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PTHREAD_RWLOCKATTR_SETPSHARED(3) FreeBSD Library Functions Manual
NAME
pthread_rwlockattr_setpshared - set the process shared attribute
LIBRARY
POSIX Threads Library (libpthread, -lpthread)
SYNOPSIS
#include <pthread.h>
int
pthread_rwlockattr_setpshared(pthread_rwlockattr_t *attr, int pshared);
DESCRIPTION
The pthread_rwlockattr_setpshared() function sets the process shared
attribute of attr to the value referenced by pshared. The pshared
argument may be one of two values:
PTHREAD_PROCESS_SHARED Any thread of any process that has access to the
memory where the read/write lock resides can
manipulate the lock.
PTHREAD_PROCESS_PRIVATE Only threads created within the same process as
the thread that initialized the read/write lock
can manipulate the lock. This is the default
value.
RETURN VALUES
If successful, the pthread_rwlockattr_setpshared() function will return
zero. Otherwise an error number will be returned to indicate the error.
ERRORS
The pthread_rwlockattr_setpshared() function will fail if:
[EINVAL] The value specified by attr or pshared is invalid.
SEE ALSO
pthread_rwlock_init(3), pthread_rwlockattr_getpshared(3),
pthread_rwlockattr_init(3)
STANDARDS
The pthread_rwlockattr_setpshared() function is expected to conform to
Version 2 of the Single UNIX Specification ("SUSv2").
HISTORY
The pthread_rwlockattr_setpshared() function first appeared in
FreeBSD 3.0. Support for process-shared read/write locks appeared in
FreeBSD 11.0.
FreeBSD 14.0-RELEASE-p11 May 31, 2016 FreeBSD 14.0-RELEASE-p11