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ADT arm-eh ast-experimental enum forall-pointer-decay jacob/cs343-translation new-ast-unique-expr pthread-emulation qualifiedEnum

Last change on this file since fb15af5 was da3963a, checked in by Thierry Delisle <tdelisle@…>, 5 years ago
Moved bin_sem_t out of kernel.hfa since it's not needed.
Property mode set to `100644`
File size: 23.1 KB

Rev	Line
[8118303]	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	// kernel.c --
	8	//
	9	// Author : Thierry Delisle
[75f3522]	10	// Created On : Tue Jan 17 12:27:26 2017
[6b0b624]	11	// Last Modified By : Peter A. Buhr
[0190480]	12	// Last Modified On : Mon Aug 31 07:08:20 2020
	13	// Update Count : 71
[8118303]	14	//
	15
[2026bb6]	16	#define __cforall_thread__
[4069faad]	17	// #define __CFA_DEBUG_PRINT_RUNTIME_CORE__
[2026bb6]	18
[8118303]	19	//C Includes
[214e8da]	20	#include <errno.h>
[9d944b2]	21	#include <stdio.h>
[58b6d1b]	22	#include <signal.h>
[9d944b2]	23	#include <unistd.h>
[8118303]	24
	25	//CFA Includes
[73abe95]	26	#include "kernel_private.hfa"
	27	#include "preemption.hfa"
[8118303]	28
	29	//Private includes
	30	#define __CFA_INVOKE_PRIVATE__
	31	#include "invoke.h"
	32
[4069faad]	33
[deca0f5]	34	//-----------------------------------------------------------------------------
	35	// Some assembly required
[1805b1b]	36	#if defined( __i386 )
[deca0f5]	37	// mxcr : SSE Status and Control bits (control bits are preserved across function calls)
	38	// fcw : X87 FPU control word (preserved across function calls)
	39	#define __x87_store \
	40	uint32_t __mxcr; \
	41	uint16_t __fcw; \
	42	__asm__ volatile ( \
	43	"stmxcsr %0\n" \
	44	"fnstcw %1\n" \
	45	: "=m" (__mxcr),\
	46	"=m" (__fcw) \
	47	)
	48
	49	#define __x87_load \
	50	__asm__ volatile ( \
	51	"fldcw %1\n" \
	52	"ldmxcsr %0\n" \
	53	::"m" (__mxcr),\
	54	"m" (__fcw) \
	55	)
	56
	57	#elif defined( __x86_64 )
	58	#define __x87_store \
	59	uint32_t __mxcr; \
	60	uint16_t __fcw; \
	61	__asm__ volatile ( \
	62	"stmxcsr %0\n" \
	63	"fnstcw %1\n" \
	64	: "=m" (__mxcr),\
	65	"=m" (__fcw) \
	66	)
	67
	68	#define __x87_load \
	69	__asm__ volatile ( \
	70	"fldcw %1\n" \
	71	"ldmxcsr %0\n" \
	72	:: "m" (__mxcr),\
	73	"m" (__fcw) \
	74	)
	75
[0190480]	76	#elif defined( __arm__ )
	77	#define __x87_store
	78	#define __x87_load
	79
	80	#elif defined( __aarch64__ )
[74f5c83]	81	#define __x87_store \
	82	uint32_t __fpcntl[2]; \
	83	__asm__ volatile ( \
	84	"mrs x9, FPCR\n" \
	85	"mrs x10, FPSR\n" \
	86	"stp x9, x10, %0\n" \
	87	: "=m" (__fpcntl) : : "x9", "x10" \
	88	)
	89
	90	#define __x87_load \
	91	__asm__ volatile ( \
	92	"ldp x9, x10, %0\n" \
	93	"msr FPSR, x10\n" \
	94	"msr FPCR, x9\n" \
	95	: "=m" (__fpcntl) : : "x9", "x10" \
	96	)
	97
[deca0f5]	98	#else
[0190480]	99	#error unsupported hardware architecture
[deca0f5]	100	#endif
	101
[e660761]	102	extern $thread * mainThread;
	103	extern processor * mainProcessor;
[2ac095d]	104
[92e7631]	105	//-----------------------------------------------------------------------------
	106	// Kernel Scheduling logic
	107	static $thread * __next_thread(cluster * this);
[1eb239e4]	108	static $thread * __next_thread_slow(cluster * this);
[92e7631]	109	static void __run_thread(processor * this, $thread * dst);
[e873838]	110	static void __wake_one(cluster * cltr);
[da3963a]	111	static void wait(__bin_sem_t & this);
[1eb239e4]	112
