source: libcfa/src/concurrency/kernel/startup.cfa @ e873838

arm-ehjacob/cs343-translationnew-ast-unique-expr
Last change on this file since e873838 was e873838, checked in by Thierry Delisle <tdelisle@…>, 13 months ago

Removed unpark and added support for unpark from the kernel (removing the distinction between the two

  • Property mode set to 100644
File size: 22.0 KB
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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/mman.h>     // mprotect
25      #include <sys/resource.h> // getrlimit
26}
27
28// CFA Includes
29#include "kernel_private.hfa"
30#include "startup.hfa"          // STARTUP_PRIORITY_XXX
31
32//-----------------------------------------------------------------------------
33// Some assembly required
34#if defined( __i386 )
35        #define CtxGet( ctx ) __asm__ volatile ( \
36                "movl %%esp,%0\n" \
37                "movl %%ebp,%1\n" \
38                : "=rm" (ctx.SP), \
39                  "=rm" (ctx.FP) \
40        )
41#elif defined( __x86_64 )
42        #define CtxGet( ctx ) __asm__ volatile ( \
43                "movq %%rsp,%0\n" \
44                "movq %%rbp,%1\n" \
45                : "=rm" (ctx.SP), \
46                  "=rm" (ctx.FP) \
47        )
48#elif defined( __aarch64__ )
49        #define CtxGet( ctx ) __asm__ volatile ( \
50                "mov %0, sp\n" \
51                "mov %1, fp\n" \
52                : "=rm" (ctx.SP), \
53                  "=rm" (ctx.FP) \
54        )
55#else
56        #error unknown hardware architecture
57#endif
58
59//-----------------------------------------------------------------------------
60// Start and stop routine for the kernel, declared first to make sure they run first
61static void __kernel_startup (void) __attribute__(( constructor( STARTUP_PRIORITY_KERNEL ) ));
62static void __kernel_shutdown(void) __attribute__(( destructor ( STARTUP_PRIORITY_KERNEL ) ));
63
64//-----------------------------------------------------------------------------
65// Static Forward Declarations
66struct current_stack_info_t;
67
68static void * __invoke_processor(void * arg);
69static void __kernel_first_resume( processor * this );
70static void __kernel_last_resume ( processor * this );
71static void init(processor & this, const char name[], cluster & _cltr);
72static void deinit(processor & this);
73static void doregister( struct cluster & cltr );
74static void unregister( struct cluster & cltr );
75static void ?{}( $coroutine & this, current_stack_info_t * info);
76static void ?{}( $thread & this, current_stack_info_t * info);
77static void ?{}(processorCtx_t & this) {}
78static void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info);
79
80#if defined(__CFA_WITH_VERIFY__)
81        static bool verify_fwd_bck_rng(void);
82#endif
83
84//-----------------------------------------------------------------------------
85// Forward Declarations for other modules
86extern void __kernel_alarm_startup(void);
87extern void __kernel_alarm_shutdown(void);
88extern void __kernel_io_startup (void);
89extern void __kernel_io_shutdown(void);
90
91//-----------------------------------------------------------------------------
92// Other Forward Declarations
93extern void __wake_proc(processor *);
94
95//-----------------------------------------------------------------------------
96// Kernel storage
97KERNEL_STORAGE(cluster,              mainCluster);
98KERNEL_STORAGE(processor,            mainProcessor);
99KERNEL_STORAGE($thread,              mainThread);
100KERNEL_STORAGE(__stack_t,            mainThreadCtx);
101KERNEL_STORAGE(io_context,           mainPollerThread);
102KERNEL_STORAGE(__scheduler_RWLock_t, __scheduler_lock);
103#if !defined(__CFA_NO_STATISTICS__)
104KERNEL_STORAGE(__stats_t, mainProcStats);
105#endif
106
107cluster              * mainCluster;
108processor            * mainProcessor;
109$thread              * mainThread;
110__scheduler_RWLock_t * __scheduler_lock;
111
112extern "C" {
113        struct { __dllist_t(cluster) list; __spinlock_t lock; } __cfa_dbg_global_clusters;
114}
115
116size_t __page_size = 0;
117
118//-----------------------------------------------------------------------------
119// Global state
120thread_local struct KernelThreadData kernelTLS __attribute__ ((tls_model ( "initial-exec" ))) @= {
121        NULL,                                                                                           // cannot use 0p
122        NULL,
123        NULL,
124        NULL,
