PTHREAD_RWLOCKATTR_SE... BSD Library Functions Manual PTHREAD_RWLOCKATTR_SE...
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. The pshared argu- ment 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.
The pthread_rwlockattr_setpshared() function will fail if: [EINVAL] The value specified by attr or pshared is invalid.
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.
The PTHREAD_PROCESS_SHARED attribute is not supported. BSD August 4, 1998 BSD
Mac OS X 10.12.3 - Generated Sun Feb 5 16:30:10 CST 2017