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setup.cfa @ 58f99b3

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

Last change on this file since 58f99b3 was 58f99b3, checked in by Thierry Delisle <tdelisle@…>, 3 years ago
Retry interruptable syscalls instead of blocking interrupts
Property mode set to `100644`
File size: 17.8 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
	44	#else
	45	#include <errno.h>
	46	#include <stdint.h>
	47	#include <string.h>
	48	#include <signal.h>
	49	#include <unistd.h>
	50
	51	extern "C" {
	52	#include <pthread.h>
	53	#include <sys/epoll.h>
[426f60c]	54	#include <sys/eventfd.h>
[3e2b9c9]	55	#include <sys/mman.h>
	56	#include <sys/syscall.h>
	57
	58	#include <linux/io_uring.h>
	59	}
	60
	61	#include "bitmanip.hfa"
	62	#include "kernel_private.hfa"
	63	#include "thread.hfa"
	64
	65	void ?{}(io_context_params & this) {
	66	this.num_entries = 256;
	67	this.num_ready = 256;
	68	this.submit_aff = -1;
	69	this.eager_submits = false;
	70	this.poller_submits = false;
	71	this.poll_submit = false;
	72	this.poll_complete = false;
	73	}
	74
	75	static void * __io_poller_slow( void * arg );
	76
	77	// Weirdly, some systems that do support io_uring don't actually define these
	78	#ifdef __alpha__
	79	/*
	80	* alpha is the only exception, all other architectures
	81	* have common numbers for new system calls.
	82	*/
	83	#ifndef __NR_io_uring_setup
	84	#define __NR_io_uring_setup 535
	85	#endif
	86	#ifndef __NR_io_uring_enter
	87	#define __NR_io_uring_enter 536
	88	#endif
	89	#ifndef __NR_io_uring_register
	90	#define __NR_io_uring_register 537
	91	#endif
	92	#else /* !__alpha__ */
	93	#ifndef __NR_io_uring_setup
	94	#define __NR_io_uring_setup 425
	95	#endif
	96	#ifndef __NR_io_uring_enter
	97	#define __NR_io_uring_enter 426
	98	#endif
	99	#ifndef __NR_io_uring_register
	100	#define __NR_io_uring_register 427
	101	#endif
	102	#endif
	103
	104	//=============================================================================================
	105	// I/O Startup / Shutdown logic + Master Poller
	106	//=============================================================================================
	107
	108	// IO Master poller loop forward
	109	static void * iopoll_loop( __attribute__((unused)) void * args );
	110
	111	static struct {
	112	pthread_t thrd; // pthread handle to io poller thread
	113	void * stack; // pthread stack for io poller thread
	114	int epollfd; // file descriptor to the epoll instance
	115	volatile bool run; // Whether or not to continue
	116	} iopoll;
	117
	118	void __kernel_io_startup(void) {
[80444bb]	119	__cfadbg_print_safe(io_core, "Kernel : Creating EPOLL instance\n" );
[3e2b9c9]	120
	121	iopoll.epollfd = epoll_create1(0);
	122	if (iopoll.epollfd == -1) {
	123	abort( "internal error, epoll_create1\n");
	124	}
	125
[80444bb]	126	__cfadbg_print_safe(io_core, "Kernel : Starting io poller thread\n" );
[3e2b9c9]	127
	128	iopoll.run = true;
	129	iopoll.stack = __create_pthread( &iopoll.thrd, iopoll_loop, 0p );
	130	}
	131
	132	void __kernel_io_shutdown(void) {
	133	// Notify the io poller thread of the shutdown
	134	iopoll.run = false;
	135	sigval val = { 1 };
