source: libcfa/src/concurrency/kernel/startup.cfa @ b4b63e8

arm-ehjacob/cs343-translationnew-ast-unique-expr
Last change on this file since b4b63e8 was b4b63e8, checked in by Thierry Delisle <tdelisle@…>, 14 months ago

Fixed missing changes to park/unpark.
Added canary to threads to check when the thread was destroyed

  • Property mode set to 100644
File size: 21.9 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// 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        { 1, false, false },
125};
126
127//-----------------------------------------------------------------------------
128// Struct to steal stack
129struct current_stack_info_t {
130        __stack_t * storage;  // pointer to stack object
131        void * base;          // base of stack
132        void * limit;         // stack grows towards stack limit
133        void * context;       // address of cfa_context_t
134};
135
136void ?{}( current_stack_info_t & this ) {
137        __stack_context_t ctx;
138        CtxGet( ctx );
139        this.base = ctx.FP;
140
141        rlimit r;
142        getrlimit( RLIMIT_STACK, &r);
143        size_t size = r.rlim_cur;
144
145        this.limit = (void *)(((intptr_t)this.base) - size);
146        this.context = &storage_mainThreadCtx;
147}
148
149
150
151//=============================================================================================
152// Kernel Setup logic
153//=============================================================================================
154//-----------------------------------------------------------------------------
155// Kernel boot procedures
156static void __kernel_startup(void) {
157        verify( ! kernelTLS.preemption_state.enabled );
158        __cfadbg_print_safe(runtime_core, "Kernel : Starting\n");
159
160        __page_size = sysconf( _SC_PAGESIZE );
161
162        __cfa_dbg_global_clusters.list{ __get };
163        __cfa_dbg_global_clusters.lock{};
164
165        /* paranoid */ verify( verify_fwd_bck_rng() );
166
167        // Initialize the global scheduler lock
168        __scheduler_lock = (__scheduler_RWLock_t*)&storage___scheduler_lock;
169        (*__scheduler_lock){};
170
171        // Initialize the main cluster
172        mainCluster = (cluster *)&storage_mainCluster;
173        (*mainCluster){"Main Cluster", 0};
174
175        __cfadbg_print_safe(runtime_core, "Kernel : Main cluster ready\n");
176
177        // Start by initializing the main thread
178        // SKULLDUGGERY: the mainThread steals the process main thread
179        // which will then be scheduled by the mainProcessor normally
180        mainThread = ($thread *)&storage_mainThread;
181        current_stack_info_t info;
182        info.storage = (__stack_t*)&storage_mainThreadCtx;
183        (*mainThread){ &info };
184
185        __cfadbg_print_safe(runtime_core, "Kernel : Main thread ready\n");
186
187
188
189        // Construct the processor context of the main processor
190        void ?{}(processorCtx_t & this, processor * proc) {
191                (this.__cor){ "Processor" };
192                this.__cor.starter = 0p;
193                this.proc = proc;
194        }
195
196        void ?{}(processor & this) with( this ) {
197                ( this.idle ){};
198                ( this.terminated ){ 0 };
199                ( this.runner ){};
200                init( this, "Main Processor", *mainCluster );
201                kernel_thread = pthread_self();
202
203                runner{ &this };
204                __cfadbg_print_safe(runtime_core, "Kernel : constructed main processor context %p\n", &runner);
205        }
206
207        // Initialize the main processor and the main processor ctx
208        // (the coroutine that contains the processing control flow)
209        mainProcessor = (processor *)&storage_mainProcessor;
210        (*mainProcessor){};
211
212        //initialize the global state variables
213        kernelTLS.this_processor = mainProcessor;
214        kernelTLS.this_thread    = mainThread;
215
216        #if !defined( __CFA_NO_STATISTICS__ )
217                kernelTLS.this_stats = (__stats_t *)& storage_mainProcStats;
218                __init_stats( kernelTLS.this_stats );
219        #endif
220
221        // Enable preemption
222        __kernel_alarm_startup();
223
224        // Start IO
225        __kernel_io_startup();
226
227        // Add the main thread to the ready queue
228        // once resume is called on mainProcessor->runner the mainThread needs to be scheduled like any normal thread
229        __schedule_thread((__processor_id_t *)mainProcessor, mainThread);
230
231        // SKULLDUGGERY: Force a context switch to the main processor to set the main thread's context to the current UNIX
232        // context. Hence, the main thread does not begin through __cfactx_invoke_thread, like all other threads. The trick here is that
233        // mainThread is on the ready queue when this call is made.
