Ignore:
Timestamp:
Oct 4, 2018, 11:16:13 PM (3 years ago)
Author:
alain
Message:

Complete restructuration of kernel spinlocks.

File:
1 edited

Legend:

Unmodified
Added
Removed
  • trunk/kernel/libk/remote_rwlock.c

    r457 r563  
    3131#include <remote_rwlock.h>
    3232
    33 ///////////////////////////////////////////
    34 void remote_rwlock_init( xptr_t lock_xp )
     33//////////////////////////////////////////////////////////////////////////////
     34//                Extern global variables
     35//////////////////////////////////////////////////////////////////////////////
     36
     37extern char * lock_type_str[];          // allocated in kernel_init.c
     38
     39
     40//////////////////////////////////////////
     41void remote_rwlock_init( xptr_t   lock_xp,
     42                         uint32_t type )
    3543{
    3644    remote_rwlock_t * lock_ptr = GET_PTR( lock_xp );
    3745    cxy_t             lock_cxy = GET_CXY( lock_xp );
    3846
    39     hal_remote_sw ( XPTR( lock_cxy , &lock_ptr->ticket )  , 0 );
    40     hal_remote_sw ( XPTR( lock_cxy , &lock_ptr->current ) , 0 );
    41     hal_remote_sw ( XPTR( lock_cxy , &lock_ptr->count )   , 0 );
    42 
    43 #if DEBUG_REMOTE_RWLOCKS
    44 hal_remote_swd( XPTR( lock_cxy , &lock_ptr->owner )   , XPTR_NULL );
    45 xlist_entry_init( XPTR( lock_cxy , &lock_ptr->list ) );
    46 #endif
    47 
    48 }
    49 
    50 //////////////////////////////////////////////
    51 void remote_rwlock_rd_lock( xptr_t lock_xp )
     47    hal_remote_s32 ( XPTR( lock_cxy , &lock_ptr->taken ) , 0 );
     48    hal_remote_s32 ( XPTR( lock_cxy , &lock_ptr->count ) , 0 );
     49
     50    xlist_root_init( XPTR( lock_cxy , &lock_ptr->rd_xroot ) );
     51    xlist_root_init( XPTR( lock_cxy , &lock_ptr->wr_xroot ) );
     52
     53    remote_busylock_init( XPTR( lock_cxy , &lock_ptr->lock ) , type );
     54}
     55
     56///////////////////////////////////////////////
     57void remote_rwlock_rd_acquire( xptr_t lock_xp )
    5258{
    53         reg_t      mode;
    54     uint32_t   ticket;
     59    thread_t * this = CURRENT_THREAD;
     60
     61    // check calling thread can yield
     62    thread_assert_can_yield( this , __FUNCTION__ );
    5563
    5664    // get cluster and local pointer on remote_rwlock
     
    5866    cxy_t             lock_cxy = GET_CXY( lock_xp );
    5967
    60     // get local pointer on local thread
    61     thread_t          * thread_ptr = CURRENT_THREAD;
    62 
    63     // extended pointers on ticket, current, count
    64     xptr_t              ticket_xp  = XPTR( lock_cxy   , &lock_ptr->ticket );
    65     xptr_t              current_xp = XPTR( lock_cxy   , &lock_ptr->current );
    66     xptr_t              count_xp   = XPTR( lock_cxy   , &lock_ptr->count );
    67 
    68     // disable interrupts
    69     hal_disable_irq( &mode );
    70 
    71     // get next free ticket
    72     ticket = hal_remote_atomic_add( ticket_xp , 1 );
    73 
    74     // busy waiting loop to take the lock
    75         while( ticket != hal_remote_lw( current_xp ) )
    76         {
    77         hal_fixed_delay( CONFIG_RWLOCK_DELAY );
    78         }
    79 
    80     ////////// From here we have the lock  ////////////
    81 
    82     // increment count
     68    // build useful extended pointers