125        { 1, false, false },
126};
127
128//-----------------------------------------------------------------------------
129// Struct to steal stack
130struct current_stack_info_t {
131        __stack_t * storage;  // pointer to stack object
132        void * base;          // base of stack
133        void * limit;         // stack grows towards stack limit
134        void * context;       // address of cfa_context_t
135};
136
137void ?{}( current_stack_info_t & this ) {
138        __stack_context_t ctx;
139        CtxGet( ctx );
140        this.base = ctx.FP;
141
142        rlimit r;
143        getrlimit( RLIMIT_STACK, &r);
144        size_t size = r.rlim_cur;
145
146        this.limit = (void *)(((intptr_t)this.base) - size);
147        this.context = &storage_mainThreadCtx;
148}
149
150
151
152//=============================================================================================
153// Kernel Setup logic
154//=============================================================================================
155//-----------------------------------------------------------------------------
156// Kernel boot procedures
157static void __kernel_startup(void) {
158        verify( ! kernelTLS.preemption_state.enabled );
159        __cfadbg_print_safe(runtime_core, "Kernel : Starting\n");
160
161        __page_size = sysconf( _SC_PAGESIZE );
162
163        __cfa_dbg_global_clusters.list{ __get };
164        __cfa_dbg_global_clusters.lock{};
165
166        /* paranoid */ verify( verify_fwd_bck_rng() );
167
168        // Initialize the global scheduler lock
169        __scheduler_lock = (__scheduler_RWLock_t*)&storage___scheduler_lock;
170        (*__scheduler_lock){};
171
172        // Initialize the main cluster
173        mainCluster = (cluster *)&storage_mainCluster;
174        (*mainCluster){"Main Cluster", 0};
175
176        __cfadbg_print_safe(runtime_core, "Kernel : Main cluster ready\n");
177
178        // Start by initializing the main thread
179        // SKULLDUGGERY: the mainThread steals the process main thread
180        // which will then be scheduled by the mainProcessor normally
181        mainThread = ($thread *)&storage_mainThread;
182        current_stack_info_t info;
183        info.storage = (__stack_t*)&storage_mainThreadCtx;
184        (*mainThread){ &info };
185
186        __cfadbg_print_safe(runtime_core, "Kernel : Main thread ready\n");
187
188
189
190        // Construct the processor context of the main processor
191        void ?{}(processorCtx_t & this, processor * proc) {
192                (this.__cor){ "Processor" };
193                this.__cor.starter = 0p;
194                this.proc = proc;
195        }
196
197        void ?{}(processor & this) with( this ) {
198                ( this.idle ){};
199                ( this.terminated ){ 0 };
200                ( this.runner ){};
201                init( this, "Main Processor", *mainCluster );
202                kernel_thread = pthread_self();
203
204                runner{ &this };
205                __cfadbg_print_safe(runtime_core, "Kernel : constructed main processor context %p\n", &runner);
206        }
207
208        // Initialize the main processor and the main processor ctx
209        // (the coroutine that contains the processing control flow)
210        mainProcessor = (processor *)&storage_mainProcessor;
211        (*mainProcessor){};
212
213        //initialize the global state variables
214        kernelTLS.this_processor = mainProcessor;
215        kernelTLS.this_proc_id   = (__processor_id_t*)mainProcessor;
216        kernelTLS.this_thread    = mainThread;
217
218        #if !defined( __CFA_NO_STATISTICS__ )
219                kernelTLS.this_stats = (__stats_t *)& storage_mainProcStats;
220                __init_stats( kernelTLS.this_stats );
221        #endif
222
223        // Enable preemption
224        __kernel_alarm_startup();
225
226        // Start IO
227        __kernel_io_startup();
228
229        // Add the main thread to the ready queue
230        // once resume is called on mainProcessor->runner the mainThread needs to be scheduled like any normal thread
231        __schedule_thread(mainThread);
232
233        // SKULLDUGGERY: Force a context switch to the main processor to set the main thread's context to the current UNIX
234        // context. Hence, the main thread does not begin through __cfactx_invoke_thread, like all other threads. The trick here is that
235        // mainThread is on the ready queue when this call is made.
