source: libcfa/src/concurrency/kernel.hfa@ 930e57e

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 930e57e was c402739f, checked in by Thierry Delisle <tdelisle@…>, 5 years ago

I/O operations now use futures.
io calls implementation are now generated at configure time.
  • Property mode set to 100644
File size: 9.0 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 --
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 <linux/types.h>
27}
28
29//-----------------------------------------------------------------------------
30// Locks
31struct semaphore {
32 __spinlock_t lock;
33 int count;
34 __queue_t($thread) waiting;
35};
36
37void ?{}(semaphore & this, int count = 1);
38void ^?{}(semaphore & this);
39bool P (semaphore & this);
40bool V (semaphore & this);
41bool V (semaphore & this, unsigned count);
42
43
44//-----------------------------------------------------------------------------
45// Processor
46extern struct cluster * mainCluster;
47
48// Processor id, required for scheduling threads
49struct __processor_id_t {
50 unsigned id;
51
52 #if !defined(__CFA_NO_STATISTICS__)
53 struct __stats_t * stats;
54 #endif
55};
56
57coroutine processorCtx_t {
58 struct processor * proc;
59};
60
61// Wrapper around kernel threads
62struct __attribute__((aligned(128))) processor {
63 // Main state
64 inline __processor_id_t;
65
66 // Cluster from which to get threads
67 struct cluster * cltr;
68
69 // Set to true to notify the processor should terminate
70 volatile bool do_terminate;
71
72 // Coroutine ctx who does keeps the state of the processor
73 struct processorCtx_t runner;
74
75 // Name of the processor
76 const char * name;
77
78 // Handle to pthreads
79 pthread_t kernel_thread;
80
81 // RunThread data
82 // Action to do after a thread is ran
83 $thread * destroyer;
84
85 // Preemption data
86 // Node which is added in the discrete event simulaiton
87 struct alarm_node_t * preemption_alarm;
88
89 // If true, a preemption was triggered in an unsafe region, the processor must preempt as soon as possible
90 bool pending_preemption;
91
92 // Idle lock (kernel semaphore)
93 __bin_sem_t idle;
94
95 // Termination synchronisation (user semaphore)
96 semaphore terminated;
97
98 // pthread Stack
99 void * stack;
100
101 // Link lists fields
102 DLISTED_MGD_IMPL_IN(processor)
103
104 #if !defined(__CFA_NO_STATISTICS__)
105 int print_stats;
106 bool print_halts;
107 #endif
108
109#ifdef __CFA_DEBUG__
110 // Last function to enable preemption on this processor
111 const char * last_enable;
112#endif
113};
114
115void ?{}(processor & this, const char name[], struct cluster & cltr);
116void ^?{}(processor & this);
117
118static inline void ?{}(processor & this) { this{ "Anonymous Processor", *mainCluster}; }
119static inline void ?{}(processor & this, struct cluster & cltr) { this{ "Anonymous Processor", cltr}; }
120static inline void ?{}(processor & this, const char name[]) { this{name, *mainCluster }; }
121
122DLISTED_MGD_IMPL_OUT(processor)
123
124//-----------------------------------------------------------------------------
125// I/O
126struct __io_data;
127
128// IO poller user-thread
129// Not using the "thread" keyword because we want to control
130// more carefully when to start/stop it
131struct $io_ctx_thread {
132 struct __io_data * ring;
133 single_sem sem;
134 volatile bool done;
135 $thread self;
136};
137
138
139struct io_context {
140 $io_ctx_thread thrd;
141};
142
143struct io_context_params {
144 int num_entries;
145 int num_ready;
146 int submit_aff;
147 bool eager_submits:1;
148 bool poller_submits:1;
149 bool poll_submit:1;
150 bool poll_complete:1;
151};
152
153void ?{}(io_context_params & this);
154
155void ?{}(io_context & this, struct cluster & cl);
156void ?{}(io_context & this, struct cluster & cl, const io_context_params & params);
157void ^?{}(io_context & this);
158
159struct io_cancellation {
160 __u64 target;
161};
162
163static inline void ?{}(io_cancellation & this) { this.target = -1u; }
164static inline void ^?{}(io_cancellation & this) {}
165bool cancel(io_cancellation & this);
166
167//-----------------------------------------------------------------------------
168// Cluster Tools
169
170// Intrusives lanes which are used by the relaxed ready queue
171struct __attribute__((aligned(128))) __intrusive_lane_t;
172void ?{}(__intrusive_lane_t & this);
173void ^?{}(__intrusive_lane_t & this);
174
175// Counter used for wether or not the lanes are all empty
176struct __attribute__((aligned(128))) __snzi_node_t;
177struct __snzi_t {
178 unsigned mask;
179 int root;
180 __snzi_node_t * nodes;
181};
182
183void ?{}( __snzi_t & this, unsigned depth );
184void ^?{}( __snzi_t & this );
