source: libcfa/src/concurrency/kernel/startup.cfa @ 454f478

arm-ehjacob/cs343-translationnew-ast-unique-expr
Last change on this file since 454f478 was 454f478, checked in by Thierry Delisle <tdelisle@…>, 9 months ago

Re-arranged and commented low-level headers.
Main goal was for better support of weakso locks that are comming.

  • Property mode set to 100644
File size: 23.6 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#include "math.hfa"
32
33#define CFA_PROCESSOR_USE_MMAP 0
34
35//-----------------------------------------------------------------------------
36// Some assembly required
37#if defined( __i386 )
38        #define CtxGet( ctx ) __asm__ volatile ( \
39                "movl %%esp,%0\n" \
40                "movl %%ebp,%1\n" \
41                : "=rm" (ctx.SP), \
42                  "=rm" (ctx.FP) \
43        )
44#elif defined( __x86_64 )
45        #define CtxGet( ctx ) __asm__ volatile ( \
46                "movq %%rsp,%0\n" \
47                "movq %%rbp,%1\n" \
48                : "=rm" (ctx.SP), \
49                  "=rm" (ctx.FP) \
50        )
51#elif defined( __aarch64__ )
52        #define CtxGet( ctx ) __asm__ volatile ( \
53                "mov %0, sp\n" \
54                "mov %1, fp\n" \
55                : "=rm" (ctx.SP), \
56                  "=rm" (ctx.FP) \
57        )
58#else
59        #error unknown hardware architecture
60#endif
61
62//-----------------------------------------------------------------------------
63// Start and stop routine for the kernel, declared first to make sure they run first
64static void __kernel_startup (void) __attribute__(( constructor( STARTUP_PRIORITY_KERNEL ) ));
65static void __kernel_shutdown(void) __attribute__(( destructor ( STARTUP_PRIORITY_KERNEL ) ));
66
67//-----------------------------------------------------------------------------
68// Static Forward Declarations
69struct current_stack_info_t;
70
71static void * __invoke_processor(void * arg);
72static void __kernel_first_resume( processor * this );
73static void __kernel_last_resume ( processor * this );
74static void init(processor & this, const char name[], cluster & _cltr);
75static void deinit(processor & this);
76static void doregister( struct cluster & cltr );
77static void unregister( struct cluster & cltr );
78static void ?{}( $coroutine & this, current_stack_info_t * info);
79static void ?{}( $thread & this, current_stack_info_t * info);
80static void ?{}(processorCtx_t & this) {}
81static void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info);
82
83#if defined(__CFA_WITH_VERIFY__)
84        static bool verify_fwd_bck_rng(void);
85#endif
86
87//-----------------------------------------------------------------------------
88// Forward Declarations for other modules
89extern void __kernel_alarm_startup(void);
90extern void __kernel_alarm_shutdown(void);
91extern void __kernel_io_startup (void);
92extern void __kernel_io_shutdown(void);
93
94//-----------------------------------------------------------------------------
95// Other Forward Declarations
96extern void __wake_proc(processor *);
97
98//-----------------------------------------------------------------------------
99// Kernel storage
100KERNEL_STORAGE(cluster,              mainCluster);
101KERNEL_STORAGE(processor,            mainProcessor);
102KERNEL_STORAGE($thread,              mainThread);
103KERNEL_STORAGE(__stack_t,            mainThreadCtx);
104KERNEL_STORAGE(io_context,           mainPollerThread);
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        NULL,
128        NULL,
129        { 1, false, false },
130};
131
132//-----------------------------------------------------------------------------
133// Struct to steal stack
134struct current_stack_info_t {
135        __stack_t * storage;  // pointer to stack object
136        void * base;          // base of stack
137        void * limit;         // stack grows towards stack limit
138        void * context;       // address of cfa_context_t
139};
140
141void ?{}( current_stack_info_t & this ) {
