source: libcfa/src/concurrency/preemption.cfa @ 09bbe78

ADTarm-ehast-experimentalenumforall-pointer-decayjacob/cs343-translationnew-ast-unique-exprpthread-emulationqualifiedEnum
Last change on this file since 09bbe78 was e9b49379, checked in by Peter A. Buhr <pabuhr@…>, 4 years ago

update for 32-bit ARM

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[c81ebf9]1//
2// Cforall Version 1.0.0 Copyright (C) 2016 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// signal.c --
8//
9// Author           : Thierry Delisle
10// Created On       : Mon Jun 5 14:20:42 2017
[6b0b624]11// Last Modified By : Peter A. Buhr
[e9b49379]12// Last Modified On : Wed Aug 26 16:46:03 2020
13// Update Count     : 53
[c81ebf9]14//
15
[2026bb6]16#define __cforall_thread__
17
[73abe95]18#include "preemption.hfa"
[a83ffa4]19#include <assert.h>
[c81ebf9]20
[82ff5845]21#include <errno.h>
22#include <stdio.h>
23#include <string.h>
24#include <unistd.h>
[27f5f71]25#include <limits.h>                                                                             // PTHREAD_STACK_MIN
[c81ebf9]26
[73abe95]27#include "bits/signal.hfa"
[e660761]28#include "kernel_private.hfa"
[82ff5845]29
[d8548e2]30#if !defined(__CFA_DEFAULT_PREEMPTION__)
[2a84d06d]31#define __CFA_DEFAULT_PREEMPTION__ 10`ms
[d8548e2]32#endif
[c81ebf9]33
[2a84d06d]34Duration default_preemption() __attribute__((weak)) {
[c81ebf9]35        return __CFA_DEFAULT_PREEMPTION__;
36}
37
[969b3fe]38// FwdDeclarations : timeout handlers
[c81ebf9]39static void preempt( processor   * this );
[9b1dcc2]40static void timeout( struct __processor_id_t * id, $thread * this );
[c81ebf9]41
[969b3fe]42// FwdDeclarations : Signal handlers
[c29c342]43static void sigHandler_ctxSwitch( __CFA_SIGPARMS__ );
[c59a346]44static void sigHandler_alarm    ( __CFA_SIGPARMS__ );
[c29c342]45static void sigHandler_segv     ( __CFA_SIGPARMS__ );
46static void sigHandler_ill      ( __CFA_SIGPARMS__ );
47static void sigHandler_fpe      ( __CFA_SIGPARMS__ );
48static void sigHandler_abort    ( __CFA_SIGPARMS__ );
[82ff5845]49
[969b3fe]50// FwdDeclarations : alarm thread main
[c29c342]51static void * alarm_loop( __attribute__((unused)) void * args );
[969b3fe]52
53// Machine specific register name
[381fdee]54#if   defined( __i386 )
[b2b44d8]55#define CFA_REG_IP gregs[REG_EIP]
[381fdee]56#elif defined( __x86_64 )
57#define CFA_REG_IP gregs[REG_RIP]
[e9b49379]58#elif defined( __arm__ )
59#define CFA_REG_IP arm_pc
60#elif defined( __aarch64__ )
[482fa08]61#define CFA_REG_IP pc
[381fdee]62#else
[e9b49379]63#error unsupported hardware architecture
[cd17862]64#endif
65
[969b3fe]66KERNEL_STORAGE(event_kernel_t, event_kernel);         // private storage for event kernel
67event_kernel_t * event_kernel;                        // kernel public handle to even kernel
68static pthread_t alarm_thread;                        // pthread handle to alarm thread
[09d4b22]69static void * alarm_stack;                                                        // pthread stack for alarm thread
[969b3fe]70
[c29c342]71static void ?{}(event_kernel_t & this) with( this ) {
[65deb18]72        alarms{};
73        lock{};
[969b3fe]74}
[82ff5845]75
[4dad189]76enum {
77        PREEMPT_NORMAL    = 0,
78        PREEMPT_TERMINATE = 1,
79};
80
[c81ebf9]81//=============================================================================================
82// Kernel Preemption logic
83//=============================================================================================
84
[969b3fe]85// Get next expired node
[2a84d06d]86static inline alarm_node_t * get_expired( alarm_list_t * alarms, Time currtime ) {
[d3ab183]87        if( ! & (*alarms)`first ) return 0p;                                            // If no alarms return null
88        if( (*alarms)`first.alarm >= currtime ) return 0p;      // If alarms head not expired return null
[27f5f71]89        return pop(alarms);                                                                     // Otherwise just pop head
[969b3fe]90}
91
92// Tick one frame of the Discrete Event Simulation for alarms
[9b1dcc2]93static void tick_preemption( struct __processor_id_t * id ) {
[27f5f71]94        alarm_node_t * node = 0p;                                                       // Used in the while loop but cannot be declared in the while condition
