source: libcfa/src/concurrency/kernel/startup.cfa@ adb67cf3

Last change on this file since adb67cf3 was ca0c311, checked in by caparsons <caparson@…>, 2 years ago

added ability to get number of processors constructed on a cluster (not necessarily registered yet)
  • Property mode set to 100644
File size: 27.5 KB
Line 
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// kernel/startup.cfa --
8//
9// Author : Thierry Delisle
10// Created On : Thu Jul 30 15:12:54 2020
11// Last Modified By :
12// Last Modified On :
13// Update Count :
14//
15
16#define __cforall_thread__
17
18// #define __CFA_DEBUG_PRINT_RUNTIME_CORE__
19
20// C Includes
21#include <errno.h> // errno
22#include <signal.h>
23#include <string.h> // strerror
24#include <unistd.h>
25#include <limits.h> // PTHREAD_STACK_MIN
26extern "C" {
27 #include <sys/eventfd.h> // eventfd
28 #include <sys/mman.h> // mprotect
29 #include <sys/resource.h> // getrlimit
30}
31
32// CFA Includes
33#include "kernel/private.hfa"
34#include "iofwd.hfa"
35#include "startup.hfa" // STARTUP_PRIORITY_XXX
36#include "limits.hfa"
37#include "math.hfa"
38#include "bits/random.hfa" // prng
39
40#define CFA_PROCESSOR_USE_MMAP 0
41
42//-----------------------------------------------------------------------------
43// Some assembly required
44#if defined( __i386 )
45 #define CtxGet( ctx ) __asm__ volatile ( \
46 "movl %%esp,%0\n" \
47 "movl %%ebp,%1\n" \
48 : "=rm" (ctx.SP), \
49 "=rm" (ctx.FP) \
50 )
51#elif defined( __x86_64 )
52 #define CtxGet( ctx ) __asm__ volatile ( \
53 "movq %%rsp,%0\n" \
54 "movq %%rbp,%1\n" \
55 : "=rm" (ctx.SP), \
56 "=rm" (ctx.FP) \
57 )
58#elif defined( __aarch64__ )
59 #define CtxGet( ctx ) __asm__ volatile ( \
60 "mov %0, sp\n" \
61 "mov %1, fp\n" \
62 : "=rm" (ctx.SP), \
63 "=rm" (ctx.FP) \
64 )
65#else
66 #error unknown hardware architecture
67#endif
68
69//-----------------------------------------------------------------------------
70// Start and stop routine for the kernel, declared first to make sure they run first
71static void __kernel_startup (void) __attribute__(( constructor( STARTUP_PRIORITY_KERNEL ) ));
72static void __kernel_shutdown(void) __attribute__(( destructor ( STARTUP_PRIORITY_KERNEL ) ));
73
74//-----------------------------------------------------------------------------
75// Static Forward Declarations
76struct current_stack_info_t;
77
78static void * __invoke_processor(void * arg);
79static void __kernel_first_resume( processor * this );
80static void __kernel_last_resume ( processor * this );
81static void init(processor & this, const char name[], cluster & _cltr, thread$ * initT);
82static void deinit(processor & this);
83static void doregister( struct cluster & cltr );
84static void unregister( struct cluster & cltr );
85static void register_tls( processor * this );
86static void unregister_tls( processor * this );
87static void ?{}( coroutine$ & this, current_stack_info_t * info);
88static void ?{}( thread$ & this, current_stack_info_t * info);
89static void ?{}(processorCtx_t & this) {}
90static void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info);
91
92#if defined(__CFA_WITH_VERIFY__)
93 static bool verify_fwd_bck_rng(void);
94#endif
95
96//-----------------------------------------------------------------------------
97// Forward Declarations for other modules
98extern void __kernel_alarm_startup(void);
99extern void __kernel_alarm_shutdown(void);
100extern void __cfa_io_start( processor * );
101extern void __cfa_io_stop ( processor * );
102
103//-----------------------------------------------------------------------------
104// Other Forward Declarations
105extern void __wake_proc(processor *);
106extern int cfa_main_returned; // from interpose.cfa
107size_t __global_random_prime = 4_294_967_291u;
108bool __global_random_mask = false;
109
110//-----------------------------------------------------------------------------
111// Kernel storage
112KERNEL_STORAGE(cluster, mainCluster);
113KERNEL_STORAGE(processor, mainProcessor);
114KERNEL_STORAGE(thread$, mainThread);
115KERNEL_STORAGE(__stack_t, mainThreadCtx);
116#if !defined(__CFA_NO_STATISTICS__)
117KERNEL_STORAGE(__stats_t, mainProcStats);
118#endif
119
120cluster * mainCluster libcfa_public;
121processor * mainProcessor;
122thread$ * mainThread;
123
124extern "C" {
125 struct { __dllist_t(cluster) list; __spinlock_t lock; } __cfa_dbg_global_clusters;
126}
127
128extern size_t __page_size;
129extern int __map_prot;
130
131//-----------------------------------------------------------------------------
