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PTHREAD_RWLOCKATTR_SETPSHARED(3) FreeBSD Library Functions Manual PTHREAD_RWLOCKATTR_SETPSHARED(3)

pthread_rwlockattr_setpshared —
set the process shared attribute

POSIX Threads Library (libpthread, -lpthread)

#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. The pshared argument may be one of two values:
Any thread of any process that has access to the memory where the read/write lock resides can manipulate the lock.
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.

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

pthread_rwlock_init(3), pthread_rwlockattr_getpshared(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. Support for process-shared read/write locks appeared in FreeBSD 11.0.
May 31, 2016 FreeBSD 13.1-RELEASE
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