MirOS Manual: pthread_rwlock_init(3)

PTHREAD_RWLOCK_INIT(3)     BSD Programmer's 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 perform
                   the operation.

     The pthread_rwlock_init() function may fail if:

     [EBUSY]       The system has detected an attempt to re-initialize the ob-
                   ject referenced by lock, a previously initialized 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.

HISTORY

     The pthread_rwlock_init() function first appeared in FreeBSD 3.0 and
     OpenBSD 2.5.

BUGS

     The PTHREAD_PROCESS_SHARED attribute is not supported.

MirOS BSD #10-current           August 4, 1998                               1

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