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-rw-r--r--erts/include/internal/ethr_mutex.h145
-rw-r--r--erts/include/internal/i386/atomic.h49
-rw-r--r--erts/include/internal/sparc32/atomic.h35
-rw-r--r--erts/lib_src/common/ethr_mutex.c631
4 files changed, 588 insertions, 272 deletions
diff --git a/erts/include/internal/ethr_mutex.h b/erts/include/internal/ethr_mutex.h
index 8d9d5e3d08..636fdc1e2f 100644
--- a/erts/include/internal/ethr_mutex.h
+++ b/erts/include/internal/ethr_mutex.h
@@ -33,6 +33,13 @@
# define ETHR_MTX_HARD_DEBUG
#endif
+#if 0
+# define ETHR_MTX_CHK_EXCL
+#if 1
+# define ETHR_MTX_CHK_NON_EXCL
+#endif
+#endif
+
#ifdef ETHR_MTX_HARD_DEBUG
# ifdef __GNUC__
# warning ETHR_MTX_HARD_DEBUG
@@ -49,6 +56,15 @@
#if defined(ETHR_USE_OWN_RWMTX_IMPL__) || defined(ETHR_USE_OWN_MTX_IMPL__)
+#ifdef ETHR_DEBUG
+# ifndef ETHR_MTX_CHK_EXCL
+# define ETHR_MTX_CHK_EXCL
+# endif
+# ifndef ETHR_MTX_CHK_NON_EXCL
+# define ETHR_MTX_CHK_NON_EXCL
+# endif
+#endif
+
#if 0
# define ETHR_MTX_Q_LOCK_SPINLOCK__
# define ETHR_MTX_QLOCK_TYPE__ ethr_spinlock_t
@@ -68,8 +84,8 @@
/* frequent read kind */
#define ETHR_RWMTX_R_FLG__ (((long) 1) << 28)
-#define ETHR_RWMTX_R_PEND_UNLCK_MASK__ (ETHR_RWMTX_R_FLG__ - 1)
-#define ETHR_RWMTX_R_MASK__ (ETHR_RWMTX_R_WAIT_FLG__ - 1)
+#define ETHR_RWMTX_R_ABRT_UNLCK_FLG__ (((long) 1) << 27)
+#define ETHR_RWMTX_R_PEND_UNLCK_MASK__ (ETHR_RWMTX_R_ABRT_UNLCK_FLG__ - 1)
/* normal kind */
#define ETHR_RWMTX_RS_MASK__ (ETHR_RWMTX_R_WAIT_FLG__ - 1)
@@ -91,6 +107,12 @@ struct ethr_mutex_base_ {
#ifdef ETHR_MTX_HARD_DEBUG_WSQ
int ws;
#endif
+#ifdef ETHR_MTX_CHK_EXCL
+ ethr_atomic_t exclusive;
+#endif
+#ifdef ETHR_MTX_CHK_NON_EXCL
+ ethr_atomic_t non_exclusive;
+#endif
#ifdef ETHR_MTX_HARD_DEBUG_LFS
ethr_atomic_t hdbg_lfs;
#endif
@@ -344,6 +366,116 @@ do { \
#define ETHR_MTX_HARD_DEBUG_FENCE_INIT(X)
#endif
+#ifdef ETHR_MTX_CHK_EXCL
+
+#if !defined(ETHR_DEBUG) && defined(__GNUC__)
+#warning "check exclusive is enabled"
+#endif
+
+# define ETHR_MTX_CHK_EXCL_INIT__(MTXB) \
+ ethr_atomic_init(&(MTXB)->exclusive, 0)
+
+# define ETHR_MTX_CHK_EXCL_IS_EXCL(MTXB) \
+do { \
+ ETHR_COMPILER_BARRIER; \
+ if (!ethr_atomic_read(&(MTXB)->exclusive)) \
+ ethr_assert_failed(__FILE__, __LINE__, __func__,\
+ "is exclusive"); \
+ ETHR_COMPILER_BARRIER; \
+} while (0)
+# define ETHR_MTX_CHK_EXCL_IS_NOT_EXCL(MTXB) \
+do { \
+ ETHR_COMPILER_BARRIER; \
+ if (ethr_atomic_read(&(MTXB)->exclusive)) \
+ ethr_assert_failed(__FILE__, __LINE__, __func__,\
+ "is not exclusive"); \
+ ETHR_COMPILER_BARRIER; \
+} while (0)
+# define ETHR_MTX_CHK_EXCL_SET_EXCL(MTXB) \
+do { \
+ ETHR_MTX_CHK_EXCL_IS_NOT_EXCL((MTXB)); \
+ ethr_atomic_set(&(MTXB)->exclusive, 1); \
+ ETHR_COMPILER_BARRIER; \
+} while (0)
+# define ETHR_MTX_CHK_EXCL_UNSET_EXCL(MTXB) \
+do { \
+ ETHR_MTX_CHK_EXCL_IS_EXCL((MTXB)); \
+ ethr_atomic_set(&(MTXB)->exclusive, 0); \
+ ETHR_COMPILER_BARRIER; \
+} while (0)
+
+#ifdef ETHR_MTX_CHK_NON_EXCL
+
+#if !defined(ETHR_DEBUG) && defined(__GNUC__)
+#warning "check non-exclusive is enabled"
+#endif
+
+# define ETHR_MTX_CHK_NON_EXCL_INIT__(MTXB) \
+ ethr_atomic_init(&(MTXB)->non_exclusive, 0)
+# define ETHR_MTX_CHK_EXCL_IS_NON_EXCL(MTXB) \
+do { \
+ ETHR_COMPILER_BARRIER; \
+ if (!ethr_atomic_read(&(MTXB)->non_exclusive)) \
+ ethr_assert_failed(__FILE__, __LINE__, __func__,\
+ "is non-exclusive"); \
+ ETHR_COMPILER_BARRIER; \
+} while (0)
+# define ETHR_MTX_CHK_EXCL_IS_NOT_NON_EXCL(MTXB) \
+do { \
+ ETHR_COMPILER_BARRIER; \
+ if (ethr_atomic_read(&(MTXB)->non_exclusive)) \
+ ethr_assert_failed(__FILE__, __LINE__, __func__,\
+ "is not non-exclusive"); \
+ ETHR_COMPILER_BARRIER; \
+} while (0)
+# define ETHR_MTX_CHK_EXCL_SET_NON_EXCL(MTXB) \
+do { \
+ ETHR_COMPILER_BARRIER; \
+ ethr_atomic_inc(&(MTXB)->non_exclusive); \
+ ETHR_COMPILER_BARRIER; \
+} while (0)
+# define ETHR_MTX_CHK_EXCL_SET_NON_EXCL_NO(MTXB, NO) \
+do { \
+ ETHR_COMPILER_BARRIER; \
+ ethr_atomic_add(&(MTXB)->non_exclusive, (NO)); \
+ ETHR_COMPILER_BARRIER; \
+} while (0)
+# define ETHR_MTX_CHK_EXCL_UNSET_NON_EXCL(MTXB) \
+do { \
+ ETHR_COMPILER_BARRIER; \
+ ethr_atomic_dec(&(MTXB)->non_exclusive); \
+ ETHR_COMPILER_BARRIER; \
+} while (0)
+#else
+# define ETHR_MTX_CHK_NON_EXCL_INIT__(MTXB)
+# define ETHR_MTX_CHK_EXCL_IS_NON_EXCL(MTXB)