234        __kernel_first_resume( kernelTLS.this_processor );
235
236
237        // THE SYSTEM IS NOW COMPLETELY RUNNING
238
239
240        // SKULLDUGGERY: The constructor for the mainCluster will call alloc with a dimension of 0
241        // malloc *can* return a non-null value, we should free it if that is the case
242        free( mainCluster->io.ctxs );
243
244        // Now that the system is up, finish creating systems that need threading
245        mainCluster->io.ctxs = (io_context *)&storage_mainPollerThread;
246        mainCluster->io.cnt  = 1;
247        (*mainCluster->io.ctxs){ *mainCluster };
248
249        __cfadbg_print_safe(runtime_core, "Kernel : Started\n--------------------------------------------------\n\n");
250
251        verify( ! kernelTLS.preemption_state.enabled );
252        enable_interrupts( __cfaabi_dbg_ctx );
253        verify( TL_GET( preemption_state.enabled ) );
254}
255
256static void __kernel_shutdown(void) {
257        //Before we start shutting things down, wait for systems that need threading to shutdown
258        ^(*mainCluster->io.ctxs){};
259        mainCluster->io.cnt  = 0;
260        mainCluster->io.ctxs = 0p;
261
262        /* paranoid */ verify( TL_GET( preemption_state.enabled ) );
263        disable_interrupts();
264        /* paranoid */ verify( ! kernelTLS.preemption_state.enabled );
265
266        __cfadbg_print_safe(runtime_core, "\n--------------------------------------------------\nKernel : Shutting down\n");
267
268        // SKULLDUGGERY: Notify the mainProcessor it needs to terminates.
269        // When its coroutine terminates, it return control to the mainThread
270        // which is currently here
271        __atomic_store_n(&mainProcessor->do_terminate, true, __ATOMIC_RELEASE);
272        __kernel_last_resume( kernelTLS.this_processor );
273        mainThread->self_cor.state = Halted;
274
275        // THE SYSTEM IS NOW COMPLETELY STOPPED
276
277        // Disable preemption
278        __kernel_alarm_shutdown();
279
280        // Stop IO
281        __kernel_io_shutdown();
282
283        // Destroy the main processor and its context in reverse order of construction
284        // These were manually constructed so we need manually destroy them
285        void ^?{}(processor & this) with( this ){
286                deinit( this );
287
288                /* paranoid */ verify( this.do_terminate == true );
289                __cfaabi_dbg_print_safe("Kernel : destroyed main processor context %p\n", &runner);
290        }
291
292        ^(*mainProcessor){};
293
294        // Final step, destroy the main thread since it is no longer needed
295
296        // Since we provided a stack to this taxk it will not destroy anything
297        /* paranoid */ verify(mainThread->self_cor.stack.storage == (__stack_t*)(((uintptr_t)&storage_mainThreadCtx)| 0x1));
298        ^(*mainThread){};
299
300        ^(*mainCluster){};
301
302        ^(*__scheduler_lock){};
303
304        ^(__cfa_dbg_global_clusters.list){};
305        ^(__cfa_dbg_global_clusters.lock){};
306
307        __cfadbg_print_safe(runtime_core, "Kernel : Shutdown complete\n");
308}
309
310//=============================================================================================
311// Kernel Initial Scheduling logic
312//=============================================================================================
313
314// Context invoker for processors
315// This is the entry point for processors (kernel threads) *except* for the main processor
316// It effectively constructs a coroutine by stealing the pthread stack
317static void * __invoke_processor(void * arg) {
318        #if !defined( __CFA_NO_STATISTICS__ )
319                __stats_t local_stats;
320                __init_stats( &local_stats );
321                kernelTLS.this_stats = &local_stats;
322        #endif
323
324        processor * proc = (processor *) arg;
325        kernelTLS.this_processor = proc;
326        kernelTLS.this_thread    = 0p;
327        kernelTLS.preemption_state.[enabled, disable_count] = [false, 1];
328        // SKULLDUGGERY: We want to create a context for the processor coroutine
329        // which is needed for the 2-step context switch. However, there is no reason
330        // to waste the perfectly valid stack create by pthread.
