source: libcfa/src/concurrency/kernel/startup.cfa @ ab5baab

arm-ehjacob/cs343-translationnew-ast-unique-expr
Last change on this file since ab5baab was ab5baab, checked in by Thierry Delisle <tdelisle@…>, 4 months ago

Attempt to fix the stack checker for when coroutines are interrupted at the wrong moment

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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// C Includes
19#include <errno.h>              // errno
20#include <string.h>             // strerror
21#include <unistd.h>             // sysconf
22extern "C" {
23      #include <limits.h>       // PTHREAD_STACK_MIN
24        #include <sys/eventfd.h>  // eventfd
25      #include <sys/mman.h>     // mprotect
26      #include <sys/resource.h> // getrlimit
27}
28
29// CFA Includes
30#include "kernel_private.hfa"
31#include "startup.hfa"          // STARTUP_PRIORITY_XXX
32#include "math.hfa"
33
34#define CFA_PROCESSOR_USE_MMAP 0
35
36//-----------------------------------------------------------------------------
37// Some assembly required
38#if defined( __i386 )
39        #define CtxGet( ctx ) __asm__ volatile ( \
40                "movl %%esp,%0\n" \
41                "movl %%ebp,%1\n" \
42                : "=rm" (ctx.SP), \
43                  "=rm" (ctx.FP) \
44        )
45#elif defined( __x86_64 )
46        #define CtxGet( ctx ) __asm__ volatile ( \
47                "movq %%rsp,%0\n" \
48                "movq %%rbp,%1\n" \
49                : "=rm" (ctx.SP), \
50                  "=rm" (ctx.FP) \
51        )
52#elif defined( __aarch64__ )
53        #define CtxGet( ctx ) __asm__ volatile ( \
54                "mov %0, sp\n" \
55                "mov %1, fp\n" \
56                : "=rm" (ctx.SP), \
57                  "=rm" (ctx.FP) \
58        )
59#else
60        #error unknown hardware architecture
61#endif
62
63//-----------------------------------------------------------------------------
64// Start and stop routine for the kernel, declared first to make sure they run first
65static void __kernel_startup (void) __attribute__(( constructor( STARTUP_PRIORITY_KERNEL ) ));
66static void __kernel_shutdown(void) __attribute__(( destructor ( STARTUP_PRIORITY_KERNEL ) ));
67
68//-----------------------------------------------------------------------------
69// Static Forward Declarations
70struct current_stack_info_t;
71
72static void * __invoke_processor(void * arg);
73static void __kernel_first_resume( processor * this );
74static void __kernel_last_resume ( processor * this );
75static void init(processor & this, const char name[], cluster & _cltr, $thread * initT);
76static void deinit(processor & this);
77static void doregister( struct cluster & cltr );
78static void unregister( struct cluster & cltr );
79static void register_tls( processor * this );
80static void unregister_tls( processor * this );
81static void ?{}( $coroutine & this, current_stack_info_t * info);
82static void ?{}( $thread & this, current_stack_info_t * info);
83static void ?{}(processorCtx_t & this) {}
84static void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info);
85
86#if defined(__CFA_WITH_VERIFY__)
87        static bool verify_fwd_bck_rng(void);
88#endif
89
90//-----------------------------------------------------------------------------
91// Forward Declarations for other modules
92extern void __kernel_alarm_startup(void);
93extern void __kernel_alarm_shutdown(void);
94
95//-----------------------------------------------------------------------------
96// Other Forward Declarations
97extern void __wake_proc(processor *);
98
99//-----------------------------------------------------------------------------
100// Kernel storage
101KERNEL_STORAGE(cluster,              mainCluster);
102KERNEL_STORAGE(processor,            mainProcessor);
103KERNEL_STORAGE($thread,              mainThread);
104KERNEL_STORAGE(__stack_t,            mainThreadCtx);
105KERNEL_STORAGE(__scheduler_RWLock_t, __scheduler_lock);
106#if !defined(__CFA_NO_STATISTICS__)
107KERNEL_STORAGE(__stats_t, mainProcStats);
108#endif
109
110cluster              * mainCluster;
111processor            * mainProcessor;
112$thread              * mainThread;
113__scheduler_RWLock_t * __scheduler_lock;
114
115extern "C" {
116        struct { __dllist_t(cluster) list; __spinlock_t lock; } __cfa_dbg_global_clusters;
117}
118
119extern size_t __page_size;
120extern int __map_prot;
121
122//-----------------------------------------------------------------------------
123// Global state
124thread_local struct KernelThreadData __cfaabi_tls __attribute__ ((tls_model ( "initial-exec" ))) @= {
