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cfathread.cfa @ 858350a

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Last change on this file since 858350a was 2d028003, checked in by Peter A. Buhr <pabuhr@…>, 20 months ago
restructure #include files because issues with attribute transparent_union are resolved
Property mode set to `100644`
File size: 16.2 KB

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1	//
2	// Cforall Version 1.0.0 Copyright (C) 2016 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	// clib/cfathread.cfa --
8	//
9	// Author : Thierry Delisle
10	// Created On : Tue Sep 22 15:31:20 2020
11	// Last Modified By :
12	// Last Modified On :
13	// Update Count :
14	//
15
16	// #define EPOLL_FOR_SOCKETS
17
18	#include <string.h>
19	#include <errno.h>
20	#include <unistd.h>
21	#include <sys/socket.h>
22
23	#include "fstream.hfa"
24	#include "locks.hfa"
25	#include "kernel.hfa"
26	#include "stats.hfa"
27	#include "thread.hfa"
28	#include "time.hfa"
29	#include "stdlib.hfa"
30	#include "iofwd.hfa"
31	#include "cfathread.h"
32
33	extern void ?{}(processor &, const char[], cluster &, thread$ *);
34	extern "C" {
35	extern void __cfactx_invoke_thread(void (main)(void ), void * this);
36	}
37
38	extern Time __kernel_get_time();
39	extern unsigned register_proc_id( void );
40
41	//================================================================================
42	// Epoll support for sockets
43
44	#if defined(EPOLL_FOR_SOCKETS)
45	extern "C" {
46	#include <sys/epoll.h>
47	#include <sys/resource.h>
48	}
49
50	static pthread_t master_poller;
51	static int master_epollfd = 0;
52	static size_t poller_cnt = 0;
53	static int * poller_fds = 0p;
54	static struct leaf_poller * pollers = 0p;
55
56	struct __attribute__((aligned)) fd_info_t {
57	int pollid;
58	size_t rearms;
59	};
60	rlim_t fd_limit = 0;
61	static fd_info_t * volatile * fd_map = 0p;
62
63	void * master_epoll( __attribute__((unused)) void * args ) {
64	unsigned id = register_proc_id();
65
66	enum { MAX_EVENTS = 5 };
67	struct epoll_event events[MAX_EVENTS];
68	for() {
69	int ret = epoll_wait(master_epollfd, events, MAX_EVENTS, -1);
70	if ( ret < 0 ) {
71	abort \| "Master epoll error: " \| strerror(errno);
72	}
73
74	for(i; ret) {
75	thread$ * thrd = (thread$ *)events[i].data.u64;
76	unpark( thrd );
77	}
78	}
79
80	return 0p;
81	}
82
83	static inline int epoll_rearm(int epollfd, int fd, uint32_t event) {
84	struct epoll_event eevent;
85	eevent.events = event \| EPOLLET \| EPOLLONESHOT;
86	eevent.data.u64 = (uint64_t)active_thread();
87
88	if(0 != epoll_ctl(epollfd, EPOLL_CTL_MOD, fd, &eevent))
89	{
90	if(errno == ENOENT) return -1;
91	abort \| acquire \| "epoll" \| epollfd \| "ctl rearm" \| fd \| "error: " \| errno \| strerror(errno);
92	}
93
94	park();
95	return 0;
96	}
97
98	thread leaf_poller {
99	int epollfd;
100	};
101
102	void ?{}(leaf_poller & this, int fd) { this.epollfd = fd; }
103
104	void main(leaf_poller & this) {
105	enum { MAX_EVENTS = 1024 };
106	struct epoll_event events[MAX_EVENTS];
107	const int max_retries = 5;
108	int retries = max_retries;
109
110	struct epoll_event event;
111	event.events = EPOLLIN \| EPOLLET \| EPOLLONESHOT;
112	event.data.u64 = (uint64_t)&(thread&)this;
113
114	if(0 != epoll_ctl(master_epollfd, EPOLL_CTL_ADD, this.epollfd, &event))
115	{
116	abort \| "master epoll ctl add leaf: " \| errno \| strerror(errno);
117	}
118
119	park();
120
121	for() {
122	yield();
123	int ret = epoll_wait(this.epollfd, events, MAX_EVENTS, 0);
124	if ( ret < 0 ) {
125	abort \| "Leaf epoll error: " \| errno \| strerror(errno);
126	}
127
128	if(ret) {
129	for(i; ret) {
130	thread$ * thrd = (thread$ *)events[i].data.u64;
