source: libcfa/src/concurrency/kernel.hfa @ 78da4ab

arm-ehjacob/cs343-translationnew-ast-unique-expr
Last change on this file since 78da4ab was 78da4ab, checked in by Thierry Delisle <tdelisle@…>, 8 months ago

New implementation of io based on instance burrowing.
Trying to avoid the unbounded growth of the previous flat combining approach.

  • Property mode set to 100644
File size: 8.4 KB
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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 -- Header containing the core of the kernel API
8//
9// Author           : Thierry Delisle
10// Created On       : Tue Jan 17 12:27:26 2017
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Tue Feb  4 12:29:26 2020
13// Update Count     : 22
14//
15
16#pragma once
17
18#include "invoke.h"
19#include "time_t.hfa"
20#include "coroutine.hfa"
21
22#include "containers/list.hfa"
23
24extern "C" {
25        #include <bits/pthreadtypes.h>
26        #include <pthread.h>
27        #include <linux/types.h>
28}
29
30//-----------------------------------------------------------------------------
31// Underlying Locks
32#ifdef __CFA_WITH_VERIFY__
33        extern bool __cfaabi_dbg_in_kernel();
34#endif
35
36struct __bin_sem_t {
37        pthread_mutex_t         lock;
38        pthread_cond_t          cond;
39        int                     val;
40};
41
42//-----------------------------------------------------------------------------
43// I/O
44struct cluster;
45struct $io_context;
46struct $io_arbiter;
47
48struct io_context_params {
49        int num_entries;
50};
51
52void  ?{}(io_context_params & this);
53
54struct io_context {
55        $io_context * ctx;
56        cluster * cltr;
57};
58void  ?{}(io_context & this, struct cluster & cl);
59void ^?{}(io_context & this);
60
61//-----------------------------------------------------------------------------
62// Processor
63extern struct cluster * mainCluster;
64
65// Processor id, required for scheduling threads
66struct __processor_id_t {
67        unsigned id:24;
68        bool full_proc:1;
69
70        #if !defined(__CFA_NO_STATISTICS__)
71                struct __stats_t * stats;
72        #endif
73};
74
75coroutine processorCtx_t {
76        struct processor * proc;
77};
78
79// Wrapper around kernel threads
80struct __attribute__((aligned(128))) processor {
81        // Main state
82        inline __processor_id_t;
83
84        // Cluster from which to get threads
85        struct cluster * cltr;
86
87        // Set to true to notify the processor should terminate
88        volatile bool do_terminate;
89
90        // Coroutine ctx who does keeps the state of the processor
91        struct processorCtx_t runner;
92
93        // Name of the processor
94        const char * name;
95
96        // Handle to pthreads
97        pthread_t kernel_thread;
98
99        struct {
100                $io_context * volatile ctx;
101                volatile bool lock;
102        } io;
103
104        // Preemption data
105        // Node which is added in the discrete event simulaiton
106        struct alarm_node_t * preemption_alarm;
107
108        // If true, a preemption was triggered in an unsafe region, the processor must preempt as soon as possible
109        bool pending_preemption;
110
111        // Idle lock (kernel semaphore)
112        __bin_sem_t idle;
113
114        // Termination synchronisation (user semaphore)
115        oneshot terminated;
116
117        // pthread Stack
118        void * stack;
119
120        // Link lists fields
121        DLISTED_MGD_IMPL_IN(processor)
122
123        #if !defined(__CFA_NO_STATISTICS__)
124                int print_stats;
125                bool print_halts;
126        #endif
127
128#ifdef __CFA_DEBUG__
129        // Last function to enable preemption on this processor
130        const char * last_enable;
131#endif
132};
133
134void  ?{}(processor & this, const char name[], struct cluster & cltr);
135void ^?{}(processor & this);
136
137static inline void  ?{}(processor & this)                    { this{ "Anonymous Processor", *mainCluster}; }
138static inline void  ?{}(processor & this, struct cluster & cltr)    { this{ "Anonymous Processor", cltr}; }
139static inline void  ?{}(processor & this, const char name[]) { this{name, *mainCluster }; }
140
141DLISTED_MGD_IMPL_OUT(processor)
142
143//-----------------------------------------------------------------------------
144// Cluster Tools
145
146// Intrusives lanes which are used by the relaxed ready queue
147struct __attribute__((aligned(128))) __intrusive_lane_t;
148void  ?{}(__intrusive_lane_t & this);
149void ^?{}(__intrusive_lane_t & this);
150
151// Counter used for wether or not the lanes are all empty
152struct __attribute__((aligned(128))) __snzi_node_t;
153struct __snzi_t {
154        unsigned mask;
155        int root;
156        __snzi_node_t * nodes;
157};
158
159void  ?{}( __snzi_t & this, unsigned depth );
160void ^?{}( __snzi_t & this );
161
162//TODO adjust cache size to ARCHITECTURE
163// Structure holding the relaxed ready queue
164struct __ready_queue_t {
165        // Data tracking how many/which lanes are used
166        // Aligned to 128 for cache locality
167        __snzi_t snzi;
168
169        // Data tracking the actual lanes