	113	static void push (__cluster_idles & idles, processor & proc);
	114	static void remove(__cluster_idles & idles, processor & proc);
	115	static [unsigned idle, unsigned total, * processor] query( & __cluster_idles idles );
	116
[c84e80a]	117
[75f3522]	118	//=============================================================================================
	119	// Kernel Scheduling logic
	120	//=============================================================================================
[8fcbb4c]	121	//Main of the processor contexts
[83a071f9]	122	void main(processorCtx_t & runner) {
[21184e3]	123	// Because of a bug, we couldn't initialized the seed on construction
	124	// Do it here
[8fc652e0]	125	__cfaabi_tls.rand_seed ^= rdtscl();
	126	__cfaabi_tls.ready_rng.fwd_seed = 25214903917_l64u * (rdtscl() ^ (uintptr_t)&runner);
[f2384c9a]	127	__tls_rand_advance_bck();
[21184e3]	128
[83a071f9]	129	processor * this = runner.proc;
[094476d]	130	verify(this);
[c81ebf9]	131
[4069faad]	132	__cfadbg_print_safe(runtime_core, "Kernel : core %p starting\n", this);
[28d73c1]	133	#if !defined(__CFA_NO_STATISTICS__)
	134	if( this->print_halts ) {
	135	__cfaabi_bits_print_safe( STDOUT_FILENO, "Processor : %d - %s (%p)\n", this->id, this->name, (void*)this);
	136	}
	137	#endif
[b798713]	138
[75f3522]	139	{
[c81ebf9]	140	// Setup preemption data
	141	preemption_scope scope = { this };
	142
[325e6ea]	143	#if !defined(__CFA_NO_STATISTICS__)
	144	unsigned long long last_tally = rdtscl();
	145	#endif
	146
	147
[4069faad]	148	__cfadbg_print_safe(runtime_core, "Kernel : core %p started\n", this);
[8118303]	149
[ac2b598]	150	$thread * readyThread = 0p;
[1eb239e4]	151	MAIN_LOOP:
	152	for() {
[92e7631]	153	// Try to get the next thread
[8c50aed]	154	readyThread = __next_thread( this->cltr );
[75f3522]	155
[1eb239e4]	156	if( !readyThread ) {
	157	readyThread = __next_thread_slow( this->cltr );
	158	}
[4e6fb8e]	159
[1eb239e4]	160	HALT:
	161	if( !readyThread ) {
	162	// Don't block if we are done
	163	if( __atomic_load_n(&this->do_terminate, __ATOMIC_SEQ_CST) ) break MAIN_LOOP;
[c81ebf9]	164
[1eb239e4]	165	#if !defined(__CFA_NO_STATISTICS__)
	166	__tls_stats()->ready.sleep.halts++;
	167	#endif
[398e8e9]	168
[1eb239e4]	169	// Push self to idle stack
	170	push(this->cltr->idles, * this);
[398e8e9]	171
[1eb239e4]	172	// Confirm the ready-queue is empty
	173	readyThread = __next_thread_slow( this->cltr );
	174	if( readyThread ) {
	175	// A thread was found, cancel the halt
	176	remove(this->cltr->idles, * this);
	177
	178	#if !defined(__CFA_NO_STATISTICS__)
	179	__tls_stats()->ready.sleep.cancels++;
	180	#endif
	181
	182	// continue the mai loop
	183	break HALT;
	184	}
	185
	186	#if !defined(__CFA_NO_STATISTICS__)
	187	if(this->print_halts) {
	188	__cfaabi_bits_print_safe( STDOUT_FILENO, "PH:%d - %lld 0\n", this->id, rdtscl());
	189	}
	190	#endif
	191
	192	wait( this->idle );
	193
	194	#if !defined(__CFA_NO_STATISTICS__)
	195	if(this->print_halts) {
	196	__cfaabi_bits_print_safe( STDOUT_FILENO, "PH:%d - %lld 1\n", this->id, rdtscl());
	197	}
	198	#endif
	199
	200	// We were woken up, remove self from idle
	201	remove(this->cltr->idles, * this);
	202
	203	// DON'T just proceed, start looking again
	204	continue MAIN_LOOP;
[64a7146]	205	}
[1eb239e4]	206
	207	/* paranoid */ verify( readyThread );
	208
	209	// We found a thread run it
	210	__run_thread(this, readyThread);
	211
	212	// Are we done?