	136	pthread_sigqueue( iopoll.thrd, SIGUSR1, val );
	137
	138	// Wait for the io poller thread to finish
	139
[bfcf6b9]	140	__destroy_pthread( iopoll.thrd, iopoll.stack, 0p );
[3e2b9c9]	141
	142	int ret = close(iopoll.epollfd);
	143	if (ret == -1) {
	144	abort( "internal error, close epoll\n");
	145	}
	146
	147	// Io polling is now fully stopped
	148
[80444bb]	149	__cfadbg_print_safe(io_core, "Kernel : IO poller stopped\n" );
[3e2b9c9]	150	}
	151
	152	static void * iopoll_loop( __attribute__((unused)) void * args ) {
	153	__processor_id_t id;
[58d64a4]	154	id.full_proc = false;
[3e2b9c9]	155	id.id = doregister(&id);
[8fc652e0]	156	__cfaabi_tls.this_proc_id = &id;
[80444bb]	157	__cfadbg_print_safe(io_core, "Kernel : IO poller thread starting\n" );
[3e2b9c9]	158
	159	// Block signals to control when they arrive
	160	sigset_t mask;
	161	sigfillset(&mask);
	162	if ( pthread_sigmask( SIG_BLOCK, &mask, 0p ) == -1 ) {
	163	abort( "internal error, pthread_sigmask" );
	164	}
	165
	166	sigdelset( &mask, SIGUSR1 );
	167
	168	// Create sufficient events
	169	struct epoll_event events[10];
	170	// Main loop
	171	while( iopoll.run ) {
[ece0e80]	172	__cfadbg_print_safe(io_core, "Kernel I/O - epoll : waiting on io_uring contexts\n");
	173
[3e2b9c9]	174	// Wait for events
	175	int nfds = epoll_pwait( iopoll.epollfd, events, 10, -1, &mask );
	176
[ece0e80]	177	__cfadbg_print_safe(io_core, "Kernel I/O - epoll : %d io contexts events, waking up\n", nfds);
	178
[3e2b9c9]	179	// Check if an error occured
	180	if (nfds == -1) {
	181	if( errno == EINTR ) continue;
	182	abort( "internal error, pthread_sigmask" );
	183	}
	184
	185	for(i; nfds) {
	186	$io_ctx_thread * io_ctx = ($io_ctx_thread *)(uintptr_t)events[i].data.u64;
	187	/* paranoid */ verify( io_ctx );
[426f60c]	188	__cfadbg_print_safe(io_core, "Kernel I/O - epoll : Unparking io poller %d (%p)\n", io_ctx->ring->fd, io_ctx);
[3e2b9c9]	189	#if !defined( __CFA_NO_STATISTICS__ )
[8fc652e0]	190	__cfaabi_tls.this_stats = io_ctx->self.curr_cluster->stats;
[3e2b9c9]	191	#endif
[e873838]	192	post( io_ctx->sem );
[3e2b9c9]	193	}
	194	}
	195
[80444bb]	196	__cfadbg_print_safe(io_core, "Kernel : IO poller thread stopping\n" );
[3e2b9c9]	197	unregister(&id);
	198	return 0p;
	199	}
	200
	201	//=============================================================================================
	202	// I/O Context Constrution/Destruction
	203	//=============================================================================================
	204
	205	void ?{}($io_ctx_thread & this, struct cluster & cl) { (this.self){ "IO Poller", cl }; }
	206	void main( $io_ctx_thread & this );
	207	static inline $thread * get_thread( $io_ctx_thread & this ) { return &this.self; }
	208	void ^?{}( $io_ctx_thread & mutex this ) {}
	209
	210	static void __io_create ( __io_data & this, const io_context_params & params_in );
	211	static void __io_destroy( __io_data & this );
	212
	213	void ?{}(io_context & this, struct cluster & cl, const io_context_params & params) {
	214	(this.thrd){ cl };
	215	this.thrd.ring = malloc();
	216	__cfadbg_print_safe(io_core, "Kernel I/O : Creating ring for io_context %p\n", &this);
