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pthreads: Adding rwlock implementation

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Adding an implementation for read/write locks into the pthread library.
These locks are writer priority, such that if any writers come in they
are given priority for writing.
This commit is contained in:
Mark Schulte
2017-04-07 07:03:00 -06:00
committed by Gregory Nutt
parent 58d0c1f228
commit 7bb26d2615
6 changed files with 454 additions and 2 deletions
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include/pthread.h
+41 -2
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@@ -337,6 +337,28 @@ typedef struct pthread_barrier_s pthread_barrier_t;
typedef bool pthread_once_t;
#define __PTHREAD_ONCE_T_DEFINED 1
#ifdef CONFIG_PTHREAD_RWLOCK
struct pthread_rwlock_s
{
pthread_mutex_t lock;
pthread_cond_t cv;
unsigned int num_readers;
unsigned int num_writers;
};
typedef struct pthread_rwlock_s pthread_rwlock_t;
typedef int pthread_rwlockattr_t;
#define PTHREAD_RWLOCK_INITIALIZER {PTHREAD_MUTEX_INITIALIZER, \
PTHREAD_COND_INITIALIZER, \
0, 0}
#define PTHREAD_MUTEX_INITIALIZER {NULL, SEM_INITIALIZER(1), -1, \
__PTHREAD_MUTEX_DEFAULT_FLAGS, \
PTHREAD_MUTEX_DEFAULT, 0}
#endif
#ifdef CONFIG_PTHREAD_CLEANUP
/* This type describes the pthread cleanup callback (non-standard) */
@@ -539,8 +561,8 @@ int pthread_barrierattr_setpshared(FAR pthread_barrierattr_t *attr,
int pthread_barrier_destroy(FAR pthread_barrier_t *barrier);
int pthread_barrier_init(FAR pthread_barrier_t *barrier,
FAR const pthread_barrierattr_t *attr,
unsigned int count);
FAR const pthread_barrierattr_t *attr,
unsigned int count);
int pthread_barrier_wait(FAR pthread_barrier_t *barrier);
/* Pthread initialization */
@@ -548,6 +570,23 @@ int pthread_barrier_wait(FAR pthread_barrier_t *barrier);
int pthread_once(FAR pthread_once_t *once_control,
CODE void (*init_routine)(void));
/* Pthread rwlock */
#ifdef CONFIG_PTHREAD_RWLOCK
int pthread_rwlock_destroy(FAR pthread_rwlock_t *rw_lock);
int pthread_rwlock_init(FAR pthread_rwlock_t *rw_lock,
FAR const pthread_rwlockattr_t *attr);
int pthread_rwlock_rdlock(pthread_rwlock_t *lock);
int pthread_rwlock_timedrdlock(FAR pthread_rwlock_t *lock,
FAR const struct timespec *abstime);
int pthread_rwlock_tryrdlock(FAR pthread_rwlock_t *lock);
int pthread_rwlock_wrlock(FAR pthread_rwlock_t *lock);
int pthread_rwlock_timedwrlock(FAR pthread_rwlock_t *lock,
FAR const struct timespec *abstime);
int pthread_rwlock_trywrlock(FAR pthread_rwlock_t *lock);
int pthread_rwlock_unlock(FAR pthread_rwlock_t *lock);
#endif /* CONFIG_PTHREAD_RWLOCK */
/* Pthread signal management APIs */
int pthread_kill(pthread_t thread, int sig);