int BufDaemon()
{
Buf* pBuf;
while(1)
{
semaLock(SEMA_IDX_DAEMON);
while( countFree() <= ((MAX_BUF_NUM / 10) * 3) )
{
pBuf = popLru();
removeHash(pBuf->blkno);
if( existDirty(pBuf->blkno) )
{
//write to device.
DevWriteBlock(pBuf->blkno, (char*)pBuf->pMem);
removeDirty(pBuf->blkno);
}
else
{
removeClean(pBuf->blkno);
}
free(pBuf->pMem);
memset(pBuf, 0, sizeof(Buf));
pBuf->pMem = malloc(BLOCK_SIZE);
pushFree(pBuf);
}
semaUnlock(SEMA_IDX_MAIN);
}
}
void BufInit(void)
{
int i = 0;
Buf* pBuf;
//init all list
for( i=0; i<HASH_TBL_SIZE; i++ )
{
ppHashHead[i] = NULL;
ppHashTail[i] = NULL;
}
for( i=0; i<3; i++ )
{
ppObjListHead[i] = NULL;
ppObjListTail[i] = NULL;
}
pLruListHead = NULL;
pLruListTail = NULL;
//create buffers
for( i=0; i<MAX_BUF_NUM; i++ )
{
pBuf = (Buf*)malloc(sizeof(Buf));
pBuf->pMem = malloc(BLOCK_SIZE);
pushFree(pBuf);
}
//init device
DevCreateDisk();
DevOpenDisk();
//init semaphore
semaInit();
semaLock(SEMA_IDX_MAIN);
semaLock(SEMA_IDX_DAEMON);
//init daemon
const int stack_size = 1024;
char* stack = (char*)malloc(stack_size);
memset(stack, 0, stack_size);
char* stack_top = stack + stack_size;
clone(BufDaemon, stack_top, CLONE_FS | CLONE_FILES | CLONE_SIGHAND | CLONE_VM, 0);
}
void node_free(node *n) {
nodemem -= sizeof(node);
nnodes -= 1;
n->type = FREE;
pushFree((stack *)n, (stack **)(&freelist));
}
void name_free(namestr *n) {
namemem -= sizeof(namestr);
nnames -= 1;
pushFree((stack *)n, (stack **)(&namefreelist));
}
void string_free(string *n) {
stringmem -= slen(n->s) + 1;
nstrings -= 1;
pushFree((stack *)n, (stack **)(&stringfreelist));
}