95        alarm_list_t * alarms = &event_kernel->alarms;          // Local copy for ease of reading
96        Time currtime = __kernel_get_time();                            // Check current time once so everything "happens at once"
[8cb529e]97
[969b3fe]98        //Loop throught every thing expired
99        while( node = get_expired( alarms, currtime ) ) {
[b1a4300]100                // __cfaabi_dbg_print_buffer_decl( " KERNEL: preemption tick.\n" );
[185efe6]101                Duration period = node->period;
102                if( period == 0) {
103                        node->set = false;                  // Node is one-shot, just mark it as not pending
104                }
[1c273d0]105
[969b3fe]106                // Check if this is a kernel
[c81ebf9]107                if( node->kernel_alarm ) {
108                        preempt( node->proc );
109                }
110                else {
[9b1dcc2]111                        timeout( id, node->thrd );
[c81ebf9]112                }
113
[969b3fe]114                // Check if this is a periodic alarm
[8cb529e]115                if( period > 0 ) {
[b1a4300]116                        // __cfaabi_dbg_print_buffer_local( " KERNEL: alarm period is %lu.\n", period.tv );
[969b3fe]117                        node->alarm = currtime + period;    // Alarm is periodic, add currtime to it (used cached current time)
118                        insert( alarms, node );             // Reinsert the node for the next time it triggers
[c81ebf9]119                }
120        }
121
[969b3fe]122        // If there are still alarms pending, reset the timer
[d3ab183]123        if( & (*alarms)`first ) {
[6a490b2]124                __cfadbg_print_buffer_decl(preemption, " KERNEL: @%ju(%ju) resetting alarm to %ju.\n", currtime.tv, __kernel_get_time().tv, (alarms->head->alarm - currtime).tv);
[d3ab183]125                Duration delta = (*alarms)`first.alarm - currtime;
126                Duration capped = max(delta, 50`us);
[b1a4300]127                // itimerval tim  = { caped };
128                // __cfaabi_dbg_print_buffer_local( "    Values are %lu, %lu, %lu %lu.\n", delta.tv, caped.tv, tim.it_value.tv_sec, tim.it_value.tv_usec);
129
[d3ab183]130                __kernel_set_timer( capped );
[b1a4300]131        }
[c81ebf9]132}
133
[969b3fe]134// Update the preemption of a processor and notify interested parties
[2a84d06d]135void update_preemption( processor * this, Duration duration ) {
[c81ebf9]136        alarm_node_t * alarm = this->preemption_alarm;
137
138        // Alarms need to be enabled
[2a84d06d]139        if ( duration > 0 && ! alarm->set ) {
[c81ebf9]140                alarm->alarm = __kernel_get_time() + duration;
141                alarm->period = duration;
142                register_self( alarm );
143        }
[8ad6533]144        // Zero duration but alarm is set
[c81ebf9]145        else if ( duration == 0 && alarm->set ) {
146                unregister_self( alarm );
147                alarm->alarm = 0;
148                alarm->period = 0;
149        }
150        // If alarm is different from previous, change it
151        else if ( duration > 0 && alarm->period != duration ) {
152                unregister_self( alarm );
153                alarm->alarm = __kernel_get_time() + duration;
154                alarm->period = duration;
155                register_self( alarm );
156        }
157}
158
159//=============================================================================================
[cd17862]160// Kernel Signal Tools
[c81ebf9]161//=============================================================================================
162
[36982fc]163__cfaabi_dbg_debug_do( static thread_local void * last_interrupt = 0; )
[b227f68]164
[82ff5845]165extern "C" {
[969b3fe]166        // Disable interrupts by incrementing the counter
[82ff5845]167        void disable_interrupts() {
[afd550c]168                with( kernelTLS.preemption_state ) {
[1f81d61]169                        #if GCC_VERSION > 50000
[13073be]170                        static_assert(__atomic_always_lock_free(sizeof(enabled), &enabled), "Must be lock-free");
[1f81d61]171                        #endif
[13073be]172
173                        // Set enabled flag to false
174                        // should be atomic to avoid preemption in the middle of the operation.
