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io.cfa@ 766ec62

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ADT arm-eh ast-experimental enum forall-pointer-decay jacob/cs343-translation new-ast new-ast-unique-expr pthread-emulation qualifiedEnum

Last change on this file since 766ec62 was 9a7c88f, checked in by Thierry Delisle <tdelisle@…>, 5 years ago
Removed unconditionnal print in I/O
Property mode set to `100644`
File size: 21.6 KB

Line
1	#include "kernel.hfa"
2
3	#if !defined(HAVE_LINUX_IO_URING_H)
4	void __kernel_io_startup( cluster & this ) {
5	// Nothing to do without io_uring
6	}
7
8	void __kernel_io_shutdown( cluster & this ) {
9	// Nothing to do without io_uring
10	}
11
12	bool is_async( void (*)() ) {
13	return false;
14	}
15
16	#else
17	extern "C" {
18	#define _GNU_SOURCE /* See feature_test_macros(7) */
19	#include <errno.h>
20	#include <stdint.h>
21	#include <string.h>
22	#include <unistd.h>
23	#include <sys/mman.h>
24	#include <sys/syscall.h>
25
26	#include <linux/io_uring.h>
27	}
28
29	#include "bits/signal.hfa"
30	#include "kernel_private.hfa"
31	#include "thread.hfa"
32
33	uint32_t entries_per_cluster() {
34	return 256;
35	}
36
37	static void * __io_poller( void * arg );
38
39	//=============================================================================================
40	// I/O Startup / Shutdown logic
41	//=============================================================================================
42	void __kernel_io_startup( cluster & this ) {
43	// Step 1 : call to setup
44	struct io_uring_params params;
45	memset(&params, 0, sizeof(params));
46
47	uint32_t nentries = entries_per_cluster();
48
49	int fd = syscall(__NR_io_uring_setup, nentries, &params );
50	if(fd < 0) {
51	abort("KERNEL ERROR: IO_URING SETUP - %s\n", strerror(errno));
52	}
53
54	// Step 2 : mmap result
55	memset(&this.io, 0, sizeof(struct io_ring));
56	struct io_uring_sq & sq = this.io.submit_q;
57	struct io_uring_cq & cq = this.io.completion_q;
58
59	// calculate the right ring size
60	sq.ring_sz = params.sq_off.array + (params.sq_entries * sizeof(unsigned) );
61	cq.ring_sz = params.cq_off.cqes + (params.cq_entries * sizeof(struct io_uring_cqe));
62
63	// Requires features
64	// // adjust the size according to the parameters
65	// if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) {
66	// cq->ring_sz = sq->ring_sz = max(cq->ring_sz, sq->ring_sz);
67	// }
68
69	// mmap the Submit Queue into existence
70	sq.ring_ptr = mmap(0, sq.ring_sz, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_SQ_RING);
71	if (sq.ring_ptr == (void*)MAP_FAILED) {
72	abort("KERNEL ERROR: IO_URING MMAP1 - %s\n", strerror(errno));
73	}
74
75	// mmap the Completion Queue into existence (may or may not be needed)
76	// Requires features
77	// if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) {
78	// cq->ring_ptr = sq->ring_ptr;
79	// }
80	// else {
81	// We need multiple call to MMAP
82	cq.ring_ptr = mmap(0, cq.ring_sz, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_CQ_RING);
83	if (cq.ring_ptr == (void*)MAP_FAILED) {
84	munmap(sq.ring_ptr, sq.ring_sz);
85	abort("KERNEL ERROR: IO_URING MMAP2 - %s\n", strerror(errno));
86	}
87	// }
88
89	// mmap the submit queue entries
90	size_t size = params.sq_entries * sizeof(struct io_uring_sqe);
91	sq.sqes = (struct io_uring_sqe *)mmap(0, size, PROT_READ \| PROT_WRITE, MAP_SHARED \| MAP_POPULATE, fd, IORING_OFF_SQES);
92	if (sq.sqes == (struct io_uring_sqe *)MAP_FAILED) {
93	munmap(sq.ring_ptr, sq.ring_sz);
94	if (cq.ring_ptr != sq.ring_ptr) munmap(cq.ring_ptr, cq.ring_sz);
95	abort("KERNEL ERROR: IO_URING MMAP3 - %s\n", strerror(errno));
96	}
97
98	// Get the pointers from the kernel to fill the structure
99	// submit queue
100	sq.head = (volatile uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.head);
101	sq.tail = (volatile uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.tail);
102	sq.mask = ( const uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_mask);
103	sq.num = ( const uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_entries);