132// Global state
133__thread struct KernelThreadData __cfaabi_tls __attribute__ ((tls_model ( "initial-exec" ))) @= {
134 .this_thread : NULL, // cannot use 0p
135 .this_processor : NULL,
136 .sched_lock : false,
137 .preemption_state : { .disable_count : 1, .enabled : false, .in_progress : false },
138 // random_state uninitialized
139 .ready_rng : { .fwd_seed : 0, .bck_seed : 0 },
140 .this_stats : NULL,
141 #ifdef __CFA_WITH_VERIFY__
142 .in_sched_lock : false,
143 .sched_id : 0,
144 #endif
145};
146
147__scheduler_RWLock_t __scheduler_lock @= { 0 };
148
149//-----------------------------------------------------------------------------
150// Struct to steal stack
151struct current_stack_info_t {
152 __stack_t * storage; // pointer to stack object
153 void * base; // base of stack
154 void * limit; // stack grows towards stack limit
155 void * context; // address of cfa_context_t
156};
157
158static void ?{}( current_stack_info_t & this ) {
159 __stack_context_t ctx;
160 CtxGet( ctx );
161 this.base = ctx.FP;
162
163 rlimit r;
164 getrlimit( RLIMIT_STACK, &r);
165 size_t size = r.rlim_cur;
166
167 this.limit = (void *)(((intptr_t)this.base) - size);
168 this.context = &storage_mainThreadCtx;
169}
170
171
172extern void heapManagerCtor();
173extern void heapManagerDtor();
174
175//=============================================================================================
176// Kernel Setup logic
177//=============================================================================================
178//-----------------------------------------------------------------------------
179// Kernel boot procedures
180static void __kernel_startup(void) {
181 /* paranoid */ verify( ! __preemption_enabled() );
182 __cfadbg_print_safe(runtime_core, "Kernel : Starting\n");
183
184 __cfa_dbg_global_clusters.list{ __get };
185 __cfa_dbg_global_clusters.lock{};
186
187 /* paranoid */ verify( verify_fwd_bck_rng() );
188
189 // Initialize the global scheduler lock
190 // __scheduler_lock = (__scheduler_RWLock_t*)&storage___scheduler_lock;
191 (__scheduler_lock){};
192
193 // Initialize the main cluster
194 mainCluster = (cluster *)&storage_mainCluster;
195 (*mainCluster){"Main Cluster", 0};
196
197 __cfadbg_print_safe(runtime_core, "Kernel : Main cluster ready\n");
198
199 // Construct the processor context of the main processor
200 void ?{}(processorCtx_t & this, processor * proc) {
201 (this.self){ "Processor" };
202 this.self.starter = 0p;
203 this.proc = proc;
204 }
205
206 void ?{}(processor & this) with( this ) {
207 ( this.terminated ){};
208 ( this.runner ){};
209 init( this, "Main Processor", *mainCluster, 0p );
210 kernel_thread = __cfaabi_pthread_self();
211
212 runner{ &this };
213 __cfadbg_print_safe(runtime_core, "Kernel : constructed main processor context %p\n", &runner);
214 }
215
216 // Initialize the main processor and the main processor ctx
217 // (the coroutine that contains the processing control flow)
218 mainProcessor = (processor *)&storage_mainProcessor;
219 (*mainProcessor){};
220
221 __cfa_io_start( mainProcessor );
222 register_tls( mainProcessor );
223
224 // Start by initializing the main thread
225 // SKULLDUGGERY: the mainThread steals the process main thread
226 // which will then be scheduled by the mainProcessor normally
227 mainThread = (thread$ *)&storage_mainThread;
228 current_stack_info_t info;
229 info.storage = (__stack_t*)&storage_mainThreadCtx;
230 (*mainThread){ &info };
231
232 __cfadbg_print_safe(runtime_core, "Kernel : Main thread ready\n");
233
234 //initialize the global state variables
235 __cfaabi_tls.this_processor = mainProcessor;
236 __cfaabi_tls.this_thread = mainThread;
237
238 #if !defined( __CFA_NO_STATISTICS__ )
239 __cfaabi_tls.this_stats = (__stats_t *)& storage_mainProcStats;
240 __init_stats( __cfaabi_tls.this_stats );
241 #endif
242 mainProcessor->local_data = &__cfaabi_tls;
243
244 // Enable preemption
245 __kernel_alarm_startup();
246
247 // Add the main thread to the ready queue
248 // once resume is called on mainProcessor->runner the mainThread needs to be scheduled like any normal thread
249 schedule_thread$(mainThread, UNPARK_LOCAL);
250
251 // SKULLDUGGERY: Force a context switch to the main processor to set the main thread's context to the current UNIX
252 // context. Hence, the main thread does not begin through __cfactx_invoke_thread, like all other threads. The trick here is that
253 // mainThread is on the ready queue when this call is made.
