void ?{}($io_ctx_thread & this, struct cluster & cl) { (this.self){ "IO Poller", cl }; }
	222	void main( $io_ctx_thread & this );
	223	static inline $thread * get_thread( $io_ctx_thread & this ) { return &this.self; }
	224	void ^?{}( $io_ctx_thread & mutex this ) {}
	225
	226	static void __io_create ( __io_data & this, const io_context_params & params_in );
	227	static void __io_destroy( __io_data & this );
	228
	229	void ?{}(io_context & this, struct cluster & cl, const io_context_params & params) {
	230	(this.thrd){ cl };
	231	this.thrd.ring = malloc();
	232	__cfadbg_print_safe(io_core, "Kernel I/O : Creating ring for io_context %p\n", &this);
	233	__io_create( *this.thrd.ring, params );
	234
	235	__cfadbg_print_safe(io_core, "Kernel I/O : Starting poller thread for io_context %p\n", &this);
	236	this.thrd.done = false;
	237	__thrd_start( this.thrd, main );
	238
	239	__cfadbg_print_safe(io_core, "Kernel I/O : io_context %p ready\n", &this);
	240	}
	241
	242	void ?{}(io_context & this, struct cluster & cl) {
	243	io_context_params params;
	244	(this){ cl, params };
	245	}
	246
	247	void ^?{}(io_context & this, bool cluster_context) {
	248	__cfadbg_print_safe(io_core, "Kernel I/O : tearing down io_context %p\n", &this);
	249
	250	// Notify the thread of the shutdown
	251	__atomic_store_n(&this.thrd.done, true, __ATOMIC_SEQ_CST);
	252
	253	// If this is an io_context within a cluster, things get trickier
	254	$thread & thrd = this.thrd.self;
	255	if( cluster_context ) {
[ece0e80]	256	// We are about to do weird things with the threads
	257	// we don't need interrupts to complicate everything
	258	disable_interrupts();
	259
	260	// Get cluster info
[3e2b9c9]	261	cluster & cltr = *thrd.curr_cluster;
[1eb239e4]	262	/* paranoid */ verify( cltr.idles.total == 0 \|\| &cltr == mainCluster );
[3e2b9c9]	263	/* paranoid */ verify( !ready_mutate_islocked() );
	264
	265	// We need to adjust the clean-up based on where the thread is
	266	if( thrd.state == Ready \|\| thrd.preempted != __NO_PREEMPTION ) {
[ece0e80]	267	// This is the tricky case
	268	// The thread was preempted or ready to run and now it is on the ready queue
	269	// but the cluster is shutting down, so there aren't any processors to run the ready queue
	270	// the solution is to steal the thread from the ready-queue and pretend it was blocked all along
[3e2b9c9]	271
[e873838]	272	ready_schedule_lock();
[ece0e80]	273	// The thread should on the list
[3e2b9c9]	274	/* paranoid */ verify( thrd.link.next != 0p );
	275
	276	// Remove the thread from the ready queue of this cluster
[ece0e80]	277	// The thread should be the last on the list
[3e2b9c9]	278	__attribute__((unused)) bool removed = remove_head( &cltr, &thrd );
	279	/* paranoid */ verify( removed );
	280	thrd.link.next = 0p;
	281	thrd.link.prev = 0p;
	282
	283	// Fixup the thread state
	284	thrd.state = Blocked;
[6a77224]	285	thrd.ticket = TICKET_BLOCKED;
[3e2b9c9]	286	thrd.preempted = __NO_PREEMPTION;
	287
[e873838]	288	ready_schedule_unlock();
[3e2b9c9]	289
	290	// Pretend like the thread was blocked all along
	291	}
	292	// !!! This is not an else if !!!
[ece0e80]	293	// Ok, now the thread is blocked (whether we cheated to get here or not)
[3e2b9c9]	294	if( thrd.state == Blocked ) {
	295	// This is the "easy case"
	296	// The thread is parked and can easily be moved to active cluster
	297	verify( thrd.curr_cluster != active_cluster() \|\| thrd.curr_cluster == mainCluster );
	298	thrd.curr_cluster = active_cluster();
	299
	300	// unpark the fast io_poller
[0d72d45]	301	unpark( &thrd );
[3e2b9c9]	302	}
	303	else {
	304	// The thread is in a weird state
	305	// I don't know what to do here
	306	abort("io_context poller thread is in unexpected state, cannot clean-up correctly\n");
	307	}
[ece0e80]	308
	309	// The weird thread kidnapping stuff is over, restore interrupts.