331        current_stack_info_t info;
332        __stack_t ctx;
333        info.storage = &ctx;
334        (proc->runner){ proc, &info };
335
336        __cfaabi_dbg_print_safe("Coroutine : created stack %p\n", get_coroutine(proc->runner)->stack.storage);
337
338        //Set global state
339        kernelTLS.this_thread = 0p;
340
341        //We now have a proper context from which to schedule threads
342        __cfadbg_print_safe(runtime_core, "Kernel : core %p created (%p, %p)\n", proc, &proc->runner, &ctx);
343
344        // SKULLDUGGERY: Since the coroutine doesn't have its own stack, we can't
345        // resume it to start it like it normally would, it will just context switch
346        // back to here. Instead directly call the main since we already are on the
347        // appropriate stack.
348        get_coroutine(proc->runner)->state = Active;
349        main( proc->runner );
350        get_coroutine(proc->runner)->state = Halted;
351
352        // Main routine of the core returned, the core is now fully terminated
353        __cfadbg_print_safe(runtime_core, "Kernel : core %p main ended (%p)\n", proc, &proc->runner);
354
355        #if !defined(__CFA_NO_STATISTICS__)
356                __tally_stats(proc->cltr->stats, &local_stats);
357                if( 0 != proc->print_stats ) {
358                        __print_stats( &local_stats, proc->print_stats, true, proc->name, (void*)proc );
359                }
360        #endif
361
362        return 0p;
363}
364
365static void __kernel_first_resume( processor * this ) {
366        $thread * src = mainThread;
367        $coroutine * dst = get_coroutine(this->runner);
368
369        verify( ! kernelTLS.preemption_state.enabled );
370
371        kernelTLS.this_thread->curr_cor = dst;
372        __stack_prepare( &dst->stack, 65000 );
373        __cfactx_start(main, dst, this->runner, __cfactx_invoke_coroutine);
374
375        verify( ! kernelTLS.preemption_state.enabled );
376
377        dst->last = &src->self_cor;
378        dst->starter = dst->starter ? dst->starter : &src->self_cor;
379
380        // make sure the current state is still correct
381        /* paranoid */ verify(src->state == Ready);
382
383        // context switch to specified coroutine
384        verify( dst->context.SP );
385        __cfactx_switch( &src->context, &dst->context );
386        // when __cfactx_switch returns we are back in the src coroutine
387
388        mainThread->curr_cor = &mainThread->self_cor;
389
390        // make sure the current state has been update
391        /* paranoid */ verify(src->state == Active);
392
393        verify( ! kernelTLS.preemption_state.enabled );
394}
395
396// KERNEL_ONLY
397static void __kernel_last_resume( processor * this ) {
398        $coroutine * src = &mainThread->self_cor;
399        $coroutine * dst = get_coroutine(this->runner);
400
401        verify( ! kernelTLS.preemption_state.enabled );
402        verify( dst->starter == src );
403        verify( dst->context.SP );
404
405        // SKULLDUGGERY in debug the processors check that the
406        // stack is still within the limit of the stack limits after running a thread.
407        // that check doesn't make sense if we context switch to the processor using the
408        // coroutine semantics. Since this is a special case, use the current context
409        // info to populate these fields.
410        __cfaabi_dbg_debug_do(
411                __stack_context_t ctx;
412                CtxGet( ctx );
413                mainThread->context.SP = ctx.SP;
414                mainThread->context.FP = ctx.FP;
415        )
416
417        // context switch to the processor
418        __cfactx_switch( &src->context, &dst->context );
419}
420
421
422//=============================================================================================
423// Kernel Object Constructors logic
424//=============================================================================================
425//-----------------------------------------------------------------------------
426// Main thread construction
427static void ?{}( $coroutine & this, current_stack_info_t * info) with( this ) {
428        stack.storage = info->storage;
429        with(*stack.storage) {
430                limit     = info->limit;
431                base      = info->base;
432        }
433        __attribute__((may_alias)) intptr_t * istorage = (intptr_t*) &stack.storage;
434        *istorage |= 0x1;
435        name = "Main Thread";
436        state = Start;
437        starter = 0p;
438        last = 0p;
439        cancellation = 0p;
440}
441
442static void ?{}( $thread & this, current_stack_info_t * info) with( this ) {
443        ticket = 1;
444        state = Start;
445        self_cor{ info };
446        curr_cor = &self_cor;
447        curr_cluster = mainCluster;