254 __kernel_first_resume( __cfaabi_tls.this_processor );
255
256
257 // THE SYSTEM IS NOW COMPLETELY RUNNING
258
259 __cfadbg_print_safe(runtime_core, "Kernel : Started\n--------------------------------------------------\n\n");
260
261 /* paranoid */ verify( ! __preemption_enabled() );
262 enable_interrupts();
263 /* paranoid */ verify( __preemption_enabled() );
264
265}
266
267extern "C"{
268 void pthread_delete_kernel_threads_();
269}
270
271
272static void __kernel_shutdown(void) {
273 if(!cfa_main_returned) return;
274
275 //delete kernel threads for pthread_concurrency
276 pthread_delete_kernel_threads_();
277
278 /* paranoid */ verify( __preemption_enabled() );
279 disable_interrupts();
280 /* paranoid */ verify( ! __preemption_enabled() );
281
282 __cfadbg_print_safe(runtime_core, "\n--------------------------------------------------\nKernel : Shutting down\n");
283
284 // SKULLDUGGERY: Notify the mainProcessor it needs to terminates.
285 // When its coroutine terminates, it return control to the mainThread
286 // which is currently here
287 /* paranoid */ verify( !__atomic_load_n(&mainProcessor->do_terminate, __ATOMIC_ACQUIRE) );
288 __atomic_store_n(&mainProcessor->do_terminate, true, __ATOMIC_RELEASE);
289 __wake_proc( mainProcessor );
290 __kernel_last_resume( __cfaabi_tls.this_processor );
291 mainThread->self_cor.state = Halted;
292
293 // THE SYSTEM IS NOW COMPLETELY STOPPED
294
295 // Disable preemption
296 __kernel_alarm_shutdown();
297
298 #if !defined( __CFA_NO_STATISTICS__ )
299 __stats_t * st = (__stats_t *)& storage_mainProcStats;
300 __tally_stats(mainCluster->stats, st);
301 if( 0 != mainProcessor->print_stats ) {
302 __print_stats( st, mainProcessor->print_stats, "Processor ", mainProcessor->name, (void*)mainProcessor );
303 }
304 #if defined(CFA_STATS_ARRAY)
305 __flush_stat( st, "Processor", mainProcessor );
306 #endif
307 #endif
308
309 mainProcessor->local_data = 0p;
310
311 unregister_tls( mainProcessor );
312 __cfa_io_stop( mainProcessor );
313
314 // Destroy the main processor and its context in reverse order of construction
315 // These were manually constructed so we need manually destroy them
316 void ^?{}(processor & this) with( this ){
317 deinit( this );
318
319 /* paranoid */ verify( this.do_terminate == true );
320 __cfadbg_print_safe(runtime_core, "Kernel : destroyed main processor context %p\n", &runner);
321 }
322
323 ^(*mainProcessor){};
324
325 // Final step, destroy the main thread since it is no longer needed
326
327 // Since we provided a stack to this taxk it will not destroy anything
328 /* paranoid */ verify(mainThread->self_cor.stack.storage == (__stack_t*)(((uintptr_t)&storage_mainThreadCtx)| 0x1));
329 ^(*mainThread){};
330
331 ^(*mainCluster){};
332
333 ^(__scheduler_lock){};
334
335 ^(__cfa_dbg_global_clusters.list){};
336 ^(__cfa_dbg_global_clusters.lock){};
337
338 __cfadbg_print_safe(runtime_core, "Kernel : Shutdown complete\n");
339}
340
341//=============================================================================================
342// Kernel Initial Scheduling logic
343//=============================================================================================
344
345// Context invoker for processors
346// This is the entry point for processors (kernel threads) *except* for the main processor
347// It effectively constructs a coroutine by stealing the pthread stack
348static void * __invoke_processor(void * arg) {
349 #if !defined( __CFA_NO_STATISTICS__ )
350 __stats_t local_stats;
351 __init_stats( &local_stats );
352 __cfaabi_tls.this_stats = &local_stats;
353 #endif
354
355 processor * proc = (processor *) arg;