131	unpark( thrd, UNPARK_REMOTE );
132	}
133	}
134	else if(0 >= --retries) {
135	epoll_rearm(master_epollfd, this.epollfd, EPOLLIN);
136	}
137	}
138	}
139
140	void setup_epoll( void ) __attribute__(( constructor ));
141	void setup_epoll( void ) {
142	if(master_epollfd) abort \| "Master epoll already setup";
143
144	master_epollfd = epoll_create1(0);
145	if(master_epollfd == -1) {
146	abort \| "failed to create master epoll: " \| errno \| strerror(errno);
147	}
148
149	struct rlimit rlim;
150	if(int ret = getrlimit(RLIMIT_NOFILE, &rlim); 0 != ret) {
151	abort \| "failed to get nofile limit: " \| errno \| strerror(errno);
152	}
153
154	fd_limit = rlim.rlim_cur;
155	fd_map = alloc(fd_limit);
156	for(i;fd_limit) {
157	fd_map[i] = 0p;
158	}
159
160	poller_cnt = 2;
161	poller_fds = alloc(poller_cnt);
162	pollers = alloc(poller_cnt);
163	for(i; poller_cnt) {
164	poller_fds[i] = epoll_create1(0);
165	if(poller_fds[i] == -1) {
166	abort \| "failed to create leaf epoll [" \| i \| "]: " \| errno \| strerror(errno);
167	}
168
169	(pollers[i]){ poller_fds[i] };
170	}
171
172	pthread_attr_t attr;
173	if (int ret = __cfaabi_pthread_attr_init(&attr); 0 != ret) {
174	abort \| "failed to create master epoll thread attr: " \| ret \| strerror(ret);
175	}
176
177	if (int ret = __cfaabi_pthread_create(&master_poller, &attr, master_epoll, 0p); 0 != ret) {
178	abort \| "failed to create master epoll thread: " \| ret \| strerror(ret);
179	}
180	}
181
182	static inline int epoll_wait(int fd, uint32_t event) {
183	if(fd_map[fd] >= 1p) {
184	fd_map[fd]->rearms++;
185	epoll_rearm(poller_fds[fd_map[fd]->pollid], fd, event);
186	return 0;
187	}
188
189	for() {
190	fd_info_t * expected = 0p;
191	fd_info_t * sentinel = 1p;
192	if(__atomic_compare_exchange_n( &(fd_map[fd]), &expected, sentinel, true, __ATOMIC_SEQ_CST, __ATOMIC_RELAXED)) {
193	struct epoll_event eevent;
194	eevent.events = event \| EPOLLET \| EPOLLONESHOT;
195	eevent.data.u64 = (uint64_t)active_thread();
196
197	int id = prng() % poller_cnt;
198	if(0 != epoll_ctl(poller_fds[id], EPOLL_CTL_ADD, fd, &eevent))
199	{
200	abort \| "epoll ctl add" \| poller_fds[id] \| fd \| fd_map[fd] \| expected \| "error: " \| errno \| strerror(errno);
201	}
202
203	fd_info_t * ninfo = alloc();
204	ninfo->pollid = id;
205	ninfo->rearms = 0;
206	__atomic_store_n( &fd_map[fd], ninfo, __ATOMIC_SEQ_CST);
207
208	park();
209	return 0;
210	}
211
212	if(expected >= 0) {
213	fd_map[fd]->rearms++;
214	epoll_rearm(poller_fds[fd_map[fd]->pollid], fd, event);
215	return 0;
216	}
217
218	Pause();
219	}
220	}
221	#endif
222
223	//================================================================================
224	// Thread run by the C Interface
225
226	struct cfathread_object {
227	thread$ self;
228	void * (themain)( void );
229	void * arg;
230	void * ret;
231	};
232	void main(cfathread_object & this);
233	void ^?{}(cfathread_object & mutex this);
234
235	static inline thread$ * get_thread( cfathread_object & this ) { return &this.self; }
236
237	typedef ThreadCancelled(cfathread_object) cfathread_exception;
238	typedef vtable(ThreadCancelled(cfathread_object)) cfathread_vtable;
239
240	void defaultResumptionHandler(ThreadCancelled(cfathread_object) & except) {
241	abort \| "A thread was cancelled";
242	}
243
244	cfathread_vtable _cfathread_vtable_instance;
245
246	cfathread_vtable & const _default_vtable = _cfathread_vtable_instance;
247
248	cfathread_vtable const & get_exception_vtable(cfathread_exception *) {
249	return _cfathread_vtable_instance;
250	}
251
252	static void ?{}( cfathread_object & this, cluster & cl, void (themain)( void * ), void * arg ) {
253	this.themain = themain;
