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pthread_rwlockattr_getpshared(3c)
pthread_...etpshared(3C) Standard C Library Functions pthread_...etpshared(3C)
NAME
pthread_rwlockattr_getpshared, pthread_rwlockattr_setpshared - get or
set process-shared attribute of read-write lock attributes object
SYNOPSIS
#include <pthread.h>
int pthread_rwlockattr_getpshared(
const pthread_rwlockattr_t *restrict attr,
int *restrict pshared);
int pthread_rwlockattr_setpshared(pthread_rwlockattr_t *attr,
int pshared);
DESCRIPTION
The process-shared attribute is set to PTHREAD_PROCESS_SHARED to permit
a read-write lock to be operated upon by any thread that has access to
the memory where the read-write lock is allocated, even if the read-
write lock is allocated in memory that is shared by multiple processes.
If the process-shared attribute is PTHREAD_PROCESS_PRIVATE, the read-
write lock will only be operated upon by threads created within the
same process as the thread that initialised the read-write lock. If
threads of differing processes attempt to operate on such a read-write
lock, the behaviour is undefined. The default value of the process-
shared attribute is PTHREAD_PROCESS_PRIVATE.
The pthread_rwlockattr_getpshared() function obtains the value of the
process-shared attribute from the initialised attributes object refer‐
enced by attr. The pthread_rwlockattr_setpshared() function is used to
set the process-shared attribute in an initialised attributes object
referenced by attr.
RETURN VALUES
If successful, the pthread_rwlockattr_setpshared() function returns 0.
Otherwise, an error number is returned to indicate the error.
Upon successful completion, the pthread_rwlockattr_getpshared() returns
0 and stores the value of the process-shared attribute of attr into the
object referenced by the pshared parameter. Otherwise an error number
is returned to indicate the error.
ERRORS
The pthread_rwlockattr_getpshared() and pthread_rwlockattr_setpshared()
functions will fail if:
EINVAL The value specified by attr or pshared 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
pthread_rwlock_init(3C), pthread_rwlock_rdlock(3C), pthread_rwlock_un‐
lock(3C), pthread_rwlock_wrlock(3C), , attributes(7), standards(7)
NOTES
Previous releases of Oracle Solaris provided the PTHREAD_RWSCALE_PRI‐
VATE_NP value of the process-shared attribute. This value is now depre‐
cated but is still supported for source and binary compatibility. When
passed to the pthread_rwlock_init() function, it is transformed into
(PTHREAD_PROCESS_PRIVATE | PTHREAD_RWLOCK_SCALABLE_NP).
Oracle Solaris 11.4 07 Oct 2016 pthread_...etpshared(3C)