236        __kernel_first_resume( kernelTLS.this_processor );
237
238
239        // THE SYSTEM IS NOW COMPLETELY RUNNING
240
241
242        // SKULLDUGGERY: The constructor for the mainCluster will call alloc with a dimension of 0
243        // malloc *can* return a non-null value, we should free it if that is the case
244        free( mainCluster->io.ctxs );
245
246        // Now that the system is up, finish creating systems that need threading
247        mainCluster->io.ctxs = (io_context *)&storage_mainPollerThread;
248        mainCluster->io.cnt  = 1;
249        (*mainCluster->io.ctxs){ *mainCluster };
250
251        __cfadbg_print_safe(runtime_core, "Kernel : Started\n--------------------------------------------------\n\n");
252
253        verify( ! kernelTLS.preemption_state.enabled );
254        enable_interrupts( __cfaabi_dbg_ctx );
255        verify( TL_GET( preemption_state.enabled ) );
256}
257
258static void __kernel_shutdown(void) {
259        //Before we start shutting things down, wait for systems that need threading to shutdown
260        ^(*mainCluster->io.ctxs){};
261        mainCluster->io.cnt  = 0;
262        mainCluster->io.ctxs = 0p;
263
264        /* paranoid */ verify( TL_GET( preemption_state.enabled ) );
265        disable_interrupts();
266        /* paranoid */ verify( ! kernelTLS.preemption_state.enabled );
267
268        __cfadbg_print_safe(runtime_core, "\n--------------------------------------------------\nKernel : Shutting down\n");
269
270        // SKULLDUGGERY: Notify the mainProcessor it needs to terminates.
271        // When its coroutine terminates, it return control to the mainThread
272        // which is currently here
273        __atomic_store_n(&mainProcessor->do_terminate, true, __ATOMIC_RELEASE);
274        __kernel_last_resume( kernelTLS.this_processor );
275        mainThread->self_cor.state = Halted;
276
277        // THE SYSTEM IS NOW COMPLETELY STOPPED
278
279        // Disable preemption
280        __kernel_alarm_shutdown();
281
282        // Stop IO
283        __kernel_io_shutdown();
284
285        // Destroy the main processor and its context in reverse order of construction
286        // These were manually constructed so we need manually destroy them
287        void ^?{}(processor & this) with( this ){
288                deinit( this );
289
290                /* paranoid */ verify( this.do_terminate == true );
291                __cfaabi_dbg_print_safe("Kernel : destroyed main processor context %p\n", &runner);
292        }
293
294        ^(*mainProcessor){};
295
296        // Final step, destroy the main thread since it is no longer needed
297
298        // Since we provided a stack to this taxk it will not destroy anything
299        /* paranoid */ verify(mainThread->self_cor.stack.storage == (__stack_t*)(((uintptr_t)&storage_mainThreadCtx)| 0x1));
300        ^(*mainThread){};
301
302        ^(*mainCluster){};
303
304        ^(*__scheduler_lock){};
305
306        ^(__cfa_dbg_global_clusters.list){};
307        ^(__cfa_dbg_global_clusters.lock){};
308
309        __cfadbg_print_safe(runtime_core, "Kernel : Shutdown complete\n");
310}
311
312//=============================================================================================
313// Kernel Initial Scheduling logic
314//=============================================================================================
315
316// Context invoker for processors
317// This is the entry point for processors (kernel threads) *except* for the main processor
318// It effectively constructs a coroutine by stealing the pthread stack
319static void * __invoke_processor(void * arg) {
320        #if !defined( __CFA_NO_STATISTICS__ )
321                __stats_t local_stats;
322                __init_stats( &local_stats );
323                kernelTLS.this_stats = &local_stats;
324        #endif
325
326        processor * proc = (processor *) arg;
327        kernelTLS.this_processor = proc;
328        kernelTLS.this_proc_id   = (__processor_id_t*)proc;
329        kernelTLS.this_thread    = 0p;
330        kernelTLS.preemption_state.[enabled, disable_count] = [false, 1];
331        // SKULLDUGGERY: We want to create a context for the processor coroutine
332        // which is needed for the 2-step context switch. However, there is no reason
333        // to waste the perfectly valid stack create by pthread.