254	this.arg = arg;
255	(this.self){"C-thread", cl};
256	__thrd_start(this, main);
257	}
258
259	void ^?{}(cfathread_object & mutex this) {
260	^(this.self){};
261	}
262
263	void main( cfathread_object & this ) {
264	__attribute__((unused)) void * const thrd_obj = (void*)&this;
265	__attribute__((unused)) void * const thrd_hdl = (void*)active_thread();
266	/* paranoid */ verify( thrd_obj == thrd_hdl );
267
268	this.ret = this.themain( this.arg );
269	}
270
271	//================================================================================
272	// Special Init Thread responsible for the initialization or processors
273	struct __cfainit {
274	thread$ self;
275	void (init)( void );
276	void * arg;
277	};
278	void main(__cfainit & this);
279	void ^?{}(__cfainit & mutex this);
280
281	static inline thread$ * get_thread( __cfainit & this ) { return &this.self; }
282
283	typedef ThreadCancelled(__cfainit) __cfainit_exception;
284	typedef vtable(ThreadCancelled(__cfainit)) __cfainit_vtable;
285
286	void defaultResumptionHandler(ThreadCancelled(__cfainit) & except) {
287	abort \| "The init thread was cancelled";
288	}
289
290	__cfainit_vtable ___cfainit_vtable_instance;
291
292	__cfainit_vtable const & get_exception_vtable(__cfainit_exception *) {
293	return ___cfainit_vtable_instance;
294	}
295
296	static void ?{}( __cfainit & this, void (init)( void ), void * arg ) {
297	this.init = init;
298	this.arg = arg;
299	(this.self){"Processir Init"};
300
301	// Don't use __thrd_start! just prep the context manually
302	thread$ * this_thrd = get_thread(this);
303	void (*main_p)(__cfainit &) = main;
304
305	disable_interrupts();
306	__cfactx_start(main_p, get_coroutine(this), this, __cfactx_invoke_thread);
307
308	this_thrd->context.[SP, FP] = this_thrd->self_cor.context.[SP, FP];
309	/* paranoid */ verify( this_thrd->context.SP );
310
311	this_thrd->state = Ready;
312	enable_interrupts();
313	}
314
315	void ^?{}(__cfainit & mutex this) {
316	^(this.self){};
317	}
318
319	void main( __cfainit & this ) {
320	__attribute__((unused)) void * const thrd_obj = (void*)&this;
321	__attribute__((unused)) void * const thrd_hdl = (void*)active_thread();
322	/* paranoid */ verify( thrd_obj == thrd_hdl );
323
324	this.init( this.arg );
325	}
326
327	#pragma GCC visibility push(default)
328
329	//================================================================================
330	// Main Api
331	extern "C" {
332	int cfathread_cluster_create(cfathread_cluster_t * cl) __attribute__((nonnull(1))) libcfa_public {
333	*cl = new();
334	return 0;
335	}
336
337	cfathread_cluster_t cfathread_cluster_self(void) libcfa_public {
338	return active_cluster();
339	}
340
341	int cfathread_cluster_print_stats( cfathread_cluster_t cl ) libcfa_public {
342	#if !defined(__CFA_NO_STATISTICS__)
343	print_stats_at_exit( *cl, CFA_STATS_READY_Q \| CFA_STATS_IO );
344	print_stats_now( *cl, CFA_STATS_READY_Q \| CFA_STATS_IO );
345	#endif
346	return 0;
347	}
348
349	int cfathread_cluster_add_worker(cfathread_cluster_t cl, pthread_t* tid, void (init_routine) (void ), void * arg) {
350	__cfainit * it = 0p;
351	if(init_routine) {
352	it = alloc();
353	(*it){init_routine, arg};
354	}
355	processor * proc = alloc();
356	(proc){ "C-processor", cl, get_thread(*it) };
357
358	// Wait for the init thread to return before continuing
359	if(it) {
360	^(*it){};
361	free(it);
362	}
363
364	if(tid) *tid = proc->kernel_thread;
365	return 0;
366	}
367
368	int cfathread_cluster_pause (cfathread_cluster_t) {
369	abort \| "Pausing clusters is not supported";
370	exit(1);
371	}
372
373	int cfathread_cluster_resume(cfathread_cluster_t) {
374	abort \| "Resuming clusters is not supported";