448        self_mon.owner = &this;
449        self_mon.recursion = 1;
450        self_mon_p = &self_mon;
451        link.next = 0p;
452        link.prev = 0p;
453        #if defined( __CFA_WITH_VERIFY__ )
454                canary = 0x0D15EA5E0D15EA5E;
455        #endif
456
457        node.next = 0p;
458        node.prev = 0p;
459        doregister(curr_cluster, this);
460
461        monitors{ &self_mon_p, 1, (fptr_t)0 };
462}
463
464//-----------------------------------------------------------------------------
465// Processor
466// Construct the processor context of non-main processors
467static void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info) {
468        (this.__cor){ info };
469        this.proc = proc;
470}
471
472static void init(processor & this, const char name[], cluster & _cltr) with( this ) {
473        this.name = name;
474        this.cltr = &_cltr;
475        full_proc = true;
476        destroyer = 0p;
477        do_terminate = false;
478        preemption_alarm = 0p;
479        pending_preemption = false;
480
481        #if !defined(__CFA_NO_STATISTICS__)
482                print_stats = 0;
483                print_halts = false;
484        #endif
485
486        lock( this.cltr->idles );
487                int target = this.cltr->idles.total += 1u;
488        unlock( this.cltr->idles );
489
490        id = doregister((__processor_id_t*)&this);
491
492        // Lock the RWlock so no-one pushes/pops while we are changing the queue
493        uint_fast32_t last_size = ready_mutate_lock();
494
495                // Adjust the ready queue size
496                ready_queue_grow( cltr, target );
497
498        // Unlock the RWlock
499        ready_mutate_unlock( last_size );
500
501        __cfadbg_print_safe(runtime_core, "Kernel : core %p created\n", &this);
502}
503
504// Not a ctor, it just preps the destruction but should not destroy members
505static void deinit(processor & this) {
506        lock( this.cltr->idles );
507                int target = this.cltr->idles.total -= 1u;
508        unlock( this.cltr->idles );
509
510        // Lock the RWlock so no-one pushes/pops while we are changing the queue
511        uint_fast32_t last_size = ready_mutate_lock();
512
513                // Adjust the ready queue size
514                ready_queue_shrink( this.cltr, target );
515
516        // Unlock the RWlock
517        ready_mutate_unlock( last_size );
518
519        // Finally we don't need the read_lock any more
520        unregister((__processor_id_t*)&this);
521}
522
523void ?{}(processor & this, const char name[], cluster & _cltr) {
524        ( this.idle ){};
525        ( this.terminated ){ 0 };
526        ( this.runner ){};
527
528        disable_interrupts();
529                init( this, name, _cltr );
530        enable_interrupts( __cfaabi_dbg_ctx );
531
532        __cfadbg_print_safe(runtime_core, "Kernel : Starting core %p\n", &this);
533
534        this.stack = __create_pthread( &this.kernel_thread, __invoke_processor, (void *)&this );
535
536}
537
538void ^?{}(processor & this) with( this ){
539        if( ! __atomic_load_n(&do_terminate, __ATOMIC_ACQUIRE) ) {
540                __cfadbg_print_safe(runtime_core, "Kernel : core %p signaling termination\n", &this);
541
542                __atomic_store_n(&do_terminate, true, __ATOMIC_RELAXED);
543                __wake_proc( &this );
544
545                P( terminated );
546                verify( kernelTLS.this_processor != &this);
547        }
548
549        int err = pthread_join( kernel_thread, 0p );
550        if( err != 0 ) abort("KERNEL ERROR: joining processor %p caused error %s\n", &this, strerror(err));
551
552        free( this.stack );
553
554        disable_interrupts();
555                deinit( this );
556        enable_interrupts( __cfaabi_dbg_ctx );
557}
558
559//-----------------------------------------------------------------------------
560// Cluster
561static void ?{}(__cluster_idles & this) {
562        this.lock  = 0;
563        this.idle  = 0;
564        this.total = 0;
565        (this.list){};
566}
567
568void ?{}(cluster & this, const char name[], Duration preemption_rate, unsigned num_io, const io_context_params & io_params) with( this ) {
569        this.name = name;
570        this.preemption_rate = preemption_rate;
571        ready_queue{};
572
573        #if !defined(__CFA_NO_STATISTICS__)
574                print_stats = 0;
575                stats = alloc();
576                __init_stats( stats );
577        #endif
578
579        threads{ __get };
580
581        doregister(this);
582
583        // Lock the RWlock so no-one pushes/pops while we are changing the queue
584        disable_interrupts();
585        uint_fast32_t last_size = ready_mutate_lock();
586
587                // Adjust the ready queue size