104	sq.flags = ( uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.flags);
105	sq.dropped = ( uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.dropped);
106	sq.array = ( uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.array);
107	sq.alloc = *sq.tail;
108
109	// completion queue
110	cq.head = (volatile uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.head);
111	cq.tail = (volatile uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.tail);
112	cq.mask = ( const uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_mask);
113	cq.num = ( const uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_entries);
114	cq.overflow = ( uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.overflow);
115	cq.cqes = (struct io_uring_cqe *)(((intptr_t)cq.ring_ptr) + params.cq_off.cqes);
116
117	// some paranoid checks
118	/* 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 );
119	/* paranoid / verifyf( (cq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *cq.num );
120	/* paranoid / verifyf( (cq.head) == 0, "IO_URING Expected head to be 0, got %u", *cq.head );
121	/* paranoid / verifyf( (cq.tail) == 0, "IO_URING Expected tail to be 0, got %u", *cq.tail );
122
123	/* 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 );
124	/* paranoid / verifyf( (sq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *sq.num );
125	/* paranoid / verifyf( (sq.head) == 0, "IO_URING Expected head to be 0, got %u", *sq.head );
126	/* paranoid / verifyf( (sq.tail) == 0, "IO_URING Expected tail to be 0, got %u", *sq.tail );
127
128	// Update the global ring info
129	this.io.flags = params.flags;
130	this.io.fd = fd;
131	this.io.done = false;
132	(this.io.submit){ min(sq.num, cq.num) };
133
134	// Create the poller thread
135	this.io.stack = __create_pthread( &this.io.poller, __io_poller, &this );
136	}
137
138	void __kernel_io_shutdown( cluster & this ) {
139	// Stop the IO Poller
140	// Notify the poller thread of the shutdown
141	__atomic_store_n(&this.io.done, true, __ATOMIC_SEQ_CST);
142	sigval val = { 1 };
143	pthread_sigqueue( this.io.poller, SIGUSR1, val );
144
145	// Wait for the poller thread to finish
146	pthread_join( this.io.poller, 0p );
147	free( this.io.stack );
148
149	// Shutdown the io rings
150	struct io_uring_sq & sq = this.io.submit_q;
151	struct io_uring_cq & cq = this.io.completion_q;
152
153	// unmap the submit queue entries
154	munmap(sq.sqes, (sq.num) sizeof(struct io_uring_sqe));
155
156	// unmap the Submit Queue ring
157	munmap(sq.ring_ptr, sq.ring_sz);
158
159	// unmap the Completion Queue ring, if it is different
160	if (cq.ring_ptr != sq.ring_ptr) {
161	munmap(cq.ring_ptr, cq.ring_sz);
162	}
163
164	// close the file descriptor
165	close(this.io.fd);
166	}
167
168	//=============================================================================================
169	// I/O Polling
170	//=============================================================================================
171	struct io_user_data {
172	int32_t result;
173	$thread * thrd;
174	};
175
176	// Process a single completion message from the io_uring
177	// This is NOT thread-safe
178	static bool __io_process(struct io_ring & ring) {
179	unsigned head = *ring.completion_q.head;
180	unsigned tail = __atomic_load_n(ring.completion_q.tail, __ATOMIC_ACQUIRE);
181
182	if (head == tail) return false;
183
184	unsigned idx = head & (*ring.completion_q.mask);
185	struct io_uring_cqe & cqe = ring.completion_q.cqes[idx];
186
187	/* paranoid */ verify(&cqe);
188
189	struct io_user_data * data = (struct io_user_data *)cqe.user_data;
190	__cfaabi_bits_print_safe( STDERR_FILENO, "Performed reading io cqe %p, result %d for %p\n", data, cqe.res, data->thrd );
191
192	data->result = cqe.res;
193	__unpark( data->thrd __cfaabi_dbg_ctx2 );
194
195	// Allow new submissions to happen
196	V(ring.submit);
197
198	// Mark to the kernel that the cqe has been seen
199	// Ensure that the kernel only sees the new value of the head index after the CQEs have been read.