+# define ETHR_MTX_CHK_EXCL_IS_NOT_NON_EXCL(MTXB)
+# define ETHR_MTX_CHK_EXCL_SET_NON_EXCL_NO(MTXB, NO)
+# define ETHR_MTX_CHK_EXCL_SET_NON_EXCL(MTXB)
+# define ETHR_MTX_CHK_EXCL_UNSET_NON_EXCL(MTXB)
+#endif
+
+#else
+# define ETHR_MTX_CHK_EXCL_INIT__(MTXB)
+# define ETHR_MTX_CHK_EXCL_IS_EXCL(MTXB)
+# define ETHR_MTX_CHK_EXCL_IS_NOT_EXCL(MTXB)
+# define ETHR_MTX_CHK_EXCL_SET_EXCL(MTXB)
+# define ETHR_MTX_CHK_EXCL_UNSET_EXCL(MTXB)
+# define ETHR_MTX_CHK_NON_EXCL_INIT__(MTXB)
+# define ETHR_MTX_CHK_EXCL_IS_NON_EXCL(MTXB)
+# define ETHR_MTX_CHK_EXCL_IS_NOT_NON_EXCL(MTXB)
+# define ETHR_MTX_CHK_EXCL_SET_NON_EXCL_NO(MTXB, NO)
+# define ETHR_MTX_CHK_EXCL_SET_NON_EXCL(MTXB)
+# define ETHR_MTX_CHK_EXCL_UNSET_NON_EXCL(MTXB)
+#endif
+
+# define ETHR_MTX_CHK_EXCL_INIT(MTXB) \
+do { \
+ ETHR_MTX_CHK_EXCL_INIT__((MTXB)); \
+ ETHR_MTX_CHK_NON_EXCL_INIT__((MTXB)); \
+} while (0)
+
+
#ifdef ETHR_USE_OWN_MTX_IMPL__
#define ETHR_MTX_DEFAULT_MAIN_SPINCOUNT_MAX 2000
@@ -369,6 +501,11 @@ ETHR_INLINE_FUNC_NAME_(ethr_mutex_trylock)(ethr_mutex *mtx)
act = ethr_atomic_cmpxchg_acqb(&mtx->mtxb.flgs, ETHR_RWMTX_W_FLG__, 0);
res = (act == 0) ? 0 : EBUSY;
+#ifdef ETHR_MTX_CHK_EXCL
+ if (res == 0)
+ ETHR_MTX_CHK_EXCL_SET_EXCL(&mtx->mtxb);
+#endif
+
ETHR_MTX_HARD_DEBUG_LFS_TRYRWLOCK(&mtx->mtxb, res);
ETHR_MTX_HARD_DEBUG_FENCE_CHK(mtx);
@@ -386,6 +523,8 @@ ETHR_INLINE_FUNC_NAME_(ethr_mutex_lock)(ethr_mutex *mtx)
if (act != 0)
ethr_mutex_lock_wait__(mtx, act);
+ ETHR_MTX_CHK_EXCL_SET_EXCL(&mtx->mtxb);
+
ETHR_MTX_HARD_DEBUG_LFS_RWLOCK(&mtx->mtxb);
ETHR_MTX_HARD_DEBUG_FENCE_CHK(mtx);
@@ -400,6 +539,8 @@ ETHR_INLINE_FUNC_NAME_(ethr_mutex_unlock)(ethr_mutex *mtx)
ETHR_MTX_HARD_DEBUG_FENCE_CHK(mtx);
ETHR_MTX_HARD_DEBUG_LFS_RWUNLOCK(&mtx->mtxb);
+ ETHR_MTX_CHK_EXCL_UNSET_EXCL(&mtx->mtxb);
+
act = ethr_atomic_cmpxchg_relb(&mtx->mtxb.flgs, 0, ETHR_RWMTX_W_FLG__);
if (act != ETHR_RWMTX_W_FLG__)
ethr_mutex_unlock_wake__(mtx, act);
diff --git a/erts/include/internal/i386/atomic.h b/erts/include/internal/i386/atomic.h
index f28258059f..52d01aab32 100644
--- a/erts/include/internal/i386/atomic.h
+++ b/erts/include/internal/i386/atomic.h
@@ -167,15 +167,52 @@ ethr_native_atomic_xchg(ethr_native_atomic_t *var, long val)
* Atomic ops with at least specified barriers.
*/
-#define ethr_native_atomic_read_acqb ethr_native_atomic_read
-#define ethr_native_atomic_inc_return_acqb ethr_native_atomic_inc_return
+static ETHR_INLINE long
+ethr_native_atomic_read_acqb(ethr_native_atomic_t *var)
+{
+ long val;
+#if defined(__x86_64__) || !defined(ETHR_PRE_PENTIUM4_COMPAT)
+ val = var->counter;
+#else
+ val = ethr_native_atomic_add_return(var, 0);
+#endif
+ __asm__ __volatile__("" : : : "memory");
+ return val;
+}
+
+static ETHR_INLINE void
+ethr_native_atomic_set_relb(ethr_native_atomic_t *var, long i)
+{
+ __asm__ __volatile__("" : : : "memory");
#if defined(__x86_64__) || !defined(ETHR_PRE_PENTIUM4_COMPAT)
-#define ethr_native_atomic_set_relb ethr_native_atomic_set
+ var->counter = i;
#else
-#define ethr_native_atomic_set_relb ethr_native_atomic_xchg
+ (void) ethr_native_atomic_xchg(var, i);
#endif
-#define ethr_native_atomic_dec_relb ethr_native_atomic_dec
-#define ethr_native_atomic_dec_return_relb ethr_native_atomic_dec_return
+}
+
+static ETHR_INLINE long
+ethr_native_atomic_inc_return_acqb(ethr_native_atomic_t *var)
+{
+ long res = ethr_native_atomic_inc_return(var);
+ __asm__ __volatile__("" : : : "memory");
+ return res;
+}
+
+static ETHR_INLINE void
+ethr_native_atomic_dec_relb(ethr_native_atomic_t *var)
+{
+ __asm__ __volatile__("" : : : "memory");
+ ethr_native_atomic_dec(var);
+}
+
+static ETHR_INLINE long
+ethr_native_atomic_dec_return_relb(ethr_native_atomic_t *var)
+{
+ __asm__ __volatile__("" : : : "memory");
+ return ethr_native_atomic_dec_return(var);
+}
+
#define ethr_native_atomic_cmpxchg_acqb ethr_native_atomic_cmpxchg
#define ethr_native_atomic_cmpxchg_relb ethr_native_atomic_cmpxchg
diff --git a/erts/include/internal/sparc32/atomic.h b/erts/include/internal/sparc32/atomic.h
index 2a995d4465..2da6472393 100644
--- a/erts/include/internal/sparc32/atomic.h
+++ b/erts/include/internal/sparc32/atomic.h
@@ -176,38 +176,59 @@ ethr_native_atomic_cmpxchg(ethr_native_atomic_t *var, long new, long old)
* Atomic ops with at least specified barriers.