334        current_stack_info_t info;
335        __stack_t ctx;
336        info.storage = &ctx;
337        (proc->runner){ proc, &info };
338
339        __cfaabi_dbg_print_safe("Coroutine : created stack %p\n", get_coroutine(proc->runner)->stack.storage);
340
341        //Set global state
342        kernelTLS.this_thread = 0p;
343
344        //We now have a proper context from which to schedule threads
345        __cfadbg_print_safe(runtime_core, "Kernel : core %p created (%p, %p)\n", proc, &proc->runner, &ctx);
346
347        // SKULLDUGGERY: Since the coroutine doesn't have its own stack, we can't
348        // resume it to start it like it normally would, it will just context switch
349        // back to here. Instead directly call the main since we already are on the
350        // appropriate stack.
351        get_coroutine(proc->runner)->state = Active;
352        main( proc->runner );
353        get_coroutine(proc->runner)->state = Halted;
354
355        // Main routine of the core returned, the core is now fully terminated
356        __cfadbg_print_safe(runtime_core, "Kernel : core %p main ended (%p)\n", proc, &proc->runner);
357
358        #if !defined(__CFA_NO_STATISTICS__)
359                __tally_stats(proc->cltr->stats, &local_stats);
360                if( 0 != proc->print_stats ) {
361                        __print_stats( &local_stats, proc->print_stats, true, proc->name, (void*)proc );
362                }
363        #endif
364
365        return 0p;
366}
367
368static void __kernel_first_resume( processor * this ) {
369        $thread * src = mainThread;
370        $coroutine * dst = get_coroutine(this->runner);
371
372        verify( ! kernelTLS.preemption_state.enabled );
373
374        kernelTLS.this_thread->curr_cor = dst;
375        __stack_prepare( &dst->stack, 65000 );
376        __cfactx_start(main, dst, this->runner, __cfactx_invoke_coroutine);
377
378        verify( ! kernelTLS.preemption_state.enabled );
379
380        dst->last = &src->self_cor;
381        dst->starter = dst->starter ? dst->starter : &src->self_cor;
382
383        // make sure the current state is still correct
384        /* paranoid */ verify(src->state == Ready);
385
386        // context switch to specified coroutine
387        verify( dst->context.SP );
388        __cfactx_switch( &src->context, &dst->context );
389        // when __cfactx_switch returns we are back in the src coroutine
390
391        mainThread->curr_cor = &mainThread->self_cor;
392
393        // make sure the current state has been update
394        /* paranoid */ verify(src->state == Active);
395
396        verify( ! kernelTLS.preemption_state.enabled );
397}
398
399// KERNEL_ONLY
400static void __kernel_last_resume( processor * this ) {
401        $coroutine * src = &mainThread->self_cor;
402        $coroutine * dst = get_coroutine(this->runner);
403
404        verify( ! kernelTLS.preemption_state.enabled );
405        verify( dst->starter == src );
406        verify( dst->context.SP );
407
408        // SKULLDUGGERY in debug the processors check that the
409        // stack is still within the limit of the stack limits after running a thread.
410        // that check doesn't make sense if we context switch to the processor using the
411        // coroutine semantics. Since this is a special case, use the current context
412        // info to populate these fields.