200	__atomic_fetch_add( ring.completion_q.head, 1, __ATOMIC_RELAXED );
201
202	return true;
203	}
204
205	static void * __io_poller( void * arg ) {
206	cluster * cltr = (cluster *)arg;
207	struct io_ring & ring = cltr->io;
208
209	sigset_t mask;
210	sigfillset(&mask);
211	if ( pthread_sigmask( SIG_BLOCK, &mask, 0p ) == -1 ) {
212	abort( "KERNEL ERROR: IO_URING - pthread_sigmask" );
213	}
214
215	sigdelset( &mask, SIGUSR1 );
216
217	verify( (ring.submit_q.head) == (ring.submit_q.tail) );
218	verify( (ring.completion_q.head) == (ring.completion_q.tail) );
219
220	LOOP: while(!__atomic_load_n(&ring.done, __ATOMIC_SEQ_CST)) {
221	int ret = syscall( __NR_io_uring_enter, ring.fd, 0, 1, IORING_ENTER_GETEVENTS, &mask, _NSIG / 8);
222	if( ret < 0 ) {
223	switch((int)errno) {
224	case EAGAIN:
225	case EINTR:
226	continue LOOP;
227	default:
228	abort( "KERNEL ERROR: IO_URING WAIT - %s\n", strerror(errno) );
229	}
230	}
231
232	// Drain the queue
233	while(__io_process(ring)) {}
234	}
235
236	return 0p;
237	}
238
239	//=============================================================================================
240	// I/O Submissions
241	//=============================================================================================
242
243	// Submition steps :
244	// 1 - We need to make sure we don't overflow any of the buffer, P(ring.submit) to make sure
245	// entries are available. The semaphore make sure that there is no more operations in
246	// progress then the number of entries in the buffer. This probably limits concurrency
247	// more than necessary since submitted but not completed operations don't need any
248	// entries in user space. However, I don't know what happens if we overflow the buffers
249	// because too many requests completed at once. This is a safe approach in all cases.
250	// Furthermore, with hundreds of entries, this may be okay.
251	//
252	// 2 - Allocate a queue entry. The ring already has memory for all entries but only the ones
253	// listed in sq.array are visible by the kernel. For those not listed, the kernel does not
254	// offer any assurance that an entry is not being filled by multiple flags. Therefore, we
255	// need to write an allocator that allows allocating concurrently.
256	//
257	// 3 - Actually fill the submit entry, this is the only simple and straightforward step.
258	//
259	// 4 - Append the entry index to the array and adjust the tail accordingly. This operation
260	// needs to arrive to two concensus at the same time:
261	// A - The order in which entries are listed in the array: no two threads must pick the
262	// same index for their entries
263	// B - When can the tail be update for the kernel. EVERY entries in the array between
264	// head and tail must be fully filled and shouldn't ever be touched again.
