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 | // monitor -- |
---|
8 | // |
---|
9 | // Author : Thierry Delisle |
---|
10 | // Created On : Thd Feb 23 12:27:26 2017 |
---|
11 | // Last Modified By : Peter A. Buhr |
---|
12 | // Last Modified On : Sat Oct 7 18:06:45 2017 |
---|
13 | // Update Count : 10 |
---|
14 | // |
---|
15 | |
---|
16 | #pragma once |
---|
17 | |
---|
18 | #include <stddef.h> |
---|
19 | |
---|
20 | #include <assert.h> |
---|
21 | #include "invoke.h" |
---|
22 | #include "stdlib" |
---|
23 | |
---|
24 | trait is_monitor(dtype T) { |
---|
25 | monitor_desc * get_monitor( T & ); |
---|
26 | void ^?{}( T & mutex ); |
---|
27 | }; |
---|
28 | |
---|
29 | static inline void ?{}(monitor_desc & this) { |
---|
30 | (this.lock){}; |
---|
31 | (this.entry_queue){}; |
---|
32 | (this.signal_stack){}; |
---|
33 | this.owner = NULL; |
---|
34 | this.recursion = 0; |
---|
35 | this.mask.accepted = NULL; |
---|
36 | this.mask.clauses = NULL; |
---|
37 | this.mask.size = 0; |
---|
38 | this.dtor_node = NULL; |
---|
39 | } |
---|
40 | |
---|
41 | struct monitor_guard_t { |
---|
42 | monitor_desc ** m; |
---|
43 | __lock_size_t count; |
---|
44 | monitor_desc ** prev_mntrs; |
---|
45 | __lock_size_t prev_count; |
---|
46 | fptr_t prev_func; |
---|
47 | }; |
---|
48 | |
---|
49 | void ?{}( monitor_guard_t & this, monitor_desc ** m, __lock_size_t count, void (*func)() ); |
---|
50 | void ^?{}( monitor_guard_t & this ); |
---|
51 | |
---|
52 | struct monitor_dtor_guard_t { |
---|
53 | monitor_desc * m; |
---|
54 | monitor_desc ** prev_mntrs; |
---|
55 | __lock_size_t prev_count; |
---|
56 | fptr_t prev_func; |
---|
57 | }; |
---|
58 | |
---|
59 | void ?{}( monitor_dtor_guard_t & this, monitor_desc ** m, void (*func)() ); |
---|
60 | void ^?{}( monitor_dtor_guard_t & this ); |
---|
61 | |
---|
62 | static inline forall( dtype T | sized(T) | { void ^?{}( T & mutex ); } ) |
---|
63 | void delete( T * th ) { |
---|
64 | ^(*th){}; |
---|
65 | free( th ); |
---|
66 | } |
---|
67 | |
---|
68 | //----------------------------------------------------------------------------- |
---|
69 | // Internal scheduling |
---|
70 | |
---|
71 | struct __condition_criterion_t { |
---|
72 | // Whether or not the criterion is met (True if met) |
---|
73 | bool ready; |
---|
74 | |
---|
75 | // The monitor this criterion concerns |
---|
76 | monitor_desc * target; |
---|
77 | |
---|
78 | // The parent node to which this criterion belongs |
---|
79 | struct __condition_node_t * owner; |
---|
80 | |
---|
81 | // Intrusive linked list Next field |
---|
82 | __condition_criterion_t * next; |
---|
83 | }; |
---|
84 | |
---|
85 | struct __condition_node_t { |
---|
86 | // Thread that needs to be woken when all criteria are met |
---|
87 | thread_desc * waiting_thread; |
---|
88 | |
---|
89 | // Array of criteria (Criterions are contiguous in memory) |
---|
90 | __condition_criterion_t * criteria; |
---|
91 | |
---|
92 | // Number of criterions in the criteria |
---|
93 | __lock_size_t count; |
---|
94 | |
---|
95 | // Intrusive linked list Next field |
---|
96 | __condition_node_t * next; |
---|
97 | |
---|
98 | // Custom user info accessible before signalling |
---|
99 | uintptr_t user_info; |
---|
100 | }; |
---|
101 | |
---|
102 | struct __condition_blocked_queue_t { |
---|
103 | __condition_node_t * head; |
---|
104 | __condition_node_t ** tail; |
---|
105 | }; |
---|
106 | |
---|
107 | void ?{}(__condition_node_t & this, thread_desc * waiting_thread, __lock_size_t count, uintptr_t user_info ); |
---|
108 | void ?{}(__condition_criterion_t & this ); |
---|
109 | void ?{}(__condition_criterion_t & this, monitor_desc * target, __condition_node_t * owner ); |
---|
110 | |
---|
111 | void ?{}( __condition_blocked_queue_t & ); |
---|
112 | void append( __condition_blocked_queue_t &, __condition_node_t * ); |
---|
113 | __condition_node_t * pop_head( __condition_blocked_queue_t & ); |
---|
114 | |
---|
115 | struct condition { |
---|
116 | // Link list which contains the blocked threads as-well as the information needed to unblock them |
---|
117 | __condition_blocked_queue_t blocked; |
---|
118 | |
---|
119 | // Array of monitor pointers (Monitors are NOT contiguous in memory) |
---|
120 | monitor_desc ** monitors; |
---|
121 | |
---|
122 | // Number of monitors in the array |
---|
123 | __lock_size_t monitor_count; |
---|
124 | }; |
---|
125 | |
---|
126 | static inline void ?{}( condition & this ) { |
---|
127 | this.monitors = NULL; |
---|
128 | this.monitor_count = 0; |
---|
129 | } |
---|
130 | |
---|
131 | static inline void ^?{}( condition & this ) { |
---|
132 | free( this.monitors ); |
---|
133 | } |
---|
134 | |
---|
135 | void wait ( condition & this, uintptr_t user_info = 0 ); |
---|
136 | bool signal ( condition & this ); |
---|
137 | bool signal_block( condition & this ); |
---|
138 | static inline bool is_empty ( condition & this ) { return !this.blocked.head; } |
---|
139 | uintptr_t front ( condition & this ); |
---|
140 | |
---|
141 | //----------------------------------------------------------------------------- |
---|
142 | // External scheduling |
---|
143 | |
---|
144 | struct __acceptable_t { |
---|
145 | __monitor_group_t; |
---|
146 | bool is_dtor; |
---|
147 | }; |
---|
148 | |
---|
149 | void __waitfor_internal( const __waitfor_mask_t & mask, int duration ); |
---|
150 | |
---|
151 | // Local Variables: // |
---|
152 | // mode: c // |
---|
153 | // tab-width: 4 // |
---|
154 | // End: // |
---|