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:
366 bytes
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[398] | 1 | #include <semaphore.h>
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| 2 | #include "pthread_impl.h"
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| 3 |
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| 4 | int sem_post(sem_t *sem)
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| 5 | {
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| 6 | int val, waiters, priv = sem->__val[2];
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| 7 | do {
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| 8 | val = sem->__val[0];
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| 9 | waiters = sem->__val[1];
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| 10 | if (val == SEM_VALUE_MAX) {
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| 11 | errno = EOVERFLOW;
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| 12 | return -1;
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| 13 | }
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| 14 | } while (a_cas(sem->__val, val, val+1+(val<0)) != val);
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| 15 | if (val<0 || waiters) __wake(sem->__val, 1, priv);
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| 16 | return 0;
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| 17 | }
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