175                        // use memory order RELAXED since there is no inter-thread on this variable requirements
176                        __atomic_store_n(&enabled, false, __ATOMIC_RELAXED);
177
178                        // Signal the compiler that a fence is needed but only for signal handlers
179                        __atomic_signal_fence(__ATOMIC_ACQUIRE);
180
[de6319f]181                        __attribute__((unused)) unsigned short new_val = disable_count + 1;
182                        disable_count = new_val;
183                        verify( new_val < 65_000u );              // If this triggers someone is disabling interrupts without enabling them
184                }
[82ff5845]185        }
186
[969b3fe]187        // Enable interrupts by decrementing the counter
[c7a900a]188        // If counter reaches 0, execute any pending __cfactx_switch
[36982fc]189        void enable_interrupts( __cfaabi_dbg_ctx_param ) {
[13073be]190                processor   * proc = kernelTLS.this_processor; // Cache the processor now since interrupts can start happening after the atomic store
[8e9e9a2]191                /* paranoid */ verify( proc );
[969b3fe]192
[afd550c]193                with( kernelTLS.preemption_state ){
[de6319f]194                        unsigned short prev = disable_count;
195                        disable_count -= 1;
196                        verify( prev != 0u );                     // If this triggers someone is enabled already enabled interruptsverify( prev != 0u );
197
198                        // Check if we need to prempt the thread because an interrupt was missed
199                        if( prev == 1 ) {
[1f81d61]200                                #if GCC_VERSION > 50000
[13073be]201                                static_assert(__atomic_always_lock_free(sizeof(enabled), &enabled), "Must be lock-free");
[1f81d61]202                                #endif
[13073be]203
204                                // Set enabled flag to true
205                                // should be atomic to avoid preemption in the middle of the operation.
206                                // use memory order RELAXED since there is no inter-thread on this variable requirements
207                                __atomic_store_n(&enabled, true, __ATOMIC_RELAXED);
208
209                                // Signal the compiler that a fence is needed but only for signal handlers
210                                __atomic_signal_fence(__ATOMIC_RELEASE);
[de6319f]211                                if( proc->pending_preemption ) {
212                                        proc->pending_preemption = false;
[3381ed7]213                                        force_yield( __POLL_PREEMPTION );
[de6319f]214                                }
[d0a045c7]215                        }
[82ff5845]216                }
[4e6fb8e]217
[969b3fe]218                // For debugging purposes : keep track of the last person to enable the interrupts
[36982fc]219                __cfaabi_dbg_debug_do( proc->last_enable = caller; )
[82ff5845]220        }
[969b3fe]221
222        // Disable interrupts by incrementint the counter
[c7a900a]223        // Don't execute any pending __cfactx_switch even if counter reaches 0
[969b3fe]224        void enable_interrupts_noPoll() {
[afd550c]225                unsigned short prev = kernelTLS.preemption_state.disable_count;
226                kernelTLS.preemption_state.disable_count -= 1;
[2e9aed4]227                verifyf( prev != 0u, "Incremented from %u\n", prev );                     // If this triggers someone is enabled already enabled interrupts
[d0a045c7]228                if( prev == 1 ) {
[1f81d61]229                        #if GCC_VERSION > 50000
[13073be]230                        static_assert(__atomic_always_lock_free(sizeof(kernelTLS.preemption_state.enabled), &kernelTLS.preemption_state.enabled), "Must be lock-free");
[1f81d61]231                        #endif
[13073be]232                        // Set enabled flag to true
233                        // should be atomic to avoid preemption in the middle of the operation.