356 __cfaabi_tls.this_processor = proc;
357 __cfaabi_tls.this_thread = 0p;
358 __cfaabi_tls.preemption_state.[enabled, disable_count] = [false, 1];
359 proc->local_data = &__cfaabi_tls;
360
361 heapManagerCtor(); // initialize heap
362
363 __cfa_io_start( proc );
364 register_tls( proc );
365
366 // SKULLDUGGERY: We want to create a context for the processor coroutine
367 // which is needed for the 2-step context switch. However, there is no reason
368 // to waste the perfectly valid stack create by pthread.
369 current_stack_info_t info;
370 __stack_t ctx;
371 info.storage = &ctx;
372 (proc->runner){ proc, &info };
373
374 __cfadbg_print_safe(runtime_core, "Coroutine : created stack %p\n", get_coroutine(proc->runner)->stack.storage);
375
376 //Set global state
377 __cfaabi_tls.this_thread = 0p;
378
379 //We now have a proper context from which to schedule threads
380 __cfadbg_print_safe(runtime_core, "Kernel : core %p created (%p, %p)\n", proc, &proc->runner, &ctx);
381
382 // SKULLDUGGERY: Since the coroutine doesn't have its own stack, we can't
383 // resume it to start it like it normally would, it will just context switch
384 // back to here. Instead directly call the main since we already are on the
385 // appropriate stack.
386 get_coroutine(proc->runner)->state = Active;
387 main( proc->runner );
388 get_coroutine(proc->runner)->state = Halted;
389
390 // Main routine of the core returned, the core is now fully terminated
391 __cfadbg_print_safe(runtime_core, "Kernel : core %p main ended (%p)\n", proc, &proc->runner);
392
393 #if !defined(__CFA_NO_STATISTICS__)
394 __tally_stats(proc->cltr->stats, &local_stats);
395 if( 0 != proc->print_stats ) {
396 __print_stats( &local_stats, proc->print_stats, "Processor ", proc->name, (void*)proc );
397 }
398 #if defined(CFA_STATS_ARRAY)
399 __flush_stat( &local_stats, "Processor", proc );
400 #endif
401 #endif
402
403 proc->local_data = 0p;
404
405 unregister_tls( proc );
406 __cfa_io_stop( proc );
407
408 heapManagerDtor(); // de-initialize heap
409
410 return 0p;
411}
412
413static void __kernel_first_resume( processor * this ) {
414 thread$ * src = mainThread;
415 coroutine$ * dst = get_coroutine(this->runner);
416
417 /* paranoid */ verify( ! __preemption_enabled() );
418
419 __cfaabi_tls.this_thread->curr_cor = dst;
420 __stack_prepare( &dst->stack, DEFAULT_STACK_SIZE );
421 __cfactx_start(main, dst, this->runner, __cfactx_invoke_coroutine);
422
423 /* paranoid */ verify( ! __preemption_enabled() );
424
425 dst->last = &src->self_cor;
426 dst->starter = dst->starter ? dst->starter : &src->self_cor;
427
428 // make sure the current state is still correct
429 /* paranoid */ verify(src->state == Ready);
430 src->corctx_flag = true;
431
432 // context switch to specified coroutine
433 verify( dst->context.SP );
434 __cfactx_switch( &src->context, &dst->context );
435 // when __cfactx_switch returns we are back in the src coroutine
436
437 mainThread->curr_cor = &mainThread->self_cor;
438
439 // make sure the current state has been update
440 /* paranoid */ verify(src->state == Active);
441
442 /* paranoid */ verify( ! __preemption_enabled() );
443}
444
445// KERNEL_ONLY
446static void __kernel_last_resume( processor * this ) {
447 coroutine$ * src = &mainThread->self_cor;
448 coroutine$ * dst = get_coroutine(this->runner);
449
450 /* paranoid */ verify( ! __preemption_enabled() );
451 /* paranoid */ verify( dst->starter == src );
452 /* paranoid */ verify( dst->context.SP );
453
454 // SKULLDUGGERY in debug the processors check that the
455 // stack is still within the limit of the stack limits after running a thread.