     69    xptr_t busylock_xp = XPTR( lock_cxy , &lock_ptr->lock );
     70    xptr_t taken_xp    = XPTR( lock_cxy , &lock_ptr->taken );
     71    xptr_t count_xp    = XPTR( lock_cxy , &lock_ptr->count );
     72    xptr_t rd_root_xp  = XPTR( lock_cxy , &lock_ptr->rd_xroot );
     73
     74    // get busylock
     75    remote_busylock_acquire( busylock_xp );
     76
     77    // block and deschedule if lock taken
     78    while( hal_remote_l32( taken_xp ) )
     79    {
     80
     81#if DEBUG_RWLOCK
     82if( DEBUG_RWLOCK < (uint32_t)hal_get_cycles() )
     83{
     84    uint32_t   type = hal_remote_l32( XPTR( lock_cxy , &lock_ptr->lock.type ) );
     85    printk("\n[DBG] %s : thread %x (%s) READ BLOCK on rwlock %s [%x,%x] / cycle %d\n",
     86    __FUNCTION__, this->trdid, thread_type_str(this->type),
     87    lock_type_str[type], lock_cxy, lock_ptr, (uint32_t)hal_get_cycles() );
     88}
     89#endif
     90        // get pointer on calling thread
     91        thread_t * this = CURRENT_THREAD;
     92
     93        // register reader thread in waiting queue
     94        xlist_add_last( rd_root_xp , XPTR( local_cxy , &this->wait_xlist ) );
     95
     96        // block reader thread
     97        thread_block( XPTR( local_cxy , this ) , THREAD_BLOCKED_LOCK );
     98
     99        // release busylock
     100        remote_busylock_release( busylock_xp );
     101
     102        // deschedule
     103        sched_yield("reader wait remote_rwlock");
     104
     105        // get busylock
     106        remote_busylock_acquire( busylock_xp );
     107    }
     108
     109#if DEBUG_RWLOCK
     110if( DEBUG_RWLOCK < (uint32_t)hal_get_cycles() )
     111{
     112    uint32_t   type = hal_remote_l32( XPTR( lock_cxy , &lock_ptr->lock.type ) );
     113    printk("\n[DBG] %s : thread %x (%s) READ ACQUIRE on rwlock %s [%x,%x] / cycle %d\n",
     114    __FUNCTION__, this->trdid, thread_type_str(this->type),
     115    lock_type_str[type], lock_cxy, lock_ptr, (uint32_t)hal_get_cycles() );
     116}
     117#endif
     118
     119    // increment number of readers
    83120    hal_remote_atomic_add( count_xp , 1 );
    84121
    85     // increment thread.remote_locks
    86     thread_ptr->remote_locks++;
    87 
    88 #if DEBUG_REMOTE_RWLOCKS
    89 xlist_add_first( XPTR( local_cxy , &thread_ptr->xlocks_root ) ,
    90                  XPTR( lock_cxy ,  &lock_ptr->list ) );
    91 #endif
    92 
    93     // sync
    94     hal_fence();
    95 
    96     // release lock to allow several simultaneous readers
    97     hal_remote_atomic_add( current_xp , 1 );
    98 
    99     // enable interrupts
    100         hal_restore_irq( mode );
    101 
    102 }  // end remote_rwlock_rd_lock()
    103 
    104 ////////////////////////////////////////////////
    105 void remote_rwlock_rd_unlock( xptr_t lock_xp )
    106 {
    107         reg_t               mode;
     122    // release busylock
     123    remote_busylock_release( busylock_xp );
     124
     125}  // end remote_rwlock_rd_acquire()
     126
     127///////////////////////////////////////////////
     128void remote_rwlock_wr_acquire( xptr_t lock_xp )
     129{
     130    thread_t * this = CURRENT_THREAD;
     131
     132    // check calling thread can yield
     133    thread_assert_can_yield( this , __FUNCTION__ );
    108134
    109135    // get cluster and local pointer on remote_rwlock
     