*/
+/* TODO: relax acquire barriers */
+
static ETHR_INLINE long
ethr_native_atomic_read_acqb(ethr_native_atomic_t *var)
{
long res = ethr_native_atomic_read(var);
- __asm__ __volatile__("membar #StoreLoad|#StoreStore");
+ __asm__ __volatile__("membar #LoadLoad|#LoadStore|#StoreLoad|#StoreStore" : : : "memory");
return res;
}
static ETHR_INLINE void
ethr_native_atomic_set_relb(ethr_native_atomic_t *var, long i)
{
- __asm__ __volatile__("membar #LoadStore|#StoreStore");
+ __asm__ __volatile__("membar #LoadStore|#StoreStore" : : : "memory");
ethr_native_atomic_set(var, i);
}
+static ETHR_INLINE long
+ethr_native_atomic_inc_return_acqb(ethr_native_atomic_t *var)
+{
+ long res = ethr_native_atomic_inc_return(var);
+ __asm__ __volatile__("membar #LoadLoad|#LoadStore" : : : "memory");
+ return res;
+}
+
static ETHR_INLINE void
ethr_native_atomic_dec_relb(ethr_native_atomic_t *var)
{
- __asm__ __volatile__("membar #LoadStore|#StoreStore");
+ __asm__ __volatile__("membar #LoadStore|#StoreStore" : : : "memory");
ethr_native_atomic_dec(var);
}
static ETHR_INLINE long
ethr_native_atomic_dec_return_relb(ethr_native_atomic_t *var)
{
- __asm__ __volatile__("membar #LoadStore|#StoreStore");
+ __asm__ __volatile__("membar #LoadStore|#StoreStore" : : : "memory");
return ethr_native_atomic_dec_return(var);
}
-#define ethr_native_atomic_inc_return_acqb ethr_native_atomic_inc_return
-#define ethr_native_atomic_cmpxchg_acqb ethr_native_atomic_cmpxchg
-#define ethr_native_atomic_cmpxchg_relb ethr_native_atomic_cmpxchg
+static ETHR_INLINE long
+ethr_native_atomic_cmpxchg_acqb(ethr_native_atomic_t *var, long new, long old)
+{
+ long res = ethr_native_atomic_cmpxchg(var, new, old);
+ __asm__ __volatile__("membar #LoadLoad|#LoadStore" : : : "memory");
+ return res;
+}
+
+static ETHR_INLINE long
+ethr_native_atomic_cmpxchg_relb(ethr_native_atomic_t *var, long new, long old)
+{
+ __asm__ __volatile__("membar #LoadStore|#StoreStore" : : : "memory");
+ return ethr_native_atomic_cmpxchg(var, new, old);
+}
#endif /* ETHR_TRY_INLINE_FUNCS */
diff --git a/erts/lib_src/common/ethr_mutex.c b/erts/lib_src/common/ethr_mutex.c
index 78323b62a3..c5738c3d77 100644
--- a/erts/lib_src/common/ethr_mutex.c
+++ b/erts/lib_src/common/ethr_mutex.c
@@ -205,9 +205,14 @@ static void hard_debug_chk_q__(struct ethr_mutex_base_ *, int);
#ifdef ETHR_USE_OWN_RWMTX_IMPL__
static void
+rwmutex_transfer_read_lock(ethr_rwmutex *rwmtx,
+ long initial,
+ int q_locked);
+static void
rwmutex_unlock_wake(ethr_rwmutex *rwmtx,
int have_w,
- long initial);
+ long initial,
+ int transfer_read_lock);
static int
rwmutex_try_complete_runlock(ethr_rwmutex *rwmtx,
long initial,
@@ -334,7 +339,7 @@ rwmutex_freqread_rdrs_read(ethr_rwmutex *rwmtx, int ix)
ETHR_ASSERT(res >= 0);
break;
case ETHR_RWMUTEX_TYPE_EXTREMELY_FREQUENT_READ:
- ETHR_ASSERT(res == 0 || res == 1);
+ ETHR_ASSERT(ix == 0 ? res >= 0 : (res == 0 || res == 1));
break;
default:
ETHR_ASSERT(0);
@@ -400,6 +405,7 @@ event_wait(struct ethr_mutex_base_ *mtxb,
int locked = 0;
long act;
int need_try_complete_runlock = 0;
+ int transfer_read_lock = 0;
/* Need to enqueue and wait... */
@@ -444,8 +450,8 @@ event_wait(struct ethr_mutex_base_ *mtxb,
while (1) {
long new, exp = act;
- int freqread_tryrlock = 0;
need_try_complete_runlock = 0;
+ transfer_read_lock = 0;
if (type == ETHR_RWMTX_W_WAIT_FLG__) {
if (is_freq_read && act == ETHR_RWMTX_R_FLG__)
@@ -465,14 +471,11 @@ event_wait(struct ethr_mutex_base_ *mtxb,
new = act + 1; /* Try to get it */
}
else {
- if (act & ~ETHR_RWMTX_R_FLG__)
- new = act | ETHR_RWMTX_R_WAIT_FLG__;
- else { /* Try to get it */
- ethr_rwmutex *rwmtx = (ethr_rwmutex *) mtxb;
- rwmutex_freqread_rdrs_inc(rwmtx, tse);
- ETHR_MEMORY_BARRIER;
- new = act | ETHR_RWMTX_R_FLG__;
- freqread_tryrlock = 1;
+ new = act | ETHR_RWMTX_R_WAIT_FLG__;
+ if ((act & (ETHR_RWMTX_W_FLG__
+ | ETHR_RWMTX_W_WAIT_FLG__)) == 0) {
+ /* Transfer read lock to this thread. */
+ transfer_read_lock = 1;
}
}
}
@@ -488,24 +491,6 @@ event_wait(struct ethr_mutex_base_ *mtxb,
goto done;
}
}
-
- if (freqread_tryrlock) {
- ethr_rwmutex *rwmtx = (ethr_rwmutex *) mtxb;
-
- /* We didn't set ETHR_RWMTX_R_FLG__, however someone
- else might have */
- if (act == ETHR_RWMTX_R_FLG__)
- goto done; /* Got it by help from someone else */
-
- ETHR_ASSERT((act & ETHR_RWMTX_WAIT_FLGS__) == 0);
- /*
- * We know that no waiter flags have been set, i.e.,
- * we cannot get into a situation where we need to wake
- * someone up here. Just restore the readers counter
- * and do it over again...
- */
- rwmutex_freqread_rdrs_dec(rwmtx, tse);
- }
}
/* Enqueue */
@@ -535,20 +520,36 @@ event_wait(struct ethr_mutex_base_ *mtxb,
/* Wait */
locked = 0;
- ETHR_MTX_Q_UNLOCK(&mtxb->qlck);
- if (need_try_complete_runlock) {
+ ETHR_ASSERT(!(transfer_read_lock && need_try_complete_runlock));
+
+ if (transfer_read_lock) {
ETHR_ASSERT(((ethr_rwmutex *) mtxb)->type
!= ETHR_RWMUTEX_TYPE_NORMAL);
/*
- * We were the only one in queue when we enqueued, and it
- * was seemingly read locked. We need to try to complete a
- * runlock otherwise we might be hanging forever. If the
- * runlock could be completed we will be dequeued and
- * woken by ourselves.
+ * We are the only one in the queue and we are not write
+ * locked; rwmutex_transfer_read_lock() will:
+ * - transfer a read lock to us (since we're first in q)
+ * - unlock the Q-lock
*/
- rwmutex_try_complete_runlock((ethr_rwmutex *) mtxb,
- act, tse, 0, 1, 0);
+ rwmutex_transfer_read_lock(((ethr_rwmutex *) mtxb), act, 1);
+ }
+ else {
+ ETHR_MTX_Q_UNLOCK(&mtxb->qlck);
+
+ if (need_try_complete_runlock) {
+ ETHR_ASSERT(((ethr_rwmutex *) mtxb)->type
+ != ETHR_RWMUTEX_TYPE_NORMAL);
+ /*
+ * We were the only one in queue when we enqueued, and it
+ * was seemingly read locked. We need to try to complete a
+ * runlock otherwise we might be hanging forever. If the
+ * runlock could be completed we will be dequeued and
+ * woken by ourselves.
