Last change
on this file since 403 was 337, checked in by coas-nagasima, 6 years ago |
ASP3版ECNLを追加
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Property svn:eol-style
set to
native
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Property svn:mime-type
set to
text/x-csrc;charset=UTF-8
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File size:
366 bytes
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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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