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Man Pages


Manual Reference Pages  -  PTHREAD_RWLOCK_INIT (3)

NAME

pthread_rwlock_init - initialize a read/write lock

CONTENTS

Library
Synopsis
Description
Return Values
Errors
See Also
Standards
History
Bugs

LIBRARY


.Lb libpthread

SYNOPSIS


.In 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. Otherwise 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 object referenced by lock, a previously initialized but not yet destroyed read/write lock.
[EINVAL]
  The value specified by attr is invalid.

SEE ALSO

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

STANDARDS

The pthread_rwlock_init function is expected to conform to -susv2.

HISTORY

The pthread_rwlock_init function first appeared in
.Fx 3.0 .

BUGS

The PTHREAD_PROCESS_SHARED attribute is not supported.
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