125        NULL,                                                                                           // cannot use 0p
126        NULL,
127        false,
128        { 1, false, false },
129        0,
130        { 0, 0 },
131        NULL,
132        #ifdef __CFA_WITH_VERIFY__
133                false,
134                0,
135        #endif
136};
137
138//-----------------------------------------------------------------------------
139// Struct to steal stack
140struct current_stack_info_t {
141        __stack_t * storage;  // pointer to stack object
142        void * base;          // base of stack
143        void * limit;         // stack grows towards stack limit
144        void * context;       // address of cfa_context_t
145};
146
147void ?{}( current_stack_info_t & this ) {
148        __stack_context_t ctx;
149        CtxGet( ctx );
150        this.base = ctx.FP;
151
152        rlimit r;
153        getrlimit( RLIMIT_STACK, &r);
154        size_t size = r.rlim_cur;
155
156        this.limit = (void *)(((intptr_t)this.base) - size);
157        this.context = &storage_mainThreadCtx;
158}
159
160
161
162//=============================================================================================
163// Kernel Setup logic
164//=============================================================================================
165//-----------------------------------------------------------------------------
166// Kernel boot procedures
167static void __kernel_startup(void) {
168        /* paranoid */ verify( ! __preemption_enabled() );
169        __cfadbg_print_safe(runtime_core, "Kernel : Starting\n");
170
171        __cfa_dbg_global_clusters.list{ __get };
172        __cfa_dbg_global_clusters.lock{};
173
174        /* paranoid */ verify( verify_fwd_bck_rng() );
175
176        // Initialize the global scheduler lock
177        __scheduler_lock = (__scheduler_RWLock_t*)&storage___scheduler_lock;
178        (*__scheduler_lock){};
179
180        // Initialize the main cluster
181        mainCluster = (cluster *)&storage_mainCluster;
182        (*mainCluster){"Main Cluster", 0};
183
184        __cfadbg_print_safe(runtime_core, "Kernel : Main cluster ready\n");
185
186        // Start by initializing the main thread
187        // SKULLDUGGERY: the mainThread steals the process main thread
188        // which will then be scheduled by the mainProcessor normally
189        mainThread = ($thread *)&storage_mainThread;
190        current_stack_info_t info;
191        info.storage = (__stack_t*)&storage_mainThreadCtx;
192        (*mainThread){ &info };
193
194        __cfadbg_print_safe(runtime_core, "Kernel : Main thread ready\n");
195
196
197
198        // Construct the processor context of the main processor
199        void ?{}(processorCtx_t & this, processor * proc) {
200                (this.__cor){ "Processor" };
201                this.__cor.starter = 0p;
202                this.proc = proc;
203        }
204
205        void ?{}(processor & this) with( this ) {
206                ( this.terminated ){};
207                ( this.runner ){};
208                init( this, "Main Processor", *mainCluster, 0p );
209                kernel_thread = pthread_self();
210
211                runner{ &this };
212                __cfadbg_print_safe(runtime_core, "Kernel : constructed main processor context %p\n", &runner);
213        }
214
215        // Initialize the main processor and the main processor ctx
216        // (the coroutine that contains the processing control flow)
217        mainProcessor = (processor *)&storage_mainProcessor;
218        (*mainProcessor){};
219
220        register_tls( mainProcessor );
221
222        //initialize the global state variables
223        __cfaabi_tls.this_processor = mainProcessor;
224        __cfaabi_tls.this_thread    = mainThread;
225
226        #if !defined( __CFA_NO_STATISTICS__ )
227                __cfaabi_tls.this_stats = (__stats_t *)& storage_mainProcStats;
228                __init_stats( __cfaabi_tls.this_stats );
229        #endif
230        mainProcessor->local_data = &__cfaabi_tls;
231
232        // Enable preemption
233        __kernel_alarm_startup();
234
235        // Add the main thread to the ready queue
236        // once resume is called on mainProcessor->runner the mainThread needs to be scheduled like any normal thread
237        schedule_thread$(mainThread);
238
239        // SKULLDUGGERY: Force a context switch to the main processor to set the main thread's context to the current UNIX
240        // context. Hence, the main thread does not begin through __cfactx_invoke_thread, like all other threads. The trick here is that
241        // mainThread is on the ready queue when this call is made.
