̾??

pthread_rwlock_rdlock, pthread_rwlock_tryrdlock — ?ɼ????Ѥ??ɼ??? / ?????ߥ??å??γ???

?饤?֥???

Reentrant C Library (libc_r, -lc_r)

????

<pthread.h> int pthread_rwlock_rdlock(pthread_rwlock_t *lock) int pthread_rwlock_tryrdlock(pthread_rwlock_t *lock)

????

pthread_rwlock_rdlock() ?ؿ??ϡ? lock ??Ϳ?????줿?????å??????߽??????Ѥ??ݻ??????Ƥ??餺???????ߥ????åɤ? ???ߤ??Υ??å??ǥ֥??å??????Ƥ??ʤ????ɼ????ѤΥ??å??????????ޤ??? ?ɼ????ѤΥ??å??򤹤??˳????Ǥ??ʤ??????ˤϡ??ƤӽФ??Ƥ??륹???åɤ? ???Υ??å????????Ǥ????ޤǥ֥??å????ޤ???

pthread_rwlock_tryrdlock() ?ؿ??ϡ?Ʊ?????????¹Ԥ??ޤ??????????˥??å????????Ǥ??ʤ? (???ʤ????? ???å??????????Ѥ??ݻ??????Ƥ??롢 ?ޤ????ԤäƤ????????ߥ????åɤ?????) ?????ˤϡ??֥??å????ޤ?????

1 ?ĤΥ????åɤ?ʣ????Ʊ?????ɼ????ѥ??å????ݻ????뤳?Ȥ??Ǥ??ޤ??? ???ξ????ˤϡ??ġ??γ??????줿?Τ????? pthread_rwlock_unlock() ?? 1 ?٤??ĸƤӽФ????ʤ????Фʤ??ޤ?????

?ƤӽФ??Ƥ??륹???åɤ????????ѤΥ??å????ݻ????Ƥ????֤Ρ? ?ɼ????ѤΥ??å??γ????η??̤ϡ?̤?????Ǥ???

?????˴ؤ?????

??????¦?ε??????֤??ɤ????ᡢ??????¦???ɹ???¦??????ͥ?褵???ޤ???

??????

???꤬?ʤ??????ϡ? pthread_rwlock_rdlock() ?????? pthread_rwlock_tryrdlock() ?ؿ??? 0 ???֤??ޤ??? ???꤬?????????ϡ????Υ??顼?򼨤??????˥??顼?ֹ椬?֤????ޤ???

??Ϣ????

pthread_rwlock_init(3), pthread_rwlock_trywrlock(3), pthread_rwlock_unlock(3), pthread_rwlock_wrlock(3)

????

pthread_rwlock_rdlock() ?????? pthread_rwlock_tryrdlock() ?ؿ??ϡ? Version 2 of the Single UNIX Specification (“SUSv2”) ??Ŭ?礷?Ƥ????Ϥ??Ǥ???

???顼

pthread_rwlock_tryrdlock() ?ؿ??ϡ??ʲ??ξ????˼??Ԥ??ޤ???

[EBUSY]

?????ߥ????åɤ????å????ݻ????Ƥ??롢?ޤ??ϥ֥??å??????Ƥ??뤿?ᡢ ???å????????Ǥ??ޤ?????

pthread_rwlock_rdlock() ?????? pthread_rwlock_tryrdlock() ?ؿ??ϡ??ʲ??ξ????˼??Ԥ??뤳?Ȥ??????ޤ???

[EAGAIN]

lock ???Ф????ɼ????ѤΥ??å??κ??????????˱ۤ??Ƥ??뤿?ᡢ ???å????????Ǥ??ޤ?????

[EDEADLK]

???ߤΥ????åɤ????˽??????Ѥ? lock ????ͭ???Ƥ??ޤ???

[EINVAL]

lock ?ˤ??äƻ??ꤵ?줿?ͤ?̵???Ǥ???

[ENOMEM]

???å? (??Ū?˽????????줿???å??Τߤ?Ŭ??) ?ν??????Τ????? ??ʬ?ʥ????꤬?????ޤ?????

????

pthread_rwlock_rdlock() ?ؿ??ϡ? FreeBSD 3.0 ?ǤϤ??????о줷?ޤ?????