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PTHREAD_RWLOCKATTR_SETPSHARED(3) Library Functions Manual PTHREAD_RWLOCKATTR_SETPSHARED(3)

pthread_rwlockattr_setpshared
set the process shared attribute

#include <pthread.h>
int
pthread_rwlockattr_setpshared(pthread_rwlockattr_t *attr, int pshared);

The pthread_rwlockattr_setpshared() function sets the process shared attribute of attr to the value referenced by pshared. pshared 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.

If successful, the pthread_rwlockattr_setpshared() function will return zero. Otherwise an error number will be returned to indicate the error.

pthread_rwlockattr_setpshared() will fail if:
 
 
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The value specified by attr or pshared is invalid.

pthread_rwlock_init(3), pthread_rwlockattr_init(3)

The pthread_rwlockattr_setpshared() function is expected to conform to Version 2 of the Single UNIX Specification (“SUSv2”).

The pthread_rwlockattr_setpshared() function first appeared in FreeBSD 3.0 and OpenBSD 2.5.

The PTHREAD_PROCESS_SHARED attribute is not supported.
June 5, 2013 OpenBSD-current