    111137    cxy_t             lock_cxy = GET_CXY( lock_xp );
    112138
    113     // get cluster and local pointer on local thread
    114     thread_t          * thread_ptr = CURRENT_THREAD;
    115 
    116     // extended pointers on lock->count
    117     xptr_t              count_xp = XPTR( lock_cxy   , &lock_ptr->count );
    118 
    119     // disable interrupts
    120         hal_disable_irq( &mode );
    121  
    122     // decrement count
    123     hal_remote_atomic_add( count_xp , -1 );
    124 
    125     // decrement thread.remote_locks
    126         thread_ptr->remote_locks--;
    127 
    128 #if DEBUG_REMOTE_RWLOCKS
    129 xlist_unlink( XPTR( lock_cxy , &lock_ptr->list ) );
    130 #endif
    131 
    132     // enable interrupts
    133         hal_restore_irq( mode );
    134    
    135     // deschedule if pending request
    136     thread_check_sched();
    137 
    138 }  // end remote_rwlock_rd_unlock()
    139 
    140 //////////////////////////////////////////////
    141 void remote_rwlock_wr_lock( xptr_t lock_xp )
    142 {
    143         reg_t      mode;
    144     uint32_t   ticket;
     139    // build useful extended pointers
     140    xptr_t busylock_xp = XPTR( lock_cxy , &lock_ptr->lock );
     141    xptr_t taken_xp    = XPTR( lock_cxy , &lock_ptr->taken );
     142    xptr_t count_xp    = XPTR( lock_cxy , &lock_ptr->count );
     143    xptr_t wr_root_xp  = XPTR( lock_cxy , &lock_ptr->wr_xroot );
     144
     145    // get busylock
     146    remote_busylock_acquire( busylock_xp );
     147
     148    // block and deschedule if lock already taken or current readers
     149    while( hal_remote_l32( taken_xp ) || hal_remote_l32( count_xp ) )
     150    {
     151
     152#if DEBUG_RWLOCK
     153if( DEBUG_RWLOCK < (uint32_t)hal_get_cycles() )
     154{
     155    uint32_t   type = hal_remote_l32( XPTR( lock_cxy , &lock_ptr->lock.type ) );
     156    printk("\n[DBG] %s : thread %x (%s) WRITE BLOCK on rwlock %s [%x,%x] / cycle %d\n",
     157    __FUNCTION__, this->trdid, thread_type_str(this->type),
     158    lock_type_str[type], lock_cxy, lock_ptr, (uint32_t)hal_get_cycles() );
     159}
     160#endif
     161        // get local pointer on calling thread
     162        thread_t * this = CURRENT_THREAD;
     163
     164        // register writer thread in waiting queue
     165        xlist_add_last( wr_root_xp , XPTR( local_cxy , &this->wait_xlist ) );
     166
     167        // block writer thread
     168        thread_block( XPTR( local_cxy , this ) , THREAD_BLOCKED_LOCK );
     169
     170        // release busylock
     171        remote_busylock_release( busylock_xp );
     172
     173        // deschedule
     174        sched_yield("writer wait remote_rwlock");
     175
     176        // get busylock
     177        remote_busylock_acquire( busylock_xp );
     178    }
     179
     180#if DEBUG_RWLOCK
     181if( DEBUG_RWLOCK < (uint32_t)hal_get_cycles() )
     182{
     183    uint32_t   type = hal_remote_l32( XPTR( lock_cxy , &lock_ptr->lock.type ) );
     184    printk("\n[DBG] %s : thread %x (%s) WRITE ACQUIRE on rwlock %s [%x,%x] / cycle %d\n",
     185    __FUNCTION__, this->trdid, thread_type_str(this->type),
     186    lock_type_str[type], lock_cxy, lock_ptr, (uint32_t)hal_get_cycles() );
     187}
     188#endif
     189
     190    // take rwlock