142        __stack_context_t ctx;
143        CtxGet( ctx );
144        this.base = ctx.FP;
145
146        rlimit r;
147        getrlimit( RLIMIT_STACK, &r);
148        size_t size = r.rlim_cur;
149
150        this.limit = (void *)(((intptr_t)this.base) - size);
151        this.context = &storage_mainThreadCtx;
152}
153
154
155
156//=============================================================================================
157// Kernel Setup logic
158//=============================================================================================
159//-----------------------------------------------------------------------------
160// Kernel boot procedures
161static void __kernel_startup(void) {
162        /* paranoid */ verify( ! __preemption_enabled() );
163        __cfadbg_print_safe(runtime_core, "Kernel : Starting\n");
164
165        __cfa_dbg_global_clusters.list{ __get };
166        __cfa_dbg_global_clusters.lock{};
167
168        /* paranoid */ verify( verify_fwd_bck_rng() );
169
170        // Initialize the global scheduler lock
171        __scheduler_lock = (__scheduler_RWLock_t*)&storage___scheduler_lock;
172        (*__scheduler_lock){};
173
174        // Initialize the main cluster
175        mainCluster = (cluster *)&storage_mainCluster;
176        (*mainCluster){"Main Cluster", 0};
177
178        __cfadbg_print_safe(runtime_core, "Kernel : Main cluster ready\n");
179
180        // Start by initializing the main thread
181        // SKULLDUGGERY: the mainThread steals the process main thread
182        // which will then be scheduled by the mainProcessor normally
183        mainThread = ($thread *)&storage_mainThread;
184        current_stack_info_t info;
185        info.storage = (__stack_t*)&storage_mainThreadCtx;
186        (*mainThread){ &info };
187
188        __cfadbg_print_safe(runtime_core, "Kernel : Main thread ready\n");
189
190
191
192        // Construct the processor context of the main processor
193        void ?{}(processorCtx_t & this, processor * proc) {
194                (this.__cor){ "Processor" };
195                this.__cor.starter = 0p;
196                this.proc = proc;
197        }
198
199        void ?{}(processor & this) with( this ) {
200                ( this.idle ){};
201                ( this.terminated ){};
202                ( this.runner ){};
203                init( this, "Main Processor", *mainCluster );
204                kernel_thread = pthread_self();
205
206                runner{ &this };
207                __cfadbg_print_safe(runtime_core, "Kernel : constructed main processor context %p\n", &runner);
208        }
209
210        // Initialize the main processor and the main processor ctx
211        // (the coroutine that contains the processing control flow)
212        mainProcessor = (processor *)&storage_mainProcessor;
213        (*mainProcessor){};
214
215        //initialize the global state variables
216        __cfaabi_tls.this_processor = mainProcessor;
217        __cfaabi_tls.this_proc_id   = (__processor_id_t*)mainProcessor;
218        __cfaabi_tls.this_thread    = mainThread;
219
220        #if !defined( __CFA_NO_STATISTICS__ )
221                __cfaabi_tls.this_stats = (__stats_t *)& storage_mainProcStats;
222                __init_stats( __cfaabi_tls.this_stats );
223        #endif
224
225        // Enable preemption
226        __kernel_alarm_startup();
227
228        // Start IO
229        __kernel_io_startup();
230
231        // Add the main thread to the ready queue
232        // once resume is called on mainProcessor->runner the mainThread needs to be scheduled like any normal thread
233        __schedule_thread(mainThread);
234
235        // SKULLDUGGERY: Force a context switch to the main processor to set the main thread's context to the current UNIX
236        // context. Hence, the main thread does not begin through __cfactx_invoke_thread, like all other threads. The trick here is that
237        // mainThread is on the ready queue when this call is made.