265	//
266
267	static inline [* struct io_uring_sqe, uint32_t] __submit_alloc( struct io_ring & ring ) {
268	// Wait for a spot to be available
269	P(ring.submit);
270
271	// Allocate the sqe
272	uint32_t idx = __atomic_fetch_add(&ring.submit_q.alloc, 1ul32, __ATOMIC_SEQ_CST);
273
274	// Validate that we didn't overflow anything
275	// Check that nothing overflowed
276	/* paranoid */ verify( true );
277
278	// Check that it goes head -> tail -> alloc and never head -> alloc -> tail
279	/* paranoid */ verify( true );
280
281	// Return the sqe
282	return [&ring.submit_q.sqes[ idx & (*ring.submit_q.mask)], idx];
283	}
284
285	static inline void __submit( struct io_ring & ring, uint32_t idx ) {
286	// get mutual exclusion
287	lock(ring.submit_q.lock __cfaabi_dbg_ctx2);
288
289	// Append to the list of ready entries
290	uint32_t * tail = ring.submit_q.tail;
291	const uint32_t mask = *ring.submit_q.mask;
292
293	ring.submit_q.array[ (*tail) & mask ] = idx & mask;
294	__atomic_fetch_add(tail, 1ul32, __ATOMIC_SEQ_CST);
295
296	// Submit however, many entries need to be submitted
297	int ret = syscall( __NR_io_uring_enter, ring.fd, 1, 0, 0, 0p, 0);
298	__cfaabi_bits_print_safe( STDERR_FILENO, "Performed io_submit, returned %d\n", ret );
299	if( ret < 0 ) {
300	switch((int)errno) {
301	default:
302	abort( "KERNEL ERROR: IO_URING SUBMIT - %s\n", strerror(errno) );
303	}
304	}
305
306	unlock(ring.submit_q.lock);
307	// Make sure that idx was submitted
308	// Be careful to not get false positive if we cycled the entire list or that someone else submitted for us
309	}
310
311	static inline void ?{}(struct io_uring_sqe & this, uint8_t opcode, int fd) {
312	this.opcode = opcode;
313	#if !defined(IOSQE_ASYNC)
314	this.flags = 0;
315	#else
316	this.flags = IOSQE_ASYNC;
317	#endif
318	this.ioprio = 0;
319	this.fd = fd;
320	this.off = 0;
321	this.addr = 0;
322	this.len = 0;
323	this.rw_flags = 0;
324	this.__pad2[0] = this.__pad2[1] = this.__pad2[2] = 0;
325	}
326
327	static inline void ?{}(struct io_uring_sqe & this, uint8_t opcode, int fd, void * addr, uint32_t len, uint64_t off ) {
328	(this){ opcode, fd };
329	this.off = off;
330	this.addr = (uint64_t)addr;
331	this.len = len;
332	}
333
334	//=============================================================================================
335	// I/O Interface
336	//=============================================================================================
337	extern "C" {
338	#define __USE_GNU
339	#define _GNU_SOURCE
340	#include <fcntl.h>
341	#include <sys/uio.h>
342	#include <sys/socket.h>
343	#include <sys/stat.h>
344	}
345
346	#define __submit_prelude \
347	struct io_ring & ring = active_cluster()->io; \
348	struct io_uring_sqe * sqe; \
349	uint32_t idx; \
350	[sqe, idx] = __submit_alloc( ring );
351
352	#define __submit_wait \
353	io_user_data data = { 0, active_thread() }; \
354	__cfaabi_bits_print_safe( STDERR_FILENO, "Preparing user data %p for %p\n", &data, data.thrd ); \
355	sqe->user_data = (uint64_t)&data; \
356	__submit( ring, idx ); \
357	park( __cfaabi_dbg_ctx ); \
358	return data.result;
359
360	//-----------------------------------------------------------------------------
361	// Asynchronous operations