     191    hal_remote_s32( taken_xp , 1 );
     192
     193    // release busylock
     194    remote_busylock_release( busylock_xp );
     195
     196}  // end remote_rwlock_wr_acquire()
     197
     198
     199///////////////////////////////////////////////
     200void remote_rwlock_rd_release( xptr_t lock_xp )
     201{
     202    // memory barrier before lock release
     203    hal_fence();
    145204
    146205    // get cluster and local pointer on remote_rwlock
     
    148207    cxy_t             lock_cxy = GET_CXY( lock_xp );
    149208
    150     // get local pointer on local thread
    151     thread_t          * thread_ptr = CURRENT_THREAD;
    152 
    153     // compute extended pointers on lock->ticket, lock->owner
    154     xptr_t              ticket_xp  = XPTR( lock_cxy   , &lock_ptr->ticket );
    155     xptr_t              count_xp   = XPTR( lock_cxy   , &lock_ptr->count );
    156     xptr_t              current_xp = XPTR( lock_cxy   , &lock_ptr->current );
    157 
    158     // disable interrupts
    159     hal_disable_irq( &mode );
    160 
    161     // get next free ticket
    162     ticket = hal_remote_atomic_add( ticket_xp , 1 );
    163 
    164     // loop to take the lock
    165         while( ticket != hal_remote_lw( current_xp ) )
    166         {
    167         hal_fixed_delay( CONFIG_RWLOCK_DELAY );
    168         }
    169 
    170     ////////// From here we have the lock  ////////////
    171 
    172     // wait completion of read accesses
    173     while( hal_remote_lw( count_xp ) != 0 )
    174     {
    175         hal_fixed_delay( CONFIG_RWLOCK_DELAY );
    176     }
    177 
    178 #if DEBUG_REMOTE_RWLOCKS
    179 hal_remote_swd( XPTR( lock_cxy  , &lock_ptr->owner ) ,
    180                 XPTR( local_cxy , thread_ptr ) );
    181 xlist_add_first( XPTR( local_cxy , &thread_ptr->xlocks_root ) ,
    182                  XPTR( lock_cxy  , &lock_ptr->list ) );
    183 #endif   
    184 
    185     // increment thread.remote_locks
    186     thread_ptr->remote_locks++;
    187 
    188     // enable interrupts
    189         hal_restore_irq( mode );
    190 
    191 }  // end remote_rwlock_wr_lock()
    192 
    193 //////////////////////////////////////////////
    194 void remote_rwlock_wr_unlock( xptr_t lock_xp )
    195 {
    196         reg_t               mode;
     209    // build useful extended pointers
     210    xptr_t busylock_xp = XPTR( lock_cxy , &lock_ptr->lock );
     211    xptr_t count_xp    = XPTR( lock_cxy , &lock_ptr->count );
     212    xptr_t rd_root_xp  = XPTR( lock_cxy , &lock_ptr->rd_xroot );
     213    xptr_t wr_root_xp  = XPTR( lock_cxy , &lock_ptr->wr_xroot );
     214
     215    // get busylock
     216    remote_busylock_acquire( busylock_xp );
     217
     218#if DEBUG_RWLOCK
     219if( DEBUG_RWLOCK < (uint32_t)hal_get_cycles() )
     220{
     221    thread_t * this = CURRENT_THREAD;
     222    uint32_t   type = hal_remote_l32( XPTR( lock_cxy , &lock_ptr->lock.type ) );
     223    printk("\n[DBG] %s : thread %x (%s) READ RELEASE on rwlock %s [%x,%x] / cycle %d\n",
     224    __FUNCTION__, this->trdid, thread_type_str(this->type),
     225    lock_type_str[type], lock_cxy, lock_ptr, (uint32_t)hal_get_cycles() );
     226}
     227#endif
     228
     229        // decrement number of readers
     230    hal_remote_atomic_add( count_xp , -1 );