+ */
+ rwmutex_try_complete_runlock((ethr_rwmutex *) mtxb,
+ act, tse, 0, 1, 0);
+ }
}
while (1) {
@@ -653,8 +654,6 @@ write_lock_wait(struct ethr_mutex_base_ *mtxb,
ethr_ts_event *tse = NULL;
int until_yield = ETHR_YIELD_AFTER_BUSY_LOOPS;
int res;
- int freq_read_size = -1;
- int freq_read_start_ix = -1;
ETHR_ASSERT(!is_freq_read || is_rwmtx);
@@ -666,44 +665,23 @@ write_lock_wait(struct ethr_mutex_base_ *mtxb,
*/
while (1) {
- long exp;
-
while (act != 0) {
if (is_freq_read && act == ETHR_RWMTX_R_FLG__) {
ethr_rwmutex *rwmtx = (ethr_rwmutex *) mtxb;
+ scnt--;
if (!tse)
tse = ethr_get_ts_event();
- if (freq_read_size < 0) {
- if (rwmtx->type == ETHR_RWMUTEX_TYPE_FREQUENT_READ) {
- freq_read_size = reader_groups_array_size;
- freq_read_start_ix = tse->rgix;
- }
- else {
- freq_read_size = main_threads_array_size;
- freq_read_start_ix = tse->mtix;
- }
- }
- res = check_readers_array(rwmtx,
- freq_read_start_ix,
- freq_read_size);
- scnt--;
- if (res == 0) {
- act = ethr_atomic_read(&mtxb->flgs);
- if (act & ETHR_RWMTX_R_MASK__) {
- res = rwmutex_try_complete_runlock(rwmtx, act,
- tse, 0, 0,
- 1);
- if (res != EBUSY)
- goto done; /* Got it */
- }
- if (scnt <= 0)
- goto chk_spin;
- if (--until_yield == 0) {
- until_yield = ETHR_YIELD_AFTER_BUSY_LOOPS;
- ETHR_YIELD();
- }
- continue;
+ res = rwmutex_try_complete_runlock(rwmtx, act,
+ tse, 0, 0,
+ 1);
+ if (res != EBUSY)
+ goto done; /* Got it */
+ if (scnt <= 0)
+ goto chk_spin;
+ if (--until_yield == 0) {
+ until_yield = ETHR_YIELD_AFTER_BUSY_LOOPS;
+ ETHR_YIELD();
}
}
@@ -728,11 +706,9 @@ write_lock_wait(struct ethr_mutex_base_ *mtxb,
scnt--;
}
- exp = act;
-
act = ethr_atomic_cmpxchg_acqb(&mtxb->flgs,
ETHR_RWMTX_W_FLG__,
- exp);
+ 0);
if (act == 0)
goto done; /* Got it */
}
@@ -753,6 +729,7 @@ mtxb_init(struct ethr_mutex_base_ *mtxb,
#ifdef ETHR_MTX_HARD_DEBUG_WSQ
mtxb->ws = 0;
#endif
+ ETHR_MTX_CHK_EXCL_INIT(mtxb);
if (no_spin) {
mtxb->main_scnt = 0;
mtxb->aux_scnt = 0;
@@ -1254,7 +1231,7 @@ ethr_cond_wait(ethr_cond *cnd, ethr_mutex *mtx)
ETHR_MTX_HARD_DEBUG_LFS_RWLOCK(&mtx->mtxb);
ETHR_MTX_HARD_DEBUG_FENCE_CHK(cnd);
ETHR_MTX_HARD_DEBUG_FENCE_CHK(mtx);
-
+ ETHR_MTX_CHK_EXCL_SET_EXCL(&mtx->mtxb);
tse->udata = udata;
ethr_leave_ts_event(tse);
return 0;
@@ -1499,7 +1476,62 @@ int check_readers_array(ethr_rwmutex *rwmtx,
return 0;
}
-static ETHR_INLINE void
+static void
+rwmutex_freqread_rdrs_dec_chk_wakeup(ethr_rwmutex *rwmtx,
+ ethr_ts_event *tse,
+ long initial)
+{
+ long act = initial;
+
+ if ((act & (ETHR_RWMTX_W_FLG__|
+ ETHR_RWMTX_R_ABRT_UNLCK_FLG__)) == 0) {
+ if ((act & ETHR_RWMTX_WAIT_FLGS__) == 0) {
+ if (act & ETHR_RWMTX_R_PEND_UNLCK_MASK__) {
+ /*
+ * We *need* to try to complete the runlock.
+ * A writer that just enqueued (not seen by us
+ * in flag field) may depend on someone else
+ * completing the runlock. We just took over
+ * that responsibilty since we modified reader
+ * groups.
+ */
+ rwmutex_try_complete_runlock(rwmtx, act, tse, 1, 0, 0);
+ }
+ }
+ else if ((act & ETHR_RWMTX_WAIT_FLGS__) == ETHR_RWMTX_R_WAIT_FLG__)
+ rwmutex_transfer_read_lock(rwmtx, act, 0);
+ else if ((act & ETHR_RWMTX_WAIT_FLGS__) == ETHR_RWMTX_W_WAIT_FLG__)
+ rwmutex_try_complete_runlock(rwmtx, act, tse, 1, 0, 0);
+ else {
+ /*
+ * Don't know if we got readers or writers
+ * first in queue; need to peek
+ */
+ ETHR_MTX_Q_LOCK(&rwmtx->mtxb.qlck);
+ if (!rwmtx->mtxb.q)
+ ETHR_MTX_Q_UNLOCK(&rwmtx->mtxb.qlck);
+ else if (is_w_waiter(rwmtx->mtxb.q)) {
+ act = ethr_atomic_read(&rwmtx->mtxb.flgs);
+ ETHR_MTX_Q_UNLOCK(&rwmtx->mtxb.qlck);
+ if ((act & ETHR_RWMTX_W_FLG__) == 0)
+ rwmutex_try_complete_runlock(rwmtx, act, tse, 1, 0, 0);
+ }
+ else {
+ /*
+ * rwmutex_transfer_read_lock() will
+ * unlock Q lock.
+ */
+ act = ethr_atomic_read(&rwmtx->mtxb.flgs);
+ if (act & ETHR_RWMTX_W_FLG__)
+ ETHR_MTX_Q_UNLOCK(&rwmtx->mtxb.qlck);
+ else
+ rwmutex_transfer_read_lock(rwmtx, act, 1);
+ }
+ }
+ }
+}
+
+static void
rwmutex_freqread_restore_failed_tryrlock(ethr_rwmutex *rwmtx,
ethr_ts_event *tse)
{
@@ -1509,24 +1541,11 @@ rwmutex_freqread_restore_failed_tryrlock(ethr_rwmutex *rwmtx,
*/
act = rwmutex_freqread_rdrs_dec_read(rwmtx, tse);
- ETHR_WRITE_MEMORY_BARRIER;
+ ETHR_MEMORY_BARRIER;
if (act == 0) {
-
-#ifndef ETHR_WRITE_MEMORY_BARRIER_IS_FULL
- ETHR_READ_MEMORY_BARRIER;
-#endif
-
act = ethr_atomic_read(&rwmtx->mtxb.flgs);
-
- if ((act & ETHR_RWMTX_W_FLG__) == 0
- && act & (ETHR_RWMTX_WAIT_FLGS__|ETHR_RWMTX_R_PEND_UNLCK_MASK__)) {
- /*
- * We either got waiters, or someone else trying
- * to read unlock which we might have to help.