	213	if( __atomic_load_n(&this->do_terminate, __ATOMIC_SEQ_CST) ) break MAIN_LOOP;
[325e6ea]	214
	215	#if !defined(__CFA_NO_STATISTICS__)
	216	unsigned long long curr = rdtscl();
	217	if(curr > (last_tally + 500000000)) {
	218	__tally_stats(this->cltr->stats, __cfaabi_tls.this_stats);
	219	last_tally = curr;
	220	}
	221	#endif
[c81ebf9]	222	}
	223
[4069faad]	224	__cfadbg_print_safe(runtime_core, "Kernel : core %p stopping\n", this);
[c84e80a]	225	}
[8118303]	226
[454f478]	227	post( this->terminated );
[bdeba0b]	228
[28d73c1]	229	if(this == mainProcessor) {
[6a490b2]	230	// HACK : the coroutine context switch expects this_thread to be set
	231	// and it make sense for it to be set in all other cases except here
	232	// fake it
[8fc652e0]	233	__cfaabi_tls.this_thread = mainThread;
[6a490b2]	234	}
[7768b8d]	235
[4069faad]	236	__cfadbg_print_safe(runtime_core, "Kernel : core %p terminated\n", this);
[c84e80a]	237	}
	238
[5c1a531]	239	static int * __volatile_errno() __attribute__((noinline));
	240	static int * __volatile_errno() { asm(""); return &errno; }
	241
[14a61b5]	242	// KERNEL ONLY
[1c273d0]	243	// runThread runs a thread by context switching
	244	// from the processor coroutine to the target thread
[ac2b598]	245	static void __run_thread(processor * this, $thread * thrd_dst) {
[8fc652e0]	246	/* paranoid */ verify( ! __preemption_enabled() );
[1eb239e4]	247	/* paranoid */ verifyf( thrd_dst->state == Ready \|\| thrd_dst->preempted != __NO_PREEMPTION, "state : %d, preempted %d\n", thrd_dst->state, thrd_dst->preempted);
	248	/* paranoid */ verifyf( thrd_dst->link.next == 0p, "Expected null got %p", thrd_dst->link.next );
	249	__builtin_prefetch( thrd_dst->context.SP );
	250
[ac2b598]	251	$coroutine * proc_cor = get_coroutine(this->runner);
[8fcbb4c]	252
[9f575ea]	253	// set state of processor coroutine to inactive
	254	verify(proc_cor->state == Active);
[ae7be7a]	255	proc_cor->state = Blocked;
[e8e457e]	256
[9f575ea]	257	// Actually run the thread
[3381ed7]	258	RUNNING: while(true) {
[ff79d5e]	259	thrd_dst->preempted = __NO_PREEMPTION;
	260	thrd_dst->state = Active;
[e8e457e]	261
[58d64a4]	262	// Update global state
[8fc652e0]	263	kernelTLS().this_thread = thrd_dst;
[75f3522]	264
[8fc652e0]	265	/* paranoid */ verify( ! __preemption_enabled() );
	266	/* paranoid */ verify( kernelTLS().this_thread == thrd_dst );
[9d6e1b8a]	267	/* paranoid */ verify( thrd_dst->curr_cluster == this->cltr );
[b4b63e8]	268	/* paranoid */ verify( thrd_dst->context.SP );
[5afb49a]	269	/* paranoid */ verify( thrd_dst->state != Halted );
[210b8b3]	270	/* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) < ((uintptr_t)__get_stack(thrd_dst->curr_cor)->base ) \|\| thrd_dst->curr_cor == proc_cor, "ERROR : Destination $thread %p has been corrupted.\n StackPointer too small.\n", thrd_dst ); // add escape condition if we are setting up the processor
	271	/* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) > ((uintptr_t)__get_stack(thrd_dst->curr_cor)->limit) \|\| thrd_dst->curr_cor == proc_cor, "ERROR : Destination $thread %p has been corrupted.\n StackPointer too large.\n", thrd_dst ); // add escape condition if we are setting up the processor
[ac12f1f]	272	/* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_dst->canary );
[b4b63e8]	273
[3381ed7]	274
[58d64a4]	275
[9f575ea]	276	// set context switch to the thread that the processor is executing
[c7a900a]	277	__cfactx_switch( &proc_cor->context, &thrd_dst->context );
	278	// when __cfactx_switch returns we are back in the processor coroutine
[9f575ea]	279
[ac12f1f]	280	/* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_dst->canary );
[210b8b3]	281	/* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) > ((uintptr_t)__get_stack(thrd_dst->curr_cor)->limit), "ERROR : Destination $thread %p has been corrupted.\n StackPointer too large.\n", thrd_dst );
	282	/* paranoid */ verifyf( ((uintptr_t)thrd_dst->context.SP) < ((uintptr_t)__get_stack(thrd_dst->curr_cor)->base ), "ERROR : Destination $thread %p has been corrupted.\n StackPointer too small.\n", thrd_dst );
[b4b63e8]	283	/* paranoid */ verify( thrd_dst->context.SP );
[9d6e1b8a]	284	/* paranoid */ verify( thrd_dst->curr_cluster == this->cltr );
[8fc652e0]	285	/* paranoid */ verify( kernelTLS().this_thread == thrd_dst );
	286	/* paranoid */ verify( ! __preemption_enabled() );
[75f3522]	287
[58d64a4]	288	// Reset global state
[8fc652e0]	289	kernelTLS().this_thread = 0p;
[3381ed7]	290
	291	// We just finished running a thread, there are a few things that could have happened.
