source: libcfa/src/concurrency/kernel.hfa @ e46c753

arm-ehjacob/cs343-translationnew-astnew-ast-unique-expr
Last change on this file since e46c753 was e46c753, checked in by Thierry Delisle <tdelisle@…>, 16 months ago

Added new io algorithm that eagerly submits while still helping

  • Property mode set to 100644
File size: 6.7 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 <stdbool.h>
19#include <stdint.h>
20
21#include "invoke.h"
22#include "time_t.hfa"
23#include "coroutine.hfa"
24
25#include "containers/stackLockFree.hfa"
26
27extern "C" {
28#include <pthread.h>
29#include <semaphore.h>
30}
31
32//-----------------------------------------------------------------------------
33// Locks
34struct semaphore {
35        __spinlock_t lock;
36        int count;
37        __queue_t($thread) waiting;
38};
39
40void  ?{}(semaphore & this, int count = 1);
41void ^?{}(semaphore & this);
42bool   P (semaphore & this);
43bool   V (semaphore & this);
44bool   V (semaphore & this, unsigned count);
45
46
47//-----------------------------------------------------------------------------
48// Processor
49extern struct cluster * mainCluster;
50
51// Processor id, required for scheduling threads
52struct __processor_id_t {
53        unsigned id;
54
55        #if !defined(__CFA_NO_STATISTICS__)
56                struct __stats_t * stats;
57        #endif
58};
59
60coroutine processorCtx_t {
61        struct processor * proc;
62};
63
64// Wrapper around kernel threads
65struct __attribute__((aligned(128))) processor {
66        // Main state
67        inline __processor_id_t;
68
69        // Cluster from which to get threads
70        struct cluster * cltr;
71
72        // Set to true to notify the processor should terminate
73        volatile bool do_terminate;
74
75        // Coroutine ctx who does keeps the state of the processor
76        struct processorCtx_t runner;
77
78        // Name of the processor
79        const char * name;
80
81        // Handle to pthreads
82        pthread_t kernel_thread;
83
84        // RunThread data
85        // Action to do after a thread is ran
86        $thread * destroyer;
87
88        // Preemption data
89        // Node which is added in the discrete event simulaiton
90        struct alarm_node_t * preemption_alarm;
91
92        // If true, a preemption was triggered in an unsafe region, the processor must preempt as soon as possible
93        bool pending_preemption;
94
95        // Idle lock (kernel semaphore)
96        __bin_sem_t idle;
97
98        // Termination synchronisation (user semaphore)
99        semaphore terminated;
100
101        // pthread Stack
102        void * stack;
103
104        // Link lists fields
105        Link(processor) link;
106
107        #if !defined(__CFA_NO_STATISTICS__)
108                int print_stats;
109                bool print_halts;
110        #endif
111
112#ifdef __CFA_DEBUG__
113        // Last function to enable preemption on this processor
114        const char * last_enable;
115#endif
116};
117
118void  ?{}(processor & this, const char name[], struct cluster & cltr);
119void ^?{}(processor & this);
120
121static inline void  ?{}(processor & this)                    { this{ "Anonymous Processor", *mainCluster}; }
122static inline void  ?{}(processor & this, struct cluster & cltr)    { this{ "Anonymous Processor", cltr}; }
123static inline void  ?{}(processor & this, const char name[]) { this{name, *mainCluster }; }
124
125static inline Link(processor) * ?`next( processor * this ) { return &this->link; }
126
127//-----------------------------------------------------------------------------
128// I/O
129struct __io_data;
130
131#define CFA_CLUSTER_IO_POLLER_USER_THREAD    1 << 0 // 0x1
132#define CFA_CLUSTER_IO_POLLER_THREAD_SUBMITS 1 << 1 // 0x2
133#define CFA_CLUSTER_IO_EAGER_SUBMITS         1 << 2 // 0x4
134#define CFA_CLUSTER_IO_BUFFLEN_OFFSET        16
135
136
137//-----------------------------------------------------------------------------
138// Cluster Tools
139
140// Intrusives lanes which are used by the relaxed ready queue
141struct __attribute__((aligned(128))) __intrusive_lane_t;
142void  ?{}(__intrusive_lane_t & this);
143void ^?{}(__intrusive_lane_t & this);
144
145// Counter used for wether or not the lanes are all empty
146struct __attribute__((aligned(128))) __snzi_node_t;
147struct __snzi_t {
148        unsigned mask;
149        int root;
150        __snzi_node_t * nodes;
151};
152
153void  ?{}( __snzi_t & this, unsigned depth );
154void ^?{}( __snzi_t & this );
155
156//TODO adjust cache size to ARCHITECTURE
157// Structure holding the relaxed ready queue
158struct __ready_queue_t {
159        // Data tracking how many/which lanes are used
160        // Aligned to 128 for cache locality
161        __snzi_t snzi;
162
163        // Data tracking the actual lanes
164        // On a seperate cacheline from the used struct since
165        // used can change on each push/pop but this data
166        // only changes on shrink/grow
167        struct {
168                // Arary of lanes
169                __intrusive_lane_t * volatile data;
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
179//-----------------------------------------------------------------------------
180// Cluster
181struct __attribute__((aligned(128))) cluster {
182        // Ready queue for threads
183        __ready_queue_t ready_queue;
184
185        // Name of the cluster
186        const char * name;
187
188        // Preemption rate on this cluster
189        Duration preemption_rate;
190
191        // List of idle processors
192        StackLF(processor) idles;
193        volatile unsigned int nprocessors;
194
195        // List of threads
196        __spinlock_t thread_list_lock;
197        __dllist_t(struct $thread) threads;
198        unsigned int nthreads;
199
200        // Link lists fields
201        struct __dbg_node_cltr {
202                cluster * next;
203                cluster * prev;
204        } node;
205
206        struct __io_data * io;
207
208        #if !defined(__CFA_NO_STATISTICS__)
209                struct __stats_t * stats;
210                int print_stats;
211        #endif
212};
213extern Duration default_preemption();
214
215void ?{} (cluster & this, const char name[], Duration preemption_rate, unsigned flags);
216void ^?{}(cluster & this);
217
218static inline void ?{} (cluster & this)                                           { this{"Anonymous Cluster", default_preemption(), 0}; }
219static inline void ?{} (cluster & this, Duration preemption_rate)                 { this{"Anonymous Cluster", preemption_rate, 0}; }
220static inline void ?{} (cluster & this, const char name[])                        { this{name, default_preemption(), 0}; }
221static inline void ?{} (cluster & this, unsigned flags)                           { this{"Anonymous Cluster", default_preemption(), flags}; }
222static inline void ?{} (cluster & this, Duration preemption_rate, unsigned flags) { this{"Anonymous Cluster", preemption_rate, flags}; }
223static inline void ?{} (cluster & this, const char name[], unsigned flags)        { this{name, default_preemption(), flags}; }
224
225static inline [cluster *&, cluster *& ] __get( cluster & this ) __attribute__((const)) { return this.node.[next, prev]; }
226
227static inline struct processor * active_processor() { return TL_GET( this_processor ); } // UNSAFE
228static inline struct cluster   * active_cluster  () { return TL_GET( this_processor )->cltr; }
229
230#if !defined(__CFA_NO_STATISTICS__)
231        static inline void print_stats_at_exit( cluster & this, int flags ) {
232                this.print_stats |= flags;
233        }
234
235        static inline void print_stats_at_exit( processor & this, int flags ) {
236                this.print_stats |= flags;
237        }
238
239        void print_halts( processor & this );
240#endif
241
242// Local Variables: //
243// mode: c //
244// tab-width: 4 //
245// End: //
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