source: libcfa/src/concurrency/clib/cfathread.cfa@ e23b3ce

ADT ast-experimental
Last change on this file since e23b3ce was a0a949c, checked in by Peter A. Buhr <pabuhr@…>, 3 years ago

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