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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 #ifndef RUNTIME_PLATFORM_SIGNAL_BLOCKER_H_ | 5 #ifndef RUNTIME_PLATFORM_SIGNAL_BLOCKER_H_ |
6 #define RUNTIME_PLATFORM_SIGNAL_BLOCKER_H_ | 6 #define RUNTIME_PLATFORM_SIGNAL_BLOCKER_H_ |
7 | 7 |
8 #include "platform/globals.h" | 8 #include "platform/globals.h" |
9 #include "platform/assert.h" | 9 #include "platform/assert.h" |
10 | 10 |
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50 | 50 |
51 private: | 51 private: |
52 sigset_t old; | 52 sigset_t old; |
53 }; | 53 }; |
54 | 54 |
55 | 55 |
56 // The definition below is copied from Linux and adapted to avoid lint | 56 // The definition below is copied from Linux and adapted to avoid lint |
57 // errors (type long int changed to intptr_t and do/while split on | 57 // errors (type long int changed to intptr_t and do/while split on |
58 // separate lines with body in {}s) and to also block signals. | 58 // separate lines with body in {}s) and to also block signals. |
59 #define TEMP_FAILURE_RETRY(expression) \ | 59 #define TEMP_FAILURE_RETRY(expression) \ |
60 ({ ThreadSignalBlocker tsb(SIGPROF); \ | 60 ({ \ |
61 intptr_t __result; \ | 61 ThreadSignalBlocker tsb(SIGPROF); \ |
62 do { \ | 62 intptr_t __result; \ |
63 __result = (expression); \ | 63 do { \ |
64 } while ((__result == -1L) && (errno == EINTR)); \ | 64 __result = (expression); \ |
65 __result; }) | 65 } while ((__result == -1L) && (errno == EINTR)); \ |
| 66 __result; \ |
| 67 }) |
66 | 68 |
67 // This is a version of TEMP_FAILURE_RETRY which does not use the value | 69 // This is a version of TEMP_FAILURE_RETRY which does not use the value |
68 // returned from the expression. | 70 // returned from the expression. |
69 #define VOID_TEMP_FAILURE_RETRY(expression) \ | 71 #define VOID_TEMP_FAILURE_RETRY(expression) \ |
70 (static_cast<void>(TEMP_FAILURE_RETRY(expression))) | 72 (static_cast<void>(TEMP_FAILURE_RETRY(expression))) |
71 | 73 |
72 // This macro can be used to insert checks that a call is made, that | 74 // This macro can be used to insert checks that a call is made, that |
73 // was expected to not return EINTR, but did it anyway. | 75 // was expected to not return EINTR, but did it anyway. |
74 #define NO_RETRY_EXPECTED(expression) \ | 76 #define NO_RETRY_EXPECTED(expression) \ |
75 ({ intptr_t __result = (expression); \ | 77 ({ \ |
76 if (__result == -1L && errno == EINTR) { \ | 78 intptr_t __result = (expression); \ |
77 FATAL("Unexpected EINTR errno"); \ | 79 if (__result == -1L && errno == EINTR) { \ |
78 } \ | 80 FATAL("Unexpected EINTR errno"); \ |
79 __result; }) | 81 } \ |
| 82 __result; \ |
| 83 }) |
80 | 84 |
81 #define VOID_NO_RETRY_EXPECTED(expression) \ | 85 #define VOID_NO_RETRY_EXPECTED(expression) \ |
82 (static_cast<void>(NO_RETRY_EXPECTED(expression))) | 86 (static_cast<void>(NO_RETRY_EXPECTED(expression))) |
83 | 87 |
84 // Define to check in debug mode, if a signal is currently being blocked. | 88 // Define to check in debug mode, if a signal is currently being blocked. |
85 #define CHECK_IS_BLOCKING(signal) \ | 89 #define CHECK_IS_BLOCKING(signal) \ |
86 ({ sigset_t signal_mask; \ | 90 ({ \ |
87 int __r = pthread_sigmask(SIG_BLOCK, NULL, &signal_mask); \ | 91 sigset_t signal_mask; \ |
88 USE(__r); \ | 92 int __r = pthread_sigmask(SIG_BLOCK, NULL, &signal_mask); \ |
89 ASSERT(__r == 0); \ | 93 USE(__r); \ |
90 sigismember(&signal_mask, signal); }) \ | 94 ASSERT(__r == 0); \ |
| 95 sigismember(&signal_mask, signal); \ |
| 96 }) |
91 | 97 |
92 | 98 |
93 // Versions of the above, that does not enter a signal blocking scope. Use only | 99 // Versions of the above, that does not enter a signal blocking scope. Use only |
94 // when a signal blocking scope is entered manually. | 100 // when a signal blocking scope is entered manually. |
95 #define TEMP_FAILURE_RETRY_NO_SIGNAL_BLOCKER(expression) \ | 101 #define TEMP_FAILURE_RETRY_NO_SIGNAL_BLOCKER(expression) \ |
96 ({ intptr_t __result; \ | 102 ({ \ |
97 ASSERT(CHECK_IS_BLOCKING(SIGPROF)); \ | 103 intptr_t __result; \ |
98 do { \ | 104 ASSERT(CHECK_IS_BLOCKING(SIGPROF)); \ |
99 __result = (expression); \ | 105 do { \ |
100 } while ((__result == -1L) && (errno == EINTR)); \ | 106 __result = (expression); \ |
101 __result; }) | 107 } while ((__result == -1L) && (errno == EINTR)); \ |
| 108 __result; \ |
| 109 }) |
102 | 110 |
103 #define VOID_TEMP_FAILURE_RETRY_NO_SIGNAL_BLOCKER(expression) \ | 111 #define VOID_TEMP_FAILURE_RETRY_NO_SIGNAL_BLOCKER(expression) \ |
104 (static_cast<void>(TEMP_FAILURE_RETRY_NO_SIGNAL_BLOCKER(expression))) | 112 (static_cast<void>(TEMP_FAILURE_RETRY_NO_SIGNAL_BLOCKER(expression))) |
105 | 113 |
106 } // namespace dart | 114 } // namespace dart |
107 | 115 |
108 #endif // RUNTIME_PLATFORM_SIGNAL_BLOCKER_H_ | 116 #endif // RUNTIME_PLATFORM_SIGNAL_BLOCKER_H_ |
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