413        __cfaabi_dbg_debug_do(
414                __stack_context_t ctx;
415                CtxGet( ctx );
416                mainThread->context.SP = ctx.SP;
417                mainThread->context.FP = ctx.FP;
418        )
419
420        // context switch to the processor
421        __cfactx_switch( &src->context, &dst->context );
422}
423
424
425//=============================================================================================
426// Kernel Object Constructors logic
427//=============================================================================================
428//-----------------------------------------------------------------------------
429// Main thread construction
430static void ?{}( $coroutine & this, current_stack_info_t * info) with( this ) {
431        stack.storage = info->storage;
432        with(*stack.storage) {
433                limit     = info->limit;
434                base      = info->base;
435        }
436        __attribute__((may_alias)) intptr_t * istorage = (intptr_t*) &stack.storage;
437        *istorage |= 0x1;
438        name = "Main Thread";
439        state = Start;
440        starter = 0p;
441        last = 0p;
442        cancellation = 0p;
443}
444
445static void ?{}( $thread & this, current_stack_info_t * info) with( this ) {
446        ticket = TICKET_RUNNING;
447        state = Start;
448        self_cor{ info };
449        curr_cor = &self_cor;
450        curr_cluster = mainCluster;
451        self_mon.owner = &this;
452        self_mon.recursion = 1;
453        self_mon_p = &self_mon;
454        link.next = 0p;
455        link.prev = 0p;
456        #if defined( __CFA_WITH_VERIFY__ )
457                canary = 0x0D15EA5E0D15EA5E;
458        #endif
459
460        node.next = 0p;
461        node.prev = 0p;
462        doregister(curr_cluster, this);
463
464        monitors{ &self_mon_p, 1, (fptr_t)0 };
465}
466
467//-----------------------------------------------------------------------------
468// Processor
469// Construct the processor context of non-main processors
470static void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info) {
471        (this.__cor){ info };
472        this.proc = proc;
473}
474
475static void init(processor & this, const char name[], cluster & _cltr) with( this ) {
476        this.name = name;
477        this.cltr = &_cltr;
478        full_proc = true;
479        do_terminate = false;
480        preemption_alarm = 0p;
481        pending_preemption = false;
482
483        #if !defined(__CFA_NO_STATISTICS__)
484                print_stats = 0;
485                print_halts = false;
486        #endif
487
488        lock( this.cltr->idles );
489                int target = this.cltr->idles.total += 1u;
490        unlock( this.cltr->idles );
491
492        id = doregister((__processor_id_t*)&this);
493
494        // Lock the RWlock so no-one pushes/pops while we are changing the queue
495        uint_fast32_t last_size = ready_mutate_lock();
496
497                // Adjust the ready queue size
498                ready_queue_grow( cltr, target );
499
500        // Unlock the RWlock
501        ready_mutate_unlock( last_size );
502
503        __cfadbg_print_safe(runtime_core, "Kernel : core %p created\n", &this);
504}
505
506// Not a ctor, it just preps the destruction but should not destroy members
507static void deinit(processor & this) {
508        lock( this.cltr->idles );
509                int target = this.cltr->idles.total -= 1u;
510        unlock( this.cltr->idles );
511
512        // Lock the RWlock so no-one pushes/pops while we are changing the queue
513        uint_fast32_t last_size = ready_mutate_lock();
514
515                // Adjust the ready queue size
516                ready_queue_shrink( this.cltr, target );
517
518        // Unlock the RWlock
519        ready_mutate_unlock( last_size );
520
521        // Finally we don't need the read_lock any more
522        unregister((__processor_id_t*)&this);
523}
524
525void ?{}(processor & this, const char name[], cluster & _cltr) {
526        ( this.idle ){};
527        ( this.terminated ){ 0 };
528        ( this.runner ){};
529
530        disable_interrupts();
531                init( this, name, _cltr );
532        enable_interrupts( __cfaabi_dbg_ctx );
533
534        __cfadbg_print_safe(runtime_core, "Kernel : Starting core %p\n", &this);
535
536        this.stack = __create_pthread( &this.kernel_thread, __invoke_processor, (void *)&this );
537
538}
539
540void ^?{}(processor & this) with( this ){
541        if( ! __atomic_load_n(&do_terminate, __ATOMIC_ACQUIRE) ) {
542                __cfadbg_print_safe(runtime_core, "Kernel : core %p signaling termination\n", &this);
543
544                __atomic_store_n(&do_terminate, true, __ATOMIC_RELAXED);
545                __wake_proc( &this );
546
547                P( terminated );
