Last change
on this file since 413 was 398, checked in by coas-nagasima, 5 years ago |
mbedTLS版Azure IoT Hub接続サンプルのソースコードを追加
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File size:
830 bytes
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[398] | 1 | #include "stdio_impl.h"
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| 2 | #include "pthread_impl.h"
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| 3 |
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| 4 | int __lockfile(FILE *f)
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| 5 | {
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| 6 | int owner, tid = __pthread_self()->tid;
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| 7 | if (f->lock == tid)
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| 8 | return 0;
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| 9 | while ((owner = a_cas(&f->lock, 0, tid)))
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| 10 | __wait(&f->lock, &f->waiters, owner, 1);
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| 11 | return 1;
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| 12 | }
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| 13 |
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| 14 | void __unlockfile(FILE *f)
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| 15 | {
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| 16 | a_store(&f->lock, 0);
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| 17 |
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| 18 | /* The following read is technically invalid under situations
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| 19 | * of self-synchronized destruction. Another thread may have
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| 20 | * called fclose as soon as the above store has completed.
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| 21 | * Nonetheless, since FILE objects always live in memory
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| 22 | * obtained by malloc from the heap, it's safe to assume
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| 23 | * the dereferences below will not fault. In the worst case,
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| 24 | * a spurious syscall will be made. If the implementation of
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| 25 | * malloc changes, this assumption needs revisiting. */
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| 26 |
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| 27 | if (f->waiters) __wake(&f->lock, 1, 1);
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| 28 | }
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