238        __kernel_first_resume( __cfaabi_tls.this_processor );
239
240
241        // THE SYSTEM IS NOW COMPLETELY RUNNING
242
243
244        // SKULLDUGGERY: The constructor for the mainCluster will call alloc with a dimension of 0
245        // malloc *can* return a non-null value, we should free it if that is the case
246        free( mainCluster->io.ctxs );
247
248        // Now that the system is up, finish creating systems that need threading
249        mainCluster->io.ctxs = (io_context *)&storage_mainPollerThread;
250        mainCluster->io.cnt  = 1;
251        (*mainCluster->io.ctxs){ *mainCluster };
252
253        __cfadbg_print_safe(runtime_core, "Kernel : Started\n--------------------------------------------------\n\n");
254
255        /* paranoid */ verify( ! __preemption_enabled() );
256        enable_interrupts( __cfaabi_dbg_ctx );
257        /* paranoid */ verify( __preemption_enabled() );
258
259}
260
261static void __kernel_shutdown(void) {
262        //Before we start shutting things down, wait for systems that need threading to shutdown
263        ^(*mainCluster->io.ctxs){};
264        mainCluster->io.cnt  = 0;
265        mainCluster->io.ctxs = 0p;
266
267        /* paranoid */ verify( __preemption_enabled() );
268        disable_interrupts();
269        /* paranoid */ verify( ! __preemption_enabled() );
270
271        __cfadbg_print_safe(runtime_core, "\n--------------------------------------------------\nKernel : Shutting down\n");
272
273        // SKULLDUGGERY: Notify the mainProcessor it needs to terminates.
274        // When its coroutine terminates, it return control to the mainThread
275        // which is currently here
276        __atomic_store_n(&mainProcessor->do_terminate, true, __ATOMIC_RELEASE);
277        __kernel_last_resume( __cfaabi_tls.this_processor );
278        mainThread->self_cor.state = Halted;
279
280        // THE SYSTEM IS NOW COMPLETELY STOPPED
281
282        // Disable preemption
283        __kernel_alarm_shutdown();
284
285        // Stop IO
286        __kernel_io_shutdown();
287
288        // Destroy the main processor and its context in reverse order of construction
289        // These were manually constructed so we need manually destroy them
290        void ^?{}(processor & this) with( this ){
291                deinit( this );
292
293                /* paranoid */ verify( this.do_terminate == true );
294                __cfaabi_dbg_print_safe("Kernel : destroyed main processor context %p\n", &runner);
295        }
296
297        ^(*mainProcessor){};
298
299        // Final step, destroy the main thread since it is no longer needed
300
301        // Since we provided a stack to this taxk it will not destroy anything
302        /* paranoid */ verify(mainThread->self_cor.stack.storage == (__stack_t*)(((uintptr_t)&storage_mainThreadCtx)| 0x1));
303        ^(*mainThread){};
304
305        ^(*mainCluster){};
306
307        ^(*__scheduler_lock){};
308
309        ^(__cfa_dbg_global_clusters.list){};
310        ^(__cfa_dbg_global_clusters.lock){};
311
312        __cfadbg_print_safe(runtime_core, "Kernel : Shutdown complete\n");
313}
314
315//=============================================================================================
316// Kernel Initial Scheduling logic
317//=============================================================================================
318
319// Context invoker for processors
320// This is the entry point for processors (kernel threads) *except* for the main processor
321// It effectively constructs a coroutine by stealing the pthread stack
322static void * __invoke_processor(void * arg) {
323        #if !defined( __CFA_NO_STATISTICS__ )
324                __stats_t local_stats;
325                __init_stats( &local_stats );
326                __cfaabi_tls.this_stats = &local_stats;
327        #endif
328
329        processor * proc = (processor *) arg;
330        __cfaabi_tls.this_processor = proc;
331        __cfaabi_tls.this_proc_id   = (__processor_id_t*)proc;
332        __cfaabi_tls.this_thread    = 0p;
333        __cfaabi_tls.preemption_state.[enabled, disable_count] = [false, 1];
334        // SKULLDUGGERY: We want to create a context for the processor coroutine
335        // which is needed for the 2-step context switch. However, there is no reason
336        // to waste the perfectly valid stack create by pthread.