	217	__io_create( *this.thrd.ring, params );
	218
	219	__cfadbg_print_safe(io_core, "Kernel I/O : Starting poller thread for io_context %p\n", &this);
	220	this.thrd.done = false;
	221	__thrd_start( this.thrd, main );
	222
	223	__cfadbg_print_safe(io_core, "Kernel I/O : io_context %p ready\n", &this);
	224	}
	225
	226	void ?{}(io_context & this, struct cluster & cl) {
	227	io_context_params params;
	228	(this){ cl, params };
	229	}
	230
	231	void ^?{}(io_context & this, bool cluster_context) {
	232	__cfadbg_print_safe(io_core, "Kernel I/O : tearing down io_context %p\n", &this);
	233
	234	// Notify the thread of the shutdown
	235	__atomic_store_n(&this.thrd.done, true, __ATOMIC_SEQ_CST);
	236
	237	// If this is an io_context within a cluster, things get trickier
	238	$thread & thrd = this.thrd.self;
	239	if( cluster_context ) {
[ece0e80]	240	// We are about to do weird things with the threads
	241	// we don't need interrupts to complicate everything
	242	disable_interrupts();
	243
	244	// Get cluster info
[3e2b9c9]	245	cluster & cltr = *thrd.curr_cluster;
[1eb239e4]	246	/* paranoid */ verify( cltr.idles.total == 0 \|\| &cltr == mainCluster );
[3e2b9c9]	247	/* paranoid */ verify( !ready_mutate_islocked() );
	248
	249	// We need to adjust the clean-up based on where the thread is
	250	if( thrd.state == Ready \|\| thrd.preempted != __NO_PREEMPTION ) {
[ece0e80]	251	// This is the tricky case
	252	// The thread was preempted or ready to run and now it is on the ready queue
	253	// but the cluster is shutting down, so there aren't any processors to run the ready queue
	254	// the solution is to steal the thread from the ready-queue and pretend it was blocked all along
[3e2b9c9]	255
[e873838]	256	ready_schedule_lock();
[ece0e80]	257	// The thread should on the list
[3e2b9c9]	258	/* paranoid */ verify( thrd.link.next != 0p );
	259
	260	// Remove the thread from the ready queue of this cluster
[ece0e80]	261	// The thread should be the last on the list
[3e2b9c9]	262	__attribute__((unused)) bool removed = remove_head( &cltr, &thrd );
	263	/* paranoid */ verify( removed );
	264	thrd.link.next = 0p;
	265	thrd.link.prev = 0p;
	266
	267	// Fixup the thread state
	268	thrd.state = Blocked;
[6a77224]	269	thrd.ticket = TICKET_BLOCKED;
[3e2b9c9]	270	thrd.preempted = __NO_PREEMPTION;
	271
[e873838]	272	ready_schedule_unlock();
[3e2b9c9]	273
	274	// Pretend like the thread was blocked all along
	275	}
	276	// !!! This is not an else if !!!
[ece0e80]	277	// Ok, now the thread is blocked (whether we cheated to get here or not)
[3e2b9c9]	278	if( thrd.state == Blocked ) {
	279	// This is the "easy case"
	280	// The thread is parked and can easily be moved to active cluster
	281	verify( thrd.curr_cluster != active_cluster() \|\| thrd.curr_cluster == mainCluster );
	282	thrd.curr_cluster = active_cluster();
	283
	284	// unpark the fast io_poller
[0d72d45]	285	unpark( &thrd );
[3e2b9c9]	286	}
	287	else {
	288	// The thread is in a weird state
	289	// I don't know what to do here
	290	abort("io_context poller thread is in unexpected state, cannot clean-up correctly\n");
	291	}
[ece0e80]	292
	293	// The weird thread kidnapping stuff is over, restore interrupts.