242        __kernel_first_resume( __cfaabi_tls.this_processor );
243
244
245        // THE SYSTEM IS NOW COMPLETELY RUNNING
246
247        __cfadbg_print_safe(runtime_core, "Kernel : Started\n--------------------------------------------------\n\n");
248
249        /* paranoid */ verify( ! __preemption_enabled() );
250        enable_interrupts();
251        /* paranoid */ verify( __preemption_enabled() );
252
253}
254
255static void __kernel_shutdown(void) {
256        /* paranoid */ verify( __preemption_enabled() );
257        disable_interrupts();
258        /* paranoid */ verify( ! __preemption_enabled() );
259
260        __cfadbg_print_safe(runtime_core, "\n--------------------------------------------------\nKernel : Shutting down\n");
261
262        // SKULLDUGGERY: Notify the mainProcessor it needs to terminates.
263        // When its coroutine terminates, it return control to the mainThread
264        // which is currently here
265        __atomic_store_n(&mainProcessor->do_terminate, true, __ATOMIC_RELEASE);
266        __kernel_last_resume( __cfaabi_tls.this_processor );
267        mainThread->self_cor.state = Halted;
268
269        // THE SYSTEM IS NOW COMPLETELY STOPPED
270
271        // Disable preemption
272        __kernel_alarm_shutdown();
273
274        #if !defined( __CFA_NO_STATISTICS__ )
275                __stats_t * st = (__stats_t *)& storage_mainProcStats;
276                __tally_stats(mainCluster->stats, st);
277                if( 0 != mainProcessor->print_stats ) {
278                        __print_stats( st, mainProcessor->print_stats, "Processor ", mainProcessor->name, (void*)mainProcessor );
279                }
280                #if defined(CFA_STATS_ARRAY)
281                        __flush_stat( st, "Processor", mainProcessor );
282                #endif
283        #endif
284
285        mainProcessor->local_data = 0p;
286
287        unregister_tls( mainProcessor );
288
289        // Destroy the main processor and its context in reverse order of construction
290        // These were manually constructed so we need manually destroy them
291        void ^?{}(processor & this) with( this ){
292                deinit( this );
293
294                /* paranoid */ verify( this.do_terminate == true );
295                __cfaabi_dbg_print_safe("Kernel : destroyed main processor context %p\n", &runner);
296        }
297
298        ^(*mainProcessor){};
299
300        // Final step, destroy the main thread since it is no longer needed
301
302        // Since we provided a stack to this taxk it will not destroy anything
303        /* paranoid */ verify(mainThread->self_cor.stack.storage == (__stack_t*)(((uintptr_t)&storage_mainThreadCtx)| 0x1));
304        ^(*mainThread){};
305
306        ^(*mainCluster){};
307
308        ^(*__scheduler_lock){};
309
310        ^(__cfa_dbg_global_clusters.list){};
311        ^(__cfa_dbg_global_clusters.lock){};
312
313        __cfadbg_print_safe(runtime_core, "Kernel : Shutdown complete\n");
314}
315
316//=============================================================================================
317// Kernel Initial Scheduling logic
318//=============================================================================================
319
320// Context invoker for processors
321// This is the entry point for processors (kernel threads) *except* for the main processor
322// It effectively constructs a coroutine by stealing the pthread stack
323static void * __invoke_processor(void * arg) {
324        #if !defined( __CFA_NO_STATISTICS__ )
325                __stats_t local_stats;
326                __init_stats( &local_stats );
327                __cfaabi_tls.this_stats = &local_stats;
328        #endif
329
330        processor * proc = (processor *) arg;
331        __cfaabi_tls.this_processor = proc;
332        __cfaabi_tls.this_thread    = 0p;
333        __cfaabi_tls.preemption_state.[enabled, disable_count] = [false, 1];
334        proc->local_data = &__cfaabi_tls;
335
336        register_tls( proc );
337
338        // SKULLDUGGERY: We want to create a context for the processor coroutine
339        // which is needed for the 2-step context switch. However, there is no reason
340        // to waste the perfectly valid stack create by pthread.
