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:
254 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_trywait(sem_t *sem)
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| 5 | {
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| 6 | int val;
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| 7 | while ((val=sem->__val[0]) > 0) {
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| 8 | int new = val-1-(val==1 && sem->__val[1]);
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| 9 | if (a_cas(sem->__val, val, new)==val) return 0;
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| 10 | }
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| 11 | errno = EAGAIN;
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| 12 | return -1;
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| 13 | }
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