	294	enable_interrupts( __cfaabi_dbg_ctx );
[3e2b9c9]	295	} else {
[3c80ccc]	296	post( this.thrd.sem );
[3e2b9c9]	297	}
	298
	299	^(this.thrd){};
	300	__cfadbg_print_safe(io_core, "Kernel I/O : Stopped poller thread for io_context %p\n", &this);
	301
	302	__io_destroy( *this.thrd.ring );
	303	__cfadbg_print_safe(io_core, "Kernel I/O : Destroyed ring for io_context %p\n", &this);
	304
	305	free(this.thrd.ring);
	306	}
	307
	308	void ^?{}(io_context & this) {
	309	^(this){ false };
	310	}
	311
	312	static void __io_create( __io_data & this, const io_context_params & params_in ) {
	313	// Step 1 : call to setup
	314	struct io_uring_params params;
	315	memset(&params, 0, sizeof(params));
	316	if( params_in.poll_submit ) params.flags \|= IORING_SETUP_SQPOLL;
	317	if( params_in.poll_complete ) params.flags \|= IORING_SETUP_IOPOLL;
	318
[4998155]	319	__u32 nentries = params_in.num_entries != 0 ? params_in.num_entries : 256;
[63fe427c]	320	if( !is_pow2(nentries) ) {
	321	abort("ERROR: I/O setup 'num_entries' must be a power of 2\n");
	322	}
	323	if( params_in.poller_submits && params_in.eager_submits ) {
	324	abort("ERROR: I/O setup 'poller_submits' and 'eager_submits' cannot be used together\n");
	325	}
[3e2b9c9]	326
	327	int fd = syscall(__NR_io_uring_setup, nentries, &params );
	328	if(fd < 0) {
	329	abort("KERNEL ERROR: IO_URING SETUP - %s\n", strerror(errno));
	330	}
	331
	332	// Step 2 : mmap result
	333	memset( &this, 0, sizeof(struct __io_data) );
	334	struct __submition_data & sq = this.submit_q;
	335	struct __completion_data & cq = this.completion_q;
	336
	337	// calculate the right ring size
	338	sq.ring_sz = params.sq_off.array + (params.sq_entries * sizeof(unsigned) );
	339	cq.ring_sz = params.cq_off.cqes + (params.cq_entries * sizeof(struct io_uring_cqe));
	340
	341	// Requires features
	342	#if defined(IORING_FEAT_SINGLE_MMAP)
	343	// adjust the size according to the parameters
	344	if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) {
	345	cq.ring_sz = sq.ring_sz = max(cq.ring_sz, sq.ring_sz);
	346	}
	347	#endif
	348
	349	// mmap the Submit Queue into existence
	350	sq.ring_ptr = mmap(0, sq.ring_sz, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_SQ_RING);
	351	if (sq.ring_ptr == (void*)MAP_FAILED) {
	352	abort("KERNEL ERROR: IO_URING MMAP1 - %s\n", strerror(errno));
	353	}
	354
	355	// Requires features
	356	#if defined(IORING_FEAT_SINGLE_MMAP)
	357	// mmap the Completion Queue into existence (may or may not be needed)
	358	if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) {
	359	cq.ring_ptr = sq.ring_ptr;
	360	}
	361	else
	362	#endif
	363	{
	364	// We need multiple call to MMAP
	365	cq.ring_ptr = mmap(0, cq.ring_sz, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_CQ_RING);
	366	if (cq.ring_ptr == (void*)MAP_FAILED) {
	367	munmap(sq.ring_ptr, sq.ring_sz);
	368	abort("KERNEL ERROR: IO_URING MMAP2 - %s\n", strerror(errno));
	369	}
	370	}
	371
	372	// mmap the submit queue entries
	373	size_t size = params.sq_entries * sizeof(struct io_uring_sqe);
	374	sq.sqes = (struct io_uring_sqe *)mmap(0, size, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_SQES);
	375	if (sq.sqes == (struct io_uring_sqe *)MAP_FAILED) {
	376	munmap(sq.ring_ptr, sq.ring_sz);
	377	if (cq.ring_ptr != sq.ring_ptr) munmap(cq.ring_ptr, cq.ring_sz);