341        current_stack_info_t info;
342        __stack_t ctx;
343        info.storage = &ctx;
344        (proc->runner){ proc, &info };
345
346        __cfaabi_dbg_print_safe("Coroutine : created stack %p\n", get_coroutine(proc->runner)->stack.storage);
347
348        //Set global state
349        __cfaabi_tls.this_thread = 0p;
350
351        //We now have a proper context from which to schedule threads
352        __cfadbg_print_safe(runtime_core, "Kernel : core %p created (%p, %p)\n", proc, &proc->runner, &ctx);
353
354        // SKULLDUGGERY: Since the coroutine doesn't have its own stack, we can't
355        // resume it to start it like it normally would, it will just context switch
356        // back to here. Instead directly call the main since we already are on the
357        // appropriate stack.
358        get_coroutine(proc->runner)->state = Active;
359        main( proc->runner );
360        get_coroutine(proc->runner)->state = Halted;
361
362        // Main routine of the core returned, the core is now fully terminated
363        __cfadbg_print_safe(runtime_core, "Kernel : core %p main ended (%p)\n", proc, &proc->runner);
364
365        #if !defined(__CFA_NO_STATISTICS__)
366                __tally_stats(proc->cltr->stats, &local_stats);
367                if( 0 != proc->print_stats ) {
368                        __print_stats( &local_stats, proc->print_stats, "Processor ", proc->name, (void*)proc );
369                }
370                #if defined(CFA_STATS_ARRAY)
371                        __flush_stat( &local_stats, "Processor", proc );
372                #endif
373        #endif
374
375        proc->local_data = 0p;
376
377        unregister_tls( proc );
378
379        return 0p;
380}
381
382static void __kernel_first_resume( processor * this ) {
383        $thread * src = mainThread;
384        $coroutine * dst = get_coroutine(this->runner);
385
386        /* paranoid */ verify( ! __preemption_enabled() );
387
388        __cfaabi_tls.this_thread->curr_cor = dst;
389        __stack_prepare( &dst->stack, 65000 );
390        __cfactx_start(main, dst, this->runner, __cfactx_invoke_coroutine);
391
392        /* paranoid */ verify( ! __preemption_enabled() );
393
394        dst->last = &src->self_cor;
395        dst->starter = dst->starter ? dst->starter : &src->self_cor;
396
397        // make sure the current state is still correct
398        /* paranoid */ verify(src->state == Ready);
399        src->corctx_flag = true;
400
401        // context switch to specified coroutine
402        verify( dst->context.SP );
403        __cfactx_switch( &src->context, &dst->context );
404        // when __cfactx_switch returns we are back in the src coroutine
405
406        mainThread->curr_cor = &mainThread->self_cor;
407
408        // make sure the current state has been update
409        /* paranoid */ verify(src->state == Active);
410
411        /* paranoid */ verify( ! __preemption_enabled() );
412}
413
414// KERNEL_ONLY
415static void __kernel_last_resume( processor * this ) {
416        $coroutine * src = &mainThread->self_cor;
417        $coroutine * dst = get_coroutine(this->runner);
418
419        /* paranoid */ verify( ! __preemption_enabled() );
420        /* paranoid */ verify( dst->starter == src );
421        /* paranoid */ verify( dst->context.SP );
422
423        // SKULLDUGGERY in debug the processors check that the
424        // stack is still within the limit of the stack limits after running a thread.
425        // that check doesn't make sense if we context switch to the processor using the
426        // coroutine semantics. Since this is a special case, use the current context
427        // info to populate these fields.