	310	enable_interrupts( __cfaabi_dbg_ctx );
[3e2b9c9]	311	} else {
[3c80ccc]	312	post( this.thrd.sem );
[3e2b9c9]	313	}
	314
	315	^(this.thrd){};
	316	__cfadbg_print_safe(io_core, "Kernel I/O : Stopped poller thread for io_context %p\n", &this);
	317
	318	__io_destroy( *this.thrd.ring );
	319	__cfadbg_print_safe(io_core, "Kernel I/O : Destroyed ring for io_context %p\n", &this);
	320
	321	free(this.thrd.ring);
	322	}
	323
	324	void ^?{}(io_context & this) {
	325	^(this){ false };
	326	}
	327
[7222630]	328	extern void __disable_interrupts_hard();
	329	extern void __enable_interrupts_hard();
[bb58825]	330
[3e2b9c9]	331	static void __io_create( __io_data & this, const io_context_params & params_in ) {
	332	// Step 1 : call to setup
	333	struct io_uring_params params;
	334	memset(&params, 0, sizeof(params));
	335	if( params_in.poll_submit ) params.flags \|= IORING_SETUP_SQPOLL;
	336	if( params_in.poll_complete ) params.flags \|= IORING_SETUP_IOPOLL;
	337
[4998155]	338	__u32 nentries = params_in.num_entries != 0 ? params_in.num_entries : 256;
[63fe427c]	339	if( !is_pow2(nentries) ) {
	340	abort("ERROR: I/O setup 'num_entries' must be a power of 2\n");
	341	}
	342	if( params_in.poller_submits && params_in.eager_submits ) {
	343	abort("ERROR: I/O setup 'poller_submits' and 'eager_submits' cannot be used together\n");
	344	}
[3e2b9c9]	345
	346	int fd = syscall(__NR_io_uring_setup, nentries, &params );
	347	if(fd < 0) {
	348	abort("KERNEL ERROR: IO_URING SETUP - %s\n", strerror(errno));
	349	}
	350
	351	// Step 2 : mmap result
	352	memset( &this, 0, sizeof(struct __io_data) );
	353	struct __submition_data & sq = this.submit_q;
	354	struct __completion_data & cq = this.completion_q;
	355
	356	// calculate the right ring size
	357	sq.ring_sz = params.sq_off.array + (params.sq_entries * sizeof(unsigned) );
	358	cq.ring_sz = params.cq_off.cqes + (params.cq_entries * sizeof(struct io_uring_cqe));
	359
	360	// Requires features
	361	#if defined(IORING_FEAT_SINGLE_MMAP)
	362	// adjust the size according to the parameters
	363	if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) {
	364	cq.ring_sz = sq.ring_sz = max(cq.ring_sz, sq.ring_sz);
	365	}
	366	#endif
	367
	368	// mmap the Submit Queue into existence
	369	sq.ring_ptr = mmap(0, sq.ring_sz, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_SQ_RING);
	370	if (sq.ring_ptr == (void*)MAP_FAILED) {
	371	abort("KERNEL ERROR: IO_URING MMAP1 - %s\n", strerror(errno));
	372	}
	373
	374	// Requires features
	375	#if defined(IORING_FEAT_SINGLE_MMAP)
	376	// mmap the Completion Queue into existence (may or may not be needed)
	377	if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) {
	378	cq.ring_ptr = sq.ring_ptr;
	379	}
	380	else
	381	#endif
	382	{
	383	// We need multiple call to MMAP
	384	cq.ring_ptr = mmap(0, cq.ring_sz, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_CQ_RING);
	385	if (cq.ring_ptr == (void*)MAP_FAILED) {
	386	munmap(sq.ring_ptr, sq.ring_sz);
	387	abort("KERNEL ERROR: IO_URING MMAP2 - %s\n", strerror(errno));
	388	}
	389	}
	390
	391	// mmap the submit queue entries
	392	size_t size = params.sq_entries * sizeof(struct io_uring_sqe);
	393	sq.sqes = (struct io_uring_sqe *)mmap(0, size, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_SQES);
	394	if (sq.sqes == (struct io_uring_sqe *)MAP_FAILED) {
	395	munmap(sq.ring_ptr, sq.ring_sz);
	396	if (cq.ring_ptr != sq.ring_ptr) munmap(cq.ring_ptr, cq.ring_sz);
	397	abort("KERNEL ERROR: IO_URING MMAP3 - %s\n", strerror(errno));
	398	}
	399