362	ssize_t async_preadv2(int fd, const struct iovec *iov, int iovcnt, off_t offset, int flags) {
363	#if !defined(IORING_OP_READV)
364	return preadv2(fd, iov, iovcnt, offset, flags);
365	#else
366	__submit_prelude
367
368	(*sqe){ IORING_OP_READV, fd, iov, iovcnt, offset };
369
370	__submit_wait
371	#endif
372	}
373
374	ssize_t async_pwritev2(int fd, const struct iovec *iov, int iovcnt, off_t offset, int flags) {
375	#if !defined(IORING_OP_WRITEV)
376	return pwritev2(fd, iov, iovcnt, offset, flags);
377	#else
378	__submit_prelude
379
380	(*sqe){ IORING_OP_WRITEV, fd, iov, iovcnt, offset };
381
382	__submit_wait
383	#endif
384	}
385
386	int async_fsync(int fd) {
387	#if !defined(IORING_OP_FSYNC)
388	return fsync(fd);
389	#else
390	__submit_prelude
391
392	(*sqe){ IORING_OP_FSYNC, fd };
393
394	__submit_wait
395	#endif
396	}
397
398	int async_sync_file_range(int fd, int64_t offset, int64_t nbytes, unsigned int flags) {
399	#if !defined(IORING_OP_SYNC_FILE_RANGE)
400	return sync_file_range(fd, offset, nbytes, flags);
401	#else
402	__submit_prelude
403
404	(*sqe){ IORING_OP_SYNC_FILE_RANGE, fd };
405	sqe->off = offset;
406	sqe->len = nbytes;
407	sqe->sync_range_flags = flags;
408
409	__submit_wait
410	#endif
411	}
412
413
414	ssize_t async_sendmsg(int sockfd, const struct msghdr *msg, int flags) {
415	#if !defined(IORING_OP_SENDMSG)
416	return recv(sockfd, msg, flags);
417	#else
418	__submit_prelude
419
420	(*sqe){ IORING_OP_SENDMSG, sockfd, msg, 1, 0 };
421	sqe->msg_flags = flags;
422
423	__submit_wait
424	#endif
425	}
426
427	ssize_t async_recvmsg(int sockfd, struct msghdr *msg, int flags) {
428	#if !defined(IORING_OP_RECVMSG)
429	return recv(sockfd, msg, flags);
430	#else
431	__submit_prelude
432
433	(*sqe){ IORING_OP_RECVMSG, sockfd, msg, 1, 0 };
434	sqe->msg_flags = flags;
435
436	__submit_wait
437	#endif
438	}
439
440	ssize_t async_send(int sockfd, const void *buf, size_t len, int flags) {
441	#if !defined(IORING_OP_SEND)
442	return send( sockfd, buf, len, flags );
443	#else
444	__submit_prelude
445
446	(*sqe){ IORING_OP_SEND, sockfd };
447	sqe->addr = (uint64_t)buf;
448	sqe->len = len;
449	sqe->msg_flags = flags;
450
451	__submit_wait
452	#endif
453	}
454
455	ssize_t async_recv(int sockfd, void *buf, size_t len, int flags) {
456	#if !defined(IORING_OP_RECV)
457	return recv( sockfd, buf, len, flags );
458	#else
459	__submit_prelude
460
461	(*sqe){ IORING_OP_RECV, sockfd };
462	sqe->addr = (uint64_t)buf;
463	sqe->len = len;
464	sqe->msg_flags = flags;
465
466	__submit_wait
467	#endif
468	}
469
470	int async_accept4(int sockfd, struct sockaddr addr, socklen_t addrlen, int flags) {
471	#if !defined(IORING_OP_ACCEPT)
472	__SOCKADDR_ARG _addr;
473	_addr.__sockaddr__ = addr;
474	return accept4( sockfd, _addr, addrlen, flags );
475	#else
476	__submit_prelude
477
478	(*sqe){ IORING_OP_ACCEPT, sockfd };
479	sqe->addr = addr;
480	sqe->addr2 = addrlen;
481	sqe->accept_flags = flags;
482
483	__submit_wait
484	#endif
485	}
486
487	int async_connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen) {
488	#if !defined(IORING_OP_CONNECT)
489	__CONST_SOCKADDR_ARG _addr;
490	_addr.__sockaddr__ = addr;
491	return connect( sockfd, _addr, addrlen );