337        current_stack_info_t info;
338        __stack_t ctx;
339        info.storage = &ctx;
340        (proc->runner){ proc, &info };
341
342        __cfaabi_dbg_print_safe("Coroutine : created stack %p\n", get_coroutine(proc->runner)->stack.storage);
343
344        //Set global state
345        __cfaabi_tls.this_thread = 0p;
346
347        //We now have a proper context from which to schedule threads
348        __cfadbg_print_safe(runtime_core, "Kernel : core %p created (%p, %p)\n", proc, &proc->runner, &ctx);
349
350        // SKULLDUGGERY: Since the coroutine doesn't have its own stack, we can't
351        // resume it to start it like it normally would, it will just context switch
352        // back to here. Instead directly call the main since we already are on the
353        // appropriate stack.
354        get_coroutine(proc->runner)->state = Active;
355        main( proc->runner );
356        get_coroutine(proc->runner)->state = Halted;
357
358        // Main routine of the core returned, the core is now fully terminated
359        __cfadbg_print_safe(runtime_core, "Kernel : core %p main ended (%p)\n", proc, &proc->runner);
360
361        #if !defined(__CFA_NO_STATISTICS__)
362                __tally_stats(proc->cltr->stats, &local_stats);
363                if( 0 != proc->print_stats ) {
364                        __print_stats( &local_stats, proc->print_stats, "Processor ", proc->name, (void*)proc );
365                }
366        #endif
367
368        return 0p;
369}
370
371static void __kernel_first_resume( processor * this ) {
372        $thread * src = mainThread;
373        $coroutine * dst = get_coroutine(this->runner);
374
375        /* paranoid */ verify( ! __preemption_enabled() );
376
377        __cfaabi_tls.this_thread->curr_cor = dst;
378        __stack_prepare( &dst->stack, 65000 );
379        __cfactx_start(main, dst, this->runner, __cfactx_invoke_coroutine);
380
381        /* paranoid */ verify( ! __preemption_enabled() );
382
383        dst->last = &src->self_cor;
384        dst->starter = dst->starter ? dst->starter : &src->self_cor;
385
386        // make sure the current state is still correct
387        /* paranoid */ verify(src->state == Ready);
388
389        // context switch to specified coroutine
390        verify( dst->context.SP );
391        __cfactx_switch( &src->context, &dst->context );
392        // when __cfactx_switch returns we are back in the src coroutine
393
394        mainThread->curr_cor = &mainThread->self_cor;
395
396        // make sure the current state has been update
397        /* paranoid */ verify(src->state == Active);
398
399        /* paranoid */ verify( ! __preemption_enabled() );
400}
401
402// KERNEL_ONLY
403static void __kernel_last_resume( processor * this ) {
404        $coroutine * src = &mainThread->self_cor;
405        $coroutine * dst = get_coroutine(this->runner);
406
407        /* paranoid */ verify( ! __preemption_enabled() );
408        /* paranoid */ verify( dst->starter == src );
409        /* paranoid */ verify( dst->context.SP );
410
411        // SKULLDUGGERY in debug the processors check that the
412        // stack is still within the limit of the stack limits after running a thread.
413        // that check doesn't make sense if we context switch to the processor using the
414        // coroutine semantics. Since this is a special case, use the current context
415        // info to populate these fields.