548                verify( kernelTLS.this_processor != &this);
549        }
550
551        int err = pthread_join( kernel_thread, 0p );
552        if( err != 0 ) abort("KERNEL ERROR: joining processor %p caused error %s\n", &this, strerror(err));
553
554        free( this.stack );
555
556        disable_interrupts();
557                deinit( this );
558        enable_interrupts( __cfaabi_dbg_ctx );
559}
560
561//-----------------------------------------------------------------------------
562// Cluster
563static void ?{}(__cluster_idles & this) {
564        this.lock  = 0;
565        this.idle  = 0;
566        this.total = 0;
567        (this.list){};
568}
569
570void ?{}(cluster & this, const char name[], Duration preemption_rate, unsigned num_io, const io_context_params & io_params) with( this ) {
571        this.name = name;
572        this.preemption_rate = preemption_rate;
573        ready_queue{};
574
575        #if !defined(__CFA_NO_STATISTICS__)
576                print_stats = 0;
577                stats = alloc();
578                __init_stats( stats );
579        #endif
580
581        threads{ __get };
582
583        doregister(this);
584
585        // Lock the RWlock so no-one pushes/pops while we are changing the queue
586        disable_interrupts();
587        uint_fast32_t last_size = ready_mutate_lock();
588
589                // Adjust the ready queue size
590                ready_queue_grow( &this, 0 );
591
592        // Unlock the RWlock
593        ready_mutate_unlock( last_size );
594        enable_interrupts_noPoll(); // Don't poll, could be in main cluster
595
596
597        this.io.cnt  = num_io;
598        this.io.ctxs = aalloc(num_io);
599        for(i; this.io.cnt) {
600                (this.io.ctxs[i]){ this, io_params };
601        }
602}
603
604void ^?{}(cluster & this) {
605        for(i; this.io.cnt) {
606                ^(this.io.ctxs[i]){ true };
607        }
608        free(this.io.ctxs);
609
610        // Lock the RWlock so no-one pushes/pops while we are changing the queue
611        disable_interrupts();
612        uint_fast32_t last_size = ready_mutate_lock();
613
614                // Adjust the ready queue size
615                ready_queue_shrink( &this, 0 );
616
617        // Unlock the RWlock
618        ready_mutate_unlock( last_size );
619        enable_interrupts_noPoll(); // Don't poll, could be in main cluster
620
621        #if !defined(__CFA_NO_STATISTICS__)
622                if( 0 != this.print_stats ) {
623                        __print_stats( this.stats, this.print_stats, true, this.name, (void*)&this );
624                }
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 check( int ret, const char func[] ) {
663        if ( ret ) {                                                                            // pthread routines return errno values
664                abort( "%s : internal error, error(%d) %s.", func, ret, strerror( ret ) );
665        } // if
666} // Abort
667
668void * __create_pthread( pthread_t * pthread, void * (*start)(void *), void * arg ) {
669        pthread_attr_t attr;
670
671        check( pthread_attr_init( &attr ), "pthread_attr_init" ); // initialize attribute
672
673        size_t stacksize;
674        // default stack size, normally defined by shell limit
675        check( pthread_attr_getstacksize( &attr, &stacksize ), "pthread_attr_getstacksize" );
676        assert( stacksize >= PTHREAD_STACK_MIN );
677
678        void * stack;
679        __cfaabi_dbg_debug_do(
680                stack = memalign( __page_size, stacksize + __page_size );
681                // pthread has no mechanism to create the guard page in user supplied stack.
682                if ( mprotect( stack, __page_size, PROT_NONE ) == -1 ) {
683                        abort( "mprotect : internal error, mprotect failure, error(%d) %s.", errno, strerror( errno ) );
684                } // if
685        );
686        __cfaabi_dbg_no_debug_do(
687                stack = malloc( stacksize );
688        );
689
690        check( pthread_attr_setstack( &attr, stack, stacksize ), "pthread_attr_setstack" );
691
692        check( pthread_create( pthread, &attr, start, arg ), "pthread_create" );
693        return stack;
694}
695
696#if defined(__CFA_WITH_VERIFY__)
697static bool verify_fwd_bck_rng(void) {
698        kernelTLS.ready_rng.fwd_seed = 25214903917_l64u * (rdtscl() ^ (uintptr_t)&verify_fwd_bck_rng);
699
700        unsigned values[10];
701        for(i; 10) {
702                values[i] = __tls_rand_fwd();
703        }
704
705        __tls_rand_advance_bck();
706
707        for ( i; 9 -~= 0 ) {
708                if(values[i] != __tls_rand_bck()) {
709                        return false;
710                }
711        }
712
713        return true;
714}
715#endif
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