375	exit(1);
376	}
377
378	//--------------------
379	// Thread attributes
380	int cfathread_attr_init(cfathread_attr_t *attr) __attribute__((nonnull (1))) {
381	attr->cl = active_cluster();
382	return 0;
383	}
384
385	//--------------------
386	// Thread
387	int cfathread_create( cfathread_t * handle, const cfathread_attr_t * attr, void (main)( void * ), void * arg ) __attribute__((nonnull (1))) {
388	cluster * cl = attr ? attr->cl : active_cluster();
389	cfathread_t thrd = alloc();
390	(thrd){ cl, main, arg };
391	*handle = thrd;
392	return 0;
393	}
394
395	int cfathread_join( cfathread_t thrd, void ** retval ) {
396	void * ret = join( *thrd ).ret;
397	^( *thrd ){};
398	free(thrd);
399	if(retval) {
400	*retval = ret;
401	}
402	return 0;
403	}
404
405	int cfathread_get_errno(void) {
406	return errno;
407	}
408
409	cfathread_t cfathread_self(void) {
410	return (cfathread_t)active_thread();
411	}
412
413	int cfathread_usleep(useconds_t usecs) {
414	sleep(usecs`us);
415	return 0;
416	}
417
418	int cfathread_sleep(unsigned int secs) {
419	sleep(secs`s);
420	return 0;
421	}
422
423	void cfathread_park( void ) {
424	park();
425	}
426
427	void cfathread_unpark( cfathread_t thrd ) {
428	unpark( *thrd );
429	}
430
431	void cfathread_yield( void ) {
432	yield();
433	}
434
435	typedef struct cfathread_mutex * cfathread_mutex_t;
436
437	//--------------------
438	// Mutex
439	struct cfathread_mutex {
440	exp_backoff_then_block_lock impl;
441	};
442	int cfathread_mutex_init(cfathread_mutex_t restrict mut, const cfathread_mutexattr_t restrict) __attribute__((nonnull (1))) { *mut = new(); return 0; }
443	int cfathread_mutex_destroy(cfathread_mutex_t mut) __attribute__((nonnull (1))) { delete( mut ); return 0; }
444	int cfathread_mutex_lock (cfathread_mutex_t mut) __attribute__((nonnull (1))) { lock( (mut)->impl ); return 0; }
445	int cfathread_mutex_unlock (cfathread_mutex_t mut) __attribute__((nonnull (1))) { unlock( (mut)->impl ); return 0; }
446	int cfathread_mutex_trylock(cfathread_mutex_t *mut) __attribute__((nonnull (1))) {
447	bool ret = try_lock( (*mut)->impl );
448	if( ret ) return 0;
449	else return EBUSY;
450	}
451
452	//--------------------
453	// Condition
454	struct cfathread_condition {
455	condition_variable(exp_backoff_then_block_lock) impl;
456	};
457	int cfathread_cond_init(cfathread_cond_t restrict cond, const cfathread_condattr_t restrict) __attribute__((nonnull (1))) { *cond = new(); return 0; }
458	int cfathread_cond_signal(cfathread_cond_t cond) __attribute__((nonnull (1))) { notify_one( (cond)->impl ); return 0; }
459	int cfathread_cond_wait(cfathread_cond_t restrict cond, cfathread_mutex_t restrict mut) __attribute__((nonnull (1,2))) { wait( (cond)->impl, (mut)->impl ); return 0; }
460	int cfathread_cond_timedwait(cfathread_cond_t restrict cond, cfathread_mutex_t restrict mut, const struct timespec *restrict abstime) __attribute__((nonnull (1,2,3))) {
461	Time t = { *abstime };
462	timespec curr;
463	clock_gettime( CLOCK_REALTIME, &curr );
464	Time c = { curr };
465	if( wait( (cond)->impl, (mut)->impl, t - c ) ) {
466	return 0;
467	}
468	errno = ETIMEDOUT;
469	return ETIMEDOUT;
470	}
471	}
472
473	extern "C" {
474	//--------------------
475	// IO operations
476	int cfathread_socket(int domain, int type, int protocol) {
477	return socket(domain, type
478	#if defined(EPOLL_FOR_SOCKETS)
479	\| SOCK_NONBLOCK
480	#endif
481	, protocol);
482	}
483	int cfathread_bind(int socket, __CONST_SOCKADDR_ARG address, socklen_t address_len) {
484	return bind(socket, address, address_len);
485	}
486
487	int cfathread_listen(int socket, int backlog) {
488	return listen(socket, backlog);