- */
- rwmutex_try_complete_runlock(rwmtx, act, tse, 1, 1, 0);
- }
+ rwmutex_freqread_rdrs_dec_chk_wakeup(rwmtx, tse, act);
}
}
@@ -1542,12 +1561,16 @@ rwmutex_try_complete_runlock(ethr_rwmutex *rwmtx,
long act = initial;
int six, res, length;
+ ETHR_ASSERT((act & ETHR_RWMTX_W_FLG__) == 0);
+
+ if (act & ETHR_RWMTX_R_ABRT_UNLCK_FLG__)
+ return try_write_lock ? EBUSY : 0;
+
tse_tmp = tse;
if (!tse_tmp)
tse_tmp = ethr_get_ts_event();
- if ((act & ETHR_RWMTX_WAIT_FLGS__)
- && (act & ~ETHR_RWMTX_WAIT_FLGS__) == 0)
+ if ((act & ETHR_RWMTX_WAIT_FLGS__) && (act & ~ETHR_RWMTX_WAIT_FLGS__) == 0)
goto check_waiters;
if (rwmtx->type == ETHR_RWMUTEX_TYPE_FREQUENT_READ) {
@@ -1569,14 +1592,21 @@ rwmutex_try_complete_runlock(ethr_rwmutex *rwmtx,
if (check_before_try) {
res = check_readers_array(rwmtx, six, length);
+
+ ETHR_MEMORY_BARRIER;
+
if (res == EBUSY)
return try_write_lock ? EBUSY : 0;
}
+ restart:
+
while (1) {
long exp = act;
long new = act+1;
+ ETHR_ASSERT((act & ETHR_RWMTX_R_ABRT_UNLCK_FLG__) == 0);
+
ETHR_ASSERT((act & ETHR_RWMTX_R_PEND_UNLCK_MASK__)
< ETHR_RWMTX_R_PEND_UNLCK_MASK__);
@@ -1585,8 +1615,10 @@ rwmutex_try_complete_runlock(ethr_rwmutex *rwmtx,
act = new;
break;
}
+
if (!try_write_lock) {
- if (act == ETHR_RWMTX_W_FLG__ || act == 0)
+ if (act == 0 || (act & (ETHR_RWMTX_W_FLG__
+ | ETHR_RWMTX_R_ABRT_UNLCK_FLG__)))
return 0;
if ((act & ETHR_RWMTX_WAIT_FLGS__) == 0) {
if ((act & ETHR_RWMTX_R_FLG__) == 0)
@@ -1601,33 +1633,50 @@ rwmutex_try_complete_runlock(ethr_rwmutex *rwmtx,
else {
if (act == 0)
goto tryrwlock;
- if (act & (ETHR_RWMTX_W_FLG__|ETHR_RWMTX_WAIT_FLGS__))
+ if (act & (ETHR_RWMTX_W_FLG__
+ | ETHR_RWMTX_R_ABRT_UNLCK_FLG__))
return EBUSY;
}
}
res = check_readers_array(rwmtx, six, length);
- if (res == EBUSY) {
- act = ethr_atomic_dec_read(&rwmtx->mtxb.flgs);
- if (act & ETHR_RWMTX_R_MASK__)
- return try_write_lock ? EBUSY : 0;
- }
- else {
- while (1) {
- long exp = act;
- long new = act;
- new &= ~ETHR_RWMTX_R_FLG__;
- new--;
- ETHR_ASSERT(act & ETHR_RWMTX_R_PEND_UNLCK_MASK__);
+ ETHR_MEMORY_BARRIER;
- act = ethr_atomic_cmpxchg(&rwmtx->mtxb.flgs, new, exp);
- if (exp == act) {
- if (new & ETHR_RWMTX_R_PEND_UNLCK_MASK__)
- return try_write_lock ? EBUSY : 0;
- act = new;
- break;
+ ETHR_ASSERT((act & ETHR_RWMTX_W_FLG__) == 0);
+
+ while (1) {
+ int finished_abort = 0;
+ long exp = act;
+ long new = act;
+
+ new--;
+ if (act & ETHR_RWMTX_R_ABRT_UNLCK_FLG__) {
+ if ((new & ETHR_RWMTX_R_PEND_UNLCK_MASK__) == 0) {
+ new &= ~ETHR_RWMTX_R_ABRT_UNLCK_FLG__;
+ finished_abort = 1;
}
+ ETHR_ASSERT(act & ETHR_RWMTX_R_FLG__);
+ }
+ else if ((act & ETHR_RWMTX_R_FLG__) && res != EBUSY) {
+ new &= ~ETHR_RWMTX_R_FLG__;
+ }
+
+ ETHR_ASSERT(act & ETHR_RWMTX_R_PEND_UNLCK_MASK__);
+
+ act = ethr_atomic_cmpxchg(&rwmtx->mtxb.flgs, new, exp);
+ if (exp == act) {
+ act = new;
+ if (act & ETHR_RWMTX_W_FLG__)
+ return try_write_lock ? EBUSY : 0;
+ if (finished_abort && (act & ETHR_RWMTX_WAIT_FLGS__))
+ goto restart;
+ if (act & (ETHR_RWMTX_R_FLG__
+ | ETHR_RWMTX_R_ABRT_UNLCK_FLG__
+ | ETHR_RWMTX_R_PEND_UNLCK_MASK__))
+ return try_write_lock ? EBUSY : 0;
+ /* Read unlock completed */
+ break;
}
}
@@ -1637,12 +1686,9 @@ rwmutex_try_complete_runlock(ethr_rwmutex *rwmtx,
* to write lock it).