428        __cfaabi_dbg_debug_do(
429                __stack_context_t ctx;
430                CtxGet( ctx );
431                mainThread->context.SP = ctx.SP;
432                mainThread->context.FP = ctx.FP;
433        )
434
435        // context switch to the processor
436        __cfactx_switch( &src->context, &dst->context );
437}
438
439
440//=============================================================================================
441// Kernel Object Constructors logic
442//=============================================================================================
443//-----------------------------------------------------------------------------
444// Main thread construction
445static void ?{}( $coroutine & this, current_stack_info_t * info) with( this ) {
446        stack.storage = info->storage;
447        with(*stack.storage) {
448                limit     = info->limit;
449                base      = info->base;
450        }
451        __attribute__((may_alias)) intptr_t * istorage = (intptr_t*) &stack.storage;
452        *istorage |= 0x1;
453        name = "Main Thread";
454        state = Start;
455        starter = 0p;
456        last = 0p;
457        cancellation = 0p;
458}
459
460static void ?{}( $thread & this, current_stack_info_t * info) with( this ) {
461        ticket = TICKET_RUNNING;
462        state = Start;
463        self_cor{ info };
464        curr_cor = &self_cor;
465        curr_cluster = mainCluster;
466        self_mon.owner = &this;
467        self_mon.recursion = 1;
468        self_mon_p = &self_mon;
469        link.next = 0p;
470        link.ts   = 0;
471        preferred = -1u;
472        last_proc = 0p;
473        #if defined( __CFA_WITH_VERIFY__ )
474                canary = 0x0D15EA5E0D15EA5Ep;
475        #endif
476
477        node.next = 0p;
478        node.prev = 0p;
479        doregister(curr_cluster, this);
480
481        monitors{ &self_mon_p, 1, (fptr_t)0 };
482}
483
484//-----------------------------------------------------------------------------
485// Processor
486// Construct the processor context of non-main processors
487static void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info) {
488        (this.__cor){ info };
489        this.proc = proc;
490}
491
492static void init(processor & this, const char name[], cluster & _cltr, $thread * initT) with( this ) {
493        this.name = name;
494        this.cltr = &_cltr;
495        this.rdq.its = 0;
496        this.rdq.itr = 0;
497        this.rdq.id  = -1u;
498        this.rdq.target = -1u;
499        this.rdq.cutoff = 0ull;
500        do_terminate = false;
501        preemption_alarm = 0p;
502        pending_preemption = false;
503
504        this.io.ctx = 0p;
505        this.io.pending = false;
506        this.io.dirty   = false;
507
508        this.init.thrd = initT;
509
510        this.local_data = 0p;
511
512        this.idle = eventfd(0, 0);
513        if (idle < 0) {
514                abort("KERNEL ERROR: PROCESSOR EVENTFD - %s\n", strerror(errno));
515        }
516
517        #if !defined(__CFA_NO_STATISTICS__)
518                print_stats = 0;
519                print_halts = false;
520        #endif
521
522        __cfadbg_print_safe(runtime_core, "Kernel : core %p created\n", &this);
523}
524
525// Not a ctor, it just preps the destruction but should not destroy members
526static void deinit(processor & this) {
527        close(this.idle);
528}
529
530void ?{}(processor & this, const char name[], cluster & _cltr, $thread * initT) {
531        ( this.terminated ){};
532        ( this.runner ){};
533
534        disable_interrupts();
535                init( this, name, _cltr, initT );
536        enable_interrupts();
537
538        __cfadbg_print_safe(runtime_core, "Kernel : Starting core %p\n", &this);
539
540        this.stack = __create_pthread( &this.kernel_thread, __invoke_processor, (void *)&this );
541}
542
543void ?{}(processor & this, const char name[], cluster & _cltr) {
544        (this){name, _cltr, 0p};
545}
546
547extern size_t __page_size;
548void ^?{}(processor & this) with( this ){
549        if( ! __atomic_load_n(&do_terminate, __ATOMIC_ACQUIRE) ) {
550                __cfadbg_print_safe(runtime_core, "Kernel : core %p signaling termination\n", &this);
551
552                __atomic_store_n(&do_terminate, true, __ATOMIC_RELAXED);
553                __wake_proc( &this );
554
555                wait( terminated );
556                /* paranoid */ verify( active_processor() != &this);
557        }
558
559        __destroy_pthread( kernel_thread, this.stack, 0p );
560
561        disable_interrupts();
562                deinit( this );