[426f60c]	400	// Step 3 : Initialize the data structure
[3e2b9c9]	401	// Get the pointers from the kernel to fill the structure
	402	// submit queue
[4998155]	403	sq.head = (volatile __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.head);
	404	sq.tail = (volatile __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.tail);
	405	sq.mask = ( const __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_mask);
	406	sq.num = ( const __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_entries);
	407	sq.flags = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.flags);
	408	sq.dropped = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.dropped);
	409	sq.array = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.array);
[3e2b9c9]	410	sq.prev_head = *sq.head;
	411
	412	{
[4998155]	413	const __u32 num = *sq.num;
[3e2b9c9]	414	for( i; num ) {
[ec19b21]	415	__sqe_clean( &sq.sqes[i] );
[3e2b9c9]	416	}
	417	}
	418
[2fafe7e]	419	(sq.submit_lock){};
[3e2b9c9]	420	(sq.release_lock){};
	421
	422	if( params_in.poller_submits \|\| params_in.eager_submits ) {
	423	/* paranoid */ verify( is_pow2( params_in.num_ready ) \|\| (params_in.num_ready < 8) );
	424	sq.ready_cnt = max( params_in.num_ready, 8 );
[ceb7db8]	425	sq.ready = alloc( sq.ready_cnt, 64`align );
[3e2b9c9]	426	for(i; sq.ready_cnt) {
	427	sq.ready[i] = -1ul32;
	428	}
[1095ccd]	429	sq.prev_ready = 0;
[3e2b9c9]	430	}
	431	else {
	432	sq.ready_cnt = 0;
	433	sq.ready = 0p;
[1095ccd]	434	sq.prev_ready = 0;
[3e2b9c9]	435	}
	436
	437	// completion queue
[4998155]	438	cq.head = (volatile __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.head);
	439	cq.tail = (volatile __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.tail);
	440	cq.mask = ( const __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_mask);
	441	cq.num = ( const __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_entries);
	442	cq.overflow = ( __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.overflow);
	443	cq.cqes = (struct io_uring_cqe *)(((intptr_t)cq.ring_ptr) + params.cq_off.cqes);
[3e2b9c9]	444
[426f60c]	445	// Step 4 : eventfd
[bb58825]	446	// io_uring_register is so f*cking slow on some machine that it
	447	// will never succeed if preemption isn't hard blocked
[7222630]	448	__disable_interrupts_hard();
[bb58825]	449
	450	int efd = eventfd(0, 0);
	451	if (efd < 0) {
	452	abort("KERNEL ERROR: IO_URING EVENTFD - %s\n", strerror(errno));
[426f60c]	453	}
	454
[bb58825]	455	int ret = syscall( __NR_io_uring_register, fd, IORING_REGISTER_EVENTFD, &efd, 1);
	456	if (ret < 0) {
	457	abort("KERNEL ERROR: IO_URING EVENTFD REGISTER - %s\n", strerror(errno));
[426f60c]	458	}
	459
[7222630]	460	__enable_interrupts_hard();
[bb58825]	461
[3e2b9c9]	462	// some paranoid checks
	463	/* 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 );
	464	/* paranoid / verifyf( (cq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *cq.num );
	465	/* paranoid / verifyf( (cq.head) == 0, "IO_URING Expected head to be 0, got %u", *cq.head );
	466	/* paranoid / verifyf( (cq.tail) == 0, "IO_URING Expected tail to be 0, got %u", *cq.tail );
	467
	468	/* 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 );
	469	/* paranoid / verifyf( (sq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *sq.num );
	470	/* paranoid / verifyf( (sq.head) == 0, "IO_URING Expected head to be 0, got %u", *sq.head );
	471	/* paranoid / verifyf( (sq.tail) == 0, "IO_URING Expected tail to be 0, got %u", *sq.tail );
	472
	473	// Update the global ring info
	474	this.ring_flags = params.flags;