416        __cfaabi_dbg_debug_do(
417                __stack_context_t ctx;
418                CtxGet( ctx );
419                mainThread->context.SP = ctx.SP;
420                mainThread->context.FP = ctx.FP;
421        )
422
423        // context switch to the processor
424        __cfactx_switch( &src->context, &dst->context );
425}
426
427
428//=============================================================================================
429// Kernel Object Constructors logic
430//=============================================================================================
431//-----------------------------------------------------------------------------
432// Main thread construction
433static void ?{}( $coroutine & this, current_stack_info_t * info) with( this ) {
434        stack.storage = info->storage;
435        with(*stack.storage) {
436                limit     = info->limit;
437                base      = info->base;
438        }
439        __attribute__((may_alias)) intptr_t * istorage = (intptr_t*) &stack.storage;
440        *istorage |= 0x1;
441        name = "Main Thread";
442        state = Start;
443        starter = 0p;
444        last = 0p;
445        cancellation = 0p;
446}
447
448static void ?{}( $thread & this, current_stack_info_t * info) with( this ) {
449        ticket = TICKET_RUNNING;
450        state = Start;
451        self_cor{ info };
452        curr_cor = &self_cor;
453        curr_cluster = mainCluster;
454        self_mon.owner = &this;
455        self_mon.recursion = 1;
456        self_mon_p = &self_mon;
457        link.next = 0p;
458        link.prev = 0p;
459        #if defined( __CFA_WITH_VERIFY__ )
460                canary = 0x0D15EA5E0D15EA5Ep;
461        #endif
462
463        node.next = 0p;
464        node.prev = 0p;
465        doregister(curr_cluster, this);
466
467        monitors{ &self_mon_p, 1, (fptr_t)0 };
468}
469
470//-----------------------------------------------------------------------------
471// Processor
472// Construct the processor context of non-main processors
473static void ?{}(processorCtx_t & this, processor * proc, current_stack_info_t * info) {
474        (this.__cor){ info };
475        this.proc = proc;
476}
477
478static void init(processor & this, const char name[], cluster & _cltr) with( this ) {
479        this.name = name;
480        this.cltr = &_cltr;
481        full_proc = true;
482        do_terminate = false;
483        preemption_alarm = 0p;
484        pending_preemption = false;
485
486        #if !defined(__CFA_NO_STATISTICS__)
487                print_stats = 0;
488                print_halts = false;
489        #endif
490
491        lock( this.cltr->idles );
492                int target = this.cltr->idles.total += 1u;
493        unlock( this.cltr->idles );
494
495        id = doregister((__processor_id_t*)&this);
496
497        // Lock the RWlock so no-one pushes/pops while we are changing the queue
498        uint_fast32_t last_size = ready_mutate_lock();
499
500                // Adjust the ready queue size
501                ready_queue_grow( cltr, target );
502
503        // Unlock the RWlock
504        ready_mutate_unlock( last_size );
505
506        __cfadbg_print_safe(runtime_core, "Kernel : core %p created\n", &this);
507}
508
509// Not a ctor, it just preps the destruction but should not destroy members
510static void deinit(processor & this) {
511        lock( this.cltr->idles );
512                int target = this.cltr->idles.total -= 1u;
513        unlock( this.cltr->idles );
514
515        // Lock the RWlock so no-one pushes/pops while we are changing the queue
516        uint_fast32_t last_size = ready_mutate_lock();
517
518                // Adjust the ready queue size
519                ready_queue_shrink( this.cltr, target );
520
521        // Unlock the RWlock
522        ready_mutate_unlock( last_size );
523
524        // Finally we don't need the read_lock any more
525        unregister((__processor_id_t*)&this);
526}
527
528void ?{}(processor & this, const char name[], cluster & _cltr) {
529        ( this.idle ){};
530        ( this.terminated ){};
531        ( this.runner ){};
532
533        disable_interrupts();
534                init( this, name, _cltr );
535        enable_interrupts( __cfaabi_dbg_ctx );
536
537        __cfadbg_print_safe(runtime_core, "Kernel : Starting core %p\n", &this);
538
539        this.stack = __create_pthread( &this.kernel_thread, __invoke_processor, (void *)&this );