456 // that check doesn't make sense if we context switch to the processor using the
457 // coroutine semantics. Since this is a special case, use the current context
458 // info to populate these fields.
459 __cfaabi_dbg_debug_do(
460 __stack_context_t ctx;
461 CtxGet( ctx );
462 mainThread->context.SP = ctx.SP;
463 mainThread->context.FP = ctx.FP;
464 )
465
466 // context switch to the processor
467 __cfactx_switch( &src->context, &dst->context );
468}
469
470
471//=============================================================================================
472// Kernel Object Constructors logic
473//=============================================================================================
474//-----------------------------------------------------------------------------
475// Main thread construction
476static void ?{}( coroutine$ & this, current_stack_info_t * info) with( this ) {
477 stack.storage = info->storage;
478 with(*stack.storage) {
479 limit = info->limit;
480 base = info->base;
481 }
482 __attribute__((may_alias)) intptr_t * istorage = (intptr_t*) &stack.storage;
483 *istorage |= 0x1;
484 name = "Main Thread";
485 state = Start;
486 starter = 0p;
487 last = 0p;
488 cancellation = 0p;
489}
490
491static void ?{}( thread$ & this, current_stack_info_t * info) with( this ) {
492 ticket = TICKET_RUNNING;
493 state = Start;
494 self_cor{ info };
495 curr_cor = &self_cor;
496 curr_cluster = mainCluster;
497 self_mon.owner = &this;
498 self_mon.recursion = 1;
499 self_mon_p = &self_mon;
500 rdy_link.next = 0p;
501 rdy_link.ts = MAX;
502 user_link.next = 0p;
503 user_link.prev = 0p;
504 cltr_link.next = 0p;
505 cltr_link.prev = 0p;
506 preferred = ready_queue_new_preferred();
507 last_proc = 0p;
508 PRNG_SET_SEED( random_state, __global_random_mask ? __global_random_prime : __global_random_prime ^ rdtscl() );
509 #if defined( __CFA_WITH_VERIFY__ )
510 executing = 0p;
511 canary = 0x0D15EA5E0D15EA5Ep;
512 #endif
513
514 doregister(curr_cluster, this);
515
516 monitors{ &self_mon_p, 1, (fptr_t)0 };
517}
518
519//-----------------------------------------------------------------------------
520// Processor
521// Construct the processor context of non-main processors
522static void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info) {
523 (this.self){ info };
524 this.proc = proc;
525}
526
527static void init(processor & this, const char name[], cluster & _cltr, thread$ * initT) with( this ) {
528 this.name = name;
529 this.cltr = &_cltr;
530 __atomic_add_fetch( &_cltr.procs.constructed, 1u, __ATOMIC_RELAXED );
531 this.rdq.its = 0;
532 this.rdq.itr = 0;
533 this.rdq.id = 0;
534 this.rdq.target = MAX;
535 this.rdq.last = MAX;
536 this.rdq.cpu = 0;
537 // this.rdq.cutoff = 0ull;
538 do_terminate = false;
539 preemption_alarm = 0p;
540 pending_preemption = false;
541
542 this.io.ctx = 0p;
543 this.io.pending = false;
544 this.io.dirty = false;
545
546 this.init.thrd = initT;
547
548 this.local_data = 0p;
549
550 idle_wctx.evfd = eventfd(0, 0);
551 if (idle_wctx.evfd < 0) {
552 abort("KERNEL ERROR: PROCESSOR EVENTFD - %s\n", strerror(errno));
553 }
554
555 idle_wctx.sem = 0;
556 idle_wctx.wake__time = 0;
557
558 // I'm assuming these two are reserved for standard input and output
559 // so I'm using them as sentinels with idle_wctx.