	378	abort("KERNEL ERROR: IO_URING MMAP3 - %s\n", strerror(errno));
	379	}
[426f60c]	380	memset(sq.sqes, 0xde, size);
	381
	382	verify( 0 != (params.features & IORING_FEAT_NODROP) );
[3e2b9c9]	383
[426f60c]	384	// Step 3 : Initialize the data structure
[3e2b9c9]	385	// Get the pointers from the kernel to fill the structure
	386	// submit queue
[4998155]	387	sq.head = (volatile __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.head);
	388	sq.tail = (volatile __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.tail);
	389	sq.mask = ( const __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_mask);
	390	sq.num = ( const __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_entries);
	391	sq.flags = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.flags);
	392	sq.dropped = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.dropped);
	393	sq.array = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.array);
[3e2b9c9]	394	sq.prev_head = *sq.head;
	395
	396	{
[4998155]	397	const __u32 num = *sq.num;
[3e2b9c9]	398	for( i; num ) {
[426f60c]	399	sq.sqes[i].opcode = IORING_OP_LAST;
	400	sq.sqes[i].user_data = 3ul64;
[3e2b9c9]	401	}
	402	}
	403
[2fafe7e]	404	(sq.submit_lock){};
[3e2b9c9]	405	(sq.release_lock){};
	406
	407	if( params_in.poller_submits \|\| params_in.eager_submits ) {
	408	/* paranoid */ verify( is_pow2( params_in.num_ready ) \|\| (params_in.num_ready < 8) );
	409	sq.ready_cnt = max( params_in.num_ready, 8 );
[ceb7db8]	410	sq.ready = alloc( sq.ready_cnt, 64`align );
[3e2b9c9]	411	for(i; sq.ready_cnt) {
	412	sq.ready[i] = -1ul32;
	413	}
[1095ccd]	414	sq.prev_ready = 0;
[3e2b9c9]	415	}
	416	else {
	417	sq.ready_cnt = 0;
	418	sq.ready = 0p;
[1095ccd]	419	sq.prev_ready = 0;
[3e2b9c9]	420	}
	421
	422	// completion queue
[4998155]	423	cq.head = (volatile __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.head);
	424	cq.tail = (volatile __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.tail);
	425	cq.mask = ( const __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_mask);
	426	cq.num = ( const __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_entries);
	427	cq.overflow = ( __u32 *)(((intptr_t)cq.ring_ptr) + params.cq_off.overflow);
	428	cq.cqes = (struct io_uring_cqe *)(((intptr_t)cq.ring_ptr) + params.cq_off.cqes);
[3e2b9c9]	429
[426f60c]	430	// Step 4 : eventfd
[58f99b3]	431	int efd;
	432	for() {
	433	efd = eventfd(0, 0);
	434	if (efd < 0) {
	435	if (errno == EINTR) continue;
	436	abort("KERNEL ERROR: IO_URING EVENTFD - %s\n", strerror(errno));
	437	}
	438	break;
[426f60c]	439	}
	440
[58f99b3]	441	int ret;
	442	for() {
	443	ret = syscall( __NR_io_uring_register, fd, IORING_REGISTER_EVENTFD, &efd, 1);
	444	if (ret < 0) {
	445	if (errno == EINTR) continue;
	446	abort("KERNEL ERROR: IO_URING EVENTFD REGISTER - %s\n", strerror(errno));
	447	}
	448	break;
[426f60c]	449	}
	450
[3e2b9c9]	451	// some paranoid checks
	452	/* 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 );
	453	/* paranoid / verifyf( (cq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *cq.num );
	454	/* paranoid / verifyf( (cq.head) == 0, "IO_URING Expected head to be 0, got %u", *cq.head );
	455	/* paranoid / verifyf( (cq.tail) == 0, "IO_URING Expected tail to be 0, got %u", *cq.tail );
