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

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 78da4ab was 78da4ab, checked in by Thierry Delisle <tdelisle@…>, 5 years 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
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//-----------------------------------------------------------------------------
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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