560 /* paranoid */ verify( idle_wctx.evfd != 0 );
561 /* paranoid */ verify( idle_wctx.evfd != 1 );
562
563 #if !defined(__CFA_NO_STATISTICS__)
564 print_stats = 0;
565 print_halts = false;
566 #endif
567
568 __cfadbg_print_safe(runtime_core, "Kernel : core %p created\n", &this);
569}
570
571// Not a ctor, it just preps the destruction but should not destroy members
572static void deinit(processor & this) {
573 close(this.idle_wctx.evfd);
574}
575
576void ?{}(processor & this, const char name[], cluster & _cltr, thread$ * initT) libcfa_public {
577 ( this.terminated ){};
578 ( this.runner ){};
579
580 disable_interrupts();
581 init( this, name, _cltr, initT );
582 enable_interrupts();
583
584 __cfadbg_print_safe(runtime_core, "Kernel : Starting core %p\n", &this);
585
586 this.stack = __create_pthread( &this.kernel_thread, __invoke_processor, (void *)&this );
587}
588
589void ?{}(processor & this, const char name[], cluster & _cltr) libcfa_public {
590 (this){name, _cltr, 0p};
591}
592
593extern size_t __page_size;
594void ^?{}(processor & this) libcfa_public with( this ) {
595 /* paranoid */ verify( !__atomic_load_n(&do_terminate, __ATOMIC_ACQUIRE) );
596 __cfadbg_print_safe(runtime_core, "Kernel : core %p signaling termination\n", &this);
597
598 __atomic_sub_fetch( &this.cltr->procs.constructed, 1u, __ATOMIC_RELAXED );
599
600 __atomic_store_n(&do_terminate, true, __ATOMIC_RELAXED);
601 __disable_interrupts_checked();
602 __wake_proc( &this );
603 __enable_interrupts_checked();
604
605 wait( terminated );
606 /* paranoid */ verify( active_processor() != &this);
607
608 __destroy_pthread( kernel_thread, this.stack, 0p );
609
610 disable_interrupts();
611 deinit( this );
612 enable_interrupts();
613}
614
615//-----------------------------------------------------------------------------
616// Cluster
617static void ?{}(__cluster_proc_list & this) {
618 this.fdw = 0p;
619 this.idle = 0;
620 this.constructed = 0;
621 this.total = 0;
622}
623
624void ?{}(cluster & this, const char name[], Duration preemption_rate, unsigned num_io, const io_context_params & io_params) libcfa_public with( this ) {
625 this.name = name;
626 this.preemption_rate = preemption_rate;
627 this.sched.readyQ.data = 0p;
628 this.sched.readyQ.tscs = 0p;
629 this.sched.readyQ.count = 0;
630 this.sched.io.tscs = 0p;
631 this.sched.io.data = 0p;
632 this.sched.caches = 0p;
633
634 #if !defined(__CFA_NO_STATISTICS__)
635 print_stats = 0;
636 stats = alloc();
637 __init_stats( stats );
638 #endif
639
640 threads{};
641
642 io.arbiter = create();
643 io.params = io_params;
644
645 managed.procs = 0p;
646 managed.cnt = 0;
647
648 doregister(this);
649
650 // Lock the RWlock so no-one pushes/pops while we are changing the queue
651 disable_interrupts();
652 uint_fast32_t last_size = ready_mutate_lock();
653
654 // Adjust the ready queue size
655 ready_queue_grow( &this );
656
657 // Unlock the RWlock
658 ready_mutate_unlock( last_size );
659 enable_interrupts( false ); // Don't poll, could be in main cluster
660}
661
662void ^?{}(cluster & this) libcfa_public {
663 set_concurrency( this, 0 );
664
665 destroy(this.io.arbiter);
666
667 // Lock the RWlock so no-one pushes/pops while we are changing the queue
668 disable_interrupts();
669 uint_fast32_t last_size = ready_mutate_lock();
670
671 // Adjust the ready queue size
672 ready_queue_shrink( &this );
673
674 // Unlock the RWlock
675 ready_mutate_unlock( last_size );
676
677 ready_queue_close( &this );
678 /* paranoid */ verify( this.sched.readyQ.data == 0p );
679 /* paranoid */ verify( this.sched.readyQ.tscs == 0p );
680 /* paranoid */ verify( this.sched.readyQ.count == 0 );
681 /* paranoid */ verify( this.sched.io.tscs == 0p );
682 /* paranoid */ verify( this.sched.caches == 0p );
683
684 enable_interrupts( false ); // Don't poll, could be in main cluster
685
686
687 #if !defined(__CFA_NO_STATISTICS__)
688 if( 0 != this.print_stats ) {