234                        // use memory order RELAXED since there is no inter-thread on this variable requirements
235                        __atomic_store_n(&kernelTLS.preemption_state.enabled, true, __ATOMIC_RELAXED);
236
237                        // Signal the compiler that a fence is needed but only for signal handlers
238                        __atomic_signal_fence(__ATOMIC_RELEASE);
[d0a045c7]239                }
[969b3fe]240        }
[82ff5845]241}
242
[969b3fe]243// sigprocmask wrapper : unblock a single signal
[1c273d0]244static inline void signal_unblock( int sig ) {
[82ff5845]245        sigset_t mask;
246        sigemptyset( &mask );
[1c273d0]247        sigaddset( &mask, sig );
[82ff5845]248
[27f5f71]249        if ( pthread_sigmask( SIG_UNBLOCK, &mask, 0p ) == -1 ) {
[169d944]250            abort( "internal error, pthread_sigmask" );
[cd17862]251        }
[82ff5845]252}
253
[969b3fe]254// sigprocmask wrapper : block a single signal
[cd17862]255static inline void signal_block( int sig ) {
256        sigset_t mask;
257        sigemptyset( &mask );
258        sigaddset( &mask, sig );
[47ecf2b]259
[27f5f71]260        if ( pthread_sigmask( SIG_BLOCK, &mask, 0p ) == -1 ) {
[c59a346]261                abort( "internal error, pthread_sigmask" );
[cd17862]262        }
263}
[47ecf2b]264
[969b3fe]265// kill wrapper : signal a processor
[cd17862]266static void preempt( processor * this ) {
[4dad189]267        sigval_t value = { PREEMPT_NORMAL };
268        pthread_sigqueue( this->kernel_thread, SIGUSR1, value );
269}
270
[969b3fe]271// reserved for future use
[9b1dcc2]272static void timeout( struct __processor_id_t * id, $thread * this ) {
[8834751]273        #if !defined( __CFA_NO_STATISTICS__ )
274                kernelTLS.this_stats = this->curr_cluster->stats;
275        #endif
[9b1dcc2]276        __unpark( id, this __cfaabi_dbg_ctx2 );
[cd17862]277}
278
[14a61b5]279// KERNEL ONLY
[c7a900a]280// Check if a __cfactx_switch signal handler shoud defer
[969b3fe]281// If true  : preemption is safe
282// If false : preemption is unsafe and marked as pending
283static inline bool preemption_ready() {
[14a61b5]284        // Check if preemption is safe
285        bool ready = kernelTLS.preemption_state.enabled && ! kernelTLS.preemption_state.in_progress;
286
287        // Adjust the pending flag accordingly
288        kernelTLS.this_processor->pending_preemption = !ready;
[969b3fe]289        return ready;
290}
291
[cd17862]292//=============================================================================================
293// Kernel Signal Startup/Shutdown logic
294//=============================================================================================
295
[969b3fe]296// Startup routine to activate preemption
297// Called from kernel_startup
[e660761]298void __kernel_alarm_startup() {
[169d944]299        __cfaabi_dbg_print_safe( "Kernel : Starting preemption\n" );
[969b3fe]300
301        // Start with preemption disabled until ready
[14a61b5]302        kernelTLS.preemption_state.enabled = false;
303        kernelTLS.preemption_state.disable_count = 1;
[969b3fe]304
305        // Initialize the event kernel
306        event_kernel = (event_kernel_t *)&storage_event_kernel;
[9236060]307        (*event_kernel){};
[969b3fe]308
309        // Setup proper signal handlers
[c7a900a]310        __cfaabi_sigaction( SIGUSR1, sigHandler_ctxSwitch, SA_SIGINFO | SA_RESTART ); // __cfactx_switch handler
[c59a346]311        __cfaabi_sigaction( SIGALRM, sigHandler_alarm    , SA_SIGINFO | SA_RESTART ); // debug handler
[cd17862]312
313        signal_block( SIGALRM );
314
[8c50aed]315        alarm_stack = __create_pthread( &alarm_thread, alarm_loop, 0p );
[cd17862]316}
317
[969b3fe]318// Shutdown routine to deactivate preemption
319// Called from kernel_shutdown
[e660761]320void __kernel_alarm_shutdown() {
[169d944]321        __cfaabi_dbg_print_safe( "Kernel : Preemption stopping\n" );
[d6ff3ff]322
[969b3fe]323        // Block all signals since we are already shutting down
[cd17862]324        sigset_t mask;
325        sigfillset( &mask );
[27f5f71]326        sigprocmask( SIG_BLOCK, &mask, 0p );
[cd17862]327
[969b3fe]328        // Notify the alarm thread of the shutdown
[a0b3e32]329        sigval val = { 1 };
330        pthread_sigqueue( alarm_thread, SIGALRM, val );
[969b3fe]331
332        // Wait for the preemption thread to finish
[27f5f71]333
334        pthread_join( alarm_thread, 0p );
[09d4b22]335        free( alarm_stack );
[969b3fe]336
337        // Preemption is now fully stopped
