By Irène Lassus
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7: If the C language makes no guarantees in presence of a data race, then why does the Linux kernel have so many data races? Are you trying to tell me that the Linux kernel is completely broken??? 3 POSIX Locking The POSIX standard allows the programmer to avoid data races via “POSIX locking”. POSIX locking features a number of primitives, the most fundamental of which are pthread_mutex_lock() and pthread_mutex_unlock(). These primitives operate on locks, which are of type pthread_mutex_t. These locks may be declared statically and initialized with PTHREAD_MUTEX_INITIALIZER, or they may be allocated dynamically and initialized using the pthread_mutex_init() primitive.
C) shows one way of measuring reader-writer lock scalability. Line 1 shows the definition and initialization of the readerwriter lock, line 2 shows the holdtime argument controlling the time each thread holds the readerwriter lock, line 3 shows the thinktime argument controlling the time between the release of the reader-writer lock and the next acquisition, line 4 defines the readcounts array into which each reader thread places the number of times it acquired the lock, and line 5 defines the nreadersrunning variable, which determines when all reader threads have started running.
As with pthread_mutex_t, pthread_rwlock_t may be statically initialized via PTHREAD_RWLOCK_INITIALIZER or dynamically initialized via the pthread_rwlock_ init() primitive. The pthread_rwlock_rdlock() primitive read-acquires the specified pthread_ rwlock_t, the pthread_rwlock_wrlock() primitive write-acquires it, and the pthread_rwlock_ unlock() primitive releases it. Only a single thread may write-hold a given pthread_rwlock_t at any given time, but multiple threads may read-hold a given pthread_rwlock_t, at least while there is no thread currently write-holding it.