public static LockRequest ForAcquire(LockMode mode, ref DbEntry obj)
{
LockRequest lr =
new LockRequest(LockOperation.Acquire, mode, 0, ref obj, new Lock());
return(lr);
}
public static LockRequest ForTimeout()
{
LockRequest lr = new LockRequest();
lr.op = LockOperation.Timeout;
return(lr);
}
public static LockRequest ForReleaseAll()
{
LockRequest lr = new LockRequest();
lr.op = LockOperation.ReleaseAll;
return(lr);
}
public static LockRequest ForAcquireWithTimeout(LockMode mode, int timeout, ref DbEntry obj)
{
LockRequest lr =
new LockRequest(LockOperation.AcquireTimeout, mode, timeout, ref obj, new Lock());
return(lr);
}
public static LockRequest ForReleaseObj(ref DbEntry obj)
{
LockRequest lr = new LockRequest();
lr.op = LockOperation.ReleaseObj;
lr.obj = obj;
return(lr);
}
public static LockRequest ForRelease(Lock lck)
{
LockRequest lr = new LockRequest();
lr.op = LockOperation.Release;
lr.lck = lck;
return(lr);
}
public static LockRequest ForReleaseObj(ref DbEntry obj) {
LockRequest lr = new LockRequest();
lr.op = LockOperation.ReleaseObj;
lr.obj = obj;
return lr;
}
public static LockRequest ForTimeout() {
LockRequest lr = new LockRequest();
lr.op = LockOperation.Timeout;
return lr;
}
public static LockRequest ForReleaseAll() {
LockRequest lr = new LockRequest();
lr.op = LockOperation.ReleaseAll;
return lr;
}
public static LockRequest ForRelease(Lock lck) {
LockRequest lr = new LockRequest();
lr.op = LockOperation.Release;
lr.lck = lck;
return lr;
}
public static LockRequest ForAcquireWithTimeout(LockMode mode, int timeout, ref DbEntry obj) {
LockRequest lr =
new LockRequest(LockOperation.AcquireTimeout, mode, timeout, ref obj, new Lock());
return lr;
}
public static LockRequest ForAcquire(LockMode mode, ref DbEntry obj) {
LockRequest lr =
new LockRequest(LockOperation.Acquire, mode, 0, ref obj, new Lock());
return lr;
}
public void LockVector(int locker, LockFlags flags, LockRequest[] list) {
DbRetVal ret;
int failedIndx;
// allocate the arguments we need to pass
DBT* objs = stackalloc DBT[list.Length];
DB_LOCKREQ* lockReqs = stackalloc DB_LOCKREQ[list.Length];
// calculate object buffer size and allocate on stack
int objSize = 0;
for (int indx = 0; indx < list.Length; indx++)
objSize += list[indx].Obj.Size;
byte* objBuf = stackalloc byte[objSize];
// configure all DB_LOCKREQ instances
DBT* currObjp = objs;
byte* currObjBuf = objBuf;
for (int indx = 0; indx < list.Length; indx++) {
lockReqs[indx] = list[indx].PrepareLockReq(currObjp, ref currObjBuf);
currObjp++;
}
// perform call into BDB
lock (rscLock) {
DB_ENV* evp = CheckDisposed();
DB_LOCKREQ* lastp;
ret = evp->LockVector(evp, unchecked((uint)locker), unchecked((UInt32)flags),
lockReqs, list.Length, out lastp);
if (ret != DbRetVal.SUCCESS)
failedIndx = (int)(lastp - lockReqs);
else
failedIndx = list.Length;
}
// assign the acquired locks back to the initial LockRequest instances
for (int indx = 0; indx < failedIndx; indx++) {
LockOperation op = list[indx].Op;
if (op == LockOperation.Acquire || op == LockOperation.AcquireTimeout)
list[indx].lck = new Lock(lockReqs[indx].dblock);
}
if (ret != DbRetVal.SUCCESS)
ThrowLockException(ret, failedIndx);
}