*/
- if (act & ETHR_RWMTX_W_FLG__)
- return try_write_lock ? EBUSY : 0;
-
if (act & ETHR_RWMTX_WAIT_FLGS__) {
check_waiters:
- rwmutex_unlock_wake(rwmtx, 0, act);
+ rwmutex_unlock_wake(rwmtx, 0, act, 0);
return try_write_lock ? EBUSY : 0;
}
@@ -1670,7 +1716,7 @@ rwmutex_incdec_restore_failed_tryrlock(ethr_rwmutex *rwmtx)
act = ethr_atomic_dec_read(&rwmtx->mtxb.flgs);
if ((act & ETHR_RWMTX_WAIT_FLGS__)
&& (act & ~ETHR_RWMTX_WAIT_FLGS__) == 0) {
- rwmutex_unlock_wake(rwmtx, 0, act);
+ rwmutex_unlock_wake(rwmtx, 0, act, 0);
}
}
@@ -1700,7 +1746,7 @@ rwmutex_normal_rlock_wait(ethr_rwmutex *rwmtx,
#endif
while (act & (ETHR_RWMTX_W_FLG__|ETHR_RWMTX_W_WAIT_FLG__)) {
- if (scnt >= 0) {
+ if (scnt <= 0) {
tse = ethr_get_ts_event();
if (update_spincount(&rwmtx->mtxb, tse, &start_scnt, &scnt)) {
event_wait(&rwmtx->mtxb, tse, scnt,
@@ -1736,10 +1782,83 @@ rwmutex_normal_rlock_wait(ethr_rwmutex *rwmtx,
static void
rwmutex_freqread_rlock_wait(ethr_rwmutex *rwmtx,
- ethr_ts_event *tse,
- long initial)
+ ethr_ts_event *tse);
+
+static int
+rwmutex_freqread_rlock(ethr_rwmutex *rwmtx, ethr_ts_event *tse, int trylock)
{
- long act = initial;
+ int res = 0;
+ long act;
+
+ rwmutex_freqread_rdrs_inc(rwmtx, tse);
+
+ ETHR_MEMORY_BARRIER;
+
+ act = ethr_atomic_read_acqb(&rwmtx->mtxb.flgs);
+
+ if (act != ETHR_RWMTX_R_FLG__) {
+ int wake_other_readers;
+
+ while (1) {
+ long exp, new;
+
+ wake_other_readers = 0;
+
+ if (act == 0)
+ new = act | ETHR_RWMTX_R_FLG__;
+ else if (act == ETHR_RWMTX_R_FLG__)
+ break; /* Got it */
+ else if (act & (ETHR_RWMTX_W_FLG__|ETHR_RWMTX_W_WAIT_FLG__)) {
+ rwmutex_freqread_restore_failed_tryrlock(rwmtx, tse);
+ if (trylock)
+ res = EBUSY;
+ else
+ rwmutex_freqread_rlock_wait(rwmtx, tse);
+ break;
+ }
+ else if (act & ETHR_RWMTX_R_ABRT_UNLCK_FLG__) {
+ if ((act & ETHR_RWMTX_R_FLG__) == 0)
+ ETHR_FATAL_ERROR__(EFAULT);
+ /*
+ * An aborted runlock, not write locked, and no write
+ * waiters, i.e., we got it...
+ */
+ if (act & ETHR_RWMTX_R_WAIT_FLG__)
+ wake_other_readers = 1;
+ break;
+ }
+ else {
+ new = act | ETHR_RWMTX_R_FLG__;
+ if (act & ETHR_RWMTX_R_PEND_UNLCK_MASK__) {
+ /*
+ * Someone is doing tryrwlock (no writer and no
+ * write waiters); we will try to abort that...
+ */
+ new |= ETHR_RWMTX_R_ABRT_UNLCK_FLG__;
+ }
+
+ if (act & ETHR_RWMTX_R_WAIT_FLG__)
+ wake_other_readers = 1;
+ }
+
+ exp = act;
+ act = ethr_atomic_cmpxchg_acqb(&rwmtx->mtxb.flgs, new, exp);
+ if (act == exp)
+ break;
+ }
+
+ if (wake_other_readers)
+ rwmutex_transfer_read_lock(rwmtx, act, 0);
+ }
+
+ return res;
+}
+
+static void
+rwmutex_freqread_rlock_wait(ethr_rwmutex *rwmtx,
+ ethr_ts_event *tse)
+{
+ long act;
int scnt, start_scnt;
int until_yield = ETHR_YIELD_AFTER_BUSY_LOOPS;
@@ -1752,12 +1871,10 @@ rwmutex_freqread_rlock_wait(ethr_rwmutex *rwmtx,
while (1) {
- rwmutex_freqread_restore_failed_tryrlock(rwmtx, tse);
-
act = ethr_atomic_read(&rwmtx->mtxb.flgs);
- while (act & ~(ETHR_RWMTX_R_FLG__|ETHR_RWMTX_R_WAIT_FLG__)) {
- if (scnt >= 0) {
+ while (act & (ETHR_RWMTX_W_FLG__|ETHR_RWMTX_W_WAIT_FLG__)) {
+ if (scnt <= 0) {
if (update_spincount(&rwmtx->mtxb, tse, &start_scnt, &scnt)) {
event_wait(&rwmtx->mtxb, tse, scnt,
ETHR_RWMTX_R_WAIT_FLG__, 1, 1);
@@ -1773,30 +1890,8 @@ rwmutex_freqread_rlock_wait(ethr_rwmutex *rwmtx,
scnt--;
}
- rwmutex_freqread_rdrs_inc(rwmtx, tse);
-
- ETHR_MEMORY_BARRIER;
-
- act = ethr_atomic_read(&rwmtx->mtxb.flgs);
-
- if (act == ETHR_RWMTX_R_FLG__)
- return; /* Got it */
-
- while (1) {
- long exp, new;
-
- if (act & ~(ETHR_RWMTX_R_FLG__|ETHR_RWMTX_R_WAIT_FLG__))
- break; /* Busy (need to restore inc) */
-
- if (act & ETHR_RWMTX_R_FLG__)
- return; /* Got it */
-
- exp = act;
- new = act | ETHR_RWMTX_R_FLG__;
- act = ethr_atomic_cmpxchg(&rwmtx->mtxb.flgs, new, exp);
- if (act == exp)
- return; /* Got it */
- }
+ if (rwmutex_freqread_rlock(rwmtx, tse, 1) != EBUSY)
+ break; /* Got it */
}
}
@@ -1816,14 +1911,23 @@ static ETHR_INLINE void
rwlock_wake_set_flags(ethr_rwmutex *rwmtx, long new_initial, int act_initial)
{
long act, act_mask;
+ int chk_abrt_flg;
+
+ ETHR_MEMORY_BARRIER;
+
if (rwmtx->type != ETHR_RWMUTEX_TYPE_NORMAL) {
/* r pend unlock mask may vary and must be retained */
act_mask = ETHR_RWMTX_R_PEND_UNLCK_MASK__;
+ if (new_initial & ETHR_RWMTX_R_FLG__)
+ chk_abrt_flg = 1;
+ else
+ chk_abrt_flg = 0;
}
else {
#ifdef ETHR_RLOCK_WITH_INC_DEC
/* rs mask may vary and must be retained */
act_mask = ETHR_RWMTX_RS_MASK__;
+ chk_abrt_flg = 0;
#else
/* rs mask always zero */
ETHR_ASSERT((act_initial & ETHR_RWMTX_RS_MASK__) == 0);