588                ready_queue_grow( &this, 0 );
589
590        // Unlock the RWlock
591        ready_mutate_unlock( last_size );
592        enable_interrupts_noPoll(); // Don't poll, could be in main cluster
593
594
595        this.io.cnt  = num_io;
596        this.io.ctxs = aalloc(num_io);
597        for(i; this.io.cnt) {
598                (this.io.ctxs[i]){ this, io_params };
599        }
600}
601
602void ^?{}(cluster & this) {
603        for(i; this.io.cnt) {
604                ^(this.io.ctxs[i]){ true };
605        }
606        free(this.io.ctxs);
607
608        // Lock the RWlock so no-one pushes/pops while we are changing the queue
609        disable_interrupts();
610        uint_fast32_t last_size = ready_mutate_lock();
611
612                // Adjust the ready queue size
613                ready_queue_shrink( &this, 0 );
614
615        // Unlock the RWlock
616        ready_mutate_unlock( last_size );
617        enable_interrupts_noPoll(); // Don't poll, could be in main cluster
618
619        #if !defined(__CFA_NO_STATISTICS__)
620                if( 0 != this.print_stats ) {
621                        __print_stats( this.stats, this.print_stats, true, this.name, (void*)&this );
622                }
623                free( this.stats );
624        #endif
625
626        unregister(this);
627}
628
629//=============================================================================================
630// Miscellaneous Initialization
631//=============================================================================================
632//-----------------------------------------------------------------------------
633// Global Queues
634static void doregister( cluster     & cltr ) {
635        lock      ( __cfa_dbg_global_clusters.lock __cfaabi_dbg_ctx2);
636        push_front( __cfa_dbg_global_clusters.list, cltr );
637        unlock    ( __cfa_dbg_global_clusters.lock );
638}
639
640static void unregister( cluster     & cltr ) {
641        lock  ( __cfa_dbg_global_clusters.lock __cfaabi_dbg_ctx2);
642        remove( __cfa_dbg_global_clusters.list, cltr );
643        unlock( __cfa_dbg_global_clusters.lock );
644}
645
646void doregister( cluster * cltr, $thread & thrd ) {
647        lock      (cltr->thread_list_lock __cfaabi_dbg_ctx2);
648        cltr->nthreads += 1;
649        push_front(cltr->threads, thrd);
650        unlock    (cltr->thread_list_lock);
651}
652
653void unregister( cluster * cltr, $thread & thrd ) {
654        lock  (cltr->thread_list_lock __cfaabi_dbg_ctx2);
655        remove(cltr->threads, thrd );
656        cltr->nthreads -= 1;
657        unlock(cltr->thread_list_lock);
658}
659
660static void check( int ret, const char func[] ) {
661        if ( ret ) {                                                                            // pthread routines return errno values
662                abort( "%s : internal error, error(%d) %s.", func, ret, strerror( ret ) );
663        } // if
664} // Abort
665
666void * __create_pthread( pthread_t * pthread, void * (*start)(void *), void * arg ) {
667        pthread_attr_t attr;
668
669        check( pthread_attr_init( &attr ), "pthread_attr_init" ); // initialize attribute
670
671        size_t stacksize;
672        // default stack size, normally defined by shell limit
673        check( pthread_attr_getstacksize( &attr, &stacksize ), "pthread_attr_getstacksize" );
674        assert( stacksize >= PTHREAD_STACK_MIN );
675
676        void * stack;
677        __cfaabi_dbg_debug_do(
678                stack = memalign( __page_size, stacksize + __page_size );
679                // pthread has no mechanism to create the guard page in user supplied stack.
680                if ( mprotect( stack, __page_size, PROT_NONE ) == -1 ) {
681                        abort( "mprotect : internal error, mprotect failure, error(%d) %s.", errno, strerror( errno ) );
682                } // if
683        );
684        __cfaabi_dbg_no_debug_do(
685                stack = malloc( stacksize );
686        );
687
688        check( pthread_attr_setstack( &attr, stack, stacksize ), "pthread_attr_setstack" );
689
690        check( pthread_create( pthread, &attr, start, arg ), "pthread_create" );
691        return stack;
692}
693
694#if defined(__CFA_WITH_VERIFY__)
695static bool verify_fwd_bck_rng(void) {
696        kernelTLS.ready_rng.fwd_seed = 25214903917_l64u * (rdtscl() ^ (uintptr_t)&verify_fwd_bck_rng);
697
698        unsigned values[10];
699        for(i; 10) {
700                values[i] = __tls_rand_fwd();
701        }
702
703        __tls_rand_advance_bck();
704
705        for ( i; 9 -~= 0 ) {
706                if(values[i] != __tls_rand_bck()) {
707                        return false;
708                }
709        }
710
711        return true;
712}
713#endif
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