Originální popis anglicky:
pthread_condattr_destroy, pthread_condattr_init - destroy and initialize the
condition variable attributes object
Návod, kniha: POSIX Programmer's Manual
#include <pthread.h>
int pthread_condattr_destroy(pthread_condattr_t *
attr);
int pthread_condattr_init(pthread_condattr_t *
attr);
The
pthread_condattr_destroy() function shall destroy a condition
variable attributes object; the object becomes, in effect, uninitialized. An
implementation may cause
pthread_condattr_destroy() to set the object
referenced by
attr to an invalid value. A destroyed
attr
attributes object can be reinitialized using
pthread_condattr_init();
the results of otherwise referencing the object after it has been destroyed
are undefined.
The
pthread_condattr_init() function shall initialize a condition
variable attributes object
attr with the default value for all of the
attributes defined by the implementation.
Results are undefined if
pthread_condattr_init() is called specifying an
already initialized
attr attributes object.
After a condition variable attributes object has been used to initialize one or
more condition variables, any function affecting the attributes object
(including destruction) shall not affect any previously initialized condition
variables.
This volume of IEEE Std 1003.1-2001 requires two attributes, the
clock attribute and the
process-shared attribute.
Additional attributes, their default values, and the names of the associated
functions to get and set those attribute values are implementation-defined.
If successful, the
pthread_condattr_destroy() and
pthread_condattr_init() functions shall return zero; otherwise, an
error number shall be returned to indicate the error.
The
pthread_condattr_destroy() function may fail if:
- EINVAL
- The value specified by attr is invalid.
The
pthread_condattr_init() function shall fail if:
- ENOMEM
- Insufficient memory exists to initialize the condition
variable attributes object.
These functions shall not return an error code of [EINTR].
The following sections are informative.
None.
None.
See
pthread_attr_init() and
pthread_mutex_init() .
A
process-shared attribute has been defined for condition variables for
the same reason it has been defined for mutexes.
None.
pthread_attr_destroy() ,
pthread_cond_destroy() ,
pthread_condattr_getpshared() ,
pthread_create() ,
pthread_mutex_destroy() , the Base Definitions volume of
IEEE Std 1003.1-2001,
<pthread.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html
.