	292	// 1 - Regular case : the thread has blocked and now one has scheduled it yet.
	293	// 2 - Racy case : the thread has blocked but someone has already tried to schedule it.
	294	// 4 - Preempted
	295	// In case 1, we may have won a race so we can't write to the state again.
	296	// In case 2, we lost the race so we now own the thread.
	297
	298	if(unlikely(thrd_dst->preempted != __NO_PREEMPTION)) {
	299	// The thread was preempted, reschedule it and reset the flag
[e873838]	300	__schedule_thread( thrd_dst );
[3381ed7]	301	break RUNNING;
	302	}
[75f3522]	303
[3ea8ad1]	304	if(unlikely(thrd_dst->state == Halting)) {
[ff79d5e]	305	// The thread has halted, it should never be scheduled/run again
[5afb49a]	306	// finish the thread
	307	__thread_finish( thrd_dst );
[ff79d5e]	308	break RUNNING;
	309	}
	310
	311	/* paranoid */ verify( thrd_dst->state == Active );
	312	thrd_dst->state = Blocked;
	313
[3381ed7]	314	// set state of processor coroutine to active and the thread to inactive
[ff79d5e]	315	int old_ticket = __atomic_fetch_sub(&thrd_dst->ticket, 1, __ATOMIC_SEQ_CST);
	316	switch(old_ticket) {
[6a77224]	317	case TICKET_RUNNING:
[3381ed7]	318	// This is case 1, the regular case, nothing more is needed
	319	break RUNNING;
[6a77224]	320	case TICKET_UNBLOCK:
[3381ed7]	321	// This is case 2, the racy case, someone tried to run this thread before it finished blocking
	322	// In this case, just run it again.
	323	continue RUNNING;
	324	default:
	325	// This makes no sense, something is wrong abort
[ff79d5e]	326	abort();
[3381ed7]	327	}
[9f575ea]	328	}
[e8e457e]	329
[9f575ea]	330	// Just before returning to the processor, set the processor coroutine to active
[e8e457e]	331	proc_cor->state = Active;
[1eb239e4]	332
[8fc652e0]	333	/* paranoid */ verify( ! __preemption_enabled() );
[82c948c]	334	}
	335
[14a61b5]	336	// KERNEL_ONLY
[b0c7419]	337	void returnToKernel() {
[8fc652e0]	338	/* paranoid */ verify( ! __preemption_enabled() );
	339	$coroutine * proc_cor = get_coroutine(kernelTLS().this_processor->runner);
	340	$thread * thrd_src = kernelTLS().this_thread;
[e8e457e]	341
[29cb302]	342	#if !defined(__CFA_NO_STATISTICS__)
[8fc652e0]	343	struct processor * last_proc = kernelTLS().this_processor;
[29cb302]	344	#endif
	345
[9f575ea]	346	// Run the thread on this processor
	347	{
	348	int local_errno = *__volatile_errno();
	349	#if defined( __i386 ) \|\| defined( __x86_64 )
	350	__x87_store;
	351	#endif
[b4b63e8]	352	/* paranoid */ verify( proc_cor->context.SP );
[ac12f1f]	353	/* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_src->canary );
[c7a900a]	354	__cfactx_switch( &thrd_src->context, &proc_cor->context );
[ac12f1f]	355	/* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd_src->canary );
[9f575ea]	356	#if defined( __i386 ) \|\| defined( __x86_64 )
	357	__x87_load;
	358	#endif
	359	*__volatile_errno() = local_errno;
[8fcbb4c]	360	}
[deca0f5]	361
[29cb302]	362	#if !defined(__CFA_NO_STATISTICS__)
[8fc652e0]	363	if(last_proc != kernelTLS().this_processor) {
[29cb302]	364	__tls_stats()->ready.threads.migration++;
	365	}
	366	#endif
	367
[8fc652e0]	368	/* paranoid */ verify( ! __preemption_enabled() );
[210b8b3]	369	/* paranoid */ verifyf( ((uintptr_t)thrd_src->context.SP) < ((uintptr_t)__get_stack(thrd_src->curr_cor)->base ), "ERROR : Returning $thread %p has been corrupted.\n StackPointer too small.\n", thrd_src );
	370	/* paranoid */ verifyf( ((uintptr_t)thrd_src->context.SP) > ((uintptr_t)__get_stack(thrd_src->curr_cor)->limit), "ERROR : Returning $thread %p has been corrupted.\n StackPointer too large.\n", thrd_src );