170        // On a seperate cacheline from the used struct since
171        // used can change on each push/pop but this data
172        // only changes on shrink/grow
173        struct {
174                // Arary of lanes
175                __intrusive_lane_t * volatile data;
176
177                // Number of lanes (empty or not)
178                volatile size_t count;
179        } lanes;
180};
181
182void  ?{}(__ready_queue_t & this);
183void ^?{}(__ready_queue_t & this);
184
185// Idle Sleep
186struct __cluster_idles {
187        // Spin lock protecting the queue
188        volatile uint64_t lock;
189
190        // Total number of processors
191        unsigned total;
192
193        // Total number of idle processors
194        unsigned idle;
195
196        // List of idle processors
197        dlist(processor, processor) list;
198};
199
200//-----------------------------------------------------------------------------
201// Cluster
202struct __attribute__((aligned(128))) cluster {
203        // Ready queue for threads
204        __ready_queue_t ready_queue;
205
206        // Name of the cluster
207        const char * name;
208
209        // Preemption rate on this cluster
210        Duration preemption_rate;
211
212        // List of idle processors
213        __cluster_idles idles;
214
215        // List of threads
216        __spinlock_t thread_list_lock;
217        __dllist_t(struct $thread) threads;
218        unsigned int nthreads;
219
220        // Link lists fields
221        struct __dbg_node_cltr {
222                cluster * next;
223                cluster * prev;
224        } node;
225
226        struct {
227                $io_arbiter * arbiter;
228                io_context_params params;
229        } io;
230
231        #if !defined(__CFA_NO_STATISTICS__)
232                struct __stats_t * stats;
233                int print_stats;
234        #endif
235};
236extern Duration default_preemption();
237
238void ?{} (cluster & this, const char name[], Duration preemption_rate, unsigned num_io, const io_context_params & io_params);
239void ^?{}(cluster & this);
240
241static inline void ?{} (cluster & this)                                            { io_context_params default_params;    this{"Anonymous Cluster", default_preemption(), 1, default_params}; }
242static inline void ?{} (cluster & this, Duration preemption_rate)                  { io_context_params default_params;    this{"Anonymous Cluster", preemption_rate, 1, default_params}; }
243static inline void ?{} (cluster & this, const char name[])                         { io_context_params default_params;    this{name, default_preemption(), 1, default_params}; }
244static inline void ?{} (cluster & this, unsigned num_io)                           { io_context_params default_params;    this{"Anonymous Cluster", default_preemption(), num_io, default_params}; }
245static inline void ?{} (cluster & this, Duration preemption_rate, unsigned num_io) { io_context_params default_params;    this{"Anonymous Cluster", preemption_rate, num_io, default_params}; }
246static inline void ?{} (cluster & this, const char name[], unsigned num_io)        { io_context_params default_params;    this{name, default_preemption(), num_io, default_params}; }
247static inline void ?{} (cluster & this, const io_context_params & io_params)                                            { this{"Anonymous Cluster", default_preemption(), 1, io_params}; }
248static inline void ?{} (cluster & this, Duration preemption_rate, const io_context_params & io_params)                  { this{"Anonymous Cluster", preemption_rate, 1, io_params}; }
249static inline void ?{} (cluster & this, const char name[], const io_context_params & io_params)                         { this{name, default_preemption(), 1, io_params}; }
250static inline void ?{} (cluster & this, unsigned num_io, const io_context_params & io_params)                           { this{"Anonymous Cluster", default_preemption(), num_io, io_params}; }
251static inline void ?{} (cluster & this, Duration preemption_rate, unsigned num_io, const io_context_params & io_params) { this{"Anonymous Cluster", preemption_rate, num_io, io_params}; }
252static inline void ?{} (cluster & this, const char name[], unsigned num_io, const io_context_params & io_params)        { this{name, default_preemption(), num_io, io_params}; }
253
254static inline [cluster *&, cluster *& ] __get( cluster & this ) __attribute__((const)) { return this.node.[next, prev]; }
255
256static inline struct processor * active_processor() { return publicTLS_get( this_processor ); } // UNSAFE
257static inline struct cluster   * active_cluster  () { return publicTLS_get( this_processor )->cltr; }
258
259#if !defined(__CFA_NO_STATISTICS__)
260        void print_stats_now( cluster & this, int flags );
261
262        static inline void print_stats_at_exit( cluster & this, int flags ) {
263                this.print_stats |= flags;
264        }
265
266        static inline void print_stats_at_exit( processor & this, int flags ) {
267                this.print_stats |= flags;
268        }
269
270        void print_halts( processor & this );
271#endif
272
273// Local Variables: //
274// mode: c //
275// tab-width: 4 //
276// End: //
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