@@ -1836,6 +1940,8 @@ rwlock_wake_set_flags(ethr_rwmutex *rwmtx, long new_initial, int act_initial)
while (1) {
long exp = act;
long new = new_initial + (act & act_mask);
+ if (chk_abrt_flg && (act & act_mask))
+ new |= ETHR_RWMTX_R_ABRT_UNLCK_FLG__;
act = ethr_atomic_cmpxchg(&rwmtx->mtxb.flgs, new, exp);
if (act == exp)
break;
@@ -1883,6 +1989,14 @@ dbg_unlock_wake(ethr_rwmutex *rwmtx,
exp |= ETHR_RWMTX_R_WAIT_FLG__;
if (rwmtx->rq_end->next != rwmtx->mtxb.q)
exp |= ETHR_RWMTX_W_WAIT_FLG__;
+ else if (exp == ETHR_RWMTX_R_WAIT_FLG__) {
+ if (!have_w) {
+ if (rwmtx->type != ETHR_RWMUTEX_TYPE_NORMAL)
+ imask |= ETHR_RWMTX_R_FLG__;
+ else
+ imask |= ETHR_RWMTX_RS_MASK__;
+ }
+ }
act = ethr_atomic_read(&rwmtx->mtxb.flgs);
ETHR_ASSERT((exp & ~imask) == (act & ~imask));
@@ -1894,41 +2008,83 @@ dbg_unlock_wake(ethr_rwmutex *rwmtx,
#endif
static void
-rwmutex_unlock_wake(ethr_rwmutex *rwmtx, int have_w, long initial)
+rwmutex_transfer_read_lock(ethr_rwmutex *rwmtx, long initial, int q_locked)
+{
+ long act = initial;
+
+ if (!q_locked) {
+ ethr_ts_event *tse;
+ ETHR_ASSERT(initial & ETHR_RWMTX_R_WAIT_FLG__);
+ ETHR_ASSERT((initial & ETHR_RWMTX_W_FLG__) == 0);
+ ETHR_MTX_Q_LOCK(&rwmtx->mtxb.qlck);
+
+ act = ethr_atomic_read(&rwmtx->mtxb.flgs);
+ tse = rwmtx->mtxb.q;
+ if ((act & ETHR_RWMTX_W_FLG__) || !tse || is_w_waiter(tse)) {
+ /* Someone else woke the readers up... */
+ ETHR_MTX_Q_UNLOCK(&rwmtx->mtxb.qlck);
+ return;
+ }
+ }
+
+ rwmutex_unlock_wake(rwmtx, 0, initial, 1);
+}
+
+static void
+rwmutex_unlock_wake(ethr_rwmutex *rwmtx, int have_w, long initial,
+ int transfer_read_lock)
{
long new, act = initial;
ethr_ts_event *tse;
- if ((act & ETHR_RWMTX_WAIT_FLGS__) == 0) {
- if (!have_w)
- return;
- else {
- while ((act & ETHR_RWMTX_WAIT_FLGS__) == 0) {
- long exp = act;
- new = exp & ~ETHR_RWMTX_W_FLG__;
- act = ethr_atomic_cmpxchg(&rwmtx->mtxb.flgs, new, exp);
- if (act == exp)
- return;
+ if (transfer_read_lock) {
+ /*
+ * - Q already locked
+ * - Got R waiters first in Q
+ * - Not W locked
+ */
+ tse = rwmtx->mtxb.q;
+
+ ETHR_ASSERT(act & ETHR_RWMTX_R_WAIT_FLG__);
+ ETHR_ASSERT((act & (ETHR_RWMTX_W_FLG__)) == 0);
+ ETHR_ASSERT(tse && !is_w_waiter(tse));
+ }
+ else {
+
+ if ((act & ETHR_RWMTX_WAIT_FLGS__) == 0) {
+ if (!have_w)
+ return;
+ else {
+ while ((act & ETHR_RWMTX_WAIT_FLGS__) == 0) {
+ long exp = act;
+ new = exp & ~ETHR_RWMTX_W_FLG__;
+ act = ethr_atomic_cmpxchg(&rwmtx->mtxb.flgs, new, exp);
+ if (act == exp)
+ return;
+ }
}
}
- }
- ETHR_MTX_Q_LOCK(&rwmtx->mtxb.qlck);
- tse = rwmtx->mtxb.q;
+ ETHR_MTX_Q_LOCK(&rwmtx->mtxb.qlck);
+ tse = rwmtx->mtxb.q;
- if (!have_w) {
- if (!tse) {
+ if (!have_w) {
+ if (!tse) {
#ifdef ETHR_DEBUG
- act = ethr_atomic_read(&rwmtx->mtxb.flgs);
- ETHR_ASSERT((act & ETHR_RWMTX_WAIT_FLGS__) == 0);
+ act = ethr_atomic_read(&rwmtx->mtxb.flgs);
+ ETHR_ASSERT((act & ETHR_RWMTX_WAIT_FLGS__) == 0);
#endif
- goto already_served;
- }
- act = ethr_atomic_read(&rwmtx->mtxb.flgs);
- if (act & ~ETHR_RWMTX_WAIT_FLGS__) {
- already_served:
- ETHR_MTX_Q_UNLOCK(&rwmtx->mtxb.qlck);
- return;
+ goto already_served;
+ }
+ act = ethr_atomic_read(&rwmtx->mtxb.flgs);
+ if (act == (ETHR_RWMTX_R_WAIT_FLG__|ETHR_RWMTX_R_FLG__)) {
+ ETHR_ASSERT(tse && !is_w_waiter(tse));
+ }
+ else if (act & ~ETHR_RWMTX_WAIT_FLGS__) {
+ already_served:
+ ETHR_MTX_Q_UNLOCK(&rwmtx->mtxb.qlck);
+ return;
+ }
}
}
@@ -1988,6 +2144,7 @@ rwmutex_unlock_wake(ethr_rwmutex *rwmtx, int have_w, long initial)
rwmutex_freqread_rdrs_add(rwmtx, type, ix, wrs);
}
}
+
new = ETHR_RWMTX_R_FLG__;
}
@@ -1995,6 +2152,7 @@ rwmutex_unlock_wake(ethr_rwmutex *rwmtx, int have_w, long initial)
new |= ETHR_RWMTX_W_WAIT_FLG__;
rwlock_wake_set_flags(rwmtx, new, act);
+
wake_readers(rwmtx, rs);
}
}
@@ -2225,39 +2383,19 @@ ethr_rwmutex_tryrlock(ethr_rwmutex *rwmtx)
case ETHR_RWMUTEX_TYPE_FREQUENT_READ:
case ETHR_RWMUTEX_TYPE_EXTREMELY_FREQUENT_READ: {
ethr_ts_event *tse = ethr_get_ts_event();
-
- rwmutex_freqread_rdrs_inc(rwmtx, tse);
-
- ETHR_MEMORY_BARRIER;
-
- act = ethr_atomic_read_acqb(&rwmtx->mtxb.flgs);
-
- if (act != ETHR_RWMTX_R_FLG__) {
- while (1) {
- long exp, new;
-
- if (act & ~(ETHR_RWMTX_R_FLG__|ETHR_RWMTX_R_WAIT_FLG__)) {
- rwmutex_freqread_restore_failed_tryrlock(rwmtx, tse);
- res = EBUSY;
- break;
- }
-
- if (act & ETHR_RWMTX_R_FLG__)
- break;
-
- exp = act;
- new = act | ETHR_RWMTX_R_FLG__;
- act = ethr_atomic_cmpxchg_acqb(&rwmtx->mtxb.flgs, new, exp);
- if (act == exp)
- break;
- }
- }
-
+ res = rwmutex_freqread_rlock(rwmtx, tse, 1);
ethr_leave_ts_event(tse);
break;
}
}