689 __print_stats( this.stats, this.print_stats, "Cluster", this.name, (void*)&this );
690 }
691 #if defined(CFA_STATS_ARRAY)
692 __flush_stat( this.stats, "Cluster", &this );
693 #endif
694 free( this.stats );
695 #endif
696
697 unregister(this);
698}
699
700//=============================================================================================
701// Miscellaneous Initialization
702//=============================================================================================
703//-----------------------------------------------------------------------------
704// Global Queues
705static void doregister( cluster & cltr ) {
706 lock ( __cfa_dbg_global_clusters.lock __cfaabi_dbg_ctx2);
707 push_front( __cfa_dbg_global_clusters.list, cltr );
708 unlock ( __cfa_dbg_global_clusters.lock );
709}
710
711static void unregister( cluster & cltr ) {
712 lock ( __cfa_dbg_global_clusters.lock __cfaabi_dbg_ctx2);
713 remove( __cfa_dbg_global_clusters.list, cltr );
714 unlock( __cfa_dbg_global_clusters.lock );
715}
716
717void doregister( cluster * cltr, thread$ & thrd ) {
718 lock (cltr->thread_list_lock __cfaabi_dbg_ctx2);
719 cltr->nthreads += 1;
720 insert_first(cltr->threads, thrd);
721 unlock (cltr->thread_list_lock);
722}
723
724void unregister( cluster * cltr, thread$ & thrd ) {
725 lock (cltr->thread_list_lock __cfaabi_dbg_ctx2);
726 {
727 tytagref( dlink(thread$), dlink(thread$) ) ?`inner( thread$ & this ) = void;
728 with( DLINK_VIA( thread$, struct __thread_user_link ) )
729 remove( thrd );
730 cltr->nthreads -= 1;
731 }
732 unlock(cltr->thread_list_lock);
733}
734
735static void register_tls( processor * this ) {
736 // Register and Lock the RWlock so no-one pushes/pops while we are changing the queue
737 uint_fast32_t last_size;
738 [this->unique_id, last_size] = ready_mutate_register();
739
740 this->rdq.cpu = __kernel_getcpu();
741
742 this->cltr->procs.total += 1u;
743 insert_last(this->cltr->procs.actives, *this);
744
745 // Adjust the ready queue size
746 ready_queue_grow( this->cltr );
747
748 // Unlock the RWlock
749 ready_mutate_unlock( last_size );
750}
751
752
753static void unregister_tls( processor * this ) {
754 // Lock the RWlock so no-one pushes/pops while we are changing the queue
755 uint_fast32_t last_size = ready_mutate_lock();
756 this->cltr->procs.total -= 1u;
757 remove(*this);
758
759 // clear the cluster so nothing gets pushed to local queues
760 cluster * cltr = this->cltr;
761 this->cltr = 0p;
762
763 // Adjust the ready queue size
764 ready_queue_shrink( cltr );
765
766 // Unlock the RWlock and unregister: we don't need the read_lock any more
767 ready_mutate_unregister( this->unique_id, last_size );
768}
769
770static void check( int ret, const char func[] ) {
771 if ( ret ) { // pthread routines return errno values
772 abort( "%s : internal error, error(%d) %s.", func, ret, strerror( ret ) );
773 } // if
774} // Abort
775
776void * __create_pthread( pthread_t * pthread, void * (*start)(void *), void * arg ) {
777 pthread_attr_t attr;
778
779 check( __cfaabi_pthread_attr_init( &attr ), "pthread_attr_init" ); // initialize attribute
780
781 size_t stacksize = max( PTHREAD_STACK_MIN, DEFAULT_STACK_SIZE );
782
783 void * stack;
784 #if CFA_PROCESSOR_USE_MMAP
785 stacksize = ceiling( stacksize, __page_size ) + __page_size;
786 stack = mmap(0p, stacksize, __map_prot, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
787 if(stack == ((void*)-1)) {
788 abort( "pthread stack creation : internal error, mmap failure, error(%d) %s.", errno, strerror( errno ) );
789 }
790 if ( mprotect( stack, __page_size, PROT_NONE ) == -1 ) {
791 abort( "pthread stack creation : internal error, mprotect failure, error(%d) %s.", errno, strerror( errno ) );
792 } // if
793 #else
794 __cfaabi_dbg_debug_do(
795 stack = memalign( __page_size, stacksize + __page_size );
796 // pthread has no mechanism to create the guard page in user supplied stack.
