pthread_rwlockattr_setkind_Library Functions Mpthread_rwlockattr_setkind_np(3) NAME pthread_rwlockattr_setkind_np, pthread_rwlockattr_getkind_np - set/get the read-write lock kind of the thread read-write lock attribute object LIBRARY POSIX threads library (libpthread, -lpthread) SYNOPSIS #include <pthread.h> int pthread_rwlockattr_setkind_np(pthread_rwlockattr_t *attr, int pref); int pthread_rwlockattr_getkind_np( const pthread_rwlockattr_t *restrict attr, int *restrict pref); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): pthread_rwlockattr_setkind_np(), pthread_rwlockattr_getkind_np(): _XOPEN_SOURCE >= 500 || _POSIX_C_SOURCE >= 200809L DESCRIPTION The pthread_rwlockattr_setkind_np() function sets the "lock kind" at- tribute of the read-write lock attribute object referred to by attr to the value specified in pref. The argument pref may be set to one of the following: PTHREAD_RWLOCK_PREFER_READER_NP This is the default. A thread may hold multiple read locks; that is, read locks are recursive. According to The Single Unix Specification, the behavior is unspecified when a reader tries to place a lock, and there is no write lock but writers are waiting. Giving preference to the reader, as is set by PTHREAD_RWLOCK_PREFER_READER_NP, implies that the reader will receive the requested lock, even if a writer is waiting. As long as there are readers, the writer will be starved. PTHREAD_RWLOCK_PREFER_WRITER_NP This is intended as the write lock analog of PTHREAD_RWLOCK_PRE- FER_READER_NP. This is ignored by glibc because the POSIX re- quirement to support recursive read locks would cause this op- tion to create trivial deadlocks; instead use PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP which ensures the application developer will not take recursive read locks thus avoiding deadlocks. PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP Setting the lock kind to this avoids writer starvation as long as any read locking is not done in a recursive fashion. The pthread_rwlockattr_getkind_np() function returns the value of the lock kind attribute of the read-write lock attribute object referred to by attr in the pointer pref. RETURN VALUE On success, these functions return 0. Given valid pointer arguments, pthread_rwlockattr_getkind_np() always succeeds. On error, pthread_rwlockattr_setkind_np() returns a nonzero error number. ERRORS EINVAL pref specifies an unsupported value. VERSIONS The pthread_rwlockattr_getkind_np() and pthread_rwlockattr_setkind_np() functions first appeared in glibc 2.1. STANDARDS These functions are non-standard GNU extensions; hence the suffix "_np" (nonportable) in the names. SEE ALSO pthreads(7) Linux man-pages 6.03 2022-10-30 pthread_rwlockattr_setkind_np(3)
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