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Developing an Application [3]
The Cray XMT compiler recognizes the following generic read functions.
readfe(&v)
Returns the value of variable v when v is in a full state and sets v
to an empty state. This allows one or more threads waiting for v to
change to an empty state to resume execution. If v is in an empty
state, the read operation is blocked until v changes to a full state.
This generic function behaves like a read access to a sync variable.
readff(&v)
Returns the value of variable v when v is in a full state and leaves v
in a full state. If v is in an empty state, the read operation is blocked
until v changes to a full state. This generic function behaves like a
read access to a future variable.
readxx(&v)
Returns the value of variable v but does not interact with the
full-empty memory state.
touch(&v)
The touch function returns the value of future variable v, where
v is associated with a future statement that has been spawned, but
whose body may or may not have already begun execution. If the
future body that writes v has not begun executing, the thread calling
touch executes the future body. If the future body associated with v
is currently being executed or has finished executing, touch(&v)
acts like a readff(&v) function.
You use the touch function with future variables that are filled
by the execution of code in the body of a future statement. Using
Futures in an Application on page 31 Touching a future variable
that is in an empty state but not bound to a future results in an
execution-time error.
For more information, see the generics(1) man page.
S–2479–20 23
- S–2479–20 1
- Changes to this Document 5
- Compiler Overview [7] 75 8
- S–2479–20 9 9
- Glossary 167 10
- Procedures 10
- Examples 10
- Contents 11
- S–2479–20 11 11
- Introduction [1] 13
- 14 S–2479–20 14
- 2.1 Setting Up a Secure Shell 15
- 2.1.2 Additional Information 16
- 2.2 Using Modules 17
- 2.2.3 Module Commands 18
- Developing an Application [3] 19
- 3.2.1 Generic Functions 20
- S–2479–20 21 21
- 22 S–2479–20 22
- S–2479–20 23 23
- 3.2.2 Intrinsic Functions 24
- 3.3.2 Avoiding Deadlock 25
- 30 S–2479–20 30
- 3.5.2 Anonymous futures 34
- 3.7 File I/O 36
- 3.7.2 System-level I/O 39
- S–2479–20 43 43
- 44 S–2479–20 44
- 3.9 Debugging the Program 45
- 46 S–2479–20 46
- 48 S–2479–20 48
- 4.2 Persisting Shared Memory 49
- 52 S–2479–20 52
- S–2479–20 53 53
- 54 S–2479–20 54
- S–2479–20 55 55
- 56 S–2479–20 56
- 5.5 LUC Client/Server Example 60
- 5.6 Fast I/O Memory Usage 65
- 66 S–2479–20 66
- Library [6] 67
- a file at which to 68
- a file from which to 68
- in the file, a pointer 69
- 70 S–2479–20 70
- 6.4 Examples 71
- 74 S–2479–20 74
- Compiler Overview [7] 75
- 7.1 The Compilation Process 76
- S–2479–20 77 77
- Whole-program Compilation 78
- Separate-module Compilation 78
- S–2479–20 79 79
- 7.2 Invoking the Compiler 80
- 7.3 Setting the Compiler Mode 80
- 7.3.1 Whole-program Mode 81
- 7.3.2 Separate-module Mode 82
- 7.3.3 Mixed Mode 83
- 7.4 Inlining Functions 84
- S–2479–20 85 85
- 86 S–2479–20 86
- 7.7 Creating New Libraries 87
- 7.8 Compiler Messages 88
- #define NUMSTREAMS 40 89
- S–2479–20 89 89
- 90 S–2479–20 90
- Running an Application [8] 91
- 8.3 Improving Performance 93
- 94 S–2479–20 94
- Optional Optimizations [9] 95
- 100 S–2479–20 100
- Error Messages [A] 101
- S–2479–20 101 101
- 102 S–2479–20 102
- User Runtime Functions [B] 103
- 104 S–2479–20 104
- S–2479–20 105 105
- 106 S–2479–20 106
- S–2479–20 107 107
- 108 S–2479–20 108
- C.1 Compilation Directives 109
- 110 S–2479–20 110
- 114 S–2479–20 114
- S–2479–20 115 115
- S–2479–20 119 119
- S–2479–20 121 121
- 124 S–2479–20 124
- C.3 Semantic Assertions 125
- 126 S–2479–20 126
- C.4 Implementation Hints 130
- S–2479–20 131 131
- 132 S–2479–20 132
- Condition Codes [D] 133
- 134 S–2479–20 134
- S–2479–20 135 135
- 136 S–2479–20 136
- Data Types [E] 137
- 138 S–2479–20 138
- Keywords [F] 139
- 140 S–2479–20 140
- S–2479–20 141 141
- 142 S–2479–20 142
- MTA_PARAMS [G] 143
- 144 S–2479–20 144
- S–2479–20 145 145
- 146 S–2479–20 146
- LUC API Reference [H] 147
- H.3 LUC Methods 149
- H.3.2 stopService Method 150
- H.3.3 getMyEndpointID Method 150
- H.3.4 remoteCall Method 151
- 152 S–2479–20 152
- H.3.5 remoteCallSync Method 153
- 154 S–2479–20 154
- H.3.7 setConfigValue Method 155
- 156 S–2479–20 156
- S–2479–20 157 157
- H.3.8 getConfigValue Method 158
- H.4 LUC Type Definitions 159
- H.5 LUC Callback Functions 160
- S–2479–20 161 161
- H.6 LUC Return Codes 162
- S–2479–20 163 163
- 164 S–2479–20 164
- S–2479–20 165 165
- 166 S–2479–20 166
- Glossary 167
- 168 S–2479–20 168
- S–2479–20 169 169
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