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pthread_attr_setsigmask_np(3) — Linux manual page

pthread_a...igmask_np(3) Library Functions Manualpthread_a...igmask_np(3)

NAME top

 pthread_attr_setsigmask_np, pthread_attr_getsigmask_np - set/get
 signal mask attribute in thread attributes object

LIBRARY top

 POSIX threads library (libpthread, -lpthread)

SYNOPSIS top

 #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);

DESCRIPTION top

 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 top

 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 top

 ENOMEM (pthread_attr_setsigmask_np()) Could not allocate memory.

ATTRIBUTES top

 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() │ │ │
 └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS top

 GNU; hence the suffix "_np" (nonportable) in the names.

HISTORY top

 glibc 2.32.

NOTES top

 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 top

 sigprocmask(2), pthread_attr_init(3), pthread_sigmask(3),
 pthreads(7), signal(7)

COLOPHON top

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Linux man-pages 6.10 2024年07月23日 pthread_a...igmask_np(3)

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Pages that refer to this page: pthread_attr_init(3), pthread_sigmask(3)

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