492	#else
493	__submit_prelude
494
495	(*sqe){ IORING_OP_CONNECT, sockfd };
496	sqe->addr = (uint64_t)addr;
497	sqe->off = addrlen;
498
499	__submit_wait
500	#endif
501	}
502
503	int async_fallocate(int fd, int mode, uint64_t offset, uint64_t len) {
504	#if !defined(IORING_OP_FALLOCATE)
505	return fallocate( fd, mode, offset, len );
506	#else
507	__submit_prelude
508
509	(*sqe){ IORING_OP_FALLOCATE, fd };
510	sqe->off = offset;
511	sqe->len = length;
512	sqe->mode = mode;
513
514	__submit_wait
515	#endif
516	}
517
518	int async_fadvise(int fd, uint64_t offset, uint64_t len, int advice) {
519	#if !defined(IORING_OP_FADVISE)
520	return posix_fadvise( fd, offset, len, advice );
521	#else
522	__submit_prelude
523
524	(*sqe){ IORING_OP_FADVISE, fd };
525	sqe->off = (uint64_t)offset;
526	sqe->len = length;
527	sqe->fadvise_advice = advice;
528
529	__submit_wait
530	#endif
531	}
532
533	int async_madvise(void *addr, size_t length, int advice) {
534	#if !defined(IORING_OP_MADVISE)
535	return madvise( addr, length, advice );
536	#else
537	__submit_prelude
538
539	(*sqe){ IORING_OP_MADVISE, 0 };
540	sqe->addr = (uint64_t)addr;
541	sqe->len = length;
542	sqe->fadvise_advice = advice;
543
544	__submit_wait
545	#endif
546	}
547
548	int async_openat(int dirfd, const char *pathname, int flags, mode_t mode) {
549	#if !defined(IORING_OP_OPENAT)
550	return openat( dirfd, pathname, flags, mode );
551	#else
552	__submit_prelude
553
554	(*sqe){ IORING_OP_OPENAT, dirfd };
555	sqe->addr = (uint64_t)pathname;
556	sqe->open_flags = flags;
557	sqe->mode = mode;
558
559	__submit_wait
560	#endif
561	}
562
563	int async_close(int fd) {
564	#if !defined(IORING_OP_CLOSE)
565	return close( fd );
566	#else
567	__submit_prelude
568
569	(*sqe){ IORING_OP_CLOSE, fd };
570
571	__submit_wait
572	#endif
573	}
574
575	int async_statx(int dirfd, const char pathname, int flags, unsigned int mask, struct statx statxbuf) {
576	#if !defined(IORING_OP_STATX)
577	return statx( dirfd, pathname, flags, mask, statxbuf );
578	#else
579	__submit_prelude
580
581	(*sqe){ IORING_OP_STATX, dirfd };
582	sqe->addr = (uint64_t)pathname;
583	sqe->statx_flags = flags;
584	sqe->len = mask;
585	sqe->off = (uint64_t)statxbuf;
586
587	__submit_wait
588	#endif
589	}
590
591
592	ssize_t async_read(int fd, void *buf, size_t count) {
593	#if !defined(IORING_OP_READ)
594	return read( fd, buf, count );
595	#else
596	__submit_prelude
597
598	(*sqe){ IORING_OP_READ, fd, buf, count, 0 };
599
600	__submit_wait
601	#endif
602	}
603
604	ssize_t async_write(int fd, void *buf, size_t count) {
605	#if !defined(IORING_OP_WRITE)
606	return read( fd, buf, count );
607	#else
608	__submit_prelude
609
610	(*sqe){ IORING_OP_WRITE, fd, buf, count, 0 };
611
612	__submit_wait
613	#endif
614	}
615
616	//-----------------------------------------------------------------------------
617	// Check if a function is asynchronous
618
619	// Macro magic to reduce the size of the following switch case
620	#define IS_DEFINED_APPLY(f, ...) f(__VA_ARGS__)
621	#define IS_DEFINED_SECOND(first, second, ...) second
622	#define IS_DEFINED_TEST(expansion) _CFA_IO_FEATURE_##expansion
623	#define IS_DEFINED(macro) IS_DEFINED_APPLY( IS_DEFINED_SECOND,IS_DEFINED_TEST(macro) false, true)