797 if ( mprotect( stack, __page_size, PROT_NONE ) == -1 ) {
798 abort( "mprotect : internal error, mprotect failure, error(%d) %s.", errno, strerror( errno ) );
799 } // if
800 );
801 __cfaabi_dbg_no_debug_do(
802 stack = malloc( stacksize );
803 );
804 #endif
805
806 check( __cfaabi_pthread_attr_setstack( &attr, stack, stacksize ), "pthread_attr_setstack" );
807 check( __cfaabi_pthread_create( pthread, &attr, start, arg ), "pthread_create" );
808 return stack;
809}
810
811void __destroy_pthread( pthread_t pthread, void * stack, void ** retval ) {
812 int err = __cfaabi_pthread_join( pthread, retval );
813 if( err != 0 ) abort("KERNEL ERROR: joining pthread %p caused error %s\n", (void*)pthread, strerror(err));
814
815 #if CFA_PROCESSOR_USE_MMAP
816 pthread_attr_t attr;
817
818 check( __cfaabi_pthread_attr_init( &attr ), "pthread_attr_init" ); // initialize attribute
819
820 size_t stacksize;
821 // default stack size, normally defined by shell limit
822 check( __cfaabi_pthread_attr_getstacksize( &attr, &stacksize ), "pthread_attr_getstacksize" );
823 assert( stacksize >= PTHREAD_STACK_MIN );
824 stacksize += __page_size;
825
826 if(munmap(stack, stacksize) == -1) {
827 abort( "pthread stack destruction : internal error, munmap failure, error(%d) %s.", errno, strerror( errno ) );
828 }
829 #else
830 __cfaabi_dbg_debug_do(
831 // pthread has no mechanism to create the guard page in user supplied stack.
832 if ( mprotect( stack, __page_size, __map_prot ) == -1 ) {
833 abort( "mprotect : internal error, mprotect failure, error(%d) %s.", errno, strerror( errno ) );
834 } // if
835 );
836 free( stack );
837 #endif
838}
839
840unsigned set_concurrency( cluster & this, unsigned new ) libcfa_public {
841 unsigned old = this.managed.cnt;
842
843 __cfadbg_print_safe(runtime_core, "Kernel : resizing cluster from %u to %u\n", old, (unsigned)new);
844
845 // Delete all the old unneeded procs
846 if(old > new) for(i; (unsigned)new ~ old) {
847 __cfadbg_print_safe(runtime_core, "Kernel : destroying %u\n", i);
848 delete( this.managed.procs[i] );
849 }
850
851 // Allocate new array (uses realloc and memcpies the data)
852 this.managed.procs = alloc( new, this.managed.procs`realloc );
853 this.managed.cnt = new;
854
855 // Create the desired new procs
856 if(old < new) for(i; old ~ new) {
857 __cfadbg_print_safe(runtime_core, "Kernel : constructing %u\n", i);
858 (*(this.managed.procs[i] = alloc())){ this };
859 }
860
861 // return the old count
862 return old;
863}
864
865#if defined(__CFA_WITH_VERIFY__)
866static bool verify_fwd_bck_rng(void) {
867 __cfaabi_tls.ready_rng.fwd_seed = 25214903917_l64u * (rdtscl() ^ (uintptr_t)&verify_fwd_bck_rng);
868
869 unsigned values[10];
870 for(i; 10) {
871 values[i] = __tls_rand_fwd();
872 }
873
874 __tls_rand_advance_bck();
875
876 for ( i; 9 -~= 0 ) {
877 if(values[i] != __tls_rand_bck()) {
878 return false;
879 }
880 }
881
882 return true;
883}
884#endif
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