540
541}
542
543extern size_t __page_size;
544void ^?{}(processor & this) with( this ){
545        if( ! __atomic_load_n(&do_terminate, __ATOMIC_ACQUIRE) ) {
546                __cfadbg_print_safe(runtime_core, "Kernel : core %p signaling termination\n", &this);
547
548                __atomic_store_n(&do_terminate, true, __ATOMIC_RELAXED);
549                __wake_proc( &this );
550
551                wait( terminated );
552                /* paranoid */ verify( active_processor() != &this);
553        }
554
555        __destroy_pthread( kernel_thread, this.stack, 0p );
556
557        disable_interrupts();
558                deinit( this );
559        enable_interrupts( __cfaabi_dbg_ctx );
560}
561
562//-----------------------------------------------------------------------------
563// Cluster
564static void ?{}(__cluster_idles & this) {
565        this.lock  = 0;
566        this.idle  = 0;
567        this.total = 0;
568        (this.list){};
569}
570
571void ?{}(cluster & this, const char name[], Duration preemption_rate, unsigned num_io, const io_context_params & io_params) with( this ) {
572        this.name = name;
573        this.preemption_rate = preemption_rate;
574        ready_queue{};
575
576        #if !defined(__CFA_NO_STATISTICS__)
577                print_stats = 0;
578                stats = alloc();
579                __init_stats( stats );
580        #endif
581
582        threads{ __get };
583
584        doregister(this);
585
586        // Lock the RWlock so no-one pushes/pops while we are changing the queue
587        disable_interrupts();
588        uint_fast32_t last_size = ready_mutate_lock();
589
590                // Adjust the ready queue size
591                ready_queue_grow( &this, 0 );
592
593        // Unlock the RWlock
594        ready_mutate_unlock( last_size );
595        enable_interrupts_noPoll(); // Don't poll, could be in main cluster
596
597
598        this.io.cnt  = num_io;
599        this.io.ctxs = aalloc(num_io);
600        for(i; this.io.cnt) {
601                (this.io.ctxs[i]){ this, io_params };
602        }
603}
604
605void ^?{}(cluster & this) {
606        for(i; this.io.cnt) {
607                ^(this.io.ctxs[i]){ true };
608        }
609        free(this.io.ctxs);
610
611        // Lock the RWlock so no-one pushes/pops while we are changing the queue
612        disable_interrupts();
613        uint_fast32_t last_size = ready_mutate_lock();
614
615                // Adjust the ready queue size
616                ready_queue_shrink( &this, 0 );
617
618        // Unlock the RWlock
619        ready_mutate_unlock( last_size );
620        enable_interrupts_noPoll(); // Don't poll, could be in main cluster
621
622        #if !defined(__CFA_NO_STATISTICS__)
623                if( 0 != this.print_stats ) {
624                        __print_stats( this.stats, this.print_stats, "Cluster", this.name, (void*)&this );
625                }
626                free( this.stats );
627        #endif
628
629        unregister(this);
630}
631
632//=============================================================================================
633// Miscellaneous Initialization
634//=============================================================================================
635//-----------------------------------------------------------------------------
636// Global Queues
637static void doregister( cluster     & cltr ) {
638        lock      ( __cfa_dbg_global_clusters.lock __cfaabi_dbg_ctx2);
639        push_front( __cfa_dbg_global_clusters.list, cltr );
640        unlock    ( __cfa_dbg_global_clusters.lock );
641}
642
643static void unregister( cluster     & cltr ) {
644        lock  ( __cfa_dbg_global_clusters.lock __cfaabi_dbg_ctx2);
645        remove( __cfa_dbg_global_clusters.list, cltr );
646        unlock( __cfa_dbg_global_clusters.lock );
647}
648
649void doregister( cluster * cltr, $thread & thrd ) {
650        lock      (cltr->thread_list_lock __cfaabi_dbg_ctx2);
651        cltr->nthreads += 1;
652        push_front(cltr->threads, thrd);
653        unlock    (cltr->thread_list_lock);
654}
655
656void unregister( cluster * cltr, $thread & thrd ) {
657        lock  (cltr->thread_list_lock __cfaabi_dbg_ctx2);
658        remove(cltr->threads, thrd );
659        cltr->nthreads -= 1;
660        unlock(cltr->thread_list_lock);
661}
662
663static void check( int ret, const char func[] ) {