[c84e80a]	371	}
	372
[8def349]	373	//-----------------------------------------------------------------------------
	374	// Scheduler routines
[14a61b5]	375	// KERNEL ONLY
[e873838]	376	void __schedule_thread( $thread * thrd ) {
[8fc652e0]	377	/* paranoid */ verify( ! __preemption_enabled() );
[9d6e1b8a]	378	/* paranoid */ verify( kernelTLS().this_proc_id );
[6a490b2]	379	/* paranoid */ verify( thrd );
	380	/* paranoid */ verify( thrd->state != Halted );
[9d6e1b8a]	381	/* paranoid */ verify( thrd->curr_cluster );
[3381ed7]	382	/* paranoid */ #if defined( __CFA_WITH_VERIFY__ )
[504a7dc]	383	/* paranoid */ if( thrd->state == Blocked \|\| thrd->state == Start ) assertf( thrd->preempted == __NO_PREEMPTION,
	384	"Error inactive thread marked as preempted, state %d, preemption %d\n", thrd->state, thrd->preempted );
[ff79d5e]	385	/* paranoid */ if( thrd->preempted != __NO_PREEMPTION ) assertf(thrd->state == Active,
[504a7dc]	386	"Error preempted thread marked as not currently running, state %d, preemption %d\n", thrd->state, thrd->preempted );
[3381ed7]	387	/* paranoid */ #endif
[6a490b2]	388	/* paranoid */ verifyf( thrd->link.next == 0p, "Expected null got %p", thrd->link.next );
[ac12f1f]	389	/* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd->canary );
[b4b63e8]	390
[9f575ea]	391
[ae7be7a]	392	if (thrd->preempted == __NO_PREEMPTION) thrd->state = Ready;
[6b4cdd3]	393
[e873838]	394	ready_schedule_lock();
[32a8b61]	395	// Dereference the thread now because once we push it, there is not guaranteed it's still valid.
	396	struct cluster * cl = thrd->curr_cluster;
	397
	398	// push the thread to the cluster ready-queue
	399	push( cl, thrd );
	400
	401	// variable thrd is no longer safe to use
	402
	403	// wake the cluster using the save variable.
	404	__wake_one( cl );
[e873838]	405	ready_schedule_unlock();
[1c273d0]	406
[8fc652e0]	407	/* paranoid */ verify( ! __preemption_enabled() );
[db6f06a]	408	}
	409
[14a61b5]	410	// KERNEL ONLY
[1eb239e4]	411	static inline $thread * __next_thread(cluster * this) with( *this ) {
[8fc652e0]	412	/* paranoid */ verify( ! __preemption_enabled() );
	413	/* paranoid */ verify( kernelTLS().this_proc_id );
[7768b8d]	414
[e873838]	415	ready_schedule_lock();
[1eb239e4]	416	$thread * thrd = pop( this );
[e873838]	417	ready_schedule_unlock();
[7768b8d]	418
[8fc652e0]	419	/* paranoid */ verify( kernelTLS().this_proc_id );
	420	/* paranoid */ verify( ! __preemption_enabled() );
[1eb239e4]	421	return thrd;
[eb2e723]	422	}
	423
[64a7146]	424	// KERNEL ONLY
[1eb239e4]	425	static inline $thread * __next_thread_slow(cluster * this) with( *this ) {
[8fc652e0]	426	/* paranoid */ verify( ! __preemption_enabled() );
	427	/* paranoid */ verify( kernelTLS().this_proc_id );
[64a7146]	428
[e873838]	429	ready_schedule_lock();
[1eb239e4]	430	$thread * thrd = pop_slow( this );
[e873838]	431	ready_schedule_unlock();
[64a7146]	432
[8fc652e0]	433	/* paranoid */ verify( kernelTLS().this_proc_id );
	434	/* paranoid */ verify( ! __preemption_enabled() );
[1eb239e4]	435	return thrd;
[64a7146]	436	}
	437
[e873838]	438	void unpark( $thread * thrd ) {
	439	if( !thrd ) return;
	440
[ff79d5e]	441	int old_ticket = __atomic_fetch_add(&thrd->ticket, 1, __ATOMIC_SEQ_CST);
	442	switch(old_ticket) {
[6a77224]	443	case TICKET_RUNNING:
[3381ed7]	444	// Wake won the race, the thread will reschedule/rerun itself
	445	break;
[6a77224]	446	case TICKET_BLOCKED:
[3381ed7]	447	/* paranoid */ verify( ! thrd->preempted != __NO_PREEMPTION );
[ff79d5e]	448	/* paranoid */ verify( thrd->state == Blocked );