624
625	bool is_async( fptr_t func ) {
626
627	if( /func == (fptr_t)preadv2 \|\| /
628	func == (fptr_t)async_preadv2 )
629	#define _CFA_IO_FEATURE_IORING_OP_READV ,
630	return IS_DEFINED(IORING_OP_READV);
631
632	if( /func == (fptr_t)pwritev2 \|\| /
633	func == (fptr_t)async_pwritev2 )
634	#define _CFA_IO_FEATURE_IORING_OP_WRITEV ,
635	return IS_DEFINED(IORING_OP_WRITEV);
636
637	if( /func == (fptr_t)fsync \|\| /
638	func == (fptr_t)async_fsync )
639	#define _CFA_IO_FEATURE_IORING_OP_FSYNC ,
640	return IS_DEFINED(IORING_OP_FSYNC);
641
642	if( /func == (fptr_t)ync_file_range \|\| /
643	func == (fptr_t)async_sync_file_range )
644	#define _CFA_IO_FEATURE_IORING_OP_SYNC_FILE_RANGE ,
645	return IS_DEFINED(IORING_OP_SYNC_FILE_RANGE);
646
647	if( /func == (fptr_t)sendmsg \|\| /
648	func == (fptr_t)async_sendmsg )
649	#define _CFA_IO_FEATURE_IORING_OP_SENDMSG ,
650	return IS_DEFINED(IORING_OP_SENDMSG);
651
652	if( /func == (fptr_t)recvmsg \|\| /
653	func == (fptr_t)async_recvmsg )
654	#define _CFA_IO_FEATURE_IORING_OP_RECVMSG ,
655	return IS_DEFINED(IORING_OP_RECVMSG);
656
657	if( /func == (fptr_t)send \|\| /
658	func == (fptr_t)async_send )
659	#define _CFA_IO_FEATURE_IORING_OP_SEND ,
660	return IS_DEFINED(IORING_OP_SEND);
661
662	if( /func == (fptr_t)recv \|\| /
663	func == (fptr_t)async_recv )
664	#define _CFA_IO_FEATURE_IORING_OP_RECV ,
665	return IS_DEFINED(IORING_OP_RECV);
666
667	if( /func == (fptr_t)accept4 \|\| /
668	func == (fptr_t)async_accept4 )
669	#define _CFA_IO_FEATURE_IORING_OP_ACCEPT ,
670	return IS_DEFINED(IORING_OP_ACCEPT);
671
672	if( /func == (fptr_t)connect \|\| /
673	func == (fptr_t)async_connect )
674	#define _CFA_IO_FEATURE_IORING_OP_CONNECT ,
675	return IS_DEFINED(IORING_OP_CONNECT);
676
677	if( /func == (fptr_t)fallocate \|\| /
678	func == (fptr_t)async_fallocate )
679	#define _CFA_IO_FEATURE_IORING_OP_FALLOCATE ,
680	return IS_DEFINED(IORING_OP_FALLOCATE);
681
682	if( /func == (fptr_t)fadvise \|\| /
683	func == (fptr_t)async_fadvise )
684	#define _CFA_IO_FEATURE_IORING_OP_FADVISE ,
685	return IS_DEFINED(IORING_OP_FADVISE);
686
687	if( /func == (fptr_t)madvise \|\| /
688	func == (fptr_t)async_madvise )
689	#define _CFA_IO_FEATURE_IORING_OP_MADVISE ,
690	return IS_DEFINED(IORING_OP_MADVISE);
691
692	if( /func == (fptr_t)openat \|\| /
693	func == (fptr_t)async_openat )
694	#define _CFA_IO_FEATURE_IORING_OP_OPENAT ,
695	return IS_DEFINED(IORING_OP_OPENAT);
696
697	if( /func == (fptr_t)close \|\| /
698	func == (fptr_t)async_close )
699	#define _CFA_IO_FEATURE_IORING_OP_CLOSE ,
700	return IS_DEFINED(IORING_OP_CLOSE);
701
702	if( /func == (fptr_t)statx \|\| /
703	func == (fptr_t)async_statx )
704	#define _CFA_IO_FEATURE_IORING_OP_STATX ,
705	return IS_DEFINED(IORING_OP_STATX);
706
707	if( /func == (fptr_t)read \|\| /
708	func == (fptr_t)async_read )
709	#define _CFA_IO_FEATURE_IORING_OP_READ ,
710	return IS_DEFINED(IORING_OP_READ);
711
712	if( /func == (fptr_t)write \|\| /
713	func == (fptr_t)async_write )
714	#define _CFA_IO_FEATURE_IORING_OP_WRITE ,
715	return IS_DEFINED(IORING_OP_WRITE);
716
717	return false;
718	}
719
720	#endif

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