1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
/*
cs_par_structs.h:
Copyright (C) 2011 John ffitch and Chris Wilson
2013 John ffitch and Martin Brain
This file is part of Csound.
The Csound Library is free software; you can redistribute it
and/or modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
Csound is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with Csound; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301 USA
*/
#ifndef __CS_PAR_DISPATCH_H
#define __CS_PAR_DISPATCH_H
/* global variables lock support */
struct global_var_lock_t;
struct instr_semantics_t;
/* New model */
/* Current memory subsystems work at the granularity of cache lines.
* Thus concurrent accesses to multiple objects within a cache line
* can cause additional conflicts and memory subsystem traffic.
* The best way to avoid this is to pad the structures so that they don't
* share a cache line. 64 bytes seems to be becoming the usual cache line
* size. If the actual line is smaller, it will waste a little memory but
* shouldn't affect the sharing. If the actual line is larger then it may
* cause a few conflicts and thus a performance hit. Unless you are
* using a very unusual machine and you happen to know it's cache line size
* then leave this as 64, although you can try 32 or maybe even 16.
*/
#define CONCURRENTPADDING 64
typedef int taskID;
/* Each task has a status */
enum state { WAITING = 3, /* Dependencies have not been finished */
AVAILABLE = 2, /* Dependencies met, ready to be run */
INPROGRESS = 1, /* Has been started */
DONE = 0 }; /* Has been completed */
typedef struct _stateWithPadding {
enum state s;
uint8_t padding [(CONCURRENTPADDING - sizeof(enum state)) / sizeof(uint8_t)];
} stateWithPadding;
/* Sets of prerequiste tasks for each task */
typedef struct _watchList {
taskID id;
struct _watchList *next;
uint8_t padding [(CONCURRENTPADDING -
(sizeof(taskID) +
sizeof(struct _watchList *))) / sizeof(uint8_t)];
} watchList;
#endif
|
