void
isrwlocked(Memblk *f, int iswr)
{
if(f->type != DBfile || f->mf == nil)
fatal("isrwlocked: not a file at pc %#p", getcallerpc(&f));
if((iswr && canrlock(f->mf)) || (!iswr && canwlock(f->mf)))
fatal("is%clocked at pc %#p", iswr?'w':'r', getcallerpc(&f));
}
/*
* f->source and f->msource must NOT be locked.
* fileMetaFlush locks the fileMeta and then the source (in fileMetaFlush2).
* We have to respect that ordering.
*/
static void
fileMetaLock(File *f)
{
if(f->up == nil)
fprint(2, "f->elem = %s\n", f->dir.elem);
assert(f->up != nil);
assert(!canwlock(&f->fs->elk));
wlock(&f->up->lk);
}
RWLock::~RWLock()
{
#if defined(__BEOS__) || defined(__HAIKU__)
// TODO
#elif defined(USE_LIBTASK)
ASSERT(canwlock(&m_rwlock));
#else
int r = pthread_rwlock_destroy(&m_rwlock);
ASSERT(r == 0);
#endif
}
static int
fileLock(File *f)
{
assert(!canwlock(&f->fs->elk));
wlock(&f->lk);
if(!chkSource(f)){
fileUnlock(f);
return 0;
}
return 1;
}
