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PTHREAD_RWLOCKATTR(3) FreeBSD Library Functions Manual PTHREAD_RWLOCKATTR(3) NAME pthread_rwlockattr_init, pthread_rwlockattr_destroy, pthread_rwlockattr_getpshared, pthread_rwlockattr_setpshared - initialize, destroy or query read/write lock attributes LIBRARY POSIX Threads Library (libpthread, -lpthread) SYNOPSIS #include <pthread.h> int pthread_rwlockattr_init(pthread_rwlockattr_t *attr); int pthread_rwlockattr_destroy(pthread_rwlockattr_t *attr); int pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *__restrict attr, int * __restrict pshared); int pthread_rwlockattr_setpshared(pthread_rwlockattr_t *attr, int pshared); DESCRIPTION The pthread_rwlockattr_init() function is used to initialize a read/write lock attributes object. The pthread_rwlockattr_destroy() function is used to destroy a read/write lock attribute object previously created with pthread_rwlockattr_init(). The pthread_rwlockattr_getpshared() function shall obtain the value of process-shared attribute from the initialized attributes object referenced by attr. The pthread_rwlockattr_setpshared() function shall set the process-shared attribute in an initialized attributes object referenced by attr. RETURN VALUES If successful, all these functions return zero. Otherwise an error number will be returned to indicate the error. ERRORS pthread_rwlockattr_init() shall fail if: [ENOMEM] Insufficient memory exists to initialize the read/write lock attributes object. pthread_rwlockattr_init() and pthread_rwlockattr_destroy() may fail if: [EINVAL] The value specified by attr is invalid. pthread_rwlockattr_getpshared() and pthread_rwlockattr_setpshared() may fail if: [EINVAL] The value specified by attr is invalid. SEE ALSO pthread_rwlock_init(3) STANDARDS Both functions conform to IEEE Std 1003.1-2001 ("POSIX.1"). BUGS The pthread_rwlockattr_getpshared() and pthread_rwlockattr_setpshared() functions are hidden by default since only thread shared attributes are supported. FreeBSD 14.1-RELEASE-p8 June 12, 2016 FreeBSD 14.1-RELEASE-p8