     231
     232    // release first writer in waiting queue if no current readers
     233    // and writers waiting queue non empty
     234    if( (hal_remote_l32( count_xp ) == 0) && (xlist_is_empty( wr_root_xp ) == false) )
     235    {
     236        // get first writer thread
     237        xptr_t      thread_xp  = XLIST_FIRST( wr_root_xp , thread_t, wait_xlist );
     238        cxy_t       thread_cxy = GET_CXY( thread_xp );
     239        thread_t *  thread_ptr = GET_PTR( thread_xp );
     240
     241        // remove this waiting thread from waiting list
     242        xlist_unlink( XPTR( thread_cxy , &thread_ptr->wait_xlist ) );
     243
     244        // unblock this waiting thread
     245        thread_unblock( thread_xp , THREAD_BLOCKED_LOCK );
     246
     247#if DEBUG_RWLOCK
     248if( (uint32_t)hal_get_cycles() > DEBUG_RWLOCK )
     249{
     250    thread_t  * this        = CURRENT_THREAD;
     251    uint32_t    lock_type   = hal_remote_l32( XPTR( lock_cxy , &lock_ptr->lock.type ) );
     252    trdid_t     trdid       = hal_remote_l32( XPTR( thread_cxy , &thread_ptr->trdid ) );
     253    uint32_t    thread_type = hal_remote_lpt( XPTR( thread_cxy , &thread_ptr->type ) );
     254    printk("\n[DBG] %s : thread %x (%s) UNBLOCK thread %x (%s)"
     255    " / rwlock %s [%x,%x] / cycle %d\n",
     256    __FUNCTION__, this->trdid, thread_type_str(this->type), trdid, thread_type_str(thread_type),
     257    lock_type_str[lock_type], lock_cxy, lock_ptr, (uint32_t)hal_get_cycles() );
     258}
     259#endif
     260
     261    }
     262
     263    // release all readers in waiting queue if writers waiting queue empty
     264    // and readers waiting queue non empty
     265    else if( xlist_is_empty( wr_root_xp ) && (xlist_is_empty( rd_root_xp ) == false) )
     266    {
     267        while( xlist_is_empty( rd_root_xp ) == false )
     268        {
     269            // get first writer thread
     270            xptr_t      thread_xp  = XLIST_FIRST( wr_root_xp , thread_t, wait_xlist );
     271            cxy_t       thread_cxy = GET_CXY( thread_xp );
     272            thread_t *  thread_ptr = GET_PTR( thread_xp );
     273
     274            // remove this waiting thread from waiting list
     275            xlist_unlink( XPTR( thread_cxy , &thread_ptr->wait_xlist ) );
     276
     277            // unblock this waiting thread
     278            thread_unblock( thread_xp , THREAD_BLOCKED_LOCK );
     279
     280#if DEBUG_RWLOCK
     281if( (uint32_t)hal_get_cycles() > DEBUG_RWLOCK )
     282{
     283    thread_t  * this        = CURRENT_THREAD;
     284    uint32_t    lock_type   = hal_remote_l32( XPTR( lock_cxy , &lock_ptr->lock.type ) );
     285    trdid_t     trdid       = hal_remote_l32( XPTR( thread_cxy , &thread_ptr->trdid ) );
     286    uint32_t    thread_type = hal_remote_lpt( XPTR( thread_cxy , &thread_ptr->type ) );
     287    printk("\n[DBG] %s : thread %x (%s) UNBLOCK thread %x (%s)"
     288    " / rwlock %s [%x,%x] / cycle %d\n",
     289    __FUNCTION__, this->trdid, thread_type_str(this->type), trdid, thread_type_str(thread_type),
     290    lock_type_str[lock_type], lock_cxy, lock_ptr, (uint32_t)hal_get_cycles() );
     291}
     292#endif
     293
     294        }
     295    }
     296
     297    // release busylock
     298    remote_busylock_release( busylock_xp );