185
186//TODO adjust cache size to ARCHITECTURE
187// Structure holding the relaxed ready queue
188struct __ready_queue_t {
189 // Data tracking how many/which lanes are used
190 // Aligned to 128 for cache locality
191 __snzi_t snzi;
192
193 // Data tracking the actual lanes
194 // On a seperate cacheline from the used struct since
195 // used can change on each push/pop but this data
196 // only changes on shrink/grow
197 struct {
198 // Arary of lanes
199 __intrusive_lane_t * volatile data;
200
201 // Number of lanes (empty or not)
202 volatile size_t count;
203 } lanes;
204};
205
206void ?{}(__ready_queue_t & this);
207void ^?{}(__ready_queue_t & this);
208
209// Idle Sleep
210struct __cluster_idles {
211 // Spin lock protecting the queue
212 volatile uint64_t lock;
213
214 // Total number of processors
215 unsigned total;
216
217 // Total number of idle processors
218 unsigned idle;
219
220 // List of idle processors
221 dlist(processor, processor) list;
222};
223
224//-----------------------------------------------------------------------------
225// Cluster
226struct __attribute__((aligned(128))) cluster {
227 // Ready queue for threads
228 __ready_queue_t ready_queue;
229
230 // Name of the cluster
231 const char * name;
232
233 // Preemption rate on this cluster
234 Duration preemption_rate;
235
236 // List of idle processors
237 __cluster_idles idles;
238
239 // List of threads
240 __spinlock_t thread_list_lock;
241 __dllist_t(struct $thread) threads;
242 unsigned int nthreads;
243
244 // Link lists fields
245 struct __dbg_node_cltr {
246 cluster * next;
247 cluster * prev;
248 } node;
249
250 struct {
251 io_context * ctxs;
252 unsigned cnt;
253 } io;
254
255 #if !defined(__CFA_NO_STATISTICS__)
256 struct __stats_t * stats;
257 int print_stats;
258 #endif
259};
260extern Duration default_preemption();
261
262void ?{} (cluster & this, const char name[], Duration preemption_rate, unsigned num_io, const io_context_params & io_params);
263void ^?{}(cluster & this);
264
265static inline void ?{} (cluster & this) { io_context_params default_params; this{"Anonymous Cluster", default_preemption(), 1, default_params}; }
266static inline void ?{} (cluster & this, Duration preemption_rate) { io_context_params default_params; this{"Anonymous Cluster", preemption_rate, 1, default_params}; }
267static inline void ?{} (cluster & this, const char name[]) { io_context_params default_params; this{name, default_preemption(), 1, default_params}; }
268static inline void ?{} (cluster & this, unsigned num_io) { io_context_params default_params; this{"Anonymous Cluster", default_preemption(), num_io, default_params}; }
269static inline void ?{} (cluster & this, Duration preemption_rate, unsigned num_io) { io_context_params default_params; this{"Anonymous Cluster", preemption_rate, num_io, default_params}; }
270static inline void ?{} (cluster & this, const char name[], unsigned num_io) { io_context_params default_params; this{name, default_preemption(), num_io, default_params}; }
271static inline void ?{} (cluster & this, const io_context_params & io_params) { this{"Anonymous Cluster", default_preemption(), 1, io_params}; }
272static inline void ?{} (cluster & this, Duration preemption_rate, const io_context_params & io_params) { this{"Anonymous Cluster", preemption_rate, 1, io_params}; }
273static inline void ?{} (cluster & this, const char name[], const io_context_params & io_params) { this{name, default_preemption(), 1, io_params}; }
274static inline void ?{} (cluster & this, unsigned num_io, const io_context_params & io_params) { this{"Anonymous Cluster", default_preemption(), num_io, io_params}; }
275static 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}; }
276static inline void ?{} (cluster & this, const char name[], unsigned num_io, const io_context_params & io_params) { this{name, default_preemption(), num_io, io_params}; }
277
278static inline [cluster *&, cluster *& ] __get( cluster & this ) __attribute__((const)) { return this.node.[next, prev]; }
279
280static inline struct processor * active_processor() { return TL_GET( this_processor ); } // UNSAFE
281static inline struct cluster * active_cluster () { return TL_GET( this_processor )->cltr; }
282
283#if !defined(__CFA_NO_STATISTICS__)
284 static inline void print_stats_at_exit( cluster & this, int flags ) {
285 this.print_stats |= flags;
286 }
287
288 static inline void print_stats_at_exit( processor & this, int flags ) {
289 this.print_stats |= flags;
290 }
291
292 void print_halts( processor & this );
293#endif
294
295// Local Variables: //
296// mode: c //
297// tab-width: 4 //
298// End: //
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