338
[169d944]339        __cfaabi_dbg_print_safe( "Kernel : Preemption stopped\n" );
[cd17862]340}
341
[969b3fe]342// Raii ctor/dtor for the preemption_scope
343// Used by thread to control when they want to receive preemption signals
[242a902]344void ?{}( preemption_scope & this, processor * proc ) {
[2a84d06d]345        (this.alarm){ proc, (Time){ 0 }, 0`s };
[242a902]346        this.proc = proc;
347        this.proc->preemption_alarm = &this.alarm;
[969b3fe]348
[d8548e2]349        update_preemption( this.proc, this.proc->cltr->preemption_rate );
[cd17862]350}
351
[242a902]352void ^?{}( preemption_scope & this ) {
[cd17862]353        disable_interrupts();
354
[2a84d06d]355        update_preemption( this.proc, 0`s );
[cd17862]356}
357
358//=============================================================================================
359// Kernel Signal Handlers
360//=============================================================================================
[47ecf2b]361
[969b3fe]362// Context switch signal handler
363// Receives SIGUSR1 signal and causes the current thread to yield
[c29c342]364static void sigHandler_ctxSwitch( __CFA_SIGPARMS__ ) {
[b2b44d8]365        __cfaabi_dbg_debug_do( last_interrupt = (void *)(cxt->uc_mcontext.CFA_REG_IP); )
[969b3fe]366
[4dad189]367        // SKULLDUGGERY: if a thread creates a processor and the immediately deletes it,
368        // the interrupt that is supposed to force the kernel thread to preempt might arrive
[482fa08]369        // before the kernel thread has even started running. When that happens, an interrupt
[97cba9f]370        // with a null 'this_processor' will be caught, just ignore it.
[14a61b5]371        if(! kernelTLS.this_processor ) return;
[4dad189]372
373        choose(sfp->si_value.sival_int) {
374                case PREEMPT_NORMAL   : ;// Normal case, nothing to do here
[ea8b2f7]375                case PREEMPT_TERMINATE: verify( __atomic_load_n( &kernelTLS.this_processor->do_terminate, __ATOMIC_SEQ_CST ) );
[4dad189]376                default:
[ff878b7]377                        abort( "internal error, signal value is %d", sfp->si_value.sival_int );
[4dad189]378        }
379
[b2b44d8]380        // Check if it is safe to preempt here
[969b3fe]381        if( !preemption_ready() ) { return; }
382
[b1a4300]383        __cfaabi_dbg_print_buffer_decl( " KERNEL: preempting core %p (%p @ %p).\n", kernelTLS.this_processor, kernelTLS.this_thread, (void *)(cxt->uc_mcontext.CFA_REG_IP) );
[14a61b5]384
385        // Sync flag : prevent recursive calls to the signal handler
386        kernelTLS.preemption_state.in_progress = true;
387
[a83ffa4]388        // Clear sighandler mask before context switching.
[1f81d61]389        #if GCC_VERSION > 50000
[a83ffa4]390        static_assert( sizeof( sigset_t ) == sizeof( cxt->uc_sigmask ), "Expected cxt->uc_sigmask to be of sigset_t" );
[1f81d61]391        #endif
[27f5f71]392        if ( pthread_sigmask( SIG_SETMASK, (sigset_t *)&(cxt->uc_sigmask), 0p ) == -1 ) {
[a83ffa4]393                abort( "internal error, sigprocmask" );
394        }
[05615ba]395
[14a61b5]396        // TODO: this should go in finish action
397        // Clear the in progress flag
398        kernelTLS.preemption_state.in_progress = false;
[969b3fe]399
400        // Preemption can occur here
401
[c7a900a]402        force_yield( __ALARM_PREEMPTION ); // Do the actual __cfactx_switch
[c81ebf9]403}
404
[c59a346]405static void sigHandler_alarm( __CFA_SIGPARMS__ ) {
406        abort("SIGALRM should never reach the signal handler");
[c81ebf9]407}
408
[969b3fe]409// Main of the alarm thread
410// Waits on SIGALRM and send SIGUSR1 to whom ever needs it
[c29c342]411static void * alarm_loop( __attribute__((unused)) void * args ) {
[9b1dcc2]412        __processor_id_t id;
413        id.id = doregister(&id);
414
[969b3fe]415        // Block sigalrms to control when they arrive
[cd17862]416        sigset_t mask;
[ade5272]417        sigfillset(&mask);
[27f5f71]418        if ( pthread_sigmask( SIG_BLOCK, &mask, 0p ) == -1 ) {
[169d944]419            abort( "internal error, pthread_sigmask" );
[82ff5845]420        }
[c81ebf9]421
[ade5272]422        sigemptyset( &mask );
423        sigaddset( &mask, SIGALRM );
424
[969b3fe]425        // Main loop
[cd17862]426        while( true ) {
[969b3fe]427                // Wait for a sigalrm
[a0b3e32]428                siginfo_t info;
429                int sig = sigwaitinfo( &mask, &info );
[969b3fe]430
[e2f7bc3]431                if( sig < 0 ) {
432                        //Error!