[0b33412]	449
[8fc652e0]	450	{
	451	/* paranoid */ verify( publicTLS_get(this_proc_id) );
	452	bool full = publicTLS_get(this_proc_id)->full_proc;
	453	if(full) disable_interrupts();
	454
	455	/* paranoid */ verify( ! __preemption_enabled() );
	456
	457	// Wake lost the race,
	458	__schedule_thread( thrd );
	459
	460	/* paranoid */ verify( ! __preemption_enabled() );
	461
	462	if(full) enable_interrupts( __cfaabi_dbg_ctx );
	463	/* paranoid */ verify( publicTLS_get(this_proc_id) );
	464	}
	465
[3381ed7]	466	break;
	467	default:
	468	// This makes no sense, something is wrong abort
[7ee8153]	469	abort("Thread %p (%s) has mismatch park/unpark\n", thrd, thrd->self_cor.name);
[de6319f]	470	}
[eb2e723]	471	}
	472
[e235429]	473	void park( void ) {
[8fc652e0]	474	/* paranoid */ verify( __preemption_enabled() );
[82ff5845]	475	disable_interrupts();
[8fc652e0]	476	/* paranoid */ verify( ! __preemption_enabled() );
	477	/* paranoid */ verify( kernelTLS().this_thread->preempted == __NO_PREEMPTION );
[0b33412]	478
[82c948c]	479	returnToKernel();
[0b33412]	480
[8fc652e0]	481	/* paranoid */ verify( ! __preemption_enabled() );
[36982fc]	482	enable_interrupts( __cfaabi_dbg_ctx );
[8fc652e0]	483	/* paranoid */ verify( __preemption_enabled() );
[0c78741]	484
	485	}
[09800e9]	486
[5afb49a]	487	extern "C" {
	488	// Leave the thread monitor
	489	// last routine called by a thread.
	490	// Should never return
	491	void __cfactx_thrd_leave() {
[8fc652e0]	492	$thread * thrd = active_thread();
[5afb49a]	493	$monitor * this = &thrd->self_mon;
	494
	495	// Lock the monitor now
	496	lock( this->lock __cfaabi_dbg_ctx2 );
	497
	498	disable_interrupts();
	499
[9d6e1b8a]	500	/* paranoid */ verify( ! __preemption_enabled() );
	501	/* paranoid */ verify( thrd->state == Active );
	502	/* paranoid */ verify( 0x0D15EA5E0D15EA5Ep == thrd->canary );
	503	/* paranoid */ verify( kernelTLS().this_thread == thrd );
	504	/* paranoid */ verify( thrd->context.SP );
	505	/* paranoid */ verifyf( ((uintptr_t)thrd->context.SP) > ((uintptr_t)__get_stack(thrd->curr_cor)->limit), "ERROR : $thread %p has been corrupted.\n StackPointer too large.\n", thrd );
	506	/* paranoid */ verifyf( ((uintptr_t)thrd->context.SP) < ((uintptr_t)__get_stack(thrd->curr_cor)->base ), "ERROR : $thread %p has been corrupted.\n StackPointer too small.\n", thrd );
	507
[3ea8ad1]	508	thrd->state = Halting;
[58688bf]	509	if( TICKET_RUNNING != thrd->ticket ) { abort( "Thread terminated with pending unpark" ); }
[9d6e1b8a]	510	if( thrd != this->owner ) { abort( "Thread internal monitor has incorrect owner" ); }
	511	if( this->recursion != 1) { abort( "Thread internal monitor has unbalanced recursion" ); }
[5afb49a]	512
	513	// Leave the thread
	514	returnToKernel();
	515
	516	// Control flow should never reach here!
[9d6e1b8a]	517	abort();
[5afb49a]	518	}
[09800e9]	519	}
	520
[14a61b5]	521	// KERNEL ONLY
[3381ed7]	522	bool force_yield( __Preemption_Reason reason ) {
[8fc652e0]	523	/* paranoid */ verify( __preemption_enabled() );
[09800e9]	524	disable_interrupts();
[8fc652e0]	525	/* paranoid */ verify( ! __preemption_enabled() );
[09800e9]	526
[8fc652e0]	527	$thread * thrd = kernelTLS().this_thread;
[ff79d5e]	528	/* paranoid */ verify(thrd->state == Active);
[3381ed7]	529
	530	// SKULLDUGGERY: It is possible that we are preempting this thread just before
	531	// it was going to park itself. If that is the case and it is already using the
	532	// intrusive fields then we can't use them to preempt the thread
	533	// If that is the case, abandon the preemption.