	475	this.fd = fd;
[426f60c]	476	this.efd = efd;
[3e2b9c9]	477	this.eager_submits = params_in.eager_submits;
	478	this.poller_submits = params_in.poller_submits;
	479	}
	480
	481	static void __io_destroy( __io_data & this ) {
	482	// Shutdown the io rings
	483	struct __submition_data & sq = this.submit_q;
	484	struct __completion_data & cq = this.completion_q;
	485
	486	// unmap the submit queue entries
	487	munmap(sq.sqes, (sq.num) sizeof(struct io_uring_sqe));
	488
	489	// unmap the Submit Queue ring
	490	munmap(sq.ring_ptr, sq.ring_sz);
	491
	492	// unmap the Completion Queue ring, if it is different
	493	if (cq.ring_ptr != sq.ring_ptr) {
	494	munmap(cq.ring_ptr, cq.ring_sz);
	495	}
	496
	497	// close the file descriptor
	498	close(this.fd);
[426f60c]	499	close(this.efd);
[3e2b9c9]	500
	501	free( this.submit_q.ready ); // Maybe null, doesn't matter
	502	}
	503
	504	//=============================================================================================
	505	// I/O Context Sleep
	506	//=============================================================================================
[d48b174]	507	static inline void __ioctx_epoll_ctl($io_ctx_thread & ctx, int op, const char * error) {
	508	struct epoll_event ev;
[d611995]	509	ev.events = EPOLLIN \| EPOLLONESHOT;
[4998155]	510	ev.data.u64 = (__u64)&ctx;
[d48b174]	511	int ret = epoll_ctl(iopoll.epollfd, op, ctx.ring->efd, &ev);
[3e2b9c9]	512	if (ret < 0) {
[d48b174]	513	abort( "KERNEL ERROR: EPOLL %s - (%d) %s\n", error, (int)errno, strerror(errno) );
[3e2b9c9]	514	}
	515	}
	516
[d48b174]	517	void __ioctx_register($io_ctx_thread & ctx) {
	518	__ioctx_epoll_ctl(ctx, EPOLL_CTL_ADD, "ADD");
	519	}
	520
	521	void __ioctx_prepare_block($io_ctx_thread & ctx) {
[426f60c]	522	__cfadbg_print_safe(io_core, "Kernel I/O - epoll : Re-arming io poller %d (%p)\n", ctx.ring->fd, &ctx);
[d48b174]	523	__ioctx_epoll_ctl(ctx, EPOLL_CTL_MOD, "REARM");
[3e2b9c9]	524	}
	525
[d611995]	526	void __ioctx_unregister($io_ctx_thread & ctx) {
	527	// Read the current epoch so we know when to stop
	528	size_t curr = __atomic_load_n(&iopoll.epoch, __ATOMIC_SEQ_CST);
	529
	530	// Remove the fd from the iopoller
	531	__ioctx_epoll_ctl(ctx, EPOLL_CTL_DEL, "REMOVE");
	532
	533	// Notify the io poller thread of the shutdown
	534	iopoll.run = false;
	535	sigval val = { 1 };
	536	pthread_sigqueue( iopoll.thrd, SIGUSR1, val );
	537
	538	// Make sure all this is done
	539	__atomic_thread_fence(__ATOMIC_SEQ_CST);
	540
	541	// Wait for the next epoch
[4fc3343]	542	while(curr == iopoll.epoch && !iopoll.stopped) Pause();
[d611995]	543	}
	544
[3e2b9c9]	545	//=============================================================================================
	546	// I/O Context Misc Setup
	547	//=============================================================================================
	548	void register_fixed_files( io_context & ctx, int * files, unsigned count ) {
	549	int ret = syscall( __NR_io_uring_register, ctx.thrd.ring->fd, IORING_REGISTER_FILES, files, count );
	550	if( ret < 0 ) {
	551	abort( "KERNEL ERROR: IO_URING SYSCALL - (%d) %s\n", (int)errno, strerror(errno) );
	552	}
	553
	554	__cfadbg_print_safe( io_core, "Kernel I/O : Performed io_register for %p, returned %d\n", active_thread(), ret );
	555	}
	556
	557	void register_fixed_files( cluster & cltr, int * files, unsigned count ) {
	558	for(i; cltr.io.cnt) {
	559	register_fixed_files( cltr.io.ctxs[i], files, count );
	560	}
	561	}
[c44d652]	562	#endif

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