     299
     300}  // end remote_rwlock_rd_release()
     301
     302///////////////////////////////////////////////
     303void remote_rwlock_wr_release( xptr_t lock_xp )
     304{
     305    // memory barrier before lock release
     306    hal_fence();
    197307
    198308    // get cluster and local pointer on remote_rwlock
     
    200310    cxy_t             lock_cxy = GET_CXY( lock_xp );
    201311
    202     // get cluster and local pointer on local thread
    203     thread_t          * thread_ptr = CURRENT_THREAD;
    204 
    205     // compute extended pointer on lock->ticket
    206     xptr_t              current_xp = XPTR( lock_cxy   , &lock_ptr->current );
    207 
    208     // disable interrupts
    209         hal_disable_irq( &mode );
    210  
    211 #if CONFIG_LOCKS_OWNER
    212 hal_remote_swd( XPTR( lock_cxy , &lock_ptr->owner ) , XPTR_NULL );
    213 xlist_unlink( XPTR( lock_cxy , &lock_ptr->list ) );
    214 #endif
    215 
    216     // release lock
    217     hal_remote_atomic_add( current_xp , 1 );
    218 
    219     // decrement thread.remote_locks
    220         thread_ptr->remote_locks--;
    221 
    222     // enable interrupts
    223         hal_restore_irq( mode );
    224    
    225     // deschedule if pending request
    226     thread_check_sched();
    227 
    228 }  // end remote_rwlock_wr_unlock()
    229 
    230 ///////////////////////////////////////////
    231 void remote_rwlock_print( xptr_t   lock_xp,
    232                           char   * comment )
    233 {
    234     uint32_t     ticket;                // first free ticket index
    235     uint32_t     current;               // ticket index of current owner
    236     uint32_t     count;                 // current number of reader threads
    237 
    238     // get cluster and local pointer on remote_rwlock
    239     remote_rwlock_t * lock_ptr = GET_PTR( lock_xp );
    240     cxy_t             lock_cxy = GET_CXY( lock_xp );
    241 
    242     ticket  = hal_remote_lw ( XPTR( lock_cxy , &lock_ptr->ticket ) );
    243     current = hal_remote_lw ( XPTR( lock_cxy , &lock_ptr->current ) );
    244     count   = hal_remote_lw ( XPTR( lock_cxy , &lock_ptr->count ) );
    245 
    246     printk("\n*** rwlock <%l> %s : ticket = %d / current = %d / count = %d\n",
    247            lock_xp , comment , ticket , current , count );
    248 
    249 }  // end remote_rwlock_print()
    250 
     312    // build useful extended pointers
     313    xptr_t busylock_xp = XPTR( lock_cxy , &lock_ptr->lock );
     314    xptr_t taken_xp    = XPTR( lock_cxy , &lock_ptr->taken );
     315    xptr_t rd_root_xp  = XPTR( lock_cxy , &lock_ptr->rd_xroot );
     316    xptr_t wr_root_xp  = XPTR( lock_cxy , &lock_ptr->wr_xroot );
     317
     318    // get busylock
     319    remote_busylock_acquire( busylock_xp );
     320
     321#if DEBUG_RWLOCK
     322if( DEBUG_RWLOCK < (uint32_t)hal_get_cycles() )
     323{
     324    thread_t * this = CURRENT_THREAD;
     325    uint32_t   type = hal_remote_l32( XPTR( lock_cxy , &lock_ptr->lock.type ) );
     326    printk("\n[DBG] %s : thread %x (%s) WRITE RELEASE on rwlock %s [%x,%x] / cycle %d\n",
     327    __FUNCTION__, this->trdid, thread_type_str(this->type),
     328    lock_type_str[type], lock_cxy, lock_ptr, (uint32_t)hal_get_cycles() );
     329}
     330#endif
     331