563        enable_interrupts();
564}
565
566//-----------------------------------------------------------------------------
567// Cluster
568static void ?{}(__cluster_proc_list & this) {
569        this.lock  = 0;
570        this.idle  = 0;
571        this.total = 0;
572}
573
574void ?{}(cluster & this, const char name[], Duration preemption_rate, unsigned num_io, const io_context_params & io_params) with( this ) {
575        this.name = name;
576        this.preemption_rate = preemption_rate;
577        ready_queue{};
578
579        #if !defined(__CFA_NO_STATISTICS__)
580                print_stats = 0;
581                stats = alloc();
582                __init_stats( stats );
583        #endif
584
585        threads{ __get };
586
587        io.arbiter = create();
588        io.params = io_params;
589
590        doregister(this);
591
592        // Lock the RWlock so no-one pushes/pops while we are changing the queue
593        disable_interrupts();
594        uint_fast32_t last_size = ready_mutate_lock();
595
596                // Adjust the ready queue size
597                ready_queue_grow( &this );
598
599        // Unlock the RWlock
600        ready_mutate_unlock( last_size );
601        enable_interrupts( false ); // Don't poll, could be in main cluster
602}
603
604void ^?{}(cluster & this) {
605        destroy(this.io.arbiter);
606
607        // Lock the RWlock so no-one pushes/pops while we are changing the queue
608        disable_interrupts();
609        uint_fast32_t last_size = ready_mutate_lock();
610
611                // Adjust the ready queue size
612                ready_queue_shrink( &this );
613
614        // Unlock the RWlock
615        ready_mutate_unlock( last_size );
616        enable_interrupts( false ); // Don't poll, could be in main cluster
617
618        #if !defined(__CFA_NO_STATISTICS__)
619                if( 0 != this.print_stats ) {
620                        __print_stats( this.stats, this.print_stats, "Cluster", this.name, (void*)&this );
621                }
622                #if defined(CFA_STATS_ARRAY)
623                        __flush_stat( this.stats, "Cluster", &this );
624                #endif
625                free( this.stats );
626        #endif
627
628        unregister(this);
629}
630
631//=============================================================================================
632// Miscellaneous Initialization
633//=============================================================================================
634//-----------------------------------------------------------------------------
635// Global Queues
636static void doregister( cluster     & cltr ) {
637        lock      ( __cfa_dbg_global_clusters.lock __cfaabi_dbg_ctx2);
638        push_front( __cfa_dbg_global_clusters.list, cltr );
639        unlock    ( __cfa_dbg_global_clusters.lock );
640}
641
642static void unregister( cluster     & cltr ) {
643        lock  ( __cfa_dbg_global_clusters.lock __cfaabi_dbg_ctx2);
644        remove( __cfa_dbg_global_clusters.list, cltr );
645        unlock( __cfa_dbg_global_clusters.lock );
646}
647
648void doregister( cluster * cltr, $thread & thrd ) {
649        lock      (cltr->thread_list_lock __cfaabi_dbg_ctx2);
650        cltr->nthreads += 1;
651        push_front(cltr->threads, thrd);
652        unlock    (cltr->thread_list_lock);
653}
654
655void unregister( cluster * cltr, $thread & thrd ) {
656        lock  (cltr->thread_list_lock __cfaabi_dbg_ctx2);
657        remove(cltr->threads, thrd );
658        cltr->nthreads -= 1;
659        unlock(cltr->thread_list_lock);
660}
661
662static void register_tls( processor * this ) {
663        // Register and Lock the RWlock so no-one pushes/pops while we are changing the queue
664        uint_fast32_t last_size;
665        [this->unique_id, last_size] = ready_mutate_register();
666
667                this->cltr->procs.total += 1u;
668                insert_last(this->cltr->procs.actives, *this);
669
670                // Adjust the ready queue size
671                ready_queue_grow( this->cltr );
672
673        // Unlock the RWlock
674        ready_mutate_unlock( last_size );
675}
676
677
678static void unregister_tls( processor * this ) {
679        // Lock the RWlock so no-one pushes/pops while we are changing the queue
680        uint_fast32_t last_size = ready_mutate_lock();
681                this->cltr->procs.total -= 1u;
682                remove(*this);
683
684                // clear the cluster so nothing gets pushed to local queues
685                cluster * cltr = this->cltr;
686                this->cltr = 0p;
687
688                // Adjust the ready queue size