	456
	457	/* 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 );
	458	/* paranoid / verifyf( (sq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *sq.num );
	459	/* paranoid / verifyf( (sq.head) == 0, "IO_URING Expected head to be 0, got %u", *sq.head );
	460	/* paranoid / verifyf( (sq.tail) == 0, "IO_URING Expected tail to be 0, got %u", *sq.tail );
	461
	462	// Update the global ring info
	463	this.ring_flags = params.flags;
	464	this.fd = fd;
[426f60c]	465	this.efd = efd;
[3e2b9c9]	466	this.eager_submits = params_in.eager_submits;
	467	this.poller_submits = params_in.poller_submits;
	468	}
	469
	470	static void __io_destroy( __io_data & this ) {
	471	// Shutdown the io rings
	472	struct __submition_data & sq = this.submit_q;
	473	struct __completion_data & cq = this.completion_q;
	474
	475	// unmap the submit queue entries
	476	munmap(sq.sqes, (sq.num) sizeof(struct io_uring_sqe));
	477
	478	// unmap the Submit Queue ring
	479	munmap(sq.ring_ptr, sq.ring_sz);
	480
	481	// unmap the Completion Queue ring, if it is different
	482	if (cq.ring_ptr != sq.ring_ptr) {
	483	munmap(cq.ring_ptr, cq.ring_sz);
	484	}
	485
	486	// close the file descriptor
	487	close(this.fd);
[426f60c]	488	close(this.efd);
[3e2b9c9]	489
	490	free( this.submit_q.ready ); // Maybe null, doesn't matter
	491	}
	492
	493	//=============================================================================================
	494	// I/O Context Sleep
	495	//=============================================================================================
	496
	497	void __ioctx_register($io_ctx_thread & ctx, struct epoll_event & ev) {
[426f60c]	498	ev.events = EPOLLIN \| EPOLLET \| EPOLLONESHOT;
[4998155]	499	ev.data.u64 = (__u64)&ctx;
[426f60c]	500	int ret = epoll_ctl(iopoll.epollfd, EPOLL_CTL_ADD, ctx.ring->efd, &ev);
[3e2b9c9]	501	if (ret < 0) {
	502	abort( "KERNEL ERROR: EPOLL ADD - (%d) %s\n", (int)errno, strerror(errno) );
	503	}
	504	}
	505
	506	void __ioctx_prepare_block($io_ctx_thread & ctx, struct epoll_event & ev) {
[426f60c]	507	__cfadbg_print_safe(io_core, "Kernel I/O - epoll : Re-arming io poller %d (%p)\n", ctx.ring->fd, &ctx);
	508	int ret = epoll_ctl(iopoll.epollfd, EPOLL_CTL_MOD, ctx.ring->efd, &ev);
[3e2b9c9]	509	if (ret < 0) {
	510	abort( "KERNEL ERROR: EPOLL REARM - (%d) %s\n", (int)errno, strerror(errno) );
	511	}
	512	}
	513
	514	//=============================================================================================
	515	// I/O Context Misc Setup
	516	//=============================================================================================
	517	void register_fixed_files( io_context & ctx, int * files, unsigned count ) {
	518	int ret = syscall( __NR_io_uring_register, ctx.thrd.ring->fd, IORING_REGISTER_FILES, files, count );
	519	if( ret < 0 ) {
	520	abort( "KERNEL ERROR: IO_URING SYSCALL - (%d) %s\n", (int)errno, strerror(errno) );
	521	}
	522
	523	__cfadbg_print_safe( io_core, "Kernel I/O : Performed io_register for %p, returned %d\n", active_thread(), ret );
	524	}
	525
	526	void register_fixed_files( cluster & cltr, int * files, unsigned count ) {
	527	for(i; cltr.io.cnt) {
	528	register_fixed_files( cltr.io.ctxs[i], files, count );
	529	}
	530	}
[c44d652]	531	#endif

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