diff options
Diffstat (limited to 'src/include/mutex.h')
| -rw-r--r-- | src/include/mutex.h | 50 |
1 files changed, 10 insertions, 40 deletions
diff --git a/src/include/mutex.h b/src/include/mutex.h index 6b81b1a6265..910eb7af5b9 100644 --- a/src/include/mutex.h +++ b/src/include/mutex.h @@ -21,8 +21,8 @@ struct __wt_condvar { int waiters; /* Numbers of waiters, or -1 if signalled with no waiters. */ /* - * The following fields are only used for automatically adjusting - * condition variables. They could be in a separate structure. + * The following fields are used for automatically adjusting condition + * variable wait times. */ uint64_t min_wait; /* Minimum wait duration */ uint64_t max_wait; /* Maximum wait duration */ @@ -30,11 +30,14 @@ struct __wt_condvar { }; /* + * Read/write locks: + * + * WiredTiger uses read/write locks for shared/exclusive access to resources. * !!! * Don't modify this structure without understanding the read/write locking * functions. */ -typedef union { /* Read/write lock */ +union __wt_rwlock { /* Read/write lock */ uint64_t u; struct { uint32_t wr; /* Writers and readers */ @@ -45,19 +48,6 @@ typedef union { /* Read/write lock */ uint16_t next; /* Next available ticket number */ uint16_t writers_active;/* Count of active writers */ } s; -} wt_rwlock_t; - -/* - * Read/write locks: - * - * WiredTiger uses read/write locks for shared/exclusive access to resources. - */ -struct __wt_rwlock { - WT_CACHE_LINE_PAD_BEGIN - const char *name; /* Lock name for debugging */ - - wt_rwlock_t rwlock; /* Read/write lock */ - WT_CACHE_LINE_PAD_END }; /* @@ -72,31 +62,17 @@ struct __wt_rwlock { #define SPINLOCK_PTHREAD_MUTEX 2 #define SPINLOCK_PTHREAD_MUTEX_ADAPTIVE 3 -#if SPINLOCK_TYPE == SPINLOCK_GCC - struct __wt_spinlock { WT_CACHE_LINE_PAD_BEGIN +#if SPINLOCK_TYPE == SPINLOCK_GCC volatile int lock; - - /* - * We track acquisitions and time spent waiting for some locks. For - * performance reasons and to make it possible to write generic code - * that tracks statistics for different locks, we store the offset - * of the statistics fields to be updated during lock acquisition. - */ - int16_t stat_count_off; /* acquisitions offset */ - int16_t stat_app_usecs_off; /* waiting application threads offset */ - int16_t stat_int_usecs_off; /* waiting server threads offset */ - WT_CACHE_LINE_PAD_END -}; - #elif SPINLOCK_TYPE == SPINLOCK_PTHREAD_MUTEX ||\ SPINLOCK_TYPE == SPINLOCK_PTHREAD_MUTEX_ADAPTIVE ||\ SPINLOCK_TYPE == SPINLOCK_MSVC - -struct __wt_spinlock { - WT_CACHE_LINE_PAD_BEGIN wt_mutex_t lock; +#else +#error Unknown spinlock type +#endif const char *name; /* Mutex name */ @@ -113,9 +89,3 @@ struct __wt_spinlock { int8_t initialized; /* Lock initialized, for cleanup */ WT_CACHE_LINE_PAD_END }; - -#else - -#error Unknown spinlock type - -#endif |