thr_mutex.c (6439d4c2866f4d9822ddb43789af19976ebce620) thr_mutex.c (7d9d7ca2ed3e3d630e63482c41f2d26194129c2c)
1/*
2 * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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59#define _MUTEX_ASSERT_NOT_OWNED(m)
60#endif
61
62/*
63 * Prototypes
64 */
65static int get_muncontested(pthread_mutex_t, int);
66static void get_mcontested(pthread_mutex_t);
1/*
2 * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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59#define _MUTEX_ASSERT_NOT_OWNED(m)
60#endif
61
62/*
63 * Prototypes
64 */
65static int get_muncontested(pthread_mutex_t, int);
66static void get_mcontested(pthread_mutex_t);
67static int mutex_lock_common(pthread_mutex_t *, int);
67static inline int mutex_self_trylock(pthread_mutex_t);
68static inline int mutex_self_lock(pthread_mutex_t);
69static inline int mutex_unlock_common(pthread_mutex_t *, int);
70static void mutex_priority_adjust(pthread_mutex_t);
71static void mutex_rescan_owned (pthread_t, pthread_mutex_t);
72static inline pthread_t mutex_queue_deq(pthread_mutex_t);
73static inline void mutex_queue_remove(pthread_mutex_t, pthread_t);
74static inline void mutex_queue_enq(pthread_mutex_t, pthread_t);

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1376
1377/*
1378 * Returns with the lock owned and on the threads mutexq if
1379 * it is currently unowned. Returns 1, otherwise.
1380 */
1381static int
1382get_muncontested(pthread_mutex_t mutexp, int nonblock)
1383{
68static inline int mutex_self_trylock(pthread_mutex_t);
69static inline int mutex_self_lock(pthread_mutex_t);
70static inline int mutex_unlock_common(pthread_mutex_t *, int);
71static void mutex_priority_adjust(pthread_mutex_t);
72static void mutex_rescan_owned (pthread_t, pthread_mutex_t);
73static inline pthread_t mutex_queue_deq(pthread_mutex_t);
74static inline void mutex_queue_remove(pthread_mutex_t, pthread_t);
75static inline void mutex_queue_enq(pthread_mutex_t, pthread_t);

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1377
1378/*
1379 * Returns with the lock owned and on the threads mutexq if
1380 * it is currently unowned. Returns 1, otherwise.
1381 */
1382static int
1383get_muncontested(pthread_mutex_t mutexp, int nonblock)
1384{
1384 if (mutexp->m_owner != NULL && mutexp->m_owner != curthread)
1385 if (mutexp->m_owner != NULL && mutexp->m_owner != curthread) {
1385 return (-1);
1386 return (-1);
1386 else if (mutexp->m_owner == curthread)
1387 } else if (mutexp->m_owner == curthread) {
1387 if (nonblock)
1388 return (mutex_self_trylock(mutexp));
1389 else
1390 return (mutex_self_lock(mutexp));
1388 if (nonblock)
1389 return (mutex_self_trylock(mutexp));
1390 else
1391 return (mutex_self_lock(mutexp));
1392 }
1391
1392 /*
1393 * The mutex belongs to this thread now. Mark it as
1394 * such. Add it to the list of mutexes owned by this
1395 * thread.
1396 */
1397 mutexp->m_owner = curthread;
1398 _MUTEX_ASSERT_NOT_OWNED(mutexp);

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1394 /*
1395 * The mutex belongs to this thread now. Mark it as
1396 * such. Add it to the list of mutexes owned by this
1397 * thread.
1398 */
1399 mutexp->m_owner = curthread;
1400 _MUTEX_ASSERT_NOT_OWNED(mutexp);

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