	534	bool preempted = false;
[504a7dc]	535	if(thrd->link.next == 0p) {
[3381ed7]	536	preempted = true;
	537	thrd->preempted = reason;
	538	returnToKernel();
[de6319f]	539	}
[f2b12406]	540
[8fc652e0]	541	/* paranoid */ verify( ! __preemption_enabled() );
[3381ed7]	542	enable_interrupts_noPoll();
[8fc652e0]	543	/* paranoid */ verify( __preemption_enabled() );
[f2b12406]	544
[3381ed7]	545	return preempted;
[f2b12406]	546	}
	547
[14a61b5]	548	//=============================================================================================
[92e7631]	549	// Kernel Idle Sleep
[14a61b5]	550	//=============================================================================================
[da3963a]	551	extern "C" {
	552	char * strerror(int);
	553	}
	554	#define CHECKED(x) { int err = x; if( err != 0 ) abort("KERNEL ERROR: Operation \"" #x "\" return error %d - %s\n", err, strerror(err)); }
	555
	556	static void wait(__bin_sem_t & this) with( this ) {
	557	verify(__cfaabi_dbg_in_kernel());
	558	CHECKED( pthread_mutex_lock(&lock) );
	559	while(val < 1) {
	560	pthread_cond_wait(&cond, &lock);
	561	}
	562	val -= 1;
	563	CHECKED( pthread_mutex_unlock(&lock) );
	564	}
	565
	566	static bool post(__bin_sem_t & this) with( this ) {
	567	bool needs_signal = false;
	568
	569	CHECKED( pthread_mutex_lock(&lock) );
	570	if(val < 1) {
	571	val += 1;
	572	pthread_cond_signal(&cond);
	573	needs_signal = true;
	574	}
	575	CHECKED( pthread_mutex_unlock(&lock) );
	576
	577	return needs_signal;
	578	}
	579
	580	#undef CHECKED
	581
[64a7146]	582	// Wake a thread from the front if there are any
[e873838]	583	static void __wake_one(cluster * this) {
[8fc652e0]	584	/* paranoid */ verify( ! __preemption_enabled() );
[e873838]	585	/* paranoid */ verify( ready_schedule_islocked() );
[14a61b5]	586
[64a7146]	587	// Check if there is a sleeping processor
[1eb239e4]	588	processor * p;
	589	unsigned idle;
	590	unsigned total;
	591	[idle, total, p] = query(this->idles);
[14a61b5]	592
[64a7146]	593	// If no one is sleeping, we are done
[1eb239e4]	594	if( idle == 0 ) return;
[14a61b5]	595
[64a7146]	596	// We found a processor, wake it up
	597	post( p->idle );
[14a61b5]	598
[1eb239e4]	599	#if !defined(__CFA_NO_STATISTICS__)
	600	__tls_stats()->ready.sleep.wakes++;
	601	#endif
	602
[e873838]	603	/* paranoid */ verify( ready_schedule_islocked() );
[8fc652e0]	604	/* paranoid */ verify( ! __preemption_enabled() );
[1eb239e4]	605
	606	return;
[64a7146]	607	}
[14a61b5]	608
[64a7146]	609	// Unconditionnaly wake a thread
[1eb239e4]	610	void __wake_proc(processor * this) {
[64a7146]	611	__cfadbg_print_safe(runtime_core, "Kernel : waking Processor %p\n", this);
[14a61b5]	612
[64a7146]	613	disable_interrupts();
[8fc652e0]	614	/* paranoid */ verify( ! __preemption_enabled() );
[58d64a4]	615	post( this->idle );
[64a7146]	616	enable_interrupts( __cfaabi_dbg_ctx );
[92e7631]	617	}
	618
[1eb239e4]	619	static void push (__cluster_idles & this, processor & proc) {
[8fc652e0]	620	/* paranoid */ verify( ! __preemption_enabled() );
[1eb239e4]	621	lock( this );
	622	this.idle++;
	623	/* paranoid */ verify( this.idle <= this.total );
[8e16177]	624
[1eb239e4]	625	insert_first(this.list, proc);
	626	unlock( this );
[8fc652e0]	627	/* paranoid */ verify( ! __preemption_enabled() );
[1eb239e4]	628	}
[8e16177]	629
[1eb239e4]	630	static void remove(__cluster_idles & this, processor & proc) {
[8fc652e0]	631	/* paranoid */ verify( ! __preemption_enabled() );
[1eb239e4]	632	lock( this );
	633	this.idle--;
	634	/* paranoid */ verify( this.idle >= 0 );
[c34ebf2]	635
[1eb239e4]	636	remove(proc);
	637	unlock( this );
[8fc652e0]	638	/* paranoid */ verify( ! __preemption_enabled() );
[1eb239e4]	639	}
[c34ebf2]	640
[1eb239e4]	641	static [unsigned idle, unsigned total, * processor] query( & __cluster_idles this ) {
	642	for() {
