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pthread_rwlock_init(3)   BSD Library Functions Manual   pthread_rwlock_init(3)


NAME

     pthread_rwlock_init -- initialize a read/write lock


SYNOPSIS

     #include <pthread.h>

     int
     pthread_rwlock_init(pthread_rwlock_t *lock,
         const pthread_rwlockattr_t *attr);


DESCRIPTION

     The pthread_rwlock_init() function is used to initialize a read/write
     lock, with attributes specified by attr.  If attr is NULL, the default
     read/write lock attributes are used.

     The results of calling pthread_rwlock_init() with an already initialized
     lock are undefined.


RETURN VALUES

     If successful, the pthread_rwlock_init() function will return zero.  Oth-
     erwise an error number will be returned to indicate the error.


ERRORS

     The pthread_rwlock_init() function will fail if:

     [EAGAIN]           The system lacked the necessary resources (other than
                        memory) to initialize the lock.

     [ENOMEM]           Insufficient memory exists to initialize the lock.

     [EPERM]            The caller does not have sufficient privilege to per-
                        form the operation.

     The pthread_rwlock_init() function may fail if:

     [EBUSY]            The system has detected an attempt to re-initialize
                        the object referenced by lock, a previously initial-
                        ized but not yet destroyed read/write lock.

     [EINVAL]           The value specified by attr is invalid.


SEE ALSO

     pthread_rwlock_destroy(3), pthread_rwlockattr_init(3),
     pthread_rwlockattr_setpshared(3)


STANDARDS

     The pthread_rwlock_init() function is expected to conform to Version 2 of
     the Single UNIX Specification (``SUSv2'').


HISTORY

     The pthread_rwlock_init() function first appeared in FreeBSD 3.0.


BUGS

     The PTHREAD_PROCESS_SHARED attribute is not supported.

BSD                             August 4, 1998                             BSD

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