489	}
490
491	int cfathread_accept(int socket, __SOCKADDR_ARG address, socklen_t *restrict address_len) {
492	#if defined(EPOLL_FOR_SOCKETS)
493	int ret;
494	for() {
495	yield();
496	ret = accept4(socket, address, address_len, SOCK_NONBLOCK);
497	if(ret >= 0) break;
498	if(errno != EAGAIN && errno != EWOULDBLOCK) break;
499
500	epoll_wait(socket, EPOLLIN);
501	}
502	return ret;
503	#else
504	return cfa_accept4(socket, address, address_len, 0, CFA_IO_LAZY);
505	#endif
506	}
507
508	int cfathread_connect(int socket, __CONST_SOCKADDR_ARG address, socklen_t address_len) {
509	#if defined(EPOLL_FOR_SOCKETS)
510	int ret;
511	for() {
512	ret = connect(socket, address, address_len);
513	if(ret >= 0) break;
514	if(errno != EAGAIN && errno != EWOULDBLOCK) break;
515
516	epoll_wait(socket, EPOLLIN);
517	}
518	return ret;
519	#else
520	return cfa_connect(socket, address, address_len, CFA_IO_LAZY);
521	#endif
522	}
523
524	int cfathread_dup(int fildes) {
525	return dup(fildes);
526	}
527
528	int cfathread_close(int fildes) {
529	return cfa_close(fildes, CFA_IO_LAZY);
530	}
531
532	ssize_t cfathread_sendmsg(int socket, const struct msghdr *message, int flags) {
533	#if defined(EPOLL_FOR_SOCKETS)
534	ssize_t ret;
535	__STATS__( false, io.ops.sockwrite++; )
536	for() {
537	ret = sendmsg(socket, message, flags);
538	if(ret >= 0) break;
539	if(errno != EAGAIN && errno != EWOULDBLOCK) break;
540
541	__STATS__( false, io.ops.epllwrite++; )
542	epoll_wait(socket, EPOLLOUT);
543	}
544	#else
545	ssize_t ret = cfa_sendmsg(socket, message, flags, CFA_IO_LAZY);
546	#endif
547	return ret;
548	}
549
550	ssize_t cfathread_write(int fildes, const void *buf, size_t nbyte) {
551	// Use send rather then write for socket since it's faster
552	#if defined(EPOLL_FOR_SOCKETS)
553	ssize_t ret;
554	// __STATS__( false, io.ops.sockwrite++; )
555	for() {
556	ret = send(fildes, buf, nbyte, 0);
557	if(ret >= 0) break;
558	if(errno != EAGAIN && errno != EWOULDBLOCK) break;
559
560	// __STATS__( false, io.ops.epllwrite++; )
561	epoll_wait(fildes, EPOLLOUT);
562	}
563	#else
564	ssize_t ret = cfa_send(fildes, buf, nbyte, 0, CFA_IO_LAZY);
565	#endif
566	return ret;
567	}
568
569	ssize_t cfathread_recvfrom(int socket, void restrict buffer, size_t length, int flags, struct sockaddr restrict address, socklen_t *restrict address_len) {
570	struct iovec iov;
571	iov.iov_base = buffer;
572	iov.iov_len = length;
573
574	struct msghdr msg;
575	msg.msg_name = address;
576	msg.msg_namelen = address_len ? (socklen_t)*address_len : (socklen_t)0;
577	msg.msg_iov = &iov;
578	msg.msg_iovlen = 1;
579	msg.msg_control = 0p;
580	msg.msg_controllen = 0;
581
582	#if defined(EPOLL_FOR_SOCKETS)
583	ssize_t ret;
584	yield();
585	for() {
586	ret = recvmsg(socket, &msg, flags);
587	if(ret >= 0) break;
588	if(errno != EAGAIN && errno != EWOULDBLOCK) break;
589
590	epoll_wait(socket, EPOLLIN);
591	}
592	#else
593	ssize_t ret = cfa_recvmsg(socket, &msg, flags, CFA_IO_LAZY);
594	#endif
595
596	if(address_len) *address_len = msg.msg_namelen;
597	return ret;
598	}
599
600	ssize_t cfathread_read(int fildes, void *buf, size_t nbyte) {
601	// Use recv rather then read for socket since it's faster
602	#if defined(EPOLL_FOR_SOCKETS)
603	ssize_t ret;
604	__STATS__( false, io.ops.sockread++; )
605	yield();
606	for() {
607	ret = recv(fildes, buf, nbyte, 0);
608	if(ret >= 0) break;
609	if(errno != EAGAIN && errno != EWOULDBLOCK) break;
610
611	__STATS__( false, io.ops.epllread++; )
612	epoll_wait(fildes, EPOLLIN);
613	}
614	#else
615	ssize_t ret = cfa_recv(fildes, buf, nbyte, 0, CFA_IO_LAZY);
616	#endif
617	return ret;
618	}
619
620	}

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