	643	uint64_t l = __atomic_load_n(&this.lock, __ATOMIC_SEQ_CST);
	644	if( 1 == (l % 2) ) { Pause(); continue; }
	645	unsigned idle = this.idle;
	646	unsigned total = this.total;
	647	processor * proc = &this.list`first;
[7fdae38]	648	// Compiler fence is unnecessary, but gcc-8 and older incorrectly reorder code without it
	649	asm volatile("": : :"memory");
[1eb239e4]	650	if(l != __atomic_load_n(&this.lock, __ATOMIC_SEQ_CST)) { Pause(); continue; }
	651	return [idle, total, proc];
	652	}
[6b4cdd3]	653	}
	654
[dbe9b08]	655	//=============================================================================================
	656	// Unexpected Terminating logic
	657	//=============================================================================================
[92bfda0]	658	void __kernel_abort_msg( char * abort_text, int abort_text_size ) {
	659	$thread * thrd = __cfaabi_tls.this_thread;
[9d944b2]	660
[de94a60]	661	if(thrd) {
	662	int len = snprintf( abort_text, abort_text_size, "Error occurred while executing thread %.256s (%p)", thrd->self_cor.name, thrd );
[1c40091]	663	__cfaabi_bits_write( STDERR_FILENO, abort_text, len );
[de94a60]	664
[212c2187]	665	if ( &thrd->self_cor != thrd->curr_cor ) {
	666	len = snprintf( abort_text, abort_text_size, " in coroutine %.256s (%p).\n", thrd->curr_cor->name, thrd->curr_cor );
[1c40091]	667	__cfaabi_bits_write( STDERR_FILENO, abort_text, len );
[de94a60]	668	}
	669	else {
[1c40091]	670	__cfaabi_bits_write( STDERR_FILENO, ".\n", 2 );
[de94a60]	671	}
[1c273d0]	672	}
[9d944b2]	673	else {
[de94a60]	674	int len = snprintf( abort_text, abort_text_size, "Error occurred outside of any thread.\n" );
[1c40091]	675	__cfaabi_bits_write( STDERR_FILENO, abort_text, len );
[9d944b2]	676	}
	677	}
	678
[92bfda0]	679	int __kernel_abort_lastframe( void ) __attribute__ ((__nothrow__)) {
	680	return get_coroutine(__cfaabi_tls.this_thread) == get_coroutine(mainThread) ? 4 : 2;
[2b8bc41]	681	}
	682
[de94a60]	683	static __spinlock_t kernel_debug_lock;
	684
[9d944b2]	685	extern "C" {
[1c40091]	686	void __cfaabi_bits_acquire() {
[36982fc]	687	lock( kernel_debug_lock __cfaabi_dbg_ctx2 );
[9d944b2]	688	}
	689
[1c40091]	690	void __cfaabi_bits_release() {
[ea7d2b0]	691	unlock( kernel_debug_lock );
[9d944b2]	692	}
[8118303]	693	}
	694
[fa21ac9]	695	//=============================================================================================
	696	// Kernel Utilities
	697	//=============================================================================================
[de94a60]	698	//-----------------------------------------------------------------------------
	699	// Debug
	700	__cfaabi_dbg_debug_do(
[1997b4e]	701	extern "C" {
[ae66348]	702	void __cfaabi_dbg_record_lock(__spinlock_t & this, const char prev_name[]) {
[1997b4e]	703	this.prev_name = prev_name;
[8fc652e0]	704	this.prev_thrd = kernelTLS().this_thread;
[1997b4e]	705	}
[9181f1d]	706	}
[f7d6bb0]	707	)
[2026bb6]	708
	709	//-----------------------------------------------------------------------------
	710	// Debug
[8c50aed]	711	bool threading_enabled(void) __attribute__((const)) {
[2026bb6]	712	return true;
	713	}
[c34ebf2]	714
	715	//-----------------------------------------------------------------------------
	716	// Statistics
	717	#if !defined(__CFA_NO_STATISTICS__)
	718	void print_halts( processor & this ) {
	719	this.print_halts = true;
	720	}
[58688bf]	721
	722	void print_stats_now( cluster & this, int flags ) {
[1b033b8]	723	__print_stats( this.stats, this.print_stats, "Cluster", this.name, (void*)&this );
	724	}
	725
	726	extern int __print_alarm_stats;
	727	void print_alarm_stats() {
	728	__print_alarm_stats = -1;
[58688bf]	729	}
[c34ebf2]	730	#endif
[8118303]	731	// Local Variables: //
	732	// mode: c //
	733	// tab-width: 4 //
	734	// End: //

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