PTHREAD_ATTR_SETSIGMASK_NP
Section: Linux Programmer's Manual (3)
Updated: 2021-03-22
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NAME
pthread_attr_setsigmask_np, pthread_attr_getsigmask_np - set/get
signal mask attribute in thread attributes object
SYNOPSIS
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <pthread.h>
int pthread_attr_setsigmask_np(pthread_attr_t *attr,
const sigset_t *sigmask);
int pthread_attr_getsigmask_np(const pthread_attr_t *attr,
sigset_t *sigmask);
Compile and link with -pthread.
DESCRIPTION
The
pthread_attr_setsigmask_np()
function sets the signal mask attribute of the
thread attributes object referred to by
attr
to the value specified in
*sigmask.
If
sigmask
is specified as NULL, then any existing signal mask attribute in
attr
is unset.
The
pthread_attr_getsigmask_np()
function returns the signal mask attribute of the thread attributes object
referred to by
attr
in the buffer pointed to by
sigmask.
If the signal mask attribute is currently unset,
then this function returns the special value
PTHREAD_ATTR_NO_SIGMASK_NP
as its result.
RETURN VALUE
The
pthread_attr_setsigmask_np()
function returns 0 on success, or a nonzero error number on failure.
the
pthread_attr_getsigmask_np()
function returns either 0 or
PTHREAD_ATTR_NO_SIGMASK_NP.
When 0 is returned, the signal mask attribute is returned via
sigmask.
A return value of
PTHREAD_ATTR_NO_SIGMASK_NP
indicates that the signal mask attribute is not set in
attr.
On error, these functions return a positive error number.
ERRORS
- ENOMEM
-
(pthread_attr_setsigmask_np())
Could not allocate memory.
VERSIONS
These functions are provided by glibc since version 2.32.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
Interface | Attribute | Value
|
pthread_attr_setsigmask_np(),
pthread_attr_getsigmask_np()
| Thread safety | MT-Safe
|
CONFORMING TO
These functions are nonstandard GNU extensions;
hence the suffix "_np" (nonportable) in the names.
NOTES
The signal mask attribute determines the signal mask that will be assigned to
a thread created using the thread attributes object
attr.
If this attribute is not set, then a thread created using
attr
will inherit a copy of the creating thread's signal mask.
For more details on signal masks, see
sigprocmask(2).
For a description of a set of macros
that can be used to manipulate and inspect signal sets, see
sigsetops(3).
In the absence of
pthread_attr_setsigmask_np()
it is possible to create a thread with a desired signal mask as follows:
- •
-
The creating thread uses
pthread_sigmask(3)
to save its current signal mask and set its mask to block all signals.
- •
-
The new thread is then created using
pthread_create();
the new thread will inherit the creating thread's signal mask.
- •
-
The new thread sets its signal mask to the desired value using
pthread_sigmask(3).
- •
-
The creating thread restores its signal mask to the original value.
Following the above steps,
there is no possibility for the new thread to receive a signal
before it has adjusted its signal mask to the desired value.
SEE ALSO
sigprocmask(2),
pthread_attr_init(3),
pthread_sigmask(3),
pthreads(7),
signal(7)
COLOPHON
This page is part of release 5.11 of the Linux
man-pages
project.
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
https://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- VERSIONS
-
- ATTRIBUTES
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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Time: 06:22:45 GMT, May 09, 2021