+#ifdef ETHR_MTX_CHK_EXCL
+ if (res == 0) {
+ ETHR_MTX_CHK_EXCL_SET_NON_EXCL(&rwmtx->mtxb);
+ ETHR_MTX_CHK_EXCL_IS_NOT_EXCL(&rwmtx->mtxb);
+ }
+#endif
+
ETHR_MTX_HARD_DEBUG_LFS_TRYRLOCK(&rwmtx->mtxb, res);
ETHR_MTX_HARD_DEBUG_FENCE_CHK(rwmtx);
@@ -2286,9 +2424,8 @@ ethr_rwmutex_rlock(ethr_rwmutex *rwmtx)
while (1) {
act = ethr_atomic_cmpxchg_acqb(&rwmtx->mtxb.flgs, exp+1, exp);
- if (act == exp) {
+ if (act == exp)
break;
- }
if (act & (ETHR_RWMTX_W_FLG__|ETHR_RWMTX_W_WAIT_FLG__)) {
rwmutex_normal_rlock_wait(rwmtx, act);
@@ -2303,38 +2440,14 @@ ethr_rwmutex_rlock(ethr_rwmutex *rwmtx)
case ETHR_RWMUTEX_TYPE_FREQUENT_READ:
case ETHR_RWMUTEX_TYPE_EXTREMELY_FREQUENT_READ: {
ethr_ts_event *tse = ethr_get_ts_event();
-
- rwmutex_freqread_rdrs_inc(rwmtx, tse);
-
- ETHR_MEMORY_BARRIER;
-
- act = ethr_atomic_read_acqb(&rwmtx->mtxb.flgs);
-
- if (act != ETHR_RWMTX_R_FLG__) {
- while (1) {
- long exp, new;
-
- if (act & ~(ETHR_RWMTX_R_FLG__|ETHR_RWMTX_R_WAIT_FLG__)) {
- rwmutex_freqread_rlock_wait(rwmtx, tse, act);
- break;
- }
-
- if (act & ETHR_RWMTX_R_FLG__)
- break;
-
- exp = act;
- new = act | ETHR_RWMTX_R_FLG__;
- act = ethr_atomic_cmpxchg_acqb(&rwmtx->mtxb.flgs, new, exp);
- if (act == exp)
- break;
- }
- }
-
+ rwmutex_freqread_rlock(rwmtx, tse, 0);
ethr_leave_ts_event(tse);
break;
}
}
+ ETHR_MTX_CHK_EXCL_SET_NON_EXCL(&rwmtx->mtxb);
+ ETHR_MTX_CHK_EXCL_IS_NOT_EXCL(&rwmtx->mtxb);
ETHR_MTX_HARD_DEBUG_LFS_RLOCK(&rwmtx->mtxb);
ETHR_MTX_HARD_DEBUG_FENCE_CHK(rwmtx);
}
@@ -2344,6 +2457,8 @@ ethr_rwmutex_runlock(ethr_rwmutex *rwmtx)
{
long act;
+ ETHR_MTX_CHK_EXCL_IS_NOT_EXCL(&rwmtx->mtxb);
+ ETHR_MTX_CHK_EXCL_UNSET_NON_EXCL(&rwmtx->mtxb);
ETHR_ASSERT(!ethr_not_inited__);
ETHR_ASSERT(rwmtx);
ETHR_ASSERT(rwmtx->initialized == ETHR_RWMUTEX_INITIALIZED);
@@ -2357,7 +2472,7 @@ ethr_rwmutex_runlock(ethr_rwmutex *rwmtx)
if ((act & ETHR_RWMTX_WAIT_FLGS__)
&& (act & ~ETHR_RWMTX_WAIT_FLGS__) == 0) {
ETHR_ASSERT((act & ETHR_RWMTX_W_FLG__) == 0);
- rwmutex_unlock_wake(rwmtx, 0, act);
+ rwmutex_unlock_wake(rwmtx, 0, act, 0);
}
break;
@@ -2369,21 +2484,12 @@ ethr_rwmutex_runlock(ethr_rwmutex *rwmtx)
ETHR_ASSERT(act >= 0);
- ETHR_WRITE_MEMORY_BARRIER;
+ ETHR_MEMORY_BARRIER;
if (act == 0) {
-
-#ifndef ETHR_WRITE_MEMORY_BARRIER_IS_FULL
- ETHR_READ_MEMORY_BARRIER;
-#endif
act = ethr_atomic_read(&rwmtx->mtxb.flgs);
-
- if ((act & ETHR_RWMTX_W_FLG__) == 0
- && (act & (ETHR_RWMTX_WAIT_FLGS__
- | ETHR_RWMTX_R_PEND_UNLCK_MASK__))) {
- rwmutex_try_complete_runlock(rwmtx, act, tse, 1, 0, 0);
- }
-
+ if (act != ETHR_RWMTX_R_FLG__)
+ rwmutex_freqread_rdrs_dec_chk_wakeup(rwmtx, tse, act);
}
ethr_leave_ts_event(tse);
@@ -2422,25 +2528,31 @@ ethr_rwmutex_tryrwlock(ethr_rwmutex *rwmtx)
do {
- if (act & (ETHR_RWMTX_W_FLG__|ETHR_RWMTX_WAIT_FLGS__)) {
- res = EBUSY;
- break;
- }
-
- if (act & ETHR_RWMTX_R_MASK__) {
+ if (act == 0)
+ act = ethr_atomic_cmpxchg_acqb(&rwmtx->mtxb.flgs,
+ ETHR_RWMTX_W_FLG__, 0);
+ else if (act == ETHR_RWMTX_R_FLG__) {
res = rwmutex_try_complete_runlock(rwmtx, act, NULL,
0, 1, 1);
break;
}
-
- act = ethr_atomic_cmpxchg_acqb(&rwmtx->mtxb.flgs,
- ETHR_RWMTX_W_FLG__, 0);
+ else {
+ res = EBUSY;
+ break;
+ }
} while (act != 0);
break;
}
+#ifdef ETHR_MTX_CHK_EXCL
+ if (res == 0) {
+ ETHR_MTX_CHK_EXCL_SET_EXCL(&rwmtx->mtxb);
+ ETHR_MTX_CHK_EXCL_IS_NOT_NON_EXCL(&rwmtx->mtxb);
+ }
+#endif
+
ETHR_MTX_HARD_DEBUG_LFS_TRYRWLOCK(&rwmtx->mtxb, res);
ETHR_MTX_HARD_DEBUG_FENCE_CHK(rwmtx);
@@ -2485,6 +2597,8 @@ ethr_rwmutex_rwlock(ethr_rwmutex *rwmtx)
break;
}
+ ETHR_MTX_CHK_EXCL_SET_EXCL(&rwmtx->mtxb);
+ ETHR_MTX_CHK_EXCL_IS_NOT_NON_EXCL(&rwmtx->mtxb);
ETHR_MTX_HARD_DEBUG_LFS_RWLOCK(&rwmtx->mtxb);
ETHR_MTX_HARD_DEBUG_FENCE_CHK(rwmtx);
@@ -2501,12 +2615,15 @@ ethr_rwmutex_rwunlock(ethr_rwmutex *rwmtx)
ETHR_MTX_HARD_DEBUG_FENCE_CHK(rwmtx);
ETHR_MTX_HARD_DEBUG_LFS_RWUNLOCK(&rwmtx->mtxb);
+ ETHR_MTX_CHK_EXCL_IS_NOT_NON_EXCL(&rwmtx->mtxb);
+ ETHR_MTX_CHK_EXCL_UNSET_EXCL(&rwmtx->mtxb);
+
switch (rwmtx->type) {
case ETHR_RWMUTEX_TYPE_NORMAL:
act = ethr_atomic_cmpxchg_relb(&rwmtx->mtxb.flgs,
0, ETHR_RWMTX_W_FLG__);
if (act != ETHR_RWMTX_W_FLG__)
- rwmutex_unlock_wake(rwmtx, 1, act);
+ rwmutex_unlock_wake(rwmtx, 1, act, 0);
break;
case ETHR_RWMUTEX_TYPE_FREQUENT_READ:
@@ -2514,7 +2631,7 @@ ethr_rwmutex_rwunlock(ethr_rwmutex *rwmtx)
act = ethr_atomic_cmpxchg_relb(&rwmtx->mtxb.flgs, 0,
ETHR_RWMTX_W_FLG__);
if (act != ETHR_RWMTX_W_FLG__)
- rwmutex_unlock_wake(rwmtx, 1, act);
+ rwmutex_unlock_wake(rwmtx, 1, act, 0);
break;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-06 10:28:06 +0000