664        if ( ret ) {                                                                            // pthread routines return errno values
665                abort( "%s : internal error, error(%d) %s.", func, ret, strerror( ret ) );
666        } // if
667} // Abort
668
669void * __create_pthread( pthread_t * pthread, void * (*start)(void *), void * arg ) {
670        pthread_attr_t attr;
671
672        check( pthread_attr_init( &attr ), "pthread_attr_init" ); // initialize attribute
673
674        size_t stacksize;
675        // default stack size, normally defined by shell limit
676        check( pthread_attr_getstacksize( &attr, &stacksize ), "pthread_attr_getstacksize" );
677        assert( stacksize >= PTHREAD_STACK_MIN );
678
679        void * stack;
680        #if CFA_PROCESSOR_USE_MMAP
681                stacksize = ceiling( stacksize, __page_size ) + __page_size;
682                stack = mmap(0p, stacksize, __map_prot, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
683                if(stack == ((void*)-1)) {
684                        abort( "pthread stack creation : internal error, mmap failure, error(%d) %s.", errno, strerror( errno ) );
685                }
686                if ( mprotect( stack, __page_size, PROT_NONE ) == -1 ) {
687                        abort( "pthread stack creation : internal error, mprotect failure, error(%d) %s.", errno, strerror( errno ) );
688                } // if
689        #else
690                __cfaabi_dbg_debug_do(
691                        stack = memalign( __page_size, stacksize + __page_size );
692                        // pthread has no mechanism to create the guard page in user supplied stack.
693                        if ( mprotect( stack, __page_size, PROT_NONE ) == -1 ) {
694                                abort( "mprotect : internal error, mprotect failure, error(%d) %s.", errno, strerror( errno ) );
695                        } // if
696                );
697                __cfaabi_dbg_no_debug_do(
698                        stack = malloc( stacksize );
699                );
700        #endif
701
702
703        check( pthread_attr_setstack( &attr, stack, stacksize ), "pthread_attr_setstack" );
704
705        check( pthread_create( pthread, &attr, start, arg ), "pthread_create" );
706        return stack;
707}
708
709void __destroy_pthread( pthread_t pthread, void * stack, void ** retval ) {
710        int err = pthread_join( pthread, retval );
711        if( err != 0 ) abort("KERNEL ERROR: joining pthread %p caused error %s\n", (void*)pthread, strerror(err));
712
713        #if CFA_PROCESSOR_USE_MMAP
714                pthread_attr_t attr;
715
716                check( pthread_attr_init( &attr ), "pthread_attr_init" ); // initialize attribute
717
718                size_t stacksize;
719                // default stack size, normally defined by shell limit
720                check( pthread_attr_getstacksize( &attr, &stacksize ), "pthread_attr_getstacksize" );
721                assert( stacksize >= PTHREAD_STACK_MIN );
722                stacksize += __page_size;
723
724                if(munmap(stack, stacksize) == -1) {
725                        abort( "pthread stack destruction : internal error, munmap failure, error(%d) %s.", errno, strerror( errno ) );
726                }
727        #else
728                __cfaabi_dbg_debug_do(
729                        // pthread has no mechanism to create the guard page in user supplied stack.
730                        if ( mprotect( stack, __page_size, __map_prot ) == -1 ) {
731                                abort( "mprotect : internal error, mprotect failure, error(%d) %s.", errno, strerror( errno ) );
732                        } // if
733                );
734                free( stack );
735        #endif
736}
737
738
739#if defined(__CFA_WITH_VERIFY__)
740static bool verify_fwd_bck_rng(void) {
741        __cfaabi_tls.ready_rng.fwd_seed = 25214903917_l64u * (rdtscl() ^ (uintptr_t)&verify_fwd_bck_rng);
742
743        unsigned values[10];
744        for(i; 10) {
745                values[i] = __tls_rand_fwd();
746        }
747
748        __tls_rand_advance_bck();
749
750        for ( i; 9 -~= 0 ) {
751                if(values[i] != __tls_rand_bck()) {
752                        return false;
753                }
754        }
755
756        return true;
757}
758#endif
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