689                ready_queue_shrink( cltr );
690
691        // Unlock the RWlock and unregister: we don't need the read_lock any more
692        ready_mutate_unregister( this->unique_id, last_size );
693}
694
695static void check( int ret, const char func[] ) {
696        if ( ret ) {                                                                            // pthread routines return errno values
697                abort( "%s : internal error, error(%d) %s.", func, ret, strerror( ret ) );
698        } // if
699} // Abort
700
701void * __create_pthread( pthread_t * pthread, void * (*start)(void *), void * arg ) {
702        pthread_attr_t attr;
703
704        check( pthread_attr_init( &attr ), "pthread_attr_init" ); // initialize attribute
705
706        size_t stacksize;
707        // default stack size, normally defined by shell limit
708        check( pthread_attr_getstacksize( &attr, &stacksize ), "pthread_attr_getstacksize" );
709        assert( stacksize >= PTHREAD_STACK_MIN );
710
711        void * stack;
712        #if CFA_PROCESSOR_USE_MMAP
713                stacksize = ceiling( stacksize, __page_size ) + __page_size;
714                stack = mmap(0p, stacksize, __map_prot, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
715                if(stack == ((void*)-1)) {
716                        abort( "pthread stack creation : internal error, mmap failure, error(%d) %s.", errno, strerror( errno ) );
717                }
718                if ( mprotect( stack, __page_size, PROT_NONE ) == -1 ) {
719                        abort( "pthread stack creation : internal error, mprotect failure, error(%d) %s.", errno, strerror( errno ) );
720                } // if
721        #else
722                __cfaabi_dbg_debug_do(
723                        stack = memalign( __page_size, stacksize + __page_size );
724                        // pthread has no mechanism to create the guard page in user supplied stack.
725                        if ( mprotect( stack, __page_size, PROT_NONE ) == -1 ) {
726                                abort( "mprotect : internal error, mprotect failure, error(%d) %s.", errno, strerror( errno ) );
727                        } // if
728                );
729                __cfaabi_dbg_no_debug_do(
730                        stack = malloc( stacksize );
731                );
732        #endif
733
734
735        check( pthread_attr_setstack( &attr, stack, stacksize ), "pthread_attr_setstack" );
736
737        check( pthread_create( pthread, &attr, start, arg ), "pthread_create" );
738        return stack;
739}
740
741void __destroy_pthread( pthread_t pthread, void * stack, void ** retval ) {
742        int err = pthread_join( pthread, retval );
743        if( err != 0 ) abort("KERNEL ERROR: joining pthread %p caused error %s\n", (void*)pthread, strerror(err));
744
745        #if CFA_PROCESSOR_USE_MMAP
746                pthread_attr_t attr;
747
748                check( pthread_attr_init( &attr ), "pthread_attr_init" ); // initialize attribute
749
750                size_t stacksize;
751                // default stack size, normally defined by shell limit
752                check( pthread_attr_getstacksize( &attr, &stacksize ), "pthread_attr_getstacksize" );
753                assert( stacksize >= PTHREAD_STACK_MIN );
754                stacksize += __page_size;
755
756                if(munmap(stack, stacksize) == -1) {
757                        abort( "pthread stack destruction : internal error, munmap failure, error(%d) %s.", errno, strerror( errno ) );
758                }
759        #else
760                __cfaabi_dbg_debug_do(
761                        // pthread has no mechanism to create the guard page in user supplied stack.
762                        if ( mprotect( stack, __page_size, __map_prot ) == -1 ) {
763                                abort( "mprotect : internal error, mprotect failure, error(%d) %s.", errno, strerror( errno ) );
764                        } // if
765                );
766                free( stack );
767        #endif
768}
769
770#if defined(__CFA_WITH_VERIFY__)
771static bool verify_fwd_bck_rng(void) {
772        __cfaabi_tls.ready_rng.fwd_seed = 25214903917_l64u * (rdtscl() ^ (uintptr_t)&verify_fwd_bck_rng);
773
774        unsigned values[10];
775        for(i; 10) {
776                values[i] = __tls_rand_fwd();
777        }
778
779        __tls_rand_advance_bck();
780
781        for ( i; 9 -~= 0 ) {
782                if(values[i] != __tls_rand_bck()) {
783                        return false;
784                }
785        }
786
787        return true;
788}
789#endif
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