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pthread_mutexattr_getrobust(3c)
pthread_...getrobust(3C) Standard C Library Functions pthread_...getrobust(3C)
NAME
pthread_mutexattr_getrobust, pthread_mutexattr_setrobust - get and set
the mutex robust attribute
SYNOPSIS
#include <pthread.h>
int pthread_mutexattr_getrobust(const pthread_mutexattr_t *attr,
int *robust);
int pthread_mutexattr_setrobust(pthread_mutexattr_t *attr,
int robust);
DESCRIPTION
The pthread_mutexattr_getrobust() and pthread_mutexattr_setrobust()
functions, respectively, get and set the mutex robust attribute. This
attribute is set in the robust parameter. Valid values for robust in‐
clude:
PTHREAD_MUTEX_STALLED
No special actions are taken if the owner of the mutex is termi‐
nated while holding the mutex lock. This can lead to deadlocks be‐
cause no other thread can unlock the mutex. This is the default
value.
PTHREAD_MUTEX_ROBUST
If the owning thread of a robust mutex terminates while holding the
mutex lock, or if the process containing the owning thread of a ro‐
bust mutex terminates, either normally or abnormally, or if the
process containing the owner of the mutex unmaps the memory con‐
taining the mutex or performs one of the exec(2) functions, the
next thread that acquires the mutex will be notified by the return
value EOWNERDEAD from the locking function.
The notified thread can then attempt to recover the state protected
by the mutex and, if successful, mark the state as consistent again
by a call to pthread_mutex_consistent(). After a subsequent suc‐
cessful call to pthread_mutex_unlock(3C), the mutex lock will be
released and can be used normally by other threads. If the mutex is
unlocked without a call to pthread_mutex_consistent(), it will be
in a permanently unusable state and all attempts to lock the mutex
will fail with the error ENOTRECOVERABLE. The only permissible op‐
eration on such a mutex is pthread_mutex_destroy(3C).
The actions required to make the state protected by the mutex con‐
sistent are solely dependent on the application. Calling
pthread_mutex_consistent(3C) does not, by itself, make the state
protected by the mutex consistent.
The behavior is undefined if the value specified by the attr argu‐
ment to pthread_mutexattr_getrobust() or pthread_mutexattr_setro‐
bust() does not refer to an initialized mutex attributes object.
RETURN VALUES
Upon successful completion, the pthread_mutexattr_getrobust() function
returns 0 and stores the value of the robust attribute of attr into the
object referenced by the robust parameter. Otherwise, an error value is
returned to indicate the error.
Upon successful completion, the pthread_mutexattr_setrobust() function
returns 0. Otherwise, an error value is returned to indicate the error.
ERRORS
The pthread_mutexattr_setrobust() function will fail if:
EINVAL The value of robust is invalid.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelMT-Safe _ Stan‐
dardSee standards(7).
SEE ALSO
exec(2), pthread_mutex_consistent(3C), pthread_mutex_destroy(3C),
pthread_mutex_init(3C), pthread_mutex_lock(3C), pthread_mutex_un‐
lock(3C), pthread_mutexattr_getpshared(3C), pthread_mutexattr_init(3C),
attributes(7), mutex(7), standards(7)
NOTES
The mutex memory must be zeroed before first initialization of a mutex
with the PTHREAD_MUTEX_ROBUST attribute. Any thread in any process in‐
terested in the robust lock can call pthread_mutex_init() to poten‐
tially initialize it, provided that all such callers of pthread_mu‐
tex_init() specify the same set of attributes in their attribute struc‐
tures. In this situation, if pthread_mutex_init() is called on a previ‐
ously initialized robust mutex, it will not reinitialize the mutex and
will return the error value EBUSY. If pthread_mutex_init() is called on
a previously initialized robust mutex, and if the caller specifies a
different set of attributes from those already in effect for the mutex,
it will not reinitialize the mutex and will return the error value EIN‐
VAL.
Oracle Solaris 11.4 16 May 2014 pthread_...getrobust(3C)