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building up our threading tools: implement RW locks

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This commit is contained in:
Charles Kerr 2007-06-25 21:52:18 +00:00
parent 18cd986789
commit 6011450518
2 changed files with 153 additions and 9 deletions
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123
libtransmission/platform.c
View file

@ -212,12 +212,13 @@ static void ThreadFunc( void * _t )
tr_dbg( "Thread '%s' exited", t->name );
}
void tr_threadCreate( tr_thread_t * t, void (*func)(void *), void * arg,
char * name )
void tr_threadCreate( tr_thread_t * t,
void (*func)(void *), void * arg,
const char * name )
{
t->func = func;
t->arg = arg;
t->name = strdup( name );
t->name = tr_strdup( name );
#ifdef SYS_BEOS
t->thread = spawn_thread( (void *) ThreadFunc, name,
B_NORMAL_PRIORITY, t );
@ -231,7 +232,7 @@ const tr_thread_t THREAD_EMPTY = { NULL, NULL, NULL, 0 };
void tr_threadJoin( tr_thread_t * t )
{
if (t->func != NULL)
if( t->func != NULL )
{
#ifdef SYS_BEOS
long exit;
@ -264,6 +265,15 @@ void tr_lockClose( tr_lock_t * l )
#endif
}
int tr_lockTryLock( tr_lock_t * l )
{
#ifdef SYS_BEOS
#error how is this done in beos
#else
return pthread_mutex_trylock( l );
#endif
}
void tr_lockLock( tr_lock_t * l )
{
#ifdef SYS_BEOS
@ -323,6 +333,14 @@ void tr_condSignal( tr_cond_t * c )
pthread_cond_signal( c );
#endif
}
void tr_condBroadcast( tr_cond_t * c )
{
#ifdef SYS_BEOS
#error how is this done in beos
#else
pthread_cond_broadcast( c );
#endif
}
void tr_condClose( tr_cond_t * c )
{
@ -702,3 +720,100 @@ tr_getDefaultRoute( struct in_addr * addr UNUSED )
}
#endif
/***
****
***/
static void
tr_rwSignal( tr_rwlock_t * rw )
{
if ( rw->wantToWrite )
tr_condSignal( &rw->writeCond );
else if ( rw->wantToRead )
tr_condBroadcast( &rw->readCond );
}
void
tr_rwInit ( tr_rwlock_t * rw )
{
memset( rw, 0, sizeof(tr_rwlock_t) );
tr_lockInit( &rw->lock );
tr_condInit( &rw->readCond );
tr_condInit( &rw->writeCond );
}
void
tr_rwReaderLock( tr_rwlock_t * rw )
{
tr_lockLock( &rw->lock );
rw->wantToRead++;
while( rw->haveWriter || rw->wantToWrite )
tr_condWait( &rw->readCond, &rw->lock );
rw->wantToRead--;
rw->readCount++;
tr_lockUnlock( &rw->lock );
}
int
tr_rwReaderTrylock( tr_rwlock_t * rw )
{
int ret = FALSE;
tr_lockLock( &rw->lock );
if ( !rw->haveWriter && !rw->wantToWrite ) {
rw->readCount++;
ret = TRUE;
}
tr_lockUnlock( &rw->lock );
return ret;
}
void
tr_rwReaderUnlock( tr_rwlock_t * rw )
{
tr_lockLock( &rw->lock );
--rw->readCount;
if( !rw->readCount )
tr_rwSignal( rw );
tr_lockUnlock( &rw->lock );
}
void
tr_rwWriterLock( tr_rwlock_t * rw )
{
tr_lockLock( &rw->lock );
rw->wantToWrite++;
while( rw->haveWriter || rw->readCount )
tr_condWait( &rw->writeCond, &rw->lock );
rw->wantToWrite--;
rw->haveWriter = TRUE;
tr_lockUnlock( &rw->lock );
}
int
tr_rwWriterTrylock( tr_rwlock_t * rw )
{
int ret = FALSE;
tr_lockLock( &rw->lock );
if( !rw->haveWriter && !rw->readCount )
ret = rw->haveWriter = TRUE;
tr_lockUnlock( &rw->lock );
return ret;
}
void
tr_rwWriterUnlock( tr_rwlock_t * rw )
{
tr_lockLock( &rw->lock );
rw->haveWriter = FALSE;
tr_rwSignal( rw );
tr_lockUnlock( &rw->lock );
}
void
tr_rwClose( tr_rwlock_t * rw )
{
tr_condClose( &rw->writeCond );
tr_condClose( &rw->readCond );
tr_lockClose( &rw->lock );
}

39
libtransmission/platform.h
View file

@ -55,17 +55,46 @@ const char * tr_getTorrentsDirectory( void );
const tr_thread_t THREAD_EMPTY;
void tr_threadCreate ( tr_thread_t *, void (*func)(void *),
void * arg, char * name );
void * arg, const char * name );
void tr_threadJoin ( tr_thread_t * );
void tr_lockInit ( tr_lock_t * );
void tr_lockClose ( tr_lock_t * );
int tr_lockTryLock ( tr_lock_t * );
void tr_lockLock ( tr_lock_t * );
void tr_lockUnlock ( tr_lock_t * );
void tr_condInit ( tr_cond_t * );
void tr_condWait ( tr_cond_t *, tr_lock_t * );
void tr_condSignal ( tr_cond_t * );
void tr_condClose ( tr_cond_t * );
void tr_condInit ( tr_cond_t * );
void tr_condSignal ( tr_cond_t * );
void tr_condBroadcast ( tr_cond_t * );
void tr_condClose ( tr_cond_t * );
void tr_condWait ( tr_cond_t *, tr_lock_t * );
/***
**** RW lock:
**** The lock can be had by one writer or any number of readers.
***/
typedef struct tr_rwlock_s
{
tr_lock_t lock;
tr_cond_t readCond;
tr_cond_t writeCond;
size_t readCount;
size_t wantToRead;
size_t wantToWrite;
int haveWriter;
}
tr_rwlock_t;
void tr_rwInit ( tr_rwlock_t * );
void tr_rwClose ( tr_rwlock_t * );
void tr_rwReaderLock ( tr_rwlock_t * );
int tr_rwReaderTrylock ( tr_rwlock_t * );
void tr_rwReaderUnlock ( tr_rwlock_t * );
void tr_rwWriterLock ( tr_rwlock_t * );
int tr_rwWriterTrylock ( tr_rwlock_t * );
void tr_rwWriterUnlock ( tr_rwlock_t * );
struct in_addr; /* forward declaration to calm gcc down */
int