установить / получить атрибут маски сигнала в объекте атрибутов потока (set/get signal mask attribute in thread attributes object)
Имя (Name)
pthread_attr_setsigmask_np, pthread_attr_getsigmask_np - set/get
signal mask attribute in thread attributes object
Синопсис (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.
Описание (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.
Возвращаемое значение (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.
Ошибки (Error)
ENOMEM (pthread_attr_setsigmask_np()) Could not allocate memory.
Версии (Versions)
These functions are provided by glibc since version 2.32.
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│pthread_attr_setsigmask_np(), │ Thread safety │ MT-Safe │
│pthread_attr_getsigmask_np() │ │ │
└──────────────────────────────────────┴───────────────┴─────────┘
Стандарты (Conforming to)
These functions are nonstandard GNU extensions; hence the suffix
"_np" (nonportable) in the names.
Примечание (Note)
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.
Смотри также (See also)
sigprocmask(2), pthread_attr_init(3), pthread_sigmask(3),
pthreads(7), signal(7)
