source: libcfa/src/concurrency/kernel.hfa @ 8cd5434

arm-ehenumforall-pointer-decayjacob/cs343-translationnew-ast-unique-exprpthread-emulationqualifiedEnum
Last change on this file since 8cd5434 was 8cd5434, checked in by Thierry Delisle <tdelisle@…>, 19 months ago

Added function to poll ready-queue length.
Not officially supported.

  • Property mode set to 100644
File size: 8.6 KB
Line 
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#ifdef __CFA_WITH_VERIFY__
31        extern bool __cfaabi_dbg_in_kernel();
32#endif
33
34//-----------------------------------------------------------------------------
35// I/O
36struct cluster;
37struct $io_context;
38struct $io_arbiter;
39
40struct io_context_params {
41        int num_entries;
42};
43
44void  ?{}(io_context_params & this);
45
46//-----------------------------------------------------------------------------
47// Processor
48extern struct cluster * mainCluster;
49
50// Processor id, required for scheduling threads
51
52
53coroutine processorCtx_t {
54        struct processor * proc;
55};
56
57// Wrapper around kernel threads
58struct __attribute__((aligned(128))) processor {
59        // Cluster from which to get threads
60        struct cluster * cltr;
61
62        // Ready Queue state per processor
63        struct {
64                unsigned short its;
65                unsigned short itr;
66                unsigned id;
67                unsigned target;
68                unsigned long long int cutoff;
69        } rdq;
70
71        // Set to true to notify the processor should terminate
72        volatile bool do_terminate;
73
74        // Coroutine ctx who does keeps the state of the processor
75        struct processorCtx_t runner;
76
77        // Name of the processor
78        const char * name;
79
80        // Handle to pthreads
81        pthread_t kernel_thread;
82
83        // Unique id for the processor (not per cluster)
84        unsigned unique_id;
85
86        struct {
87                $io_context * ctx;
88                bool pending;
89                bool dirty;
90        } io;
91
92        // Preemption data
93        // Node which is added in the discrete event simulaiton
94        struct alarm_node_t * preemption_alarm;
95
96        // If true, a preemption was triggered in an unsafe region, the processor must preempt as soon as possible
97        bool pending_preemption;
98
99        // Idle lock (kernel semaphore)
100        int idle;
101
102        // Termination synchronisation (user semaphore)
103        oneshot terminated;
104
105        // pthread Stack
106        void * stack;
107
108        // Link lists fields
109        DLISTED_MGD_IMPL_IN(processor)
110
111        // special init fields
112        // This is needed for memcached integration
113        // once memcached experiments are done this should probably be removed
114        // it is not a particularly safe scheme as it can make processors less homogeneous
115        struct {
116                $thread * thrd;
117        } init;
118
119        struct KernelThreadData * local_data;
120
121        #if !defined(__CFA_NO_STATISTICS__)
122                int print_stats;
123                bool print_halts;
124        #endif
125
126#ifdef __CFA_DEBUG__
127        // Last function to enable preemption on this processor
128        const char * last_enable;
129#endif
130};
131
132void  ?{}(processor & this, const char name[], struct cluster & cltr);
133void ^?{}(processor & this);
134
135static inline void  ?{}(processor & this)                        { this{ "Anonymous Processor", *mainCluster}; }
136static inline void  ?{}(processor & this, struct cluster & cltr) { this{ "Anonymous Processor", cltr}; }
137static inline void  ?{}(processor & this, const char name[])     { this{name, *mainCluster}; }
138
139DLISTED_MGD_IMPL_OUT(processor)
140
141//-----------------------------------------------------------------------------
142// Cluster Tools
143
144// Intrusives lanes which are used by the ready queue
145struct __attribute__((aligned(128))) __intrusive_lane_t;
146void  ?{}(__intrusive_lane_t & this);
147void ^?{}(__intrusive_lane_t & this);
148
149// Aligned timestamps which are used by the relaxed ready queue
150struct __attribute__((aligned(128))) __timestamp_t {
151        volatile unsigned long long tv;
152};
153
154static inline void  ?{}(__timestamp_t & this) { this.tv = 0; }
155static inline void ^?{}(__timestamp_t & this) {}
156
157//TODO adjust cache size to ARCHITECTURE
158// Structure holding the relaxed ready queue
159struct __ready_queue_t {
160        // Data tracking the actual lanes
161        // On a seperate cacheline from the used struct since
162        // used can change on each push/pop but this data
163        // only changes on shrink/grow
164        struct {
165                // Arary of lanes
166                __intrusive_lane_t * volatile data;
167
168                // Array of times
169                __timestamp_t * volatile tscs;
170
171                // Number of lanes (empty or not)
172                volatile size_t count;
173        } lanes;
174};
175
176void  ?{}(__ready_queue_t & this);
177void ^?{}(__ready_queue_t & this);
178#if !defined(__CFA_NO_STATISTICS__)
179        unsigned cnt(const __ready_queue_t & this, unsigned idx);
180#endif
181
182// Idle Sleep
183struct __cluster_proc_list {
184        // Spin lock protecting the queue
185        volatile uint64_t lock;
186
187        // Total number of processors
188        unsigned total;
189
190        // Total number of idle processors
191        unsigned idle;
192
193        // List of idle processors
194        dlist(processor, processor) idles;
195
196        // List of active processors
197        dlist(processor, processor) actives;
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_proc_list procs;
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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