     332    // release rwlock
     333    hal_remote_s32( taken_xp , 0 );
     334
     335    // unblock first waiting writer thread if writers waiting queue non empty
     336    if( xlist_is_empty( wr_root_xp ) == false )
     337    {
     338        // get first writer thread
     339        xptr_t      thread_xp  = XLIST_FIRST( wr_root_xp , thread_t, wait_xlist );
     340        cxy_t       thread_cxy = GET_CXY( thread_xp );
     341        thread_t *  thread_ptr = GET_PTR( thread_xp );
     342
     343        // remove this waiting thread from waiting list
     344        xlist_unlink( XPTR( thread_cxy , &thread_ptr->wait_xlist ) );
     345
     346        // unblock this waiting thread
     347        thread_unblock( thread_xp , THREAD_BLOCKED_LOCK );
     348
     349#if DEBUG_RWLOCK
     350if( (uint32_t)hal_get_cycles() > DEBUG_RWLOCK )
     351{
     352    thread_t  * this        = CURRENT_THREAD;
     353    uint32_t    lock_type   = hal_remote_l32( XPTR( lock_cxy , &lock_ptr->lock.type ) );
     354    trdid_t     trdid       = hal_remote_l32( XPTR( thread_cxy , &thread_ptr->trdid ) );
     355    uint32_t    thread_type = hal_remote_lpt( XPTR( thread_cxy , &thread_ptr->type ) );
     356    printk("\n[DBG] %s : thread %x (%s) UNBLOCK thread %x (%s)"
     357    " / rwlock %s [%x,%x] / cycle %d\n",
     358    __FUNCTION__, this->trdid, thread_type_str(this->type), trdid, thread_type_str(thread_type),
     359    lock_type_str[lock_type], lock_cxy, lock_ptr, (uint32_t)hal_get_cycles() );
     360}
     361#endif
     362
     363    }
     364
     365    // check readers waiting queue and unblock all if writers waiting queue empty
     366    else
     367    {
     368        while( xlist_is_empty( rd_root_xp ) == false )
     369        {
     370            // get first writer thread
     371            xptr_t      thread_xp  = XLIST_FIRST( rd_root_xp , thread_t, wait_xlist );
     372            cxy_t       thread_cxy = GET_CXY( thread_xp );
     373            thread_t *  thread_ptr = GET_PTR( thread_xp );
     374
     375            // remove this waiting thread from waiting list
     376            xlist_unlink( XPTR( thread_cxy , &thread_ptr->wait_xlist ) );
     377
     378            // unblock this waiting thread
     379            thread_unblock( thread_xp , THREAD_BLOCKED_LOCK );
     380
     381#if DEBUG_RWLOCK
     382if( (uint32_t)hal_get_cycles() > DEBUG_RWLOCK )
     383{
     384    thread_t  * this        = CURRENT_THREAD;
     385    uint32_t    lock_type   = hal_remote_l32( XPTR( lock_cxy , &lock_ptr->lock.type ) );
     386    trdid_t     trdid       = hal_remote_l32( XPTR( thread_cxy , &thread_ptr->trdid ) );
     387    uint32_t    thread_type = hal_remote_lpt( XPTR( thread_cxy , &thread_ptr->type ) );
     388    printk("\n[DBG] %s : thread %x (%s) UNBLOCK thread %x (%s)"
     389    " / rwlock %s [%x,%x] / cycle %d\n",
     390    __FUNCTION__, this->trdid, thread_type_str(this->type), trdid, thread_type_str(thread_type),
     391    lock_type_str[lock_type], lock_cxy, lock_ptr, (uint32_t)hal_get_cycles() );
     392}
     393#endif
     394
     395        }
     396    }
     397
     398    // release busylock
     399    remote_busylock_release( busylock_xp );
     400
     401}  // end remote_rwlock_wr_release()
     402
     403
     404
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