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RSlotStack.cxx
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1 // Author: Enrico Guiraud, Danilo Piparo CERN 03/2017
2 
3 /*************************************************************************
4  * Copyright (C) 1995-2018, Rene Brun and Fons Rademakers. *
5  * All rights reserved. *
6  * *
7  * For the licensing terms see $ROOTSYS/LICENSE. *
8  * For the list of contributors see $ROOTSYS/README/CREDITS. *
9  *************************************************************************/
10 
11 #include <ROOT/TSeq.hxx>
12 #include <ROOT/RDF/RSlotStack.hxx>
13 #include <TError.h> // R__ASSERT
14 
15 #include <mutex> // std::lock_guard
16 
17 ROOT::Internal::RDF::RSlotStack::RSlotStack(unsigned int size) : fSize(size)
18 {
19  for (auto i : ROOT::TSeqU(size))
20  fStack.push(i);
21 }
22 
24 {
25  std::lock_guard<ROOT::TSpinMutex> guard(fMutex);
26  R__ASSERT(fStack.size() < fSize && "Trying to put back a slot to a full stack!");
27  fStack.push(slot);
28 }
29 
31 {
32  std::lock_guard<ROOT::TSpinMutex> guard(fMutex);
33  R__ASSERT(!fStack.empty() && "Trying to pop a slot from an empty stack!");
34  const auto slot = fStack.top();
35  fStack.pop();
36  return slot;
37 }
void ReturnSlot(unsigned int slotNumber)
Definition: RSlotStack.cxx:23
#define R__ASSERT(e)
Definition: TError.h:96
A pseudo container class which is a generator of indices.
Definition: TSeq.hxx:66
std::stack< unsigned int > fStack
Definition: RSlotStack.hxx:29