pthread_rwlockattr_getpshared(2)         pthread_rwlockattr_getpshared(2)

  pthread_rwlockattr_getpshared()

  NAME

    pthread_rwlockattr_getpshared(), pthread_rwlockattr_setpshared() - get or
    set the process-shared attribute in a read-write lock attributes object

  SYNOPSIS

    #include 

    int pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *attr,
         int *pshared);
    int pthread_rwlockattr_setpshared(pthread_rwlockattr_t *attr,
         int pshared);

  DESCRIPTION

    The pthread_rwlockattr_setpshared(2) function sets the process-shared
    attribute in the read-write lock attributes object referenced by the attr
    argument to the value specified in the pshared argument. When the process-
    shared attribute is set to PTHREAD_PROCESS_SHARED, the read-write lock can
    be acted upon by any thread that can access the memory where the read-
    write lock object is stored, even if the read-write lock object is
    allocated in memory shared by multiple processes. When the process-shared
    attribute is set to PTHREAD_PROCESS_PRIVATE (the default), the read-write
    lock can be acted upon only by threads that have been created in the same
    process as the thread that initialized the read-write lock object.

    The pthread_rwlockattr_getpshared(2) function retrieves the process-shared
    attribute in the read-write lock attributes object referenced by attr,
    storing the value in the location referenced by the pshared argument.

  IMPLEMENTATION ISSUES

    In this version of Interix, this function supports only the
    PTHREAD_PROCESS_PRIVATE process-shared attribute.

  RETURN VALUES

    On success, both functions return 0; otherwise, an error code is returned.

  ERRORS

    Both functions can fail for the following reasons:

    [EINVAL]
        The attr argument is invalid, or the pshared argument is out of range.

    This function does not return [EINTR].

  SEE ALSO

    pthread_rwlock_destroy(2)

    pthread_rwlockattr_destroy(2)

  USAGE NOTES

    All of these functions are thread safe.

    None of these functions are async-signal safe.