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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 14.1-RELEASE-p8 May 31, 2016 FreeBSD 14.1-RELEASE-p8