433                        int err = errno;
434                        switch( err ) {
435                                case EAGAIN :
436                                case EINTR :
[b1a4300]437                                        {__cfaabi_dbg_print_buffer_decl( " KERNEL: Spurious wakeup %d.\n", err );}
[e2f7bc3]438                                        continue;
[27f5f71]439                                case EINVAL :
[169d944]440                                        abort( "Timeout was invalid." );
[e2f7bc3]441                                default:
[169d944]442                                        abort( "Unhandled error %d", err);
[e2f7bc3]443                        }
444                }
445
[969b3fe]446                // If another signal arrived something went wrong
[8cb529e]447                assertf(sig == SIGALRM, "Kernel Internal Error, sigwait: Unexpected signal %d (%d : %d)\n", sig, info.si_code, info.si_value.sival_int);
448
[169d944]449                // __cfaabi_dbg_print_safe( "Kernel : Caught alarm from %d with %d\n", info.si_code, info.si_value.sival_int );
[969b3fe]450                // Switch on the code (a.k.a. the sender) to
[8cb529e]451                switch( info.si_code )
[a0b3e32]452                {
[969b3fe]453                // Timers can apparently be marked as sent for the kernel
454                // In either case, tick preemption
[8cb529e]455                case SI_TIMER:
456                case SI_KERNEL:
[169d944]457                        // __cfaabi_dbg_print_safe( "Kernel : Preemption thread tick\n" );
[36982fc]458                        lock( event_kernel->lock __cfaabi_dbg_ctx2 );
[9b1dcc2]459                        tick_preemption( &id );
[ea7d2b0]460                        unlock( event_kernel->lock );
[8cb529e]461                        break;
[969b3fe]462                // Signal was not sent by the kernel but by an other thread
[8cb529e]463                case SI_QUEUE:
[969b3fe]464                        // For now, other thread only signal the alarm thread to shut it down
465                        // If this needs to change use info.si_value and handle the case here
[8cb529e]466                        goto EXIT;
[cd17862]467                }
468        }
[a0b3e32]469
[8cb529e]470EXIT:
[169d944]471        __cfaabi_dbg_print_safe( "Kernel : Preemption thread stopping\n" );
[9b1dcc2]472        unregister(&id);
[27f5f71]473        return 0p;
[82ff5845]474}
475
[b68fc85]476//=============================================================================================
477// Kernel Signal Debug
478//=============================================================================================
479
480void __cfaabi_check_preemption() {
[14a61b5]481        bool ready = kernelTLS.preemption_state.enabled;
[b68fc85]482        if(!ready) { abort("Preemption should be ready"); }
483
484        sigset_t oldset;
485        int ret;
[b81fd95]486        ret = pthread_sigmask(0, ( const sigset_t * ) 0p, &oldset);  // workaround trac#208: cast should be unnecessary
[b68fc85]487        if(ret != 0) { abort("ERROR sigprocmask returned %d", ret); }
488
489        ret = sigismember(&oldset, SIGUSR1);
490        if(ret <  0) { abort("ERROR sigismember returned %d", ret); }
491        if(ret == 1) { abort("ERROR SIGUSR1 is disabled"); }
[a83ffa4]492
493        ret = sigismember(&oldset, SIGALRM);
494        if(ret <  0) { abort("ERROR sigismember returned %d", ret); }
495        if(ret == 0) { abort("ERROR SIGALRM is enabled"); }
496
497        ret = sigismember(&oldset, SIGTERM);
498        if(ret <  0) { abort("ERROR sigismember returned %d", ret); }
499        if(ret == 1) { abort("ERROR SIGTERM is disabled"); }
[b68fc85]500}
501
[ea8b2f7]502#ifdef __CFA_WITH_VERIFY__
503bool __cfaabi_dbg_in_kernel() {
504        return !kernelTLS.preemption_state.enabled;
505}
506#endif
507
[6b0b624]508// Local Variables: //
509// mode